Hosted by the Freshwater Biological Association, the Riverfly Partnership represents a network of organisations whose aims are to protect the water quality of our rivers, further the understanding of riverfly populations and actively conserve riverfly habitats. This is achieved via a range of ongoing projects which utilise citizen scientists to monitor invertebrates, water chemistry, physical habitat, pollution and hydromorphological functioning in order to gain a picture of overall river health.
Ben Fitch is the national project manager for the Anglers’ Riverfly Monitoring Initiative, one of the projects run by the Riverfly Partnership. This week we chatted to him about the Partnership and their projects, the importance of riverflies and how Covid-19 has affected his working life over the recent months.
If one were to canvas general public opinion about flies, many people would likely think of those which they consider to be pests, such as house flies, mosquitos, greenfly, blackfly and horseflies. How would you explain to a non-specialist how important riverflies are and why we should care about them?
First of all, I would say that all insects are essential to life on this planet, with species fulfilling important roles within ecosystems – even those ‘pesky’ flies as some may see them.
Next, I would highlight the fact that freshwater is a precious natural resource upon which all life on Earth depends. Humans are certainly no exception to that rule, but it is because of us that freshwater is under considerable and continuous threat.
I would go on to explain that riverflies contain three groups of insects, namely mayflies, caddisflies, and stoneflies. More than 280 species of riverflies have been recorded in the UK, most of which spend the greater part of their life beneath the surface of still or running freshwater as larvae, before emerging from the water as winged adults. Riverflies should be present in running and still freshwater bodies across the UK throughout the year, they are at the heart of freshwater ecosystems and are a vital link in the aquatic food chain as a food source for fish and birds.
Importantly, riverflies are sensitive to changes in water quality, for example chemical or organic pollution, which makes them excellent indicators of the health of a freshwater body (they are often referred to as the canaries of our rivers). Thus, by monitoring them regularly, it is possible to identify and manage pollution issues, deter would-be polluters, and protect our freshwater ecosystems.
Does Britain have any endemic or particularly rare riverflies?
There are eight rare and threatened riverfly species that have been designated as conservation priorities by the UK Government. The eight species, listed as follows, are categorised as being of Principal Importance:
Northern February red (Brachyptera putata): a stonefly that occurs only in Britain. It is found mainly in Scottish upland streams.
Rare medium stonefly (Isogenus nubecula): only known to occur in the Welsh River Dee and may now be extinct.
Scarce grey flag (Hydropsyche bulgaromanorum): a large caddisfly only known from stony areas on the River Arun in Sussex.
Scarce brown sedge (Ironoquia dubia): a caddisfly only known from three southern English sites. There are no recent records for this species.
Small grey sedge (Glossosoma intermedium) a caddisfly that has been found in only four Lake District streams. There are no recent records for this species.
Window-winged sedge (Hagenella clathrata) an orange mottled caddisfly that lives in pools on bogs and heathland at about ten sites in the UK.
Southern iron blue (Baetis niger): a widespread mayfly species whose abundance appears to have declined in some areas by as much as 80% in recent decades.
Yellow mayfly (Potamanthus luteus): an attractive, bright yellow mayfly that is found mainly on the River Wye in the Welsh borders.
[I would like to give great thanks to Craig Macadam, Conservation Director at Buglife – The Invertebrate Conservation Trust, for permitting me to use information from the Buglife website in parts of this interview, particularly above. To find out more about why bugs are essential to our planet and all life on it, visit: https://www.buglife.org.uk].
The Riverfly Partnership coordinates a number of projects looking at lots of different measurements of river health. These include surveying invertebrates, physical habitat, hydromorphological features and pollution events. What happens to the data that is collected in these projects? Who uses it and what for?
Firstly, I should clarify that the Riverfly Partnership (RP) is hosted by the Freshwater Biological Association and is a network of more than 100 partner organisations representing anglers, conservationists, entomologists, scientists, water course managers, and relevant authorities. RP carries out work according to its core aims: to protect the water quality of our rivers, to further the understanding of riverfly populations, and to conserve riverfly habitats.
As your question states, RP is involved in a number of citizen science freshwater monitoring initiatives. Here is a summary of those initiatives along with how data is collected, stored, and used in each case:
Anglers’ Riverfly Monitoring Initiative (ARMI)
The Anglers’ Riverfly Monitoring Initiative (ARMI) is a project that enables trained volunteers, such as anglers and conservationists, to protect river water quality by regularly monitoring eight pollution sensitive aquatic invertebrate groups. Data is recorded in the field before being uploaded to the national online ARMI database (once checked and verified, ARMI data is available under the terms of the Open Government Licence). ARMI complements the work carried out by statutory agency staff across the UK, such as the Environment Agency in England, primarily by reporting pollution incidents to and sharing ARMI data with those agencies directly.
Urban Riverfly
Urban Riverfly includes an additional six aquatic invertebrate groups to the eight used in the original ARMI scheme and can be used across a number of different river systems, but especially modified rivers and those influenced by conurbations. Urban Riverfly data is recorded in the field by trained citizen scientists, hosted locally through Riverfly Hubs, and used by Catchment Partnerships to inform catchment management and direct conservation action.
Extended Riverfly
Extended Riverfly uses 33 invertebrate groups, including the eight ARMI groups, to provide a more nuanced picture of river water quality according to different stressors. Extended Riverfly data is collected, stored, and used similarly to that of Urban Riverfly.
Freshwater Watch
Hosted by the Earthwatch Institute, Freshwater Watch is a global initiative for monitoring water quality and water chemistry. Data is recorded in the field and submitted online by trained citizen scientists, after which experts provide analysis and feedback to monitors and present evidence to decision- and policy-makers worldwide.
MoRPh
The Modular River Survey, or MoRPh, enables citizen scientists and professionals to be trained to assess and record physical habitat and hydromorphological functioning in their local rivers and streams. Data is hosted online by Cartographer and is used by Catchment Partnerships to inform catchment management and direct conservation action.
Outfall Safari
The Outfall Safari is a citizen science method devised to systematically survey outfalls in urban rivers in order to identify pollution and notify the relevant authorities (sharing data accordingly). It was created by the Citizen Crane project team in partnership with staff from Thames Water and the Environment Agency, and is regarded by the Environment Agency as best practice.
SmartRivers
SmartRivers, hosted by Salmon & Trout Conservation (S&TC), takes citizen science invertebrate monitoring to the highest resolution. Species data are recorded in the field then stored in S&TC’s database. S&TC staff process SmartRivers data through their unique calculator and provide data analysis that identifies specific water quality stressors in the river and pinpoints where they are occurring. S&TC use SmartRivers data to provide evidence that can help prevent pollution occurring in the first place. This evidence can also inform how to concentrate management efforts locally to achieve the best environmental outcomes.
Like many people across the UK, you have been furloughed as a result of the global Covid-19 coronavirus pandemic since March 2020, so are not legally permitted to work. As such, we are grateful to you for agreeing to do this interview in a voluntary capacity. Can you describe your role within the Riverfly Partnership and what a typical work day looks like for you?
My working role for the Riverfly Partnership is as the national project manager of the Anglers’ Riverfly Monitoring Initiative (ARMI). The Riverfly Partnership receives funding support for the role from the Environment Agency (rod licence revenue and the Water Environment Improvement Fund). I have also been a committed and active ARMI volunteer monitor since 2009.
At the moment, I would not describe my days as ‘typical’ for the reasons outlined in your question. I have not been able to work since late March, neither has it been possible to carry out ARMI sampling for the larger part of the same period. I am grateful, however, for the excellent ongoing support provided by the Freshwater Biological Association and I hope to be able to return to work in the near future, as soon as government advice permits and once it is deemed safe for me to do so. In the meantime, I have greatly enjoyed spending more time with my family which has largely centred around home educating our two children whilst my wife, as a key worker, has continued to work throughout.
A typical day prior to the current situation was always incredibly busy! My key responsibilities revolve around supporting and expand the ARMI network, including communications, publications, presentations, training delivery, tutor support, tutor/training workshop observations and QA, tutor development, database and website management, and much, much more. I wouldn’t feel right at this point if I didn’t thank every single ARMI volunteer, participant, partner, and supporter for their incredible commitment towards protecting our rivers. I would also like to acknowledge my colleagues Alex Domenge, Steve Brooks, Bill Brierley, Roger Handford, Lesley Hadwin, Kirsty Hadwin, Paul Knight, Nick Measham, Tom Miles, along with every RP Board member, every Extended / Urban Riverfly Working Group member, and every contact at the Environment Agency, Scottish Environment Protection Agency, Natural Resources Wales, and Northern Ireland Environment Agency. As you can see the work that I am involved in has partnership at its core.
If people want to get involved with riverfly monitoring (or any of your citizen science projects) how would you suggest they get started? Do they need prior knowledge/experience of freshwater sampling or species ID?
Volunteering, as a river monitor or riverfly recorder, is not only an excellent way to protect the health of your local river, but also to contribute towards direct conservation action, local communities, scientific data and evidence, and sustainability.
