Author interview with Stephanie Kim Miles: QGIS for Ecologists

QGIS for Ecologists book cover.QGIS for Ecologists teaches the fundamental stages of mapping land for ecological projects and reports and is ideal for those working in ecological consultancy and conservation, or for students with little to no training on the use of this software. Guiding the reader through the processes of basic survey mapping, aerial imagery, habitat mapping, designated sites and more, it provides a useful resource for anyone unfamiliar with the most accessible platform used to create maps for reports. 

Steph Miles portrait.

Stephanie Kim Miles works as a GIS Officer for the Bumblebee Conservation Trust, having previously worked as an ecological consultant specialising in ornithology. We recently had the opportunity to talk to Stephanie about how they first became interested in QGIS, the challenges they faced while writing a book on such a complex software and more.


Firstly, can you tell us a little about yourself and how you first became interested in QGIS? 

I studied Environmental Science at Lancaster University for my undergraduate degree. When I graduated, it seemed to me that all the cool jobs wanted you to know Geographical Information Systems (GIS). At the time, GIS was not being taught as part of degree programmes, so this was not a skill I had. I was lucky enough to find a role with the promise of being taught GIS on the job and I began working for a multinational engineering and environmental consultancy. I learned how to create maps and spatial analyses for Environmental Impact Assessments (EIAs) for port expansions and offshore renewables projects, particularly wind farms. Whilst studying for my Masters in Conservation and Biodiversity at the University of Exeter, I tutored fellow students in the use of GIS. When working in an ecological consultancy, I performed field surveys for protected species and used QGIS software for the first time to map the results for reporting. I also became one of the tutors for the course: Beginners QGIS for Ecologists and Conservation Practitioners for the Chartered Institute of Ecology and Environmental Management (CIEEM). I am currently working for The Bumblebee Conservation Trust (BBCT) where I use QGIS to map and analyse spatial data. I use QGIS to support the monitoring and evaluation of bumblebee conservation projects and to map bumblebee records for BeeWalk, a citizen science recording scheme. 

Figure 6.4 Protected Species Map from a Water Vole Survey.
Figure 6.4 Protected Species Map.

For those who might not know about this software, could you give us a brief overview of what QGIS is and its applications in relation to conservation? 

QGIS, as with other GIS software, is a computer programme used to visualise, analyse and map any data with coordinates. You do not need to know how to write computer code as the interface uses a mouse to click through menus, like in familiar Microsoft Office applications, for example.  

QGIS is free of charge making it accessible to those working in small consultancies and conservation charities. The software is open-source, meaning that anyone with the ability to code can write scripts called plugins to automate certain tasks. Fortunately, such coders exist within the ecological community! Particularly useful is the TomBio plugin written by Rich Burkmar and other contributors at the Forest Stewardship Council (FSC). The TomBio plugin enables you to import biological records and easily map them at a suitable scale for the data accuracy as points or grid squares at different scales (as you may have seen on the National Biodiversity Network (NBN)). 

In ecological consultancy, you need to access the impact of works on the habitats and species present and suggest mitigations and improvements. In conservation, you need to be able to access the site condition prior to conservation interventions, during and after habitat improvements and/or species work have taken place. Both ecological consultancy and conservation use similar processes to do this, such as the Ecological Impact Assessment (EcIA) reporting process. This consists of an initial desk study to find existing ecological data and environmental designations, followed by field surveys, the findings of which are written up in a report. At every stage, GIS can be used to map and analyse the data to provide the information and visualisation required for reporting. 

 

Figure 8.45 Advanced Habitats Map.
Figure 8.45 Advanced Habitats Map.

 

What inspired you to write this book for fellow ecologists? 

While developing the teaching materials for CIEEM courses I found I was essentially creating a textbook. I have continued to teach QGIS to colleagues and trainees while working in conservation, becoming more and more aware that a textbook would be really useful for me and those I was teaching. I felt that publishing a book would enable me to train more people in the use of GIS for ecology and conservation than I could on a one-to-one or class basis. I think it is really important that as many ecologists and conservation practitioners as possible can use GIS, I believe every project can be improved by understanding where everything is in relation to each other and creating beautiful, accurate maps to show it. 

This book starts with the basics of QGIS, working up to the creation of several types of maps. How did you decide on the breadth of this book and which tutorials to include?? 

I chose the tutorials to cover maps I have most frequently needed to produce for ecological reporting: a basic survey map, an aerial imagery survey map, a designated sites map, a desk-study map, a protected species map and a Phase 1 habitat map. As part of this you use UK sites and data, learn how to download free-to-use maps and datasets, georeference images and import GPX files into QGIS. Once you have worked through the tutorials, workflows are provided that you can follow with your own sites and data. I hope that having this refresher to refer to means you can maintain GIS skills in your own workplace, without having to reread the entire book to remember what you need to do.  

Figure 3.5 OSM map with grid.
Figure 3.5 OSM map with grid.

Did you face any challenges in creating an easily digestible guide for such complex software? 

Yes! When I first started training others and began writing down instructions for creating maps, I found that I would often leave out certain steps I was very familiar with. In person, teaching a class or one-to-one, I was there to provide any additional steps I had not written down. I knew that in writing the book I would need to make very sure that I had not missed anything! To do so I have spent a number of years perfecting the tutorials and data used to make it as streamlined and clear as possible. 

Another challenge has been the changing nature of data availability, sources and copyright, as well as software updates that all make the processes work slightly differently. I have worked hard to ensure, as much as possible, that the workflows will remain current even if external data sources change. 

Chapters 5–11 contain exercises for readers to undertake to improve their understanding of the subject and enhance their learning experience. Can you briefly describe how you created these and explain why you feel practical exercises were important to include? 

Part 1 includes Chapters 1–3 and provides a summary of the book, an introduction to myself and to QGIS. The practical Part 2 begins at Chapter 4 with instructions for downloading QGIS and the data needed for your first maps. The exercises for producing maps are in Chapters 5–11. Part 3 contains the answers to the exercises in Chapter 5–11. Part 4 is Chapter 12 with the workflows for each maps produced in Chapter 5–11, so you can easily refer back to how each map was made, without having to reread the exercises again. 

I wanted to include exercises aimed at creating maps that ecologists need to produce for reports. As GIS is a practical skill, it was very important to me that, as soon as possible within the book, you are able to create your first map. I have found that it is important to be able to produce maps while learning the basics of GIS. This helps to build confidence in what you are doing and see the results of your learning quickly. I hope that making several types of map, starting simply and ending up with the most complex, makes it easy to follow and it is clear how you will apply the skills you are learning to your work.  

Will you be working on any more projects like this in the future?  

I hope to write a follow-on book about the use of QGIS and QField for data capture in the field using tablet devices. 

QGIS for Ecologists book cover.

QGIS for Ecologists is available to pre-order from the NHBS bookstore

Q&A with Pete Haskell: Celebrating 60 Years of the Scottish Wildlife Trust

A headshot of a man in a blue tshirt smiling at the camera. The Scottish Wildlife Trust is the leading charity seeking to protect and restore the diversity of the Scottish landscape and its species. Based in Edinburgh, this membership-based organisation has a key role in the conservation of over 90,000 species through practical work, campaigning, education and management in over 100 wildlife reserves. 

The Scottish Wildlife Trust will be celebrating their 60th anniversary this year, marking the occasion with their storytelling campaign Words of the Wild. We recently spoke to Pete Haskell, Head of Communications and Engagement, on the work of the Scottish Wildlife Trust, its iconic projects and their goals moving forward.  


Visitors on Handa Island Wildlife Reserve. Image by Pete Haskell, The Scottish Wildlife Trust

Could you give us a brief introduction to the Scottish Wildlife Trust and how it was formed? 

Today, the Scottish Wildlife Trust is Scotland’s leading nature conservation charity, but it all began as a small group of passionate people in Edinburgh 60 years ago.  

It was in 1964 that Sir Charles Connell, along with a handful of others, decided to establish an organisation whose focus was the protection of Scotland’s wildlife for the benefit of present and future generations. Despite being run on a shoestring budget, within a year the Trust had 400 members and a long list of volunteer members of Council that included several professors, a general, several prominent landowners, a museum curator, the presenter Tom Weir and representatives from the Forestry Commission and The Nature Conservancy. 

By the end of 1966, the Trust had acquired its first three wildlife reserves, and its work has continued to grow in breadth and scale ever since.

 

Could you tell us about the aims of the Trust, and what kind of work you undertake? 

The Trust’s vision is of a network of healthy, resilient ecosystems on land and sea, supporting Scotland’s wildlife and people something we’ve been pursuing for our 60-year history with support from our members, partners and volunteers. 

The Trust successfully champions the cause of wildlife through policy and campaigning work, demonstrates best practice through practical conservation and innovative partnerships, and inspires people and communities to take positive action through education and engagement activities. We also manage a network of over 100 wildlife reserves across Scotland, welcome visitors to our three visitor centres at Montrose Basin, Loch of the Lowes and Falls of Clyde, and are a member of the UK-wide Wildlife Trusts movement. 

Community Engagement Work. Image by Pete Haskell, The Scottish Wildlife Trust

 

What have been the most iconic projects for the Trust over the years? And could you tell us about your biggest challenges and successes? 

Where to start! As an organisation that covers all of Scotland and all of its wildlife, we’ve been involved in a huge variety of projects over the last six decades.

In the 1980s, we had a big focus on acid rain, organising an international conference that brought together a wide range of experts to discuss the major points of evidence around the issue and the damage it causes. This resulted in delegates agreeing a detailed resolution that called for the UK Government to take decisive and immediate action to combat acid rain. 

In the 1990s, one of our major focuses was peatland restoration. As well as leading a peatland campaign that raised awareness of the importance of the habitat and its wildlife, we worked in partnership with Scottish Natural Heritage (now NatureScot) to undertake one of the most comprehensive assessments of any habitat in Britain and published a peatland management handbook used by land managers across Europe. 

In the 2000s, we started two of our most iconic species-focused projects. In 2008, we partnered with the Royal Zoological Society of Scotland to lead the five-year Scottish Beaver Trial in Knapdale, a groundbreaking project that saw the first formal reintroduction of a mammal anywhere in the UK. And in 2009, we established Saving Scotland’s Red Squirrels, a partnership project that continues to this day to protect our native Red Squirrel population. 

The past decade or so has seen some of our most ambitious projects to date. Our Living Landscape initiatives in Coigach and Assynt, Cumbernauld and Edinburgh are working to deliver environmental, social and economic improvements on a landscape scale. Through our Living Seas project, we have created a network of snorkel trails across Scotland to encourage more people to experience the incredible marine life that Scotland’s seas are home to. And most recently we have been progressing our Riverwoods initiative which is set to accelerate the creation of woodland habitat along Scotland’s extensive river network.  

Snorkellers. Image by Alexander Mustard for The Scottish Wildlife Trust.

 

What are your hopes for the future? How do you think the Trust’s goals will change past Strategy 2030? 

Our firm hope is that we begin to see nature recovery on a national scale. We have 60 years of impactful conservation behind us, but nature is in a state of crisis, with one in nine Scottish species threatened with extinction. As our life support system, nature is vital to every one of us and it will take everyone – from decision makers to community groups – to help turn the tide on nature loss. 

But even if we can get over that biggest of hurdles – where nature is no longer declining and starts on an upward trajectory – there is a huge amount to do. With the UK one of the most nature-depleted countries in the world, the road to achieving our vision is a long one. There will inevitably be new challenges to overcome but the thing that unites the Trust – our staff, volunteers, members, donors and partners – is an unenduring passion and love for nature. They say you can have too much of a good thing, but when it comes to nature, that’s just not the case! 

 

Sixty years of educating, campaigning and protecting nature is an incredible milestone. How will the Trust be celebrating this important anniversary? 

Whilst there are many things going on across the Trust to celebrate our 60th anniversary, the major focus is our storytelling campaign, Words of the Wild. The campaign has three strands: a series of events focusing on the stories of some of our reserves; a new and very recently launched podcast series that will explore the stories of the Trust’s past, present and future; and a nature writing competition that encourages others to share their stories of Scotland’s wildlife and wild places in no more than 1,000 words. The competition has an adult and a junior category and is open until 31st August. There are some fantastic prizes for the winners, including some generously donated by NHBS, for which we are very grateful. 

If readers would like to find out more about the Trust or enter the Words of the Wild competition, visit scottishwildlifetrust.org.uk/  

 

How Can We Use Sound to Measure Biodiversity? – Webinar Round-up

In July, the Biological Recording Company held the first of three webinars on bioacoustics in conservation. These webinars, which are presented in partnership with Wilder Sensing, Wildlife Acoustics and NHBS, began with a general introduction to bioacoustics, and will be followed with two sessions later in the year discussing the technology in more detail. 

In the first webinar, talks by Geoff Carss of Wilder Sensing and Joe Hampson from the Somerset Wildlife Trust provided listeners with an overview of bioacoustic technology, its applications in measuring diversity and a short story of Honeygar farm, the Trust’s first ‘wilded’ site. NHBS are pleased to have sponsored this webinar, and we would like to thank participants who took part in our prize draw to win a Song Meter Micro 2. 


Wilder Sensing: An entry-level introduction to bioacoustics 

Bioacoustics provides ecologists and conservationists with an auditable, low-cost technology to measure biodiversity. It involves the use of audio recorders to passively detect sound in an environment, which can then be analysed to provide insights into community assemblage.   

This technology can be used to measure several environmental variables, including animal presence, soil health, weather and infrastructure. Long-term monitoring of an environment can provide us with new insights on the richness and species density of an area and can even be used to analyse migration of key groups. Analysis can also determine areas of interest and habitat preferences for certain species, which can be used to inform future land management.  

This method removes bias from traditional surveying techniques, where the skill and age of the observer, or sometimes even the day itself, can impact the result of a traditional survey. However, there are some limitations associated with this technology. False positives (the technology can misidentify a species), false negatives (the technology might miss a call), poor sound quality and mimicry can impact the accuracy of recorded data. To capture an accurate picture of community assemblage, passive recording is best used in partnership with traditional site surveying. This way, disturbance and false negatives can be mitigated, and through bioacoustic surveys, we can revisit the recordings as technology develops.  

An acoustic sensor deployed at Honeygar Farm. Image by Wilder Sensing.

Key points:  

  • Bioacoustic technology provides additional insights into community assemblage through the use of sound  
  • The technology is best used alongside traditional surveying for a more accurate overview 
  • The technology is limited by sound quality, false positives and false negatives. 

 

Somerset Wildlife Trust: Honeygar Farm Case study 

Honeygar Farm is an 81-hectare site of former intensive farmland, now owned by the Somerset Wildlife Trust (SWT). Since acquiring Honeygar, SWT have employed a unique ‘wilded’ approach to restoring the site. 

Changes in hydrology management were among the biggest alterations at Honeygar, as the site has been subject to intense peat drainage to make way for agriculture. Honeygar has over two metres depth of peat, equivalent to 100,000 tons of carbon dioxide, so restoring the natural peatland by blocking drainage ditches was key to improving the carbon storage on site. Cutting and grazing by cattle, historically a huge pressure, has also been reduced from a herd of around 140 animals to 40 individuals. This, partnered with limited silage cutting and resting fields from grazing, is encouraging recovery of the botanical communities on site. The Trust is also exploring the use of different ungulates, including goats, ponies and different cow breeds, to better support the wetland habitat.  

Over 20 months, nearly 13 million records were gathered using four sensors on site. This monitoring was undertaken alongside breeding bird, wintering bird and breeding wader surveys to provide a more detailed picture of community assemblage, confirmed with manual validation and targeted surveys to assess rare bird presence. Honeygar will continue to be monitored for insects, birds, mammals, fungi and plants to inform future management practices. 

Speaker Joe Hampson deploying acoustic recorders on site. Image by Wilder Sensing.

Key points: 

  • Honeygar Farm is the Trust’s flagship site for the ‘wilding’ approach 
  • Formerly an agricultural farm, Honeygar is being restored to its natural peatland habitat through alterations in landscape management 
  • Bioacoustic technology has provided insight into the community assemblage at the farm, helping to inform landscape management.  

This webinar was an enlightening insight into bioacoustics and highlighted some interesting points on its conservation applications. Read our Q&A with Geoff to hear more about Wilder Sensing and its technology, and find more details on Honeygar on the Somerset Wildlife Trust website.  

Find tickets for the next webinar, ‘Can Passive Acoustic Monitoring of Birds Replace Site Surveys?here. 

The NHBS Guide to UK Common Garden Beetles

Beetles are insects that form the order Coleoptera, meaning ‘sheath-winged’. They get their name from the adaptation of their front wings which have formed tough protective cases called elytra.  This gives them an armour-like appearance while protecting the delicate wings underneath.  

As one of the most diverse groups across the world, there are over 400,000 species – more than 4,000 of these can be found in the UK. In this post we will look at some of Britain’s beetles, detailing their key features and where to find them.  


 Rose Chafer (Cetonia aurata 

Rose Chafer by Hedera Baltica via Flickr

Conservation status: Common 

Distribution: Widespread across the UK, but scarce in number. Most common in southern England. 

Identification: This large beetle is instantly recognisable by its iridescent emerald green carapace. Up to 2cm long, this broad beetle will often have white streaks across its wing case, which can occasionally appear purple or bronze in colour. The underside is covered in fine, pale hairs and there is an obvious ‘V’ shape on its back where the wing cases meet. 

Where to find them: Grassland, woodland edges, scrub and farmland. Rose Chafers can also be found in towns and gardens, where they are considered a pest. You can find them between May and October when they can be spotted in sunny weather.  

  

Cock Chafer (Melolontha melolontha) 

Image by Frank Vassen via Flickr

Conservation status: Common 

Distribution: Widely distributed across the UK, more common in the south of England. 

Identification: The UK’s largest scarab beetle, the Cock Chafer can grow up to 4cm in length. It has rusty brown wing cases with a black body and brown legs. Its underside is covered in fine, pale hairs and it has a pointed tail. It has distinctively large, fan-like antennae that can be used to distinguish the sex – males have seven feathers and females have six. 

Where to find them: Meadows, farmland, grassland, woodland, heath and moorland, and gardens from April to July. These insects are mostly seen after sunset, where they can be found near streetlights and bright windows.  

 

Stag Beetle (Lucanus cervus) 

A large, black and maroon coloured beetle standing on a piece of wood.
Image by Ben Sale via Flickr

Conservation status: A globally threatened species, the Stag Beetle is listed as a priority species in Schedule 5 of the Wildlife and Countryside Act 1981.  

Distribution: Nationally scarce. This species is mainly found in south-east England. It is most abundant in the Thames Valley and Hampshire and is locally common in some areas of the south-west.  

Identification: A spectacular insect, the Stag Beetle is recognised for its antler-like mandibles. Males can grow up to 8cm, while the females grow to 5cm and have smaller mandibles. Both have a shiny black head, thorax and legs with chestnut-coloured wing cases.  

Where to find them: They can be found from mid-May to late July in woodland, hedgerows, parks and gardens. Although usually found on the ground, males can be seen in flight during sunset on hot summer evenings.  

 

Lesser Stag Beetle (Dorcus paralellapipidus) 

Image by Guy-F via Flickr

Conservation status: Common 

Distribution: Found throughout England and Wales. 

Identification: Smaller than their threatened cousins, the Lesser Stag Beetle grows up to 3cm in length and can be distinguished by smaller mandibles and knobbed antennae. Although similar in shape and colour, this species has a broad head and matt black wing cases.  

Where to find them: Hedgerows, woods, farmland, grassland, towns and gardens from May to September. They can often be found basking in the sun on tree trunks and can be seen flying near bright lights at night. 

 

Rosemary Beetle (Chrysolina americana) 

Image by Katja Schulz via Flickr

Conservation status: Common 

Distribution: Widespread in the UK, particularly in south-west England. Distribution is patchier in Wales, Scotland and Northern Ireland.  

Identification: A small, shiny beetle growing up to 1cm in length, the Rosemary Beetle is a striking metallic green with orange and purple stripes. The head and thorax are mostly green with some red markings, and the legs are a brown-red.  

Where to find them: Rosemary Beetles are found year-round but are commonly spotted between April and September. The species is closely associated with Lavender, Thyme and Rosemary. 

 

Wasp Beetle (Clytus arietis) 

Image by Frank Vassen via Flickr

Conservation status: Common 

Distribution: Widespread across the UK, less common in Scotland.  

Identification: A narrow-bodied longhorn beetle, this species has a long, black body with yellow horizontal stripes. The Wasp Beetle has short brown antennae and brown legs. 

Where to find them: Wasp Beetles can be found in farmland, woodland, hedgerows, parks and gardens between April and July.  

 

Red Soldier Beetle (Rhagonycha fulva) 

Image by Hedera Baltica via Flickr

Conservation status: Common 

Distribution: Widespread in the UK. 

Identification: Growing up to 1cm in length, the Red Soldier Beetle is small and narrow. It has a rectangular body that is a vibrant orange red with black tips to the wing cases. Their orange legs are tipped with black feet and they have long antennae.  

Where to find them: This species can be found from June to August, usually on open-structured flowers such as daisies and Cow Parsley, in grasslands, hedgerows, woodland, parks and gardens.  

 

Red-headed Cardinal Beetle (Pyrochroa serraticornis) 

Image by Frank Vassen via Flickr

Conservation status: Common 

Distribution: Widespread in England and Wales. 

Identification: A mid-sized beetle growing up to 2cm in length, the Red-headed Cardinal Beetle has a vibrant orange-red head and wing case. Its legs and antennae are black, the latter long and toothed.  

Where to find them: Adults can be found in woodland, hedgerows, farmland, parks and gardens from May to July. 

 

Devil’s Coach Horse Beetle (Staphylinus olens) 

Image by Frank Vassen via Flickr

Conservation status: Common 

Distribution: Widespread in the UK. 

Identification: The Devil’s Coach Horse, easily recognised by its scorpion-like stance when threatened, is a medium-sized black beetle growing up to 3cm in length. It has large, powerful jaws and a long, thick abdomen. The body is covered in fine black hairs and the wing cases are very short.   

Where to find them: Devil’s Coach Horse Beetles can be found from April to October in hedgerows, grassland, farmland and gardens. They require damp living conditions and are often found under stones and in compost heaps. 

 

Violet Ground Beetle (Carabus violaceus) 

Image by Guy-F via Flickr

Conservation status: Common 

Distribution: Widespread in the UK. 

Identification: Growing up to 3cm in length, the Violet Ground Beetle has a distinctive metallic violet colouring running along the edge of a black thorax and smooth wing cases.  

Where to find them: Violet Ground Beetles can be found from March to October in woodland, grassland, moorland and urban areas. They are frequently found under logs and stones.   

This Week in Biodiversity News – 5th August

Environment  

The number of plastic bags found on beaches has reduced by 80%. Since mandatory charges were introduced in the UK, data recorded by the Marine Conservation Society’s annual litter survey has recorded a marked decrease in the number of bags found on UK beaches –  last year the survey recorded an average of one plastic bag every 100m, down from five in 2014.  The discovery has led to calls for action to further reduce other types of marine litter.  

A single diver swimming across a bed of bleached coral. The coral is very branched, and pale white.
Coral Bleaching. Image by The Ocean Agency/XL Catlin Seaview Survey/Richard Vevers via Flickr

The world’s reefs are in the middle of the most widespread heat event since records began. After 18 months of record-breaking temperatures, reefs in over 70 countries have been impacted and over 73% of reefs have experienced temperature extremes high enough to initiate bleaching. This event is the second recorded in the last ten years and is the fourth global coral bleaching event on record. Reef conservationists and researchers are urging the scientific community to rethink ways to tackle these events, and are calling for the redoubling of efforts to reduce other stressors on reef habitats.  

 

Discoveries 

Chimpanzees have been observed turn-taking during conversation. Researchers have followed five groups of Eastern Chimpanzees (Pan troglodytes schweinfurthii) in Tanzania and Uganda, recording the chatter between groups. The team recorded over 8,500 gestures used in back-and-forth conversation, finding a response time of around 200 milliseconds – the same time as observed in humans. Gestures involve hand flicking to shoo others away and stretching of hands to ask for food. Researchers believe that, in this species, gestures do the talking, while facial expressions and vocalisations add tone to the conversation.  

A chimpanzee is resting its hand under its chin. It is looking thoughtfully towards the sky with the sun on its face
Image by Vanessa via Flickr

Brazilian wild sharks have tested positive for cocaine. Previous studies have found traces of cocaine in rivers, seawater, wastewater, and smaller marine organisms such as shrimp and mussels, causing serious toxicological effects. However, the concentration observed in Rio’s sharks is around a hundred times higher than other animals testing positive for this substance. The contamination source is currently unknown but is thought to have originated from losses during shipment or the dumping of narcotics to evade authorities. Particularly worrying, the Brazilian Sharpnose Sharks (Rhizoprionodon lalandii) analysed in this study are a component of the Brazilian diet, and it is not yet known how this contamination could impact humans. 

 

Conservation  

A near extinct species of crocodile is making encouraging progress in Cambodia. In June, sixty Siamese Crocodiles (Crocodylus siamensis) hatched, following the discovery of five nests in May; a rewarding result from nearly two decades worth of conservation efforts in the Cardamom mountains. Once widespread, these animals have been subject to hunting and habitat loss, resulting in their classification as critically endangered . Since 2012, a collaborative programme by local officials and Fauna & Flora has successfully released nearly 200 individuals, helping to maintain the global population which currently sits at around 400. 

A large, black crocodile is laying on the floor in a patch of bark surrounded by small plants
Image by tontantravel via Flickr

Butterfly numbers in the UK are the lowest on record. An unusually wet spring and summer has dampened mating opportunities for butterflies across the country, resulting in a dramatic decrease in populations. With populations still struggling to bounce back from 2022’s drought, the wettest spring since 1986 has further prevented butterfly recovery across the country. Populations are at the lowest recorded since Butterfly Conservation’s Big Butterfly Count began 14 years ago, and as a key indicator species for habitat health, the findings are particularly troubling for the wider environment.

There has been a surge in ‘starving’ bats in Britain. Conservation groups have reported an increase in malnourished, underweight bats and fewer individuals overall for this time of year. A wetter-than-average spring and summer have negatively impacted insect, butterfly and moth populations, resulting in a blow to food sources for these animals. With nursing mothers unable to feed their young, volunteer organisations caring for bats are also seeing a surge in admissions. 

Grey long eared bat flying with wings spread at night with leaves in the background
Grey Long-eared Bat via iStock

 

The NHBS Guide to UK Solitary Bees

There are around 270 bee species in the UK, and over 90% of these are solitary – they do not nest in colonies, do not produce honey and don’t have a queen. Instead, these bees lead solitary lives, only coming together to mate. The group can be divided into ground-nesting species, found on lawns, paths and loose soil, or aerial nesters which utilise hollow plant stems, dead wood and man-made bee hotels to build a nest for larval bees. 

Here we look at a small selection of these important pollinators found in the UK, outlining ways in which they can be identified and where they can be found.  

Mason Bees 

Mason bees is the name used to refer to bees of the genus Osmia. There are around 500 different species of mason bee across the world, and around 20 of these can be found in the UK. This group gets their name from their use of mud or clay in nest building, which takes place in naturally occurring gaps or cracks, and other small, dark cavities. Some species of mason bee will also use hollow stems or bore holes made by wood-boring insects.

Red Mason Bee (Osmia bicornis)  

Two small, orange bees are sat on a head of purple flowers. One is sat on top of the other bee.
Osmia bicornis by Tim Worfolk, via Flickr.

Distribution: Widespread and common throughout England and Wales. Rarer in Scotland. These bees can be found from early spring in grassland, farmland, towns and gardens. Red Mason Bees are common in built environments and are often seen nesting in the crumbling mortar of old walls. This species is also a common inhabitant of bee hotels.

Identification: These fluffy bees grow up to 1.1cm long and are typically identified by dense, gingery hair. On both males and females, the head and thorax are brown with an orange abdomen. Males are typically smaller than their female counterparts and have a distinctive white tuft of hair on the head. Female Red Mason Bees have dense orange hairs on the abdomen, with pollen collecting hairs on the underside. This species also has a pair of short, distinct horns on the head.

 

Red-tailed Mason Bee (Osmia bicolor) 

Red Tailed Mason Bee on a wooden fence with four holes drilled in it.
red tailed mason bee by Nick Goodrum, via flickr.

Distribution: Nationally rare in the UK. Red-tailed Mason Bees can be found from March to July in the south and east of England and south Wales. This species occurs exclusively on calcareous grassland over chalk or limestone, in quarries, grassland and brownfield sites.  

Identification: This species has dense, black hair on the head and thorax. Bright orange-red hair is present on the abdomen and the lower legs, forming stripes of orange and brown on the upper abdomen. Males are slimmer and less vibrant than females, and can have pale, duller brown hairs on their head, thorax and abdomen.

 

Mining Bees 

Sometimes referred to as digger bees, this group are named after their burrowing behaviours in which they create their nests. There are roughly 65 species in the Andrena genus, making mining bees the largest bee genus in Britain.

Tawny Mining Bee (Andrena fulva)

A female tawny mining bee on a leaf.
A female Tawny Mining Bee (Andrena fulva) by Lukas Large, via flickr.

Distribution: Widespread and common in England and Wales. Populations are growing in Scotland. This species can be found in farmland, heathland, parks, towns and gardens from March to June.

Identification: Similar in size to a honeybee, with dense orange hair and a black face. Females tend to be larger and have a thick, orange coat covering the upper thorax and abdomen. The underside is covered with black hair, along with the head and legs. Males are trickier to identify but are generally smaller and slimmer. They have long mandibles and are browner in colour, but can be distinguished by white tufts of facial hair on the head.

 

Ashy Mining Bee (Andrena cineraria)

Ashy Mining Bee on a ribbed, green leaf.
Andrena cineraria by Tim Worfolk, via flickr.

Distribution: Common and widespread across Britain and Ireland. Can be found nesting in gardens, woodlands, riverbanks and urban environments from March to July. 

Identification: A distinctive bee growing up to 15mm in length. Females have two, broad grey bands at the top and bottom of the thorax. The abdomen is sparsely haired, revealing a glossy black exoskeleton and the legs are covered with dense black hair. They also have a patch of ashy grey hair on their faces. Males have similar markings but are generally smaller in size. The bands are less distinct, and they have a spread of grey hair across their thorax. 

Leafcutter Bees

Named for their nesting habits, these bees are known to cut circular leaf pieces to use as building material for their nests. Leafcutter bees lay their eggs in natural tree cavities where they use up to 40 pieces of harvested leaves and petals to create a chamber for safe incubation. There are seven different species of leafcutter bee in the UKthey can be found nesting in beetle holes, plant stems, deadwood, cliffs or old walls.

Patchwork Leafcutter Bee (Megachile centuncularis) 

Megachile centuncularis harvesting pollen from a pink flower.
Megachile centuncularis by Gilles San Martin, via flickr.

Distribution: Widespread and common throughout the UK, although less common in the north. Patchwork Leafcutter Bees can be found in a range of habitats from April to August, including grassland, farmland, woodland, towns and gardens. This species is strongly associated with willowherbs, honeysuckle and roses.  

Identification: Easily identified by the vibrant yellow-orange pollen brush under the abdomen, extending right to the tip. This species is a similar size to honeybees, growing up to 13mm. The female has defined white bands across the abdomen. Males are more challenging to identify – similar in appearance to a dark honeybee, with the characteristic vibrant underside and tan coloured hair around their thorax.

 

Willughby’s Leafcutter Bee (Megachile willughbiella) 

Megachile willughbiella female bee on the petal of a pink flower.
Megachile willughbiella female by Line Sabroe, via flickr.

Distribution: Common and widespread across Britain. Frequently observed in brownfield sites from June to August. This species is also readily found in bee hotels.

Identification: Up to 18mm in size, Willughby’s Leafcutter Bees are similar in appearance to Patchwork Leafcutter Bees. They appear similar to dark honeybees, with little hair. The species varies in shades of black, with orange and gold throughout the coat and an orange pollen brush. Males can be distinguished by oversized front basitarsi, giving the appearance of white, wooly mittens.

The NHBS Guide to UK Shore Crabs

A charismatic highlight of any rock-pooling session, crabs are both diverse and wonderful. Here we have a selection of the most common crabs in the UK, detailing their habitats and how to identify them. 


Velvet Swimming Crab (Necora puber) 

Image by Guy F via Flickr

Conservation status: Common, non-threatened. 

Where to find them: The species is widespread throughout the UK and can be found year-round on rocky shores at low water. They are found more frequently on sheltered shores and prefer rocky substrates.  

Shell Width: Up to 10cm.  

ID: Also known as the devil crab, the Velvet Swimming Crab has short hairs covering its body, giving the animal a velvety appearance. The crab is blue in colour, but is covered by a reddish-brown pubescence masking the overall hue – they do, however, have visible blue lines on their legs, and blue tips on their claws. The carapace is flattened and has five pointed ridges on either side of the eyes. A fast-moving and aggressive crab, it has distinctive, bright red eyes that give it its alternative name. Pincers are of equal size, and the rear legs are flattened to be used as paddles.  

 

Edible Crab (Cancer pagurus) 

Image by Guy F via Flickr

Conservation status: Common, non-threatened. 

Where to find them: Edible Crabs can be found year-round on rocky shores across the UK. The species is often found hidden under rocks and boulders but can also be found on mixed coarse ground and on muddy sand offshore.  

Shell width: 10-25cm, averaging around 15cm.  

ID: A large species, the Edible Crab is also known as the brown crab for its colour – they can be brown to reddish-brown, bearing white patches and young specimens can have a purple-brown carapace. They have a thick, oval-shaped shell with a distinctive ‘pie crust’ edge. Also recognised by the black tips to their claws.  

 

Spiny Spider Crab (Maja brachydactyla)  

Image by Guy F via Flickr

Conservation status: Common, non-threatened. 

Where to find them: Spiny Spider Crabs, also known as European spider crabs, can be found from January to December on rocky areas. They are common on the south and west coasts, but are largely absent from northern England, Scotland and the North Sea.  

Shell width: Up to 20cm. 

ID: Known to be the largest spider crab in Britain and Ireland, they are instantly recognisable for their long legs resembling a spider. They have a distinctively spiky carapace, often covered with algae giving it a hairy, green appearance. The shell has an oval shape, broader at the back and narrower at the front. It has longer, more pronounced spines on the border of the shell, and the rest is covered by smaller spines. They are mostly orange in colour, but have been found in red, yellow or brown varieties.  They have two distinct frontal spines which are sandwiched by two small eyes. The legs are covered in hair, with the first pair bearing small claws.  

 

Common Hermit Crab (Pagurus bernhardus) 

Image by Guy F via Flickr

Conservation status: Common, non-threatened. 

Where to find them: Common Hermit Crabs can be found year-round on rocky shores and sandy substrates along the UK coast. They are most easily found in rock pools at low tide, particularly after storms and turbulent weather, where they can be dislodged and are more easily visible.  

Shell width: Varies according to body size, which can measure up to 4cm in length. 

ID: The largest and most common of the 15 hermit crab species, these crabs live inside the empty shells of sea snails, commonly whelks and periwinkles. Their body is reddish-brown in colour, with a larger right pincer. Their claws are strong, and are covered in uniformly distributed granules, with two rows of larger granulations starting at the base of the claw, converging towards the middle. The species is associated with Calliactis parasitica, a sea anemone which lives on their shell in a symbiotic relationship.  

 

Shore Crab (Carcinus maenas) 

Image by Guy F via Flickr

Conservation status: Common, non-threatened. 

Where to find them: Shore Crabs are found year-round in rockpools. They may also be found while crabbing in shallow waters and are particularly abundant in estuaries and salt marshes.  

Shell width: Up to 9cm. 

ID: The species is slightly green in colour, but can also be found with orange and red carapaces and yellowish spots on the abdomen – varied colouration can be attributed to life cycle stages, and juvenile Shore Crabs specifically can have significant variance in colour. The broad carapace has five teeth on each side of the shell, and three scalloped lobes between the eyes.  

 

Masked Crab (Corystes cassivelaunus)  

Image by Guy F via Flickr

Conservation status: Common, non-threatened. 

Where to find them: A small burrowing crab, the Masked Crab can be found buried in sandy substrates on the lower shore. They are found along most of the British coastline and are particularly abundant in the south and west of the UK. 

Shell width: Up to 4cm. 

ID: Masked Crabs have an elongated oval carapace with long antennae, often the size of their body. Their colour can range from reddish brown to yellow and the lateral margin of the carapace has four distinct spines. The claws are twice the length of the carapace, although females have smaller pincers.  

 

Broad-clawed Porcelain Crab (Porcellana platycheles) 

Image by Guy F via Flickr

Conservation status: Common, non-threatened. 

Where to find them: Can be found January to December across the UK, although with sporadic distribution. They can be found under rocks and small boulders on rocky shores.  

Shell width: 1.5–1.8cm. 

ID: A small crab covered with long hairs, the Porcelain Crab can be grey to greenish-brown with an off-white underside. They have large, broad front claws that appear to be slightly flattened and two long antennae. The fifth pair of legs are smaller and often concealed, resulting in the illusion of only three pairs of walking legs. Due to its size and impressive camouflage, this species can be hard to spot.  


It can be truly fascinating to sift through rock pools, finding the weird and wonderful creatures that our environment has to offer, but it is important to remember best practices when investigating our wildlife. To look for crabs safely, approach them from behind to avoid pincers, opt for a net for safe retrieval and hold the crab firmly, without squeezing, to ensure that it does not fall whilst handling. When you are finished, remember to leave everything where you found it, replace any rocks that you may have turned over during your search and return crabs to the same body of water you found them in.  

Book review: The Killer Whale Journals

The Killer Whale Journals Book Cover.***** A balanced and non-judgemental account of people’s differing attitudes

As some of the world’s largest predators, orcas are both loved and loathed, though these sentiments sometimes come from unexpected corners. Danish marine biologist Hanne Strager has studied orcas and other whales for some four decades, working with a wide range of people. In The Killer Whale Journals, she plumbs the complexities and nuances of people’s attitudes, writing a balanced, fair, and thought-provoking insider’s account. Given the preponderance of research and books on Pacific Northwest orcas, hers is a refreshingly cosmopolitan perspective, taking in the experiences of people past and present in many other parts of the world.

Strager’s involvement with whale research started on a whim when she volunteered as a cook on a small research vessel going around the Lofoten Islands in northern Norway. This was in the 1980s and would, with some interruptions, be the start of a career in research and education that lasts to this day. Though she is fully qualified to write a scholarly work on orca biology, this is not that book. Rather, this is “a patchwork of stories I have collected over my years on the ocean about our relationship with the biggest predator on Earth” (p. 17). And what a wide-ranging, multi-hued patchwork it has become!

Born Free by Christopher Michel, via flickr.
Born Free by Christopher Michel, via flickr.

Some of these relationships are as you would expect. In her early days in Norway, both the whalers and fishermen she spoke to disliked orcas, considering them a pest species that frightens away other whales and eats all the herring. Similarly expected is the strong respect expressed by First Nations people in British Columbia. Other people hold attitudes you would not expect, breaking with stereotypes. When Scottish whalers emigrated to Twofold Bay, New South Wales, Australia in the mid-1800s, they continued the cross-species relationship established by the Aboriginal Thawa tribe, leading to an unlikely, century-long alliance between orcas and whalers. At the other end of the spectrum, Strager visits Inuit hunters in Greenland who continue to rely on the sea for their sustenance. They kill orcas on sight, convinced they eat narwhals. However, data from the Greenland Institute of Natural Resources do not back up this assertion: orcas rarely share the waters with narwhals, nor have narwhal remains been found in their stomachs. Hunting organizations disagree and stick to their narrative, continuing to kill orcas even though the meat is unsuitable for human consumption due to high levels of bioaccumulated pollutants. Strager is loathe to judge these people given their hospitality and willingness to talk to her, but she candidly admits that she is left troubled.

What further contributes to the book’s full-bodied picture is that Strager, as a Danish scientist, provides a non-US-centric perspective and has access to material written in other languages. With the help of a friend, she translates hundreds of newspaper articles from Iceland’s National Archive to puzzle together the story of how the US Air Force got involved in massacring orcas here in the 1950s, doing bombing raids on pods. Being plugged into the Scandinavian research community, Strager can furthermore draw on her connections to visit and speak to people in Denmark, Greenland, Russia, and various places in Norway.

Killer Whale (Orcinus orca) by Gregory "Slobirdr" Smith, via flickr.
Killer Whale (Orcinus orca) by Gregory “Slobirdr” Smith, via flickr.

Increasingly, the demonization of orcas has made way for a different understanding, seeing these as intelligent mammals, not unlike us. A new generation of fishermen in Norway is less hostile. The extra income generated by wildlife tourism and whale watching does not hurt, but, adds a Norwegian marine ecologist, there is also a sense of pride in one’s local patch. Having tourists visit from around the world and witnessing their awe can make people realize that their humdrum backyard is maybe not that humdrum after all. Captive orcas in aquaria and marine parks are another reason why public attitudes shifted from fear to fascination to concern over animal welfare, as has been so carefully documented by James M. Colby in Orca. Despite opposition, the capture and trade of orcas continues and one harrowing chapter delves into the infamous Russian “whale jail” that was exposed by journalist Mashaz Netrebenko in 2018.

As mentioned earlier, this is not a scholarly book, so orca biology takes a bit of a backseat. Nevertheless, you will learn about, for instance, the different orca populations and their dietary specializations, and how they do not mix genetically, causing a headache for conservation biologists. This behaviour is a prominent example of culture in cetaceans as it is learned and passed on from generation to generation. Strager also discusses the recent spate of attacks by orcas on pleasure craft in the Mediterranean. A marine mammal researcher from Madeira admits that she does not know if this is retaliation or just rambunctious play, but its rapid spread in the region sure points to orcas learning new behaviours from each other. Conservation concerns are the main recurrent biological theme in this book. Reflecting on the situation in the Pacific Northwest and the tremendous efforts expended on returning one orphaned orca, Springer, back to its pod, Strager writes how: “saving one orphan whale is a trivial task compared to changing the conditions that threaten these whales” (p. 214). Overfishing, chemical and noise pollution, shipping, aquaculture, hydroelectric dams—the long list of environmental insults is a poignant reminder that, in the words of Michael J. Moore, we are all whalers, even if only indirectly.

Orcas in the Lemaire Channel, Antarctica, surrounded by icebergs.
Orcas in the Lemaire Channel by Pedro Szekely, via flickr.

The other aspect that takes a backseat is Strager’s personal story. This book covers some four decades of her life, from a young student in the 1980s to a seasoned researcher now. And yet, important life events are mentioned rather than elaborated upon. They help provide a sense of place and circumstance, but never play a central or even supporting role in her stories. The fact that she would have a child with the man who helped her onto that first research vessel all those years ago is one of those offhand, blink-and-you-miss-it comments. Nor does she mention that she is now working as a Director of Exhibitions, turning the local Whale Center in Andenes, Norway, where she worked for years into a world-class museum, The Whale, to open in 2025.

The Killer Whale Journals takes in an impressively broad range of people past and present. There are various other fascinating stories I have not even touched upon here. Strager remains mild-mannered and non-judgemental throughout as she carefully charts the nuances, inconsistencies, and complexities of people’s attitudes. If you have any interest in cetaceans or marine biology more generally, this absorbing book comes recommended.

The NHBS Guide to UK Jellyfish and Hydrozoa Identification

Jellyfish, or jellies (as some scientists would like them to be called), are mainly free-swimming members of the subphylum Medusozoa. The jellyfish form is actually the medusa phase of certain gelatinous Medusozoans, many of whom also have several other phases, including a sedentary polyp phase. Jellyfish are found across the world and fossil evidence shows that they have been in existence for at least 500 million years. The largest is thought to be the Lion’s Mane Jellyfish, whose tentacles have been recorded up to 36.6m long. The smallest is thought to be the Irukani Jellyfish, which measures one cubic centimetre (1cm3). 

Hydrozoa are small, predatory animals that can live solitarily or in colonies. Mostly, they are permanently attached to the substrate, but some are pelagic (free-swimming). The individual animals of colonial hydrozoa are called zooids and they can play different roles within the colony, such as digestion (gastrozooid), reproduction (gonophores) and tentacle-bearing zooids (dactylozooids).

Both jellyfish and hydrozoans are part of the phylum Cnidaria. Most species within this phylum have stinging cells called nematocysts, located mainly on the tentacles. True jellyfish, however, also have them around the mouth and in the stomach. Also called cnidocytes, these explosive cells deliver a structure containing toxins, which can act as a weapon against predators or to immobilise or kill prey.

Cnidarians are thought to be amongst the most important planktonic and benthic predators in the sea as, when abundant, they are major consumers of plankton, including fish larvae and crustaceans. They also prey on small fish and other jellyfish species. Most are planktonic creatures, unable to swim against the current ,and are therefore carried by the currents throughout the oceans. Because of this, they cannot actively hunt prey, so many species have developed incredibly long tentacles to increase their chances of catching food.

This blog covers the identifying features of a number of species of Jellyfish and hydrozoa you are likely to find in UK waters, as well as the seasons they are present.  

Jellyfish 

Moon Jellyfish (Aurelia aurita) 
Aurelia aurita / Moon Jellyfish swimming along a bed of seaweed.
Aurelia aurita / Moon Jellyfish by Katya, via flickr.

Season: All year 

What to look for: This species is translucent, with a white tinge to its bell. Its most recognisable feature is the four horseshoe shapes or circles visible through the top of its body. These are reproductive organs called gonads, and can range from white to purple in colour. Moon Jellyfish have thin, short tentacles hanging from the edges of the bell, as well as four feeding appendages called oral arms which surround the mouth beneath the bell.  

Compass Jellyfish (Chrysaora hysoscella) 
Compass Jellyfish (Chrysaora hysoscella) swimming on the surface by the edge of the harbour in County Cork, Ireland.
Compass Jellyfish (Chrysaora hysoscella) by Dale Simonson, via flickr.

Season: May to October 

What to look for: Yellowish-white jellyfish with a brown fringe around the bell. Its name comes from the brown markings on the top of the bell, where v shapes radiate out from a central point, resembling a compass. Their oral arms are fringed, and they have long, thin tentacles around the edge of the bell.  

Lion’s Mane Jellyfish (Cyanea capillata) 
Lion's Mane Jellyfish Cyanea capillata washed up on the sand.
Lion’s Mane Jellyfish Cyanea capillata by gailhampshire, via flickr.

 

The lion's mane jellyfish (Cyanea capillata) swimming in the sea by Derek Keats.
The lion’s mane jellyfish (Cyanea capillata) by Derek Keats, via flickr.

 

 

 

 

 

Season: May to October 

What to look for: Translucent brown jellyfish, although it can also be reddish. The bell of this species has eight lobes, rather than being simply circular. This species has a thick ‘mane’ consisting of hundreds of hair-like tentacles attached to the bell’s subumbrella. They also have a number of frilly oral arms extending from around the mouth, which are shorter than the tentacles. 

Did you know? The Lion’s Mane Jellyfish is one of the longest animals in the world; its tentacles can grow to over 30m long! 

Barrel Jellyfish (Rhizostoma pulmo) 
Barrel Jellyfish swimming left to right with a scuba diver below it.
Barrel Jellyfish by heartypanther, via flickr.

Season: May to October 

What to look for: The Barrel Jellyfish is a large translucent jellyfish, with a huge mushroom-shaped bell. They lack tentacles on the edges of their bell, but they do have a violet fringe containing sensory organs with eight frilly tentacles below this. 

Blue Jellyfish (Cyanea lamarckii) 
Bluefire jellyfish in Brofjorden at Sandvik.
Bluefire jellyfish (Cyanea lamarckii) by Ann-Sophie Qvarnström, via flickr.

Season: May to October 

What to look for: Also called the Bluefire Jellyfish, this species can vary in colouration depending on maturity, so may have a blue, purple or yellow tone. Yellow toned individuals may be confused with Lion’s Mane Jellyfish, however Blue Jellyfish can be distinguished by their smaller size and fewer tentacles. They can grow up to 30cm in length, although most individuals usually measure between 1020cm. They can have a dark blue, circular, sun-like pattern on the top of their bell, as well as long marginal tentacles and several, frilly oral arms.  

Mauve Stinger (Pelagia noctiluca) 
Mauve Stinger Pelagia noctiluca swimming in clear blue waters.
Mauve Stinger Pelagia noctiluca by Don Loarie, via flickr.

Season: July to October, but dependent on weather and ocean currents 

What to look for: This species has a dome-shaped bell that is covered in wart-like stinging cells and eight marginal tentacles emanating from the edges of the bell. They also have four long oral arms that also have wart-like nematocysts down one side; while the other side is crenulated, giving the arms a slightly frilly appearance. The colour of this species varies from mauve, pink and purple to light brown or yellow.  

Hydrazoa 

Portuguese Man o’ War (Physalia physalis) 
PortugueseMan o' War washed up on a sandy beach.
Portuguese Man o’ War by 4Neus, via flickr.
Portuguese man o' war swimming on the surface.
Portuguese man o’ war by Joi Ito, via flickr.

Season: September to December 

What to look for: The Portuguese Man o’ War is not one animal, but a colony organism made up of four polyp types. The uppermost polyp is the gas-filled structure called the pneumatophore, which sits on the surface of the water and is the most visible. It is mostly transparent, with a blue, pink or purple tinge. The top edge of this structure resembles a sail. Two other polyps cooperate to allow the colony to hunt and feed: the polyp containing gastrozooids and the tentacles (dactylozooids). These tentacles can be a variety of colours, such as blue, purple or clear, and hang down below the surface. The final polyp type is the gonodendron, the compound reproductive structure that can be found hanging just below the pneumatophore. These can also vary in colour, and are often deep blue, pink or purple.   

By-the-wind-sailor (Velalla velalla) 
By-the-Wind Sailor by Philip McErlean washed up on a sandy beach in Ireland.
By-the-Wind Sailor by Philip McErlean, via flickr.

Season: September to March 

What to look for: This species is also a colonial hydroid made up of multiple polyps, and contains gonozooids and dactylozooids. It has an oval disc that is deep blue in colour and acts as a float, with short tentacles hanging down from it. A semi-circular fan is set atop the float like a sail which aids its movement through the water via wind power.

The NHBS Guide to Thistles

Distinctively prickly with pink or purple flowers, thistles belong to the largest family of flowering plant in the UK (with the exception of the grasses) – Asteraceae. These common plants are found throughout Britain and Ireland, providing key services for invertebrates who seek safety in the sharp spines. The leaves and nectar of thistles are also excellent sources of food for other groups, including pollinators and Painted Lady caterpillars, and several bird species are known to eat the seeds.

Here we take a look at a selection of thistles found throughout the UK, highlighting their distribution and ways in which they may be identified.  


 Creeping Thistle (Cirsium arvense)  

Creeping Thistle by hedera.baltica via Flickr

ID Notes: This perennial flower is named for its far-reaching, creeping roots. The leaves are smooth and grey-green in colour, with wavy, spined edges. The stems are smooth, neither spined nor winged. The flowerheads produce small, pale pink flowers (1.5–2.5cm) in small clusters with pear-shaped bases covered with phyllaries pressed against the flowerhead, curving outwards.  

Distribution: Widespread and common throughout Britain and Ireland. Creeping Thistles can be found from June to October on rough grassland, roadside verges and field edges – a preference for disturbed and cultivated ground is observed in this species.  

 

Spear Thistle (Cirsium vulgare) 

Spear Thistle by Andreas Rockstein via Flickr

ID Notes: This thistle is particularly attractive to pollinators, who are often seen feasting on the deep pink flowers. The large flowerheads (up to three may be present per stem) sit on a bulbous, spiked base with long, spreading phyllaries. The leaves of a Spear Thistle have long, lanceolate segments tipped with spines, and the upper surface is bristly. The stem is covered with light hair and sporadic spiny wings.  

Distribution: Widespread and common throughout Britain and Ireland. It can be found from July to October on disturbed ground such as roadside verges, field edges and pastures.  

 

Welted Thistle (Carduus crispus) 

Welted Thistle by Joost J. Bakker IJmuiden via Flickr

ID Notes: This plant has small, red-purple flowerheads that are clustered together. The base of the flower head has spiny, protruding bracts and the phyllaries project outwards. The branched stems have several rows of spiny wings, and the leaves have broader lobes than is typical for other thistles, with spiny margins. 

Distribution: Widespread throughout Britain, except Ireland. This species shows a preference for nutrient-enriched substrates, including brownfields, field margins, meadows and beside streams.  

 

Marsh Thistle (Cirsium palustre) 

Marsh Thistle by Gertjan van Noord via Flickr

ID Notes: Growing up to 2m in height, this large thistle is easily identified by its purple tinge. The flowerheads are small and are found in large clusters, with small reddish-purple or white flowers and the phyllaries are pressed against the flower head, with tips facing downwards. Leaves are more slender and shorter, with hair visible on the upper surface, they are often tinged purple on the margins and have many spines.  

Distribution: Widespread throughout Britain and Ireland, and can be found in marshes, damp grassland and meadows. 

 

Meadow Thistle (Cirsium dissectum) 

Meadow Thistle by Thibault Lefort via Flickr

ID Notes: Each Meadow Thistle has one flower head on a cottony stem, growing up to 80cm tall the solitary flower has purple-tipped, long bracts and the base covered with light, white hair. The stems are not winged, and basal leaves are toothed in a rosette formation. The remaining leaves are finely toothed, without spines, and have light hair on top, with a white, cottony appearance underneath.

Distribution: Most common in the south of the UK, with strongholds in the south-west and south Wales. Meadow Thistles are scarce towards the north. They can be found in bogs, fens, grassland and meadows.  

 

Musk Thistle (Carduus nutans) 

Musk Thistle by Sam Thomas via Flickr

ID Notes: Growing up to 2m in height, the Musk Thistle is recognised for its greyish-green colour. The flowerheads are large (3–5cm across), often nodding to one side after maturity, and have long, spiny phyllaries and two-lipped petals. The leