There has been a wealth of climate change-based publications in recent times reflecting the growing urgency of this issue. In this blog post, we present a selection of thought-provoking titles on climate change, from handbooks for how we should proceed into the future, to how climate change has and may impact biodiversity on a more local scale
Great Crested Newts are the UK’s most strictly protected amphibian, requiring licensed ecological surveys if a development may affect them. As the first signs of spring emerge, ecologists are preparing for the start of this year’s newt survey season. Below, we have compiled a list of the most common newt survey methods and the equipment needed for each, so that you can ensure you have everything you need as the survey season approaches.
Netting for adult and larval newts can be a useful tool in both survey and relocation. Here at NHBS, we have designed an amphibian net specifically for the safe and efficient capture of newts. The net bag is attached by a wide velcro collar which prevents newts from becoming caught between the frame and the bag. The bag can also be removed from the frame to be disinfected between sites. The seams have been carefully placed so that they do not come into contact with the front edge of the net, and the material of the bag is a soft 2mm mesh. The net head is 300mm wide and comes with a sturdy, wooden 1.2m handle. We also sell a diamond-shaped amphibian net that comes in either standard depth or deep. Its shape is ideal for easy and safe capture for amphibians and is also available in a collapsible frame for easy transport between sites.
The presence of Great Crested Newts can be determined by analysing pond water samples for newt DNA. This process is known as eDNA sampling and is a recent but very effective way of newt surveying that causes very little disturbance to the newts themselves. Provided that the sampling and analysis protocol complies with DEFRA guidance and that samples are collected between 15th April and 30th June, then eDNA test results are accepted by Natural England and Natural Resources Wales. This year, NHBS has once again teamed up with eDNA laboratory, Nature Metrics to deliver a complete Great Crested Newt eDNA analysis service. Combining our expertise in sourcing, packing and shipping equipment with the excellent laboratory proficiency of Nature Metrics, this partnership facilitates a fast and efficient service. If you would like to find out more about the eDNA services that Nature Metrics provide, please visit www.naturemetrics.co.uk
The Dewsbury trap is an innovative design of newt refuge trap that is exclusive to NHBS. The clever design of this trap ensures that any trapped newts have access to both fresh air at the top of the trap and a thermally stable refuge at the bottom of the pond. They can be easily deployed from the edge of the pond meaning that not only is this trap safer for newts, but it is also safer and more convenient for surveyors too. In preliminary trials the Dewsbury trap was found to be more effective at catching newts than traditional bottle trapping methods and can be left unattended for up to 24 hours meaning night visits are not necessarily required.
Please note: we recommend that you contact your national licensing authority (Natural England, Natural Resources Wales, Scottish Natural Heritage, etc) before you purchase this trap. The Dewsbury Newt Trap is not included within either the Level 1 or Level 2 Natural England Class Survey Licence and a separate licence is required
Bottle trapping is a popular method of surveying for both detecting and assessing populations. It can, however, become quite labour intensive, especially if you are looking to cut bottles into traps yourself. To save yourself some valuable time, we sell pre-cut bottle traps with the head inverted and ready to deploy. These can be bought in packs of 40 or 120 and are cut from 2l PET bottles with a 28mm neck diameter. Alternatively, we sell the whole bottles if you would rather cut the traps yourself.
Torching is a less invasive and effective method of counting/observing newts without the need for capturing them. Torches are recommended to be between 500,000 and one million candlepower and need to ideally last several hours at a time. The Cluson CB2 range is very popular among ecologists and provides 1 million candlepower with long lasting battery life and an easy-to-use pistol type grip. For a more lightweight and economical option, the LED Lenser is a powerful torch that offers up to 450 lumens and a sharply focused circular beam that can last up to 300 hours on a low power setting.
Fencing can either be used to temporarily exclude or contain newts in mitigation projects. It can also be used to aid the capture of newts for relocation and is typically a short barrier with the base buried underground. Our Tristar Newt Fencing comes in rolls of 100m, is made of UV stabilised polythene sheeting and tinted green. It is designed to resist weather damage and has a life expectancy of 5 years, making it ideal for temporary mitigation projects during development works. It is easy and simple to put up and can be fixed into place with our soft wood stakes.
Often, pitfall traps are used alongside drift fencing in order to trap and translocate newts in relocation projects. They consist of a container that is buried underground often flush with the edge of drift fencing. Both square buckets and round buckets have been shown to be effective and we supply several options depending on your preferences.
Below are some accessories that may come in use when surveying Great Crested Newts:
The exciting environment of the rocky shore receives a space in the limelight with this new volume. The authors guide the reader through all aspects of the rocky shore including geology, ecology and natural history. It would make a fantastic addition to any naturalist’s book shelf.
John Archer-Thomson and Julian Cremona have spent their lives in environmental education and conservation. They are a former deputy head and head respectively of the Field Studies Council’s Dale Fort Field Centre in Pembrokeshire. John is now a freelance coastal ecologist, photographer, writer and tutor, while Julian is the author of several books on exploration, nature and photography.
To introduce the authors and their book, we took the opportunity to talk to them about their inspiration for this volume and ask for tips for how we can get involved with rocky shores. Both authors will be signing copies which are available to pre-order on the NHBS website.
What drew you both to this habitat and inspired the production of this fascinating book?
As we say in Chapter 1, we were both born near the coast and grew up loving the sea and so were always drawn to the intertidal, especially as many of the inhabitants are quite weird. From the earliest days with the Dorset Wildlife Trust John enjoyed communicating his love of the shore and the importance of its conservation and the need to respect the natural world. As a child Julian collected all manner of natural material from the shore and after graduation taught seashore ecology in Dorset. We see Rocky Shores as an extension of this mission.
How did you even begin to write this book on such a wide-ranging topic?Forty years of running inter-tidal field courses tends to focus attention on making shores accessible to newcomers, we approached the book from a similar standpoint. John particularly likes molluscs, seaweeds and lichens; Julian, all types of invertebrates especially insects, and as ecologists we love the way the component parts of the system interact, John is also particularly interested in how humans are affecting the shore while Julian has spent much of his life travelling the coast of the British Isles. Thus certain chapters suggested themselves!
What was your most exciting find on a rocky shore that people should look out for in the future?
For John it has to be echinoderms in general and Julian likes the more microscopic life living amongst seaweeds in rock pools. We don’t quite know why, but the little pseudoscorpion called Neobisium maritimum always causes excitement for both of us. They are tiny, only a few millimetres long, quite uncommon and may be found by observing the Black Lichen Lichina pygmaea in which they sometimes hide.
I recommend this book as a fantastic in-depth overview, but what would you suggest readers do to further their rocky shore learning?
John runs a “Rocky shore invertebrates” course for the Field Studies Council at Dale Fort Field Centre. This looks at the ecology of the shore, zonation patterns, adaptations of organisms to this extreme environment and of course the ‘plant’ (and planktonic) life that supports this biodiversity: come on this. Alternatively, there are fold out (FSC) keys for a more do-it-yourself approach, in fact, two of these have been produced by Julian’s daughter Clare Cremona including the Rocky Shore Trail. In 2014 Julian produced a large book called Seashores: an Ecological Guide, which has a huge number of photos to help with the identification of commonly found species and explains how they interact on the shore. A Complete guide to British Coastal Wildlife by Collins and the excellent A student’s guide to the seashore by Fish & Fish. For a more academic, but still very readable, account try The Biology of Rocky Shores by Little et al, Oxford Press.
Although adaptable, rocky shore inhabitants are not invincible, what do you think is the biggest threat to the rocky shore ecosystem and are some species more at risk than others?
That’s easy: us. There are too many human beings gobbling up habitat, consuming resources, changing the climate, raising sea levels, acidifying the ocean, over-fishing, polluting with plastic, agricultural and industrial chemicals and so on. Stressed ecosystems tend to be species poor but there are often large numbers of a few fast growing, tolerant species that do well. Northern, cold water species are already suffering range contractions as the climate warms, whereas the opposite is true of southern, high temperature tolerant forms, including invasive species from warmer climes.
Staying on the theme of the future, what is next for you both – another book perhaps?
For John this would be intertidal and sublittoral monitoring and photography. Running courses for the FSC. Talks for local natural history groups. Magazine articles and an update of “Photographing Pembrokeshire” by John & Sally Archer-Thomson, Apple iBooks. Julian has a trio of specialist photography books being published by Crowood press. The first two on extreme close-up photography have already appeared and the third will be published at the beginning of April. He continues to develop new ways to photograph wildlife, especially the “very small”. Coupled with this 2019 includes running further workshops, lecturing and travel – for the wildlife!
Small mammals are common and widespread across many of our terrestrial ecosystems. They play a crucial role in ecosystem food-webs as key prey species for many carnivores and are also useful as indicator species for agricultural change and development. Consequently, surveys of small mammal populations can be a useful tool for ecologists, researchers, and conservationists alike.
Small mammals are most commonly monitored through the use of live traps. These allow a range of species to be monitored simultaneously and also allow biometric data such as weight and sex to be collected. In addition, estimates of population size and structure can be calculated using capture-mark-recapture (CMR) techniques. However, other more passive monitoring techniques such as dormouse nest tubes, hair tube, and footprint tunnels are also available. Below we will take a look at some of the most popular small mammal survey equipment.
Longworth traps have been widely used in the UK for many years. They are made from lightweight yet durable aluminium and have been consistently well documented in scientific literature and ecological reports.
The trap consists of two parts: a tunnel which contains the door tripping mechanism, and a nest box, which is attached to the back of the tunnel. The nest box provides a large space for food and bedding material to ensure that the trapped animal is comfortable until release. The sensitivity of the trigger mechanism can be adjusted depending on the target species, although Pygmy shrews have been known to be too light to trigger the mechanism. The door can be locked open for pre-baiting for ease of use.
The Longworth trap comes as two options: with a shrew hole or without a shrew hole (Please note that shrews are a protected species so ensure you are aware of the relevant laws in the country in which you are trapping).
Sherman traps are another popular live-trap which can be folded flat for ease of transport and storage. They work by a trigger platform which causes the entrance door to shut when an animal runs into the trap. Sherman traps are formed of one compartment and because of this, it can be difficult to add food/bedding into the trap without interfering with the trigger platform. The traps may also distort over time with repeated folding. Sherman traps come in a variety of sizes and lengths so that you can find a trap to best suit your target species and can be purchased as either an aluminium or galvanised version which is more resistant to rusting.
NHBS Water Vole Trap
If you are looking to trap and survey water voles, we offer a water vole trap which comprises an extra large (XLK) Sherman trap with its rear door removed and an attached nesting compartment. This trap is suitable for water vole survey, such as capture, mark, recapture studies, as well as water vole relocation projects.
Footprint tunnels are a less invasive method of surveying small mammals. Species presence/absence can be determined by examining the footprints made by mammals that have walked over an ink pad to reach the bait left in the tunnel. This method is especially useful for determining the presence of hedgehogs that are not otherwise easily ‘trapped’. The tunnel comes with a UK mammal footprint identification sheet; however it may be difficult to distinguish between some species of smaller mammals.
Squirrel Hair Traps
Squirrel hair traps are another non-invasive survey method that is designed for red squirrel survey. When squirrels pass through the baited trap, their hair is collected on sticky tabs within the tube. These hairs can then be analysed to determine whether red squirrels are present in the area.
Dormouse nest tubes are a cheap, easy and very popular method of determining the presence of dormice within a habitat. The tubes consist of a wooden tray and a nesting tube. Dormice make nests in the tubes and it is these that are used as indicators of their presence in the habitat. Dormice are legally protected in the UK and must not be handled unless you have a licence to do so. Nest tubes can be set up and checked without a licence until the first evidence of dormouse activity is found. After that, only a licensed handler can check them.
Accessories, guides and books
Below are some accessories, guides and books that are commonly used for mammal survey and monitoring:
Please note that some small mammal species are protected by law (e.g. shrews and dormice in the UK) and you must obtain a license from Natural England, Scottish Natural Heritage or the Natural Resources Wales if you set traps with the intention of trapping any species of shrew. Please ensure you are aware of and meet the requirements of any relevant laws in the country in which you are trapping. Please visit https://www.gov.uk/government/publications/survey-or-research-licence-for-protected-species for more information.
The destruction of aquatic ecosystems is a major issue facing conservationists globally – causes include microplastic pollution, acidification, global warming and over-fishing. The manufacturing team at NHBS have produced a series of new survey nets designed to help researchers gather data on microplastics and to sample plankton more efficiently. This blog describes the sea trials performed using our prototype nets to establish the optimal towing speeds and sea conditions as well as whether the nets worked effectively and were robust enough to withstand exposure to the marine environment.
Three new nets were tested – the Manta Trawl Net, which is designed to sample microplastics in calmer inshore waters and on rivers and lakes. The Avani Trawl Net, which is designed to sample microplastics in rougher, offshore environments and the Bongo Net (a pair of 300mm plankton nets joined in the middle and weighted with a depressor vane) which is designed to allow researchers to use two different mesh nets during a single trawl. Plymouth Sound was an ideal location, as we had both inshore and offshore designs to test and the breakwater provided us with easy access to both sheltered water and the open ocean.
The first design tested was the Bongo Net. The net performed very well. The sampling depth was easily adjusted by modulating the speed of the boat and the depressor vane kept the net level in the water. In our tests the Bongo Net performed best at towing speeds of between two and four knots.
Next, we tested our inshore Manta Trawl Net. The Manta Trawl Net is designed for microplastics sampling in calm inshore waters and on rivers and lakes. The Manta Trawl Net has a post box shaped aperture and twin ‘wings’ (manta wings) mounted onto the frame which serve to lift the net frame so that samples are efficiently collected at the top of the water column. This net was tested at a variety of towing speeds and performed best at speeds of between two and four knots.
The last net to be tested was The Avani Trawl Net. The Avani Trawl Net is designed for offshore microplastics sampling. The vertical orientation of the aperture of the net ensures that samples are collected from the top few centimetres of the water’s surface in slight to moderate swell conditions. To test this net, we ventured out beyond the breakwater where the swell was approximately 1-2m. The net stood upright and performed as expected at speeds of between four and eight knots when exposed to smaller waves of approximately one metre in height. When approaching larger waves, we found that the net had a slight tendency to cut into the side of the wave at speeds of between six and eight knots and that the net performed best at slightly lower speeds.
All of the nets functioned properly, and our haul included both microplastics and icthyoplankton (fish eggs and larvae). Both the frames and the nets also withstood the sea conditions well and we could find no faults with their design or build – all told a successful trial.
If you are interested in these nets look out for them in our 2019 catalogue, find them on nhbs.com, or contact us on firstname.lastname@example.org and we will send you more information as soon as it becomes available.
This year’s Big Garden Birdwatch will be held from 26-28 January: are you ready?
The RSPB Big Garden Birdwatch is the world’s largest garden wildlife survey – now in its 40th year! What began as a simple activity for junior members of the RSPB has now grown to a UK-wide activity with over half a million people regularly taking part. With 40 years of data to look back on, this annual event has become important in helping the RSPB monitor trends in the distribution and abundance of birds in the UK.
The Big Garden Birdwatch is easy to join (and you don’t have to be a member of the RSPB). Here’s how to take part:
Choose a good place to watch from for an hour between between Saturday 26th and Monday 28th January – either your garden, or a local park or green.
Relax and watch the birds.
Count the maximum number of each species you see at any one time. For example, if you see a group of three house sparrows together and later another two, and after that another one, the number to submit is three. That way, it’s less likely you’ll double-count the same birds.
Make a note of any other wildlife that you spot as well.
Submit your results, either on the Big Garden Birdwatch website, or by posting a paper form. Even if you don’t see anything, that’s still useful information.
Look out for the results.
You don’t need much to take part in BGB apart from a nice hot drink, some snacks and a pen and paper; but if you’d like to brush up on your garden wildlife here are a few books and items that can get you started:
Last year saw the publication of the first comprehensive review of the status of British mammal populations for over 20 years and and the more concise Britain’s Mammals 2018. These works provide vital reference texts for anybody working within UK mammal conservation and both titles express The Mammals Society’s commitment to science-led mammal conservation.
Forty Years of Publishing
To celebrate The Mammal Society, we are offering 20% discount on four of their important titles throughout January.
The Mammal Society aims to continue to publish new and updated titles in 2019 and beyond. We are particularly looking forward to a new edition to the long out-of-print Live Trapping of Small Mammals A Practical Guide which is currently in preparation.
The Mammal Society and NHBS
NHBS are proud to be the official distributor for all The Mammal Society books and are delighted to be able to help them communicate their expertise to passionate naturalists and conservation professionals alike.
To the general naturalist, ladybirds are arguably the most familiar group of beetles and an up-to-date field guide has been long overdue. Now, after exhaustive research and diligent illustrations, this brand new field guide covering all 47 species of ladybird occurring in Britain and Ireland is finally available.
The authors Helen E. Roy and Peter Brown and illustrator, Richard Lewington signing the hardback edition exclusively for NHBS. Available while stocks last…
They also found time to answer a few questions regarding the making of this definitive field guide to the ladybirds of Britain and Ireland.
With all the research, detailed illustrations, and accessible format design of this guide, how long has this project been in the making?
As the illustrations of the adults, larvae and pupae were all made from living specimens, collected in the wild, we needed at least two seasons to collect them all, and for Richard to illustrate them.
Ladybirds are a niche set of organisms which can be often overlooked, where did the inspiration to produce this field guide come from?
The brightly coloured ladybirds are an extremely popular group of insects but the small so-called inconspicuous ladybirds are under-recorded. Similarly, the larvae and pupae of ladybirds are less well known. We hope that this field guide, adding to the popular series of field guides published by Bloomsbury, will encourage recording of all ladybirds in all life stages. It is also a celebration of the amazing contributions to the UK Ladybird Survey from so many people.
Field guides can provide an essential tool to assist monitoring and conservation efforts of species. Could you explain why our ladybirds may need to be monitored?
Ladybirds, like all insects, respond to environmental change in different ways. Some species are expanding in range but many others are struggling. Understanding these patterns and trends is extremely important for informing conservation and decision-making. Many species of ladybird are beneficial, providing pest control of common garden and agricultural pests such as aphids and scale insects, and so it is important to consider the changing dynamics of these important species. How ladybirds are responding to climate change is another important aspect that the monitoring data will show.
Each illustration is so detailed, what is the process for reproducing a ladybird so accurately?
Detail and accuracy are the two most important considerations when producing illustrations for a field guide and working from actual specimens, rather than from photographs, is essential. Only then can measured drawings be made for correct anatomical details. Photos can be used as a supplement and museum specimens are also helpful if live material is unavailable.
With each book or field guide you hear of unexpected challenges. What was the biggest challenge in creating this field guide?
As the larval and pupal stages of ladybirds are quite short in duration, the main challenge for Richard was having to illustrate them as soon as he received them, often by post. The larvae also needed to be fed, at the same time ensuring the carnivorous species were kept apart, as many are cannibalistic. The inconspicuous species were the most challenging to illustrate as they are tiny, most around 2–4mm long, and covered in minute hairs, which often form diagnostically important patterns on their wing cases.
It has been such a pleasure to work together – we have all learnt from one another along the way. It has been inspiring to hear from Richard about the microscopic details of some of the little ladybirds that had previously gone unnoticed by us.
Helen E. Roy (Author)
Peter Brown (Author)
Richard Lewington (Illustrator)
Professor Helen Roy’s research at the Biological Records Centre focuses on the effects of environmental change on insect populations and communities, and she is particularly interested in the dynamics of invasive species and their effects on native biodiversity.
Dr Peter Brown is an ecologist and senior lecturer in zoology at Anglia Ruskin University in Cambridge. His research focuses on three main areas: ladybirds, non-native species and citizen science.
Standing a metre tall, with a wingspan approaching three metres, the Steller’s Sea Eagle is a magnificent and impressive bird.
Published in November, Richard Sale’s new book is the first English-language study of this bird of prey. A translation of an earlier Russian book written by Masterov and Romanov, the English version benefits from significant updates and a wealth of new photographs.
We recently chatted with Richard about the Steller’s Sea Eagle, his passion for birds and his love of the Arctic.
In your author biography you are described as a physicist with a PhD in astrophysics. Is physics still a part of your life or do you now devote all of your time to your writing and natural history studies?
Physics will always be a part of my life. I started out as a working physicist, at first as a glaciologist in Switzerland because they paid me to stay in the mountains where I could climb on my days off. Then I moved back to the UK to work. After a few years I left full-time employment and started a consultancy which allowed me to share physics with my love of birds and of snow and ice.
You obviously have a huge passion for birds, and you also spend much of your time studying Arctic ecology. Where did these twin passions come from?
The love of birds started with my father who was a birdwatcher. Our holidays were geared around the breeding season and we went to the moors rather than the beach. He taught me to really watch birds, not just to be able to name them but to able to understand their habits. My other love as a kid was climbing; at first rock faces, then mountains. The love of snow and ice and birds led naturally to wanting to visit the Arctic. After the first trip I really didn’t want to go anywhere else, especially as I am no lover of hot weather.
How did the collaboration for Steller’s Sea Eagle come about? Were you approached to work on the English version of the book or is it something that you yourself instigated?
I had visited Kamchatka in summer and winter and been in the field with Yevgeni Lobkov, one the experts on Kamchatka’s Steller’s. I subsequently went to Hokkaido several times to see the eagles on the sea ice. Then I found the Russian book and corresponded with Michael Romanov. That led to the idea of translating it into English, so I obtained the English rights from the Russian publisher. At first the idea was just to translate the Russian book, but by questioning Michael and Vladimir about sections of text, and then suggesting that we include my work on flight characteristics, the two of them suggested I should be co-author as the book was now looking substantially different from the original.
Can you describe your first sighting of a Steller’s Sea Eagle? How did it make you feel?
I mentioned Yevgeni Lobkov above. He and I took a trip along the Zupanova River in a Zodiac and I remember the first time a Steller’s came over us. It was low down and seemed to blot out the light because of its size. No one who sees a Steller’s can avoid being impressed and I was immediately enraptured.
I was intrigued to read that you have worked with a captive Steller’s Sea Eagle here in the UK. Can you tell us more about this experience?
Once in the Arctic, on Bylot Island, I was watching a Gyrfalcon hunting Arctic Ground Squirrels and because of the terrain, a narrow valley, I could see the falcon was not stooping in a straight line. That led to investigating the physiology of falcon eyes, and to designing a small unit with gps, tri-axial accelerometers, magnetometers and gyros (and other bits) to fly on falconry birds to study how they fly. I managed to get the weight down to a few grams – though that hardly mattered when I found someone flying a captive Steller’s in England as it weighed 5kg. It was flying the units on that bird that is in the new book. Atlas, the eagle, was flown in demonstrations for the public and allowed me to investigate wing beat frequencies, speed etc. It was great fun as he was such a docile bird, a real gentle giant, and being allowed to get so close to him was marvellous.
It seems that two of the main pressures on the Steller’s Sea Eagle are fossil fuel exploration from humans and predation from brown bears. Are there currently any population estimates for the species, and are you hopeful for their future survival?
The situation is not good. The company drilling for oil and gas have been helpful in taking enormous care over onshore works near breeding sites and are to be commended for that. But the fact is that, as human activities of all sorts have expanded close to Steller’s habitats (most of which are well away from the oil/gas exploration sites), the population has gone into decline. We can overcome bear predation by fitting anti-bear devices to trees. We can erect artificial nest and roost sites. But despite all of this, at the moment the population numbers are slowly coming down, probably as a result of global warming, though we are not yet definite about that. Hopefully the population will stabilise but only time will tell if our efforts have been sufficient.
Within a given year, how much time do you spend travelling and how much writing? Do you enjoy each part of the process equally?
Age is catching up with me now and so I spend less time in the Arctic than I did (when I could be there for many weeks during the breeding season). But I still get into the field regularly – particularly at the moment with my units flying on falconry birds and with studies on Merlins in Iceland, Scotland and Hobbies in England and Wales. But I also spend a lot of time in the library reading about birds and, sadly, the damage we are causing them through industrialisation and climate change. As everyone knows, there is hardly any money to be made nowadays as a writer of books on natural history and related topics, but I also enjoy the process of writing and preparing books for publication.
Another of your books, The Arctic, is due for publication in December. What’s next for you? Do you have another project in the pipeline?
That book is an updated, but shortened, version of one I produced some years ago with new photographs by myself and a Norwegian photographer I bumped into one winter out on the sea ice of Svalbard. We have made several journeys together since and stay in close touch as we share a love of the Arctic. The next will likely be an updated and expanded version of the one I produced on the Merlin. Merlins are my favourite raptor. Falcons are, in general, warm-weather birds. The exceptions are the Gyrfalcons, which are the largest falcons, the Peregrine (which lives more or less everywhere) and is also large, and the tiny Merlin. I am as entranced by these little birds making a living in the harshest climates as I am by the huge Steller’s.
Richard Sale is a physicist with a PhD in astrophysics, who now devotes his time to studying Arctic ecology and the flight dynamics of raptors. With Eugene Potapov he co-authored The Gyrfalcon monograph which won the US Wildlife Society Book of the Year in 2006. His other books include The Snowy Owl, Wildlife of the Arctic and the New Naturalist title Falcons.
NHBS’ staff members are wild about wildlife! To showcase this, we are encouraging our team to write blogs about their experiences with nature.
During the Summer months, Jon Flynn, a member of NHBS’ Wildlife Equipment Team attended a number of Waterway Surveys for Daubenton’s bats (Myotisdaubentonii). Read more about his survey experiences below:
“On Monday 6th July I took part in a Waterway Survey for Daubenton’s bat along a stretch of the River Teign in Devon. The survey is completed twice per year in conjunction with the Bat Conservation Trust and is part of an ongoing data collection programme for bat species around the UK. The lead for this particular survey was John Mitchell who has been surveying this particular length of the Teign, near Teigngrace, for a good number of years. It was my third survey there.
The survey was due to start 40 minutes after sunset, so we met at 9.00pm and made our way along the edge of a maize field to arrive at our first stopping point. This was to be a transect survey which meant walking a length of the river bank and stopping at ten predetermined points to record bat activity at each one. We stood at the river’s edge and immediately noticed that the river level was a lot lower than it was during our last visit a year or so ago. We recorded air temperature and cloud cover and, as we prepared, various species of bats could already be seen zooming around the trees and openings as they commenced another night of nocturnal foraging. The air was very warm, still and humid, and flying insects were everywhere including a host of moths and some less welcome biting species.
As the light faded it was time to start. With bat detectors switched on and earphones in place, we directed a torch beam on the river’s surface and awaited the arrival of the first Daubenton’s.
The Daubenton’s bat is a species which typically occupies riparian woodland. They often roost in trees along the river bank and hunt by skimming low over the surface of the water for insects. They can take prey from the water’s surface using their feet or tail membrane.
As bats skimmed through the torch beam we were able to count them. We counted the number of passes that we observed and for this a clicker counter is always useful! The bats that we heard but did not see were also recorded as additional information. I set my Magenta 5 at 50hz and listened whilst John relied on his trusty and more accomplished Bat Box Duet.
After four minutes on the stopwatch we finished counting, compared counts and wrote down results. At stop number 1 there were certainly bats present, but they were swooping around quite high above the water surface and not showing the typical behaviour of Daubenton’s – John was dubious that they were our target species so we recorded them only as potential sightings.
Using GPS devices and torches we left for Survey Point 2 further down the river bank and repeated the same process as before. At this location there was no denying that these WERE Daubenton’s bats, as the torch beam caught their pale almost white ventral fur, confirming their identity. Our detectors were full of noise too, including the typical intense zap as a bat homed in on prey.
On we progressed with eight more stopping points to go. Occasionally our river bank scrambles took us through thickets of invasive Himalayan balsam (Impatiensglandulifera) and Japanese knotweed (Fallopiajaponica)– a sobering reminder of how our countryside is changing. The night remained still and warm and it almost felt like we were in a different country.
After eight more stops my watch said 11:20pm. It was good to see that bats were in profusion that night, as John stated ‘It was one of the best ever totals, with one stopping point recording over 50 passes!‘.
Two weeks later and we repeated the process. But this second night felt noticeably cooler and there were fewer insects on the wing. Nevertheless bats were still out and about in reasonable numbers and an average score was calculated between the two Waterway surveys. Overall there were encouraging signs that the Daubenton’s bat continues to do well along this particular stretch of the Teign.”
To find out more information about the various bat detectors available, go to our website. To find out more about how you can help bats in your local area, have a look at our handy guide.
If you like the idea of taking part in Waterway Surveys (or other kinds of bat surveys) then contact the Bat Conservation Trust or have a look at their website here. It’s great fun and you can put your bat detector to important use!