New volunteers are always welcome and no prior knowledge or experience is necessary.
Individuals interested in becoming a volunteer Riverfly monitor should register their interest with their local Riverfly hub coordinator. To find out who that is please use the contact us page on the Riverfly Partnership website: https://www.riverflies.org
Individuals interested in becoming a riverfly recorder should visit the Riverfly Recording Schemes (RRS) page of the Riverfly Partnership website: https://www.riverflies.org/Recording_Schemes where details about the schemes and RRS coordinator contact information can be found.
Organisations interested in joining the Anglers’ Riverfly Monitoring Initiative (ARMI) must have a member who is prepared to act as a local coordinator (to serve as a contact point between the EA / SEPA / NRW / NIEA and the monitoring group) and have members attend an official ARMI workshop. The workshop includes presentations, practical demonstrations and active participation. For more information please contact us via the Riverfly Partnership website: https://www.riverflies.org
For information about freshwater invertebrate and freshwater ecology training courses, I can highly recommend the Freshwater Biological Association: https://www.fba.org.uk
What conservation actions or changes would you like to see happen in your lifetime that would have a significant (and positive) impact on river health and biodiversity?
I could list many here but I am going to go with two, off the bat:
Serious, long term political commitment to the natural world and conservation thereof
Wilding
If you had to tell people to google a photo of one species of riverfly which would you choose? (perhaps because it is ecologically important or just because it looks interesting!)
If I had to choose one, it would be of a flat-bodied mayfly larva (species Ecdyonurus dispar – Autumn Dun) because new volunteers often remark that it looks like an alien! If that stirs your curiosity, type ‘Ecdyonurus dispar’ in to your internet search engine of choice. If you can find an image of the white spot variant that is particularly striking.
I would also like to share this beautiful image, simply named ‘Mayfly’, photographed by Jon Hawkins. This was the winning entry to the most recent RP Photography Competition and I think it deserves to be seen! (Reproduced with kind permission of the Riverfly Partnership, copyright Jon Hawkins.)
Image credits:
(a) Mayfly by Johan J.Ingles-Le Nobel via Flickr (CC BY-ND 2.0)
(b) Caddisfly by Magnus Hagdorn via Flickr (CC BY-SA 2.0)
(c) River Exe by Adrian Scottow via Flickr (CC BY-SA 2.0)
The BAR-LT is a bioacoustic recorder manufactured by Frontier Labs. The recorder is designed to be deployed in the field over extended periods and can be programmed to record for set times. This type of acoustic recorder is ideal for monitoring bird song, frog calls, or even wolves. This kind of monitoring is often referred to as passive acoustic monitoring (PAM) and is becoming increasingly popular in biodiversity studies across the globe. Not only are these growing libraries of soundscapes important for current research and survey, but they also provide invaluable references for future research into both global and local scale biodiversity change.
The BAR-LT is a professional two-channel audio recorder designed specifically for long-term autonomous field deployments. It comes in a waterproof, lockable enclosure made from tough UV resistant plastic. It has space for four SD cards, each with up to 512GB storage capacity, meaning vast amounts of data can be recorded over one deployment. It is powered by 1-6 rechargeable 18650 batteries, providing 100-600 hours of recording time, and can also be powered using an external 6V or 12V power input. There are two microphone configuration options available: Standard (two-channels; one mic pointing left, one pointing downwards) and Left/Right. The omnidirectional microphones are highly sensitive and ultra-low noise, producing clear, crisp recordings.
We took the standard BAR-LT out to the field to record the dawn chorus.
How We Tested
We loaded the BAR-LT with a single memory card and four rechargeable 18650 batteries. We set a simple sunrise-based schedule, asking the recorder to record from an hour before sunrise to an hour after. The recorder then did the rest, using its in-built GPS to determine where in the world we were and therefore what time the sunrise was, basing start and stop times on this. We took the recorder to a nearby spot of woodland and fixed it to a tree using the included strap and a python cable lock (available separately) looped through the metal mounting plate at the back of the recorder.
What We Found
Although we could have left the BAR-LT out for an extended period of time, we only left it out for a single night on this occasion. When we collected it, the two-hour recording had successfully been completed, with minimal battery or memory drain. Upon listening to the dawn chorus, the audio was wonderfully clear, and the microphones were very sensitive. Some examples of audio and sonograms are below.
Our Opinion
The BAR-LT was very simple to set up and, although the scheduling capabilities are powerful, the settings are logical and easy to navigate. The battery life and memory capacity were outstanding, making the unit a really great piece of kit for any long-term deployments or for use in very remote locations where access is infrequent. We were also particularly impressed with the handy battery removal tool that came with the kit – it saved a lot of time fiddling with the batteries and also demonstrated how well-thought-out the kit is. The only part of the design that we weren’t so keen on was the metal backplate for mounting the unit, which is slightly larger than the unit itself and doesn’t have any grip teeth like most trail cameras do. The tree we were mounting the unit to was relatively small, meaning the backplate got in the way a bit, and only just fit a python padlock after a bit of a squeeze.
The recordings that the BAR-LT produced provided a wonderful soundscape and we were impressed with the quality of the recordings. There was very little ‘noise’ and the clarity of the recordings was evident, both when listening to the audio and when viewing the sonogram. The microphones picked up the sounds of the road surprisingly well, even though we thought we were far enough away to exclude them, demonstrating their impressive sensitivity.
We feel that the BAR-LT would be a great detector for conservationists and researchers who are looking to capture soundscapes for both current and future research. It performed well for bird song, but we think it would be equally as valuable to those wishing to record any terrestrial call. If you are interested in recording aquatic or low-frequency calls with the BAR-LT, please get in touch with us on customer.services@nhbs.com.
To view our full range of sound recorders and microphones, visit www.nhbs.com. If you have any questions on wildlife recording or would like some advice on the microphone for you then please contact us via email at customer.services@nhbs.com or phone on 01803 865913
Amid the enduring difficulties of the COVID-19 pandemic, it has been heartening to see the resourcefulness, resilience and imagination shown by the naturalist community. To give a taste of this, we asked our British Wildlife contributors how they had spent their time through late March and April, when restrictions were at their tightest. Here we give you the delightfully varied responses that came back. I hope that readers enjoy this snapshot of life in lockdown for the naturalist.
A spectacular spring
The start of lockdown coincided with a most exceptional run of fine spring weather (April was duly confirmed by the Met Office as the sunniest since 1921). While it was somewhat torturous to watch this unfold from the confines of our homes, time outdoors was all the more invigorating for it and the usual spring arrivals and emergences were met with even greater joy than normal.
A number of our regulars have tracked the changes as spring progressed, and Simon Leach has been encouraging local recorders to do the same: ‘I’ve been recording first flowerings since 2008 in the Taunton area, replicating (sort of) a similar exercise undertaken by Walter Watson in the first half of the twentieth century. And this year, constrained by “lockdown”, it seemed like a good idea to “widen the net” to get others in Somerset recording first flowering dates as well.’ By late May more than 35 participants had been drawn to the cause, and their recording from the height of lockdown through to the time of writing, in late May, has highlighted an extraordinarily early spring: Common Dog-violet Viola riviniana, Greater Butterfly-orchid Platanthera chlorantha and Biting Stonecrop Sedum acre, for example, have all had their earliest first flowering dates since Simon started the initiative.
Spring seemed to arrive early farther north, too, as Michael Scott notes: ‘Lockdown in the northwest Highlands is not too different from normal life here, but with few tourists and without the incessant afternoon hum from the rush hours of transatlantic jets. April 17th was a red-letter day. As I ate breakfast, I spotted the first Swallow of the year. Going outside, I heard the first Cuckoo from the adjacent hill. Later, a distinctive off-key scolding from the coastal bay below the house told us that the Common Sandpipers were back, too. They were respectively one, four and two days earlier than we recorded last year, but I suspect that may just reflect more observer effort!’
And it was not just summer migrants and wildflowers that were making early appearances, but also spring invertebrates. David Christie, copy checker for BW, noted the following from his home in Southampton: ‘Among the highlights were the garden’s earliest ever Dark-edged Bee-fly, on 16th March, a pleasant sunny day which also produced a Comma, a Small Tortoiseshell and two Brimstones. On 26th, an astonishing addition was a single male Wood White, unsurprisingly the first ever for the garden — but some 6 weeks too early! I imagine that this, the daintiest of the whites, was bred and released by somebody nearby (several people have released butterflies in the area in previous years). In April Orange-tips became the commonest butterfly, and on 16th of that month a Red-tailed Bumblebee, supposedly a common species but a garden first, turned up; it stayed for several days but had apparently disappeared by the middle of the following week.’
Peter Marren has enjoyed tracking changes on his local patch in Ramsbury, Wiltshire: ‘The sunniest side of this enforced lockdown is that I have come to appreciate home turf as never before. It helps that this has been the brightest, if not the warmest, April for some time, but this year the beauty of the meadows, woods and downs around Ramsbury has made me gasp, as if seeing it for the first time. I watched while a late spring turned into an early one. Frog spawn, flocculent and chilly, appeared in the ditch outside during the first week in March, and by the second week in April the tadpoles were already well grown. I heard the first Chiffchaff, much later than usual, on March 18th. It was joined in song by a Blackcap by March 25th. I heard the first Willow Warbler on April 5th (they are still doing well here, and have spread from the valley scrub into a belt of trees below the down, planted 15 years ago). The first Orange-tip fluttered into my garden on 9th April. The first singing Reed Warbler began –like a cold engine warming up – on the 10th, I spotted the first Swallow on the 13th and heard a solitary Cuckoo calling from the reedbed on Easter Sunday, 12th April. There was a close tie-in this year with the opening of our two cuckoo flowers, Lady’s Smock Cardamine pratensis and Lords-and-Ladies Arum maculatum. I should perhaps mention that spring usually comes late to Ramsbury. We are in a narrow east-west valley where a cold westerly blows from the Marlborough Downs and puts everything back by about a week.
‘Apart from the perennially exciting arrival of our summer visitors, I find I am looking at the small, easily overlooked things in life. This year I watched the leaves unfurl. Ash has, for once, tied with oak (so perhaps we are in for neither a splash nor a soak). Its feathery leaves push upwards in a shuttlecock from a bush of spent flowers, then angle out stiffly on their long petioles. By contrast, the leaves of oak curl softly from their buds, masked by a screen of yellow-green catkins. For a day or two, the hedgerow oaks take on an almost autumnal hue before they turn spring-green, that delicate, tender green that lifts the heart and makes you feel young again (anyone know any good oak songs?). Baby oak leaves lack the bitter tannins that build up later on. I nibble some straight from the branch – green chewing gum. Isolation makes you do strange things.
‘I’m also looking at bees. The only way I can get close to a bee is with close-up binoculars. Where banks face the sun, and especially when they are sheltered by a hedge, the mining bees are busy, locating their little, barely visible excavations, and vanishing into them bearing heavy loads of bright yellow pollen. Much of it, I note, is taken from Leylandii cones (so let’s hear it for once for that much-maligned conifer). Watching the bees at work are a whole host of parasites. On 31st March there was a brief flurry of oil beetles. Later on, nomad bees and blood bees were swarming about, each intent on laying a single egg inside the mining bee’s chamber. Patrolling bee-flies will do the same. The proper bees do not seem to notice that they are surrounded by malevolent cuckoos. Imagine a troop of hostile visitors raiding your cupboards and your fridge, sleeping in your bed, chasing away the kids. And that’s before the insecticides get you. I am glad I am not a bee. I am glad I live in Ramsbury. The swamp may be muddy yet – for the valley has taken a long time to recover from February’s floods – but it is full of life. Nature is the perfect antidote to despair in this surreal, locked-down spring.’
A number of correspondents noted what an excellent spring it has been for invertebrates, and bees in particular seem to have been popular with those wishing to use their time in lockdown to get to grips with a new group. From Anglesey, James Robertson writes: ‘I sit on a low wall, dangling my legs. After a while a queen Garden Bumblebee heads into a gap at the base of the wall by my feet. I am learning the skill my ornithologist brother tried to teach me many years ago. Then I was having none of it. Plants sat around on their bottoms, I had to search them out, keep on the move. But this year everything is different. Be still and the insects come to you. As so often, the constraints we are under force us to be creative, to learn new tricks and look at the world afresh.
‘As the dominant hominid falls silent, nature booms and buzzes. The exceptional weather puts on a display of insect variety. Wasp Beetles bounce around my garden, flicking their antennae and not looking quite right for the wasps they pretend to be. Red Mason Bees investigate holes in concrete posts and Joanna’s Bee Hotel, a future bee smorgasbord for hungry Blue Tits. She has quickly mastered the identification of Early, Garden, Red-tailed and Buff-tailed Bumblebees.
‘My car windscreen is splattered with insect bodies. This is supposed to be a memory, how it was when we were children. Is this explosion of life a sign of what would happen if we stilled the great machine of our industrious world?’
It was not the abundance of bees but a single unexpected one that provided a highlight for our copy editor, David Hawkins: ‘I was delighted when a rather smart solitary bee appeared in my flat in Bristol, having blundered in through the window. I consulted Falk & Lewington at length, but was perplexed – trying my damnedest to make it an Andrena of some sort, although none of the candidates looked quite right. Plus it had very beautiful mottled dark blue-grey eyes. Then, using a hand lens, I caught sight of a small spike on the underside of the first sternite – this, apparently, is diagnostic of a male Spined Mason Bee Osmia spinulosa. It seemed very curious to encounter it in the middle of the city, but we live near a railway line and some allotments so there may well be suitable habitats there. Most interestingly, as with some other Osmia spp., it nests inside vacant snail shells.’
While lockdown may have produced a new generation of bee enthusiasts, it was perhaps not such a good time to pick up an interest in flies. Alan Stubbs reports that his garden ‘is almost bereft of hoverflies; yesterday I achieved the fourth species for the March–April period and I have never seen more than two of any on a lap of the garden. Flies as a whole are very sparse even now (23rd April), a shame in the lockdown. The current drought does not help, but there is a legacy effect from low populations and drought last year. The excessive winter rains have not been of benefit (and have possibly been a negative factor). Currently it is difficult to know how widespread the doldrums extend, but I suspect areas that have had more rain over the last four to six weeks will have fared a bit better. Reports from London and Warwickshire suggest I am not alone.’
Bringing wildlife to you
While opportunities to go out into the wider countryside were limited, many found ways to bring wildlife to their doorsteps instead. Moth-trapping has seen a surge in popularity, as Paul Waring explains: ‘Moth-trap operators are better placed than many wildlife enthusiasts to cope with lockdown arrangements. Most of us routinely operate a light-trap in our gardens, and some do so on verandas and roof-tops if they have no garden. With a light-trap the moths come to us, from the garden itself, and from beyond it, so we do not need to leave our home to record what is about. The numbers and variety of moths in the catch and the seasonal patterns of occurrence always hold some interest, even in inner city locations. One is sometimes amazed at what turns up. Facebook has been full of people reporting their garden catches, often including photos of the moths, sometimes with lively discussion, throughout the lockdown period.’
The staff at Butterfly Conservation, unable to get out into the field, have also focused on moths in their gardens. Mark Parsons tells of some early highlights: ‘During lockdown the conservation staff at Butterfly Conservation were encouraged to run a moth trap at their homes. At least 28 staff participated, with traps being run from Devon to Cambridgeshire and north to Deeside, as well as in Northern Ireland. Although there were a few cool evenings in the first three weeks, generally conditions were relatively mild and very suitable, and as a result there were a lot of interesting observations. Of the scarcer species there were records of Silver Cloud Egira conspicillaris (Worcestershire), Small Eggar Eriogaster lanestris (Dorset), Marbled Pug Eupithecia irriguata (Devon) and the micro-moth Mompha divisella (Dorset and Glamorgan), with a Light Orange Underwing Boudinotiana notha (Surrey) being seen by day. Other interesting records included high counts of Lunar Marbled Brown Drymonia ruficornis (56) and Frosted Green Polyploca ridens (31), both on 11th April in Surrey. It really is amazing what can be found in gardens!’
BW’s Founding Editor, Andrew Branson, has been making good use of other technologies to monitor goings-on in his garden: ‘So often when we are observing the natural world we are looking at it from a very narrow perspective both in time and in space. We return to our favourite haunts looking for confirmation of the same species – the anxious scanning for returning migrants is a classic expression of this. I am always struck by the way we have a mental search pattern that reinforces what we expect to see. A classic is the way botanists with their stooping gaze on the ground will often fail to record unusual tree species right above them. In lockdown I have been trying to extend my appreciation of garden species by using a webcam to record nocturnal life. I’m lucky enough to have a garden that reaches down to a river, and have been discovering that not only do we have the expected Brown Rats, Mallards and Moorhens making regular nightly visits, but our garden also seems to be on the rounds of an Otter, an American Mink (not so welcome), Hedgehogs (first I’ve seen in the garden for years), Roe Deer, Foxes and Rabbits. Recently, the webcam captured a furtive pair of Tawny Owls having a midnight bath in the river!’
Dave Wilkinson has spent time studying some of the more obscure lifeforms in his pond: ‘Lockdown natural history: in the imagination it is snow leopards and camels as I read George Schaller’s new book Into wild Mongolia, while in reality it’s restricted to the garden and occasional short walks. In February we had a new garden pond dug, with the first water plants going in just before lockdown. With few ponds nearby it quickly attracted birds, hedgehogs and wasps; to drink, wash, or forage along the edge. Water beetles, pond skaters and water boatmen quickly followed. New ponds tend to be prone to algal blooms and ours is no exception. The torrential rains of February washed surrounding soil into the newly dug pond, adding nutrients, then the warm sunny weather of April powered algal photosynthesis – the pond first scummed with ‘blanket weed’, then turned bright green with cyanobacteria and other algae. Without lab access (no plankton net or centrifuge) some ingenuity allowed me to concentrate some plankton to view with a rather basic 50-year-old microscope. With such equipment colonial cyanobacteria – such as Aphanocaspa – were easier to isolate than smaller cells. The floating ‘blanket weed’ quickly vanished, but small patches of filamentous algae are in the shallows, including the green alga Stigeoclanium. Under the microscope these threads have the look of cells-within-cells, with small round green structures within the longer tubular cells. These structures are chloroplasts, the site of photosynthesis with the product stored as starch, staining dark when I added iodine. Back in the depths of geological time these chloroplasts evolved from free-living cyanobacteria; down my microscope I am seeing the history of our emerald planet encapsulated in the green scum of a garden pond.’
And in the terrestrial realm, Roy Watling has also been looking at some smaller organisms in his garden in Edinburgh: ‘Some years previously, when I was recovering from a medical procedure, I had to make time for exercise. I walked around the streets close to my house, gradually increasing the distance each day; I could not resist the temptation to “mycologise” though and began to list all the micro-fungi found on the vascular plant cultivars I saw in each garden. Now I am confined to my own garden because of lockdown I decided to conduct a similar survey, with surprising (to me at least) results. Thus, the tips of shoots of Irish Tutsan Hypericum pseudohenryi hosted the mildew Erysiphe hyperici, which is not uncommon on our native plants, while hidden among the erect branches of the snowberry Symphoriocarps x doorenbosii was another mildew, E. symphoricarpi. These two species are not rare but are poorly recorded in Scotland, and certainly neither has previously been recorded here on these hosts. The true mould Ampelomyces quisqualis, a parasite of a range of mildews, is equally under-recorded, although can be obvious to the keen observer. Also evident in my border was blotching on the shrub Hebe x francisciana: a rather distressing sight caused by the fungus Septoria exotica. On the north facing side of the house where it is moist and shaded, Chaetothyrium babingtonii grows prolifically in a mixed planting of various Rhododendron cultivars and hybrids. This fungus is common and widespread under the right conditions, and although it does not appear to harm the plants it looks very unsightly – thank heavens it only occurs on Rhododendron!’
Frances Dipper has been observing the interactions between some more familiar species: ‘The human brain is much better than a computer algorithm at picking out patterns (hence ‘Galaxy Zoo’ – the web-based project that uses citizen scientists to classify distant galaxies based on their shape) so changing from recording fish (and other marine life) to birds and garden wildlife is proving to be a fascinating experience during lockdown. Seashore recording and diving are time-limited, but looking out at a habitat resource (i.e. the bird feeders in my large, wildlife-friendly garden) is not. As a marine biologist learning to be an ornithologist, here are some recent observations. Some Greenfinch Carduelis chloris prefer to spray out sunflower hearts from the feeder and then eat at their leisure on the ground below – memories of rich arable field pickings? Much smaller Goldfinch Carduelis carduelis will hold their ground (perch) on the feeder in the face of Greenfinch bully tactics. Starling Sturnus vulgaris are now adept at clinging on to feeders – perhaps our Cambridge ones are fast learners. Great Tit Parus major will nest in vertical holes, in this case a hollow brick column. There is also a Magpie Pica pica nest in our oak tree. A faithful Spotted Flycatcher Muscicapa striata pair used to nest every year in the same vine until a Magpie raided its nest a few years ago. The best sighting to date? Not a bird but a Grass Snake Natrix natrix swimming across the pond and obviously unaware that Great Crested Newt Triturus cristatus is a protected species! Now how did one of the latter get into my downstairs shower room?’
And the extra time at home allowed Michael Scott the chance to notice garden visitors who might have gone undetected in a normal year: ‘Freedom from urgent deadlines has meant more time to observe how regularly a pair of Yellowhammers come to join the Dunnocks and an occasional fat Bank Vole feeding on the grain that ungrateful Chaffinches and House Sparrows regularly scatter onto the ground from our bird feeders. A small group of Long-tailed Tits in early April was a first for the garden. One was collecting the frayed ends of some garden string, presumably for a nest somewhere in the area.’
David Christie noted some apparent effects of the lockdown itself on the birds in his garden: ‘Perhaps the most notable feature of April–May was that many birds were becoming unusually tame. When I was “tidying” a corner of the garden, an adult female Blackbird walked around my feet, picking up odd items of food; feeding within a few centimetres of my feet, she occasionally looked up at me to check what I was doing! The visiting Stock Doves, too, were tamer than usual. On 24th April, a pair of Blackcaps had begun nest-building just a metre from our back window; although several Blackcaps regularly spend January–April in the area, they have never before nested here (sadly, the pair deserted at the laying stage). By the end of the month, a Blackbird pair with three fledglings showed no fear of humans, nor did a fully independent young Robin.’
And Hugh Raven similarly has been musing on the possible effects of lockdown on the wildlife of his local loch and beyond: ‘Float over the deep belly of our local sealoch and look north, and you spy two rivers as they reach the sea – in plan like the outstretched arms of a mermaid’s purse. Embraced by these limbs is a verdant turf of saltmarsh fringed by a pancake of sandy mud, twice daily exposed when the tide recedes. At this time of year, it’s the haunt of sawbills. Goosanders and mergansers are by nature shy and flighty, but this year they are abundant. With human traffic around the loch and up these rivers – never heavy – a fraction of the norm, having eaten their fill they laze about on foreshore and saltmarsh preening in the spring sunshine. I counted 18 one day in late April. Sawbills are good at fishing. Research from Norway reports “adult goosander on average eat from 310 to 500g fish a day”. At this time of year they’re enjoying the feeding opportunities presented by the smolt run – that evolutionary miracle that sees juvenile salmon pour downstream as maturity, light and temperature tell them to reset their osmotic meter, leave fresh water and start to fatten up in their marine phase.
‘Salmon smolts weigh some 20g, so if they are the main source of food, each duck may eat twenty or more a day. Thousands will disappear down their gullets. The local river is noted for the freshwater pearl mussel – which depends on migratory salmonids to survive. You can get a licence to shoot sawbills, but there’s no appetite for that here. Salmon and pearl mussels, or these beautiful sleek and shiny ducks? Such are the dilemmas of conservation.’
Natural history online
The lockdown experience would surely have been very different had it happened in the not-so-distant past. Social media, and the online world in general, has changed our hobby and helped naturalists to stay connected throughout this period (see Brett Westwood’s column in this issue for more on this topic). Members of the birding community, for example, have been enjoying the rapid sharing of news, and a healthy element of competition, while working on their ‘lockdown lists’.
Dawn Balmer reports: ‘The movements of the released White-tailed Eagles from the Isle of Wight have been well tracked by the birdwatchers fortunate enough to spot them flying over their gardens (see https://bit.ly/2X5YXlK). I’ve also been amazed how many people have recorded Osprey over their garden, too! Both species seemed to have avoided airspace over our garden, though we were lucky enough to see two Cranes circling overhead on 20th May.
‘The first few nights of April saw a large passage of Common Scoters overland. While not a new phenomenon, it has never been documented so well. Birders stood in gardens and listened in the dark, others set recorders to record overnight – see https://bit.ly/3e5ejhj for a summary. Personally, we sat outside in our garden in Thetford (Norfolk) on the nights of 1st and 2nd April and heard Teal and Wigeon on the 1st, and Wigeon again on the 2nd. We’ve since added Moorhen to our house list – heard one fly over calling at 3.45am, and Dunlin, which flew over calling at 10.30pm one evening! With a bit more time on people’s hands, more have taken up “nocturnal migration” recording.’
Adrian Knowleshas been monitoring the Facebook pages of the Essex Field Club, which has produced some notable records through lockdown: ‘Rob Smith posted a picture of the fly Bibio venosus from his daily walk patch, Headley Common in south Essex. Apparently there are only two other records in Essex, both in the north of the county. He has also recorded the mining bee Andrena cineraria from the same site – this species remains a scarce in Essex. There were two records of the ladybird Rhyzobius forestieri, a recent colonist of the UK, including one in someone’s garden. Then, on 10th April, Ed Hardy grabbed a load of wood chip during his morning walk with a view to identifying contents during his lockdown time. His finds included the beetle Rugilus angustatus, which is rare in the county, with a lack of recent records.’
Martin Harvey, David Roy and Helen Roy offer some insight into the effect of lockdown on submissions to iRecord, the online biological recording system maintained by the Biological Records Centre (part of the UK Centre for Ecology & Hydrology): ‘April 2020 proved to be a busy month with over 100,000 records added, up from about 75,000 in April 2019. It’s hard to know how much of this increase is the result of people taking up wildlife recording as an activity while locked down close to home, and how much is due to the combination of overall growth in records arriving at iRecord and the sunny weather that many experienced during April. But there do seem to be some changes in the patterns within these records. Not all biological records state the habitat that they were recorded in, but for those that do there has been a clear shift, with the proportion of records assigned to gardens more or less doubling, and a big fall in the number of records assigned to “wilder” habitats such as woodlands and grasslands. The most frequently recorded species during the month have been typical garden visitors, including butterflies such as Orange-tip and Peacock, the Dark-edged Bee-fly, Hebrew Character moth and Buff-tailed Bumblebee.’
‘Records arriving in iRecord are checked and verified by expert naturalists on behalf of the national recording schemes. An impressive three-fold increase in verification during April 2020 compared to the previous year is testament to the dedication of these people, and no doubt also demonstrates they have been making good use of the time that might have been spent in the field during a different year.
‘What effect these changes will have on the total pool of records available for 2020 remains to be seen, but it will be exciting to consider the ways in which these records can contribute to the long-term analyses that BRC and the recording schemes collaborate on. In the meantime, we hope that as many people as possible have been able to find ways of connecting with nature during these unprecedented circumstances.’
The lockdown has provided an excellent opportunity to fill in gaps in distribution maps and monitor species on the move by encouraging the submission of records. Butterfly Conservation, for example, is asking the public to report on butterflies seen in their gardens, as Caroline Bulman explains: ‘Understanding the changes in patterns of emergence and distribution across the UK is vital to improving our understanding of the impacts of climate change on butterflies and other native wildlife. Wherever you live your observations are even more vital this year and particularly those in northern England and in Scotland, where you can record novel information of species which are spreading northwards, in response to a changing climate. For example, in mid-April we had a report of the most northerly Comma ever recorded in Britain, found in Caithness on the north coast of Scotland! If you’d like to get involved go to https://bit.ly/3bM1gQk to register and download a free smartphone app, or sign up to record butterflies in your garden, on your PC or laptop at https://bit.ly/2WOQ40M where you can also read the results from 2019.’
Paul Waring used the daily exercise walks to further the understanding of moth populations in his local area: ‘During lockdown we have taken the opportunity of beating for caterpillars to start recording the colonisation by moths of a hedgerow of various native broadleaf trees newly planted to screen from view a field of solar panels. We have also carried our pheromone lure for Emperor moths Saturnia pavonia with us every day to see if the large “white hole” for this species shown just south of The Wash in the newly published Atlas of Britain and Ireland’s Larger Moths reflects lack of recording or a genuine absence. Thus far it appears the Emperor really is absent, although this is certainly not the case for many other moth species for which there is a similar white hole.’
For some groups, recording need not be limited to our time outside the house either. Geoff Oxford writes: ‘The British Arachnological Society, working with Jordan Cuff (Cardiff University), has launched two “lockdown” spider surveys that can be completed around the house and garden. One is to record the species, numbers and locations of the three British cellar spiders –the very common Daddy-long-legs Spider Pholcus phalangioides, the much less common Wine Cellar Spider Psilochorus simoni and the rare Marbled Cellar Spider Holocnemus pluchei. The second, newly launched, is to record when clusters of Garden Spider Araneus diadematus spiderlings are first noticed. Details of both surveys can be found on Twitter @BASSurveys and at britishspiders.org.uk. Response so far to the first survey has been good with some 50 people counting a total of over 185 cellar spiders, some in previously unrecorded hectads.
‘The lockdown has not seen arachnologists locking away their equipment. Initiated by Richard Wilson and Chris Cathrine, naturalists nationwide have taken to surveying their garden lawns in a two-minute sample using modified garden blow-vacs. Early results include a new spider for Yorkshire, Cryptachaea blattea. The survey has led to informed discussion via Twitter @britishspiders and #lockdownsuckschallenge, creating a forum for promoting more widely spider biodiversity in gardens. Lockdown has seen an unprecedented surge in interest in arachnids more generally; we have been inundated on Twitter.’
Lichenologists, too, have been getting better acquainted with their home patches, with some excellent results – Sandy Coppins reports: ‘Lichens lend themselves to “local looking” perhaps more than several other wildlife groups. BLS Twitter suggested recording lichens on your doorstep, window sill or garden, etc. But after your initial ten lichens seen on your patio slabs, where to go next? Heather Paul, in Forres, says “I amused my neighbour by going down on my knees on the pavement outside to look at Lecanora muralis which of course I have never recorded here.” While in North Wales, Dave Lamacraft on a gentle potter to look at some nearby trees, “with a view to better learning some common things in ‘normal habitats’ for a change”, was surprised to find Ramalina lacera almost straight away swiftly followed by Schismatomma graphidioides – both pretty rare in Wales!
‘But perhaps the most surprisingly fruitful and fascinating lichen results from the lockdown came from not stepping out the door: John Douglass, in South Lanarkshire, for example, writes “I was sorting through some old boxes of specimens… and came across some C[aloplaca] aractina collected from a coastal rock face on Muck (2012). I have checked it against my collections from the Lizard and the spores etc. check out good for this species.” Apart from John’s Muck revelation, C. aractina is confined in the British Isles to coastal rocks at The Lizard, in Cornwall, so this find is a lovely disjunct extension.’
To conclude
As for the BW editorial team, while we have each been left slightly envious of those people with gardens we made the most of our daily exercise walks.
Catherine Mitson, BW‘s Assistant Editor, reports: ‘Except in times of flooding, the Exwick spillway is a popular route for runners and cyclists alike. To one side, however, is a less frequently visited footpath that follows the natural flow of the River Exe. Here, the shrubs and trees grow a little more wild, and the tall bank to the right muffles the sound of passers-by. I can now enjoy the soundtrack of my walk, featuring the nasal ‘dzwee’ of Greenfinches, the chattering of Blackcaps, melodic Song Thrushes, and the drumming of a Great Spotted Woodpecker. This was the first time I had been here, despite living so close – a direct consequence of the lockdown. I now visit this small stretch almost every day and have seen the unmistakable flash of a Kingfisher, a Dipper on two occasions, and, looking up, there are often noisy Long-tailed Tits hopping around in the branches. During the last week of April, House and Sand Martins have arrived and are now regularly seen zipping across the river as the evening sets in. The first few sunny weeks of lockdown stirred many insects; of the butterflies I have spotted so far my personal favourites include Orange-tip, Common Blue, Peacock, Comma and Brimstone. My first Dark-edged Bee-fly of the year is always a personal highlight, but this was topped as I happened across a Hairy-footed Flower Bee nesting site in a cob wall less than five minutes from my house. These strange times have certainly opened my eyes to what lies just beyond my doorstep.’
For myself (Guy Freeman), the lockdown highlights have come from strolls along my local beach here in Teignmouth which, naturally, have been timed to coincide with the best tides. The shore – mostly expanses of brick-red sand – does not look the most inspiring from a rock-pooling perspective, but I always enjoy the challenge of searching for life in these damp deserts. The walks during lockdown have been among the most productive I have had here, with favourite finds including some of the more weird and wonderful sand-dwelling specialists – the Angular Crab, which looks too exotic for these shores, and the more common but equally bizarre Masked Crab.
Many thanks to all the contributors to this piece who responded so enthusiastically to our initial call for submissions.
The contributors featured here write regularly for British Wildlife– the magazine for the modern naturalist
Small mammals are charismatic animals, but often elusive. They are rarely seen as more than a passing glimpse of a small scurrying creature. Although sadly often viewed as pests, small mammals are an important part of our ecosystems.
In this blog we will focus on some of the most common, native species of rodent and insectivore in the UK, providing key characteristics that will help you to identify them in the field.
Mice
There are four species of mice in the UK. All have relatively large eyes and ears and long scaly tails with little or no hair.
Wood mouse/Field mouse– Apodemus sylvaticus
Identification: The wood mouse is a ‘stereotypical’ mouse in terms of appearance and has a chestnut-brown back and white belly. Long tail, large ears and big eyes. Moves quickly by hopping/jumping.
Size: 8-10cm with a very long tail of up to 10cm.
Habitat: Often found in woodland and fields but also common in a variety of other habitats. Generally the most often caught in small mammal surveys.
House mouse – Mus musculus
Identification: Grey–brown all over including the undersides.
Size: 7-9cm with a tail of up to 10cm.
Habitat: Commonly associated with houses, buildings and barns, although also found in the countryside. This species is one of the more commonly spotted due to its cohabitation with humans.
Harvest mouse – Micromys minutus
Identification: A very small mouse with golden fur and white undersides. Its long tail is prehensile and can be used as an extra ‘limb’ to hold onto vegetation as it climbs.
Size: The UK’s smallest rodent; roughly 5-7cm in length.
Habitat: Lives in long vegetation such as reed beds, marshes and roadside verges. Builds small, round nests made of intertwined grass stalks.
Did you know? The average adult harvest mouse weighs roughly the same as a two pence piece!
Yellow-necked mouse – Apodemus flavicollis
Identification: This species looks almost the same as the wood mouse in appearance, except that the yellow-brown colouration on its back continues around in a band across the neck.
Size: 9.5-12cm, very slightly larger than the wood mouse. Tail 8-12cm in length.
Habitat: Woodland, hedgerows and gardens; range is restricted mainly to southern Britain.
Voles
In comparison to mice, voles have much shorter and more rounded snouts. They also tend to have smaller ears and eyes in proportion to their body size. There are three species of vole native to mainland UK: two of these species – the bank and field vole – appear very similar and are easily confused.
Bank Vole – Myodes glareolus
Identification: Red-brown upper coat with a pale cream/grey underside. The bank vole’s tail is about half the length of its body. This is an important distinguishing factor for comparison with the field vole which has a proportionately shorter tail.
Size: 9-11cm, tail length 3-7cm.
Habitat: The bank vole is often found in hedgerows, heathland, grassland and woodland, as well as in more urban areas.
Field Vole – Microtus agrestis
Identification: The fur of the field vole is more yellow-brown than the bank vole. It is often described as ‘cooler’ in colour. The underside is creamy-grey. Its tail is about a third of the length of its body (shorter proportionately when compared to the bank vole). For this reason it is also known as the short-tailed field vole.
Size: 9-12 cm in length (not including tail).
Habitat: Ungrazed grasslands and areas of tussock are the preferred habitat, although this adaptable mammal will find a home wherever grass is available.
Did you know? The field vole is estimated to be the most abundant mammal in the UK, although it is rarely seen. Look out for small round tunnels in areas of long grass. You may even find a ‘lawn’ at the entrance with shortened grass and piles of grass cuttings.
Water Vole – Arvicola amphibious
Identification: Dark brown fur and a hairy tail which is about half the length of the head and body. Characteristic bright yellow teeth.
Size: Up to 22cm in length excluding the tail. Roughly rat-sized (double the size of the field and bank voles).
Habitat: As the name suggests, this vole spends much of its life in the water. They live in burrows alongside river canals and are most often spotted swimming.
Did you know? When startled, water voles dive into the water making a characteristic ‘plop’ sound. So, be sure to keep an ear out when walking alongside rivers.
Shrews
There are four species of shrew native to the UK, although only three are found on the mainland. The other – the greater white-toothed shrew – is found only on islands such as Guernsey, Alderney and Herm.
Shrews tend to be smaller than most other species of small mammal found in the UK, and have a distinctive long pointed snout and very small eyes and ears.
Common shrew – Sorex araneus
Identification: Fur is three-toned, transitioning from dark brown on the back to paler brown to white on its undersides. The common shrew has a tail which is roughly half the length of the body; this is shorter, proportionally, than that of the pygmy shrew.
Size: 4-8cm in length, tail 2.5-4.5cm.
Habitat Widespread across a variety of habitats including gardens, hedgerows, grassland and woodland.
Did you know? Common shrews have a very high metabolism and must eat every 2-3 hours in order to survive.
Pygmy shrew – Sorex minutus
Identification Two-toned fur going from a grey-brown upper to an off-white belly. The pygmy shrew has a longer and wider tail in proportion to its body when compared with the common shrew; roughly two-thirds of its body length.
Size: 4-6cm in length, tail 3-5cm.
Habitat: Widespread across a variety of habitats including hedgerows, grassland and woodland.
Water Shrew – Neomys fodiens
Identification: Black/dark brown fur on top, with a very contrasting pale grey underside. Often have little silver ear tufts and white hairs around the eyes.
Size: 6-10cm, the UK’s largest shrew species. Tail 4.5-7.5cm.
Habitat: Usually found near streams and wetlands. If you see a shrew swimming, it is most likely this species! They even swim underwater to hunt for prey.
Did you know? The water shrew is a venomous mammal. Its saliva can paralyse even larger prey such as frogs and newts.
Other
Hazel Dormouse – Muscardinus avellanarius
Identification: Golden fur, big ears and eyes. The most characteristic feature is their incredibly fluffy tail. This means that they are sometimes mistaken for a young squirrel.
Size: 6-9cm, tail 5.5-7cm.
Habitat: Dormice are arboreal, meaning that they spend most of their lives in trees, although they return to the ground to hibernate during winter. Despite their name, hazel trees are not a habitat requirement – although they are often preferred. Found in coniferous, deciduous and mixed woodland.
Did you know? The hazel dormouse is not technically a true mouse. They are related to both mice and squirrels but are classified in their own separate family.
Provides a solid grounding in mammal identification skills. Includes excellent illustrations of mammals, their tracks and signs and also discusses survey methods using the latest techniques and technologies.
Live Trapping Small Mammals: A Practical Guide #248012
Provides practical advice on trapping small mammals.
Mammal Tracks of Europe: A Field Guide to the Tracks and Trails of European Mammals#264590
This essential field companion covers the tracks and trails of 72 European mammal species and includes detailed life-size drawings by the author.
This laminated pamphlet is produced by the Field Studies Council and contains images of all of Britain’s land-based mammals. Provides a useful overview and aid to identification.
A Guide to British Mammal Tracks and Signs #128853
This Field Studies Council guide is the perfect solution to identifying the presence of mammals from their tracks and signs. Footprints, dropping and feeding remains are all included in this helpful laminated pamphlet.
Looking for some inspiration for activities during 30 Days Wild? Why not take a stroll around sunset and see if you can find some bats. If you have a bat detector then you can also listen to the ultrasound calls they produce and have a go at working out which species you’re seeing and hearing. Plus, an evening walk also gives you a chance to see what other nocturnal animals are out and about – owls, foxes, badgers and toads are all more active at night and, if you’re lucky and in the right place, you might also be fortunate enough to hear a Nightjar.
What you need:
• Bat detector – For beginners, a heterodyne detector is a great choice as they are economical and easy to use. Simply tune it to the frequency that you want to hear and then listen through the speaker or with a pair of headphones. If you want something a little more advanced, the Echo Meter Touch 2 connects directly to your phone and lets you view and record the bat calls, as well as suggesting the most likely species that you’re listening to. (If you don’t have a bat detector, you can still go for a walk at dusk and look for bats flitting beneath the trees and across the surface of the water). • Torch – Not for seeing the bats but for finding your way safely in the dark!• Warm clothing and sensible footwear – Make sure you have enough warm clothes for when the temperature drops after sunset, and footwear that’s suitable for the chosen terrain. A thermos with a hot drink is also a good idea! • Guide to bat frequencies – If you’re less familiar with bat detecting then a list of the frequencies at which you are most likely to receive the strongest signal for each species is a good thing to have with you. This simple pdf can be printed out to carry with you, or why not take a look atthis guide from the Bedfordshire Bat Group for more detailed information on identifying bats using a heterodyne detector. The FSC Guide to British Bats is also a good choice and provides lots of information on identifying bats in flight.
When to go:
Bats are most active from April to September and the best time of day for seeing and hearing them is around sunset. If you’re walking to a location where you will be using your bat detector or hoping to see bats, then make sure you set off with plenty of time to get there before the sun sets. And don’t forget your torch – even though it will be light when you set out, you’re likely to need it on the way home.
Where to go:
Parks and woodland, especially those with aquatic areas such as ponds and lakes, are great places to find bats. If you can find a walk that covers a variety of habitat types then this will increase your chances of seeing/hearing more than one species. Make sure that the route you choose is safe and accessible and that you know where you’re going – places can look very different at night than they do in the day and it’s easy to lose your sense of direction if you’re not on a clearly marked path.
If you don’t want to venture far from home, then you can also look and listen out for bats in your garden. Near hedges or trees is usually a good place to focus your attention.
What to do:
Once sunset is approaching, simply turn your bat detector on, keep as quiet as you can and watch and listen for any bats. The earliest species to emerge tend to be the pipistrelles and noctules. Of these, common and soprano pipistrelles are the most frequently seen. For this reason, it is worth setting your detector to 45 or 55kHz (or switching between the two periodically) to see if you can pick up any sounds. If you can see bats flying but don’t hear any sounds at these frequencies, then try scanning through all frequencies slowly to see which produces the most significant and clear response.
If you are near water and see bats skimming the surface, then these are likely to be Daubenton’s bats. As with the common pipistrelle, Daubenton’s bats produce the strongest echolocation signal at around 45kHz. (They also tend to emerge later than pipistrelles, so you may have to wait until later in the evening to catch a glimpse of these!).
Once you become used to using your detector, you will become accustomed to the different types of noises produced by different species and, in combination with where and how the bats are flying, will become more confident in deciding which species you are looking at and listening to.
Find out more:
If you want to find out more about bats, the Bat Conservation Trust website is a great resource and offersinformation on all 18 species of bat found in the UK. They also provide a list of local bat groups and coordinate the National Bat Monitoring Programme. Surveys cater to different levels of experience and knowledge and are fun and rewarding to carry out. Some don’t require any equipment, so you can take part even if you don’t own a bat detector.
Head over to nhbs.com for our complete range of bat detectors and take a look at our blog post for more tips for beginners.
The RSPB website is a great place to hear common bird songs and will help you to distinguish between different types of owls. The most common species you are likely to come across are Barn Owls and Tawny Owls. You can also hear an example of a Nightjar call on the website.
This fold-out guide includes 16 species of bats that live and breed in Britain and has two parts: a guide to identifying bats in flight using bat detectors, flight patterns, size, habitat and emergence time after dusk; and a key labelling the different body parts of a bat for identifying them in the hand.
This book takes the reader through both the theoretical and practical aspects of the use of the bat detector and covers all aspects of bat identification in the field, including `jizz’, flight style, foraging behaviour, roost finding, echolocation, and basic survey technique. As each topic is explained, references are given to the relevant tracks on the CD.
Covers topics such as the properties of sound; how bats use sound; bat detection methods; recording devices; analysis software; recording techniques and call analysis. For each species found in the British Isles, information is given on distribution; emergence times; flight and foraging behaviour; habitat; and echolocation.
Image credits:
(a) n51_w1150 from the Biodiversity Heritage Library via Flickr
Throughout June, thousands of people will be taking part in The Wildlife Trusts’ 30 Days Wild. Designed to improve our health and wellbeing, as well as being good for the planet, this annual challenge tasks us to do one wild thing a day for the whole month. Sign up on the Wildlife Trusts website and receive a free downloadable pack of goodies to help you plan your activities.
Here at NHBS we rarely need an excuse to get outside for a spot of wildlife watching. And as lots of us are currently working from home, we’ve been enjoying the opportunity to take stock of the nature that’s much closer to where we live. We’ve also been sharing our wildlife photos, all taken in gardens or on local walks. Scroll down for some of our favourites from the past month.
Why not let us know in the comments about what activities you get up to in June – we’d also love to see some of your photos!
Oli has been busy in the garden with his moth trap – a recent catch included this oak beauty, a couple of early greys and a stunning puss moth. A felt refuge tile also attracted a lovely group of slow worms.
While dismantling an old shed in her garden, Natt discovered this cheeky creature. She also captured an image of a vibrant brimstone moth.
Toby came across this group of hungry mouths in his stables.
Phil was excited to see that his solitary beehive had attracted some inhabitants.
After creating a hole in his fence to help hedgehogs move from garden to garden, Paul was rewarded with this welcome visitor. (With drastic reductions in road traffic, hedgehogs are one of the species that are expected to be benefiting from the lockdown!)
Chris discovered this nest, packed with eggs.
Luanne caught some great moths in her garden in north Wales – including this eyed hawk moth and buff tip.
Tabea took this lovely picture of a stonefly while on a local walk.
Angeline captured some great images of insects enjoying the local flora.
Nigel found this tiny slow worm in his garden and also discovered a bumblebee nest in his compost bin.
While working from home, Elle has been enjoying watching the birds visiting her collection of feeders.
Finally, Guy captured this charismatic shot of some of the frequent visitors to his local rooftop.
Have you spotted anything exciting in the garden or while on walks this spring? If so, we’d love to hear about it and to see your photos!
WILDGuides publish a wide array of practical, durable and authoritative natural history titles. Ranging from photographic field guides that cover the wildlife of Britain and Ireland, to visitor’s guides and reference works on wildlife regions around the world.
With a prodigious amount of new and forthcoming titles published this year and all at fantastic prices, now is a great opportunity to discover WILDGuides comprehensive and authoritative publications.
Bestsellers and new titles
Britain’s Ferns: A Field Guide to the Clubmosses, Quillworts, Horsetails and Ferns of Great Britain and Ireland
By: James Merryweather
Flexibound | Just Published! May 2020| £14.99£19.99
A comprehensive, lavishly illustrated and user-friendly photographic field guide to all the pteridophytes of Britain.
Britain’s Birds: An Identification Guide to the Birds of Great Britain and Ireland
By: Rob Hume, Robert Still, Andy Swash, Hugh Harrop and David Tipling
Flexibound | Just Published! May 2020| £14.99£19.99
Four years after the successful first edition, Britain’s Birds returns in a second edition.
Europe’s Dragonflies: A Field Guide to the Damselflies and Dragonflies
By: Dave Smallshire and Andy Swash
Flexibound | Just Published! May 2020| £19.99£24.99
With over 1200 colour photos, Europe’s dragonfly fauna is given the WILDGuides treatment.
Britain’s Hoverflies: A Field Guide
By: Stuart Ball and Roger Morris
Flexbound | April 2015| £19.99£24.99
A beautifully illustrated photographic field guide to the hoverflies of Britain
Britain’s Mammals: A Field Guide to the Mammals of Britain and Ireland
By: Dominic Couzens, Andy Swash, Robert Still and Jon Dunn
Flexibound | April 2017| £13.99£17.99
A comprehensive field guide to all the mammals recorded in Britain and Ireland.
Britain’s Reptiles and Amphibians: A Guide to the Reptiles and Amphibians of Great Britain, Ireland and the Channel Islands
By: Howard Inns
Flexibound | July 2009| £13.99£17.99
A detailed guide to the reptiles and amphibians of Britain, Ireland and the Channel Island.
Britain’s Day-Flying Moths: A Field Guide to the Day-Flying Moths of Great Britain and Ireland
By: David E Newland, Robert Still and Andy Swash
Flexibound | July 2019| £13.99£17.99
A photographic guide to the moths you are most likely to see during the day.
Britain’s Plant Galls: A Photographic Guide
By: Michael Chineryh
Flexibound | Sept 2011| £12.99£16.99
Aims to help both beginners and experts alike to learn more about the galls and what causes them in the first place.
Forthcoming
Britain’s Orchids: A Field Guide to the Orchids of Great Britain and Ireland
By: Sean Cole and Michael Waller, Sarah Stribbling (illustrator)
Flexibound | Due August 2020| £15.99£19.99
Combines nearly 100 illustrative plates with over 1000 colour photos
Britain’s Spiders: A Field Guide
By: Lawrence Bee, Geoff Oxford and Helen Smith
Flexibound | Due September 2020| £19.99£24.99
This fantastic photographic guide is coming as a second edition, with nine more species and updated information
A new firmware update (V1.6) is available for the Anabat Swift. This update will introduce the following changes:
• Spanish language added.
• Low battery warning messages clarified
• Bug fix: “Constant Recording” didn’t always start when expected
• Bug fix: Display of months in the schedule editor
• Several usability improvements
• Improved menu layout
This update should be installed on all your detectors as soon as possible to ensure that they continue to run smoothly. Full instructions below.
Method 1 – Using an SD Card
Step 1 – Download the update file using this link and copy it to the root directory on your SD card. Make sure the file is named swift.adx. You can use the same SD card to update multiple Swifts.
Step 2 – Insert the SD card and fresh batteries into your Swift then power it on. Make sure that there isn’t a second SD card in the Swift. After a short time the following message will appear: “Swift update 1.6 available. Would you like to update?” Press “Yes” to start the update. Do not remove the batteries or power off the detector while the update is being installed. The red Mode lights will flash in sequence while the update is being installed. When the flashing stops, your Swift will restart with the new firmware. You may get a message about a new “bootloader available”; if so, please proceed with this update by pressing the “Upgrade” button.
If your Swift doesn’t detect the software update on the SD card, it may be using a very old firmware version. If this is the case you will need to follow Method 2 (below).
Method 2 – Using Insight and a USB cable
If you haven’t used your computer to update your Swift previously, you will need to follow Step 1 to install the necessary software on your PC. If you’ve already done this before, skip ahead to Step 2.
Step 1 – Install the required software as follows:
For Windows PCs, click here to download and run the following program to install the Anabat Swift USB Driver for Windows. Mac users don’t need to install this driver.
Next, click on one of the following links to download and run the installer for Anabat Insight. Please choose the download that matches your Operating System version.
Step 2 – Ensure you are connected to the internet. Run Anabat Insight and install any Insight updates that are available. This will be indicated by a green bar near the top of the program window. Ensure the Swift’s battery holder is fitted with fresh batteries.
Step 3 – At the top of the Insight screen, click on the menu that says “Devices”. You should see “Swift” under this menu. Click on “Swift”. (*If you don’t see this then you may have an old firmware version that requires an extra step – in this instance, see below for further instructions).
Step 4 – A window will appear displaying your current firmware version and the latest version available from Titley Scientific. Press the “Download” button to download the new firmware to your computer. Once downloaded, you can press the “Start” button to install the new firmware on your Swift. Once complete, the text “Finished” will appear.
Step 5 – Once the installation is complete, remove the batteries and then reinsert them to restart your Swift with the new firmware. You may get a message about a new “bootloader available”; if so, please proceed with this update by pressing the “Upgrade” button.
*Additional step for old firmware versions
This step may be required before step 3 if you have a particularly old firmware version. Please follow the steps below and then resume the above procedure from step 3.
1. Remove the battery holder from your Swift.
2. Hold down the power button (in the centre above the screen) while re-inserting the batteries. Make sure to hold the button down for a few more seconds after getting the batteries in place. The screen on the Swift will remain black. (This step is required for this firmware update only and will not be needed in the future.)
Troubleshooting
If your Swift fails to turn on after the update, try removing the main battery pack and the clock battery (coin cell) for a few minutes. Reinstall the batteries and then try again.
If you are still encountering any difficulties with this process, please contact Andrew Dobson (andrew.dobson@titley-scientific.com) for assistance.
An endoscope (or more correctly a borescope) is an optical device with an eyepiece or display at one end and an objective lens or camera at the other end, linked by an optical or electrical cable that relays the images. They have a broad range of applications, from medical investigations to drain inspections and are fantastically useful for ecologists as they give visibility of inaccessible places such as mammal burrows and bat roosts (for licensed bat workers only). They have the added advantage of minimising disturbance by being less intrusive than visual inspections and many handheld units can now capture still images and video footage for a permanent record.
The innovative Video Endoscope is a pocket-sized inspection camera that is ideal for examining crevices, cavities, burrows and nests. It is very ergonomic with a clear, user friendly interface and durable design. The semi-flexible 1m camera tube neatly coils into a cleverly designed groove at the back of the device and it has a protective carry case, making it very portable. The 3″ screen has an HD resolution with 720P and the camera has six LEDs with adjustable brightness control and digital 2x zoom, to ensure the picture is clear. This endoscope records still images and video on to a MicroSD card and is powered by 4 x AA batteries. We took the endoscope out to field test it in a pond to look for tadpoles and to examine nests in nest boxes.
How We Tested
The Video Endoscope camera is IP67 water resistant so we wanted to test its performance when recording underwater. It also has adjustable LED brightness so we wanted to test it in dark conditions. We chose a pond on a farm in West Dorset known to have some tadpoles and selected some nest boxes in a nearby area to examine for nesting activity. We used a 16GB microSD card and 4 x new AA alkaline batteries.
What We Found
The Video Endoscope was really easy to set up and use. The controls are clear and the menus are simple to navigate. It was simple to switch between photo and video mode and to control the LED brightness and zoom. This meant that our attention was focused on capturing the best possible footage in the field. The images and videos we recorded underwater were clear and sharp, in spite of the debris in the pond and we got some good footage of tadpoles.
It is quite difficult to control the full length of the cable as it is flexible, so we found it was necessary for the observer to be stood quite still. This was particularly evident when trying to use the endoscope in nest boxes. This is shown by the difference between the two videos below – in the first one you can just glimpse some eggs but we didn’t manage to count them properly and it was hard to capture them in subsequent videos.
However for checking quickly in a nest box to see if it was occupied it performed excellently. The adjustable LED brightness was particularly useful when checking the nest boxes and looking under rocks.
We edited the videos using Microsoft Video Editor, which meant that we could flip the image when it was recorded upside down, as it is quite difficult to keep the image the right way up when the camera cable is fully extended. The endoscope does have an image flip function, which is very handy when you have the camera positioned well but the image is inverted.
Our Opinion
The Video Endoscope is a fantastic, versatile piece of field equipment that could be useful in many different survey scenarios. It is particularly impressive when used underwater as the photos we took in a rockpool survey last year demonstrate. It is very portable because the cable coils neatly into the body of the endoscope and the controls are simple to use. The quality of the still images and the video footage are fantastic, and the adjustable LEDs mean that you can get decent images from quite dark spaces. For more information, or to purchase a Video Endoscope, please visit our website or contact us.
Butterflies are an iconic and popular sight during the spring and summer months. They are also important indicators of a healthy ecosystem and provide valuable environmental benefits such as pest control and pollination. As food for birds, bats and other mammals they are a vital part of the food chain and have been used for centuries by scientists to investigate navigation, pest control and evolution, as well as countless other subjects.
In the UK there are currently 57 resident species of butterfly and two regular migrants. Of these, it is estimated that 76% have declined in abundance, occurrence or both over the past 40 years. Almost all of these losses can be attributed to man-made changes such as habitat destruction and pollution, along with larger patterns of weather and climate change.
Recording and monitoring butterflies is a vital step in ensuring their conservation. Contributing to citizen science projects such as Butterfly Conservation’s Butterflies for the New Millenium, the UK Butterfly Monitoring Scheme, or via the iRecord app are vital to gain a picture of how our butterflies are faring. Although at this time it is not possible to travel to survey and record butterflies, sightings within your garden or on your own land, as well as those spotted on local walks, still provide a valuable source of data. (Please read the most recent Covid-19 statements on each of these websites before undertaking any surveys.)
In this article we have compiled a short guide on which butterflies you are likely to see outside this spring/summer, as well as some tips on the features by which you can distinguish certain species.
Gardens
For many butterflies we need look no further than our back gardens. In the UK many generalist species of butterflies survive and thrive in the network of gardens that stretch out across the country. These species are drawn in by the bountiful supply of nectar offered by flowering plants such as Buddleia, which are seldom without a visiting Red Admiral or Peacock. Gardens with unmanaged patches are even more favourable, as these can provide larval host plants such as thistles and nettles, the latter of which are used by four different butterfly species.
LOOK OUT FOR:
1. Large White: Large and often found near brassicas and nasturtiums
2. Small Tortoiseshell: Medium-sized, often bask in open sunny spots
3. Red Admiral: Large and territorial with unique black and red colours
4. Painted Lady: Large fast flyers with very angular wings 5. Small White: Medium-sized with yellowish under-wings, eat brassicas
6. Peacock: Large, dark butterfly with distinct eyespots on its wings
Grasslands, Parks and Fields
Grasslands are an incredibly valuable habitat for many of the UK’s moths and butterflies. Semi-natural grassland, pasture, arable land, urban parkland and any areas with rough unmanaged grass will all support a variety of butterfly species. In the height of summer these areas can be teeming with Skippers, Common Blues, Ringlets and Meadow Browns. Be sure to inspect any flowering plants (particularly thistles and knapweeds) as these can act as vital nectaring points for many butterflies. Pay close attention for the fast and subtle movements of smaller species as these can often disappear against such a busy environment. A prime example of this is the Small Copper which is notoriously hard to spot due to its minute size, fast flight and discrete colouration (when its wings are closed).
LOOK OUT FOR:
1. Meadow Brown: Very common, with dull orange patches on the wings 2. Green-veined White: Have a distinct green colour around the wing veins 3. Small Copper: Small and fast, has deep brown and bright orange wings
4. Common Blue: Small with a vivid blue colour and unbroken white border 5. Six-spot Burnet (moth): Has distinct pattern, often feed on Thistles 6. Ringlet: Common, wings can appear black and have distinct yellow rings 7. Marbled White: Large slow flyers with a unique chequered pattern
Hedgerows and Woodland-Edge
Edge habitats are well known for their butterfly diversity and abundance, housing many threatened and elusive species. There are a few species which you are likely to see in these areas, however, bear in mind that species such as the Brimstone, Speckled Wood and Gatekeeper can also occur in several other habitats. Sunny areas with flowering shrub such as Bramble are hotspots for activity, particularly for Gatekeepers. Holly Blues may be hard to spot as they are mostly arboreal, only descending to feed on flowering plants such as Ivy. Woodland interiors are unlikely to yield many butterflies, particularly those with little light and/or limited forest floor plants, however open sunny glades are worth visiting.
LOOK OUT FOR:
1. Brimstone: Large with a powdered yellow/green colour and slow flight
2. Comma: Large with a uniquely scalloped wing edge and fast flight 3. Gatekeeper: Small size, often found around hedges with bramble growing
4. Holly Blue: Very small, flying around tree tops, especially those with Ivy
5. Speckled Wood: Medium size, very territorial and regularly sun bask 6. Silver-Y (moth): Fast flying with a distinct silver ‘Y’ on the upper wing
Butterfly Conservation
Thanks to Butterfly Conservation for letting us use their images throughout this article. For more information on UK butterflies and how you can help them, please visit Butterfly Conservation.org. Here you will find a wealth of information to help you find and identify butterflies and moths.
Butterfly Field Guides
Guide to the Butterflies of Britain and Ireland #245262
The illustrations in this guide, from originals painted by Richard Lewington, show 58 British butterfly species. The paintings are a quick identification aid to the butterflies most likely to be seen and all are drawn to life size.
Pocket Guide to the Butterflies of Great Britain and Ireland #245485
This handy pocket-sized book has become the essential guide to identifying the butterflies of Great Britain and Ireland. It contains over 600 superb illustrations of the life stages of each species, together with beautiful artworks of butterflies in their natural settings.
Butterflies of Britain and Europe: A Photographic Guide #245243
Packed with beautiful photography, this is the definitive guide to all 482 species of European butterflies (42 more species compared to the first edition) with additional information on over 60 species found in the far east of Europe, stretching as far as the Urals and Caucasus.
Collins Butterfly Guide #173624
This comprehensive guide describes and illustrates about 440 species, depicting both males and females and – where there is significant variation – subspecies. Distribution maps accompany every widespread species.
The Butterflies of Britain & Ireland #245487
Provides comprehensive coverage of all our resident and migratory butterflies, including the latest information on newly discovered species such as the Cryptic Wood White and the Geranium Bronze. The definitive book on the subject, it includes fully updated distribution maps.
Field Guide to the Caterpillars of Great Britain and Ireland #248267
This beautifully illustrated field guide covers caterpillars of the moth and butterfly species that are most likely to be encountered in the British Isles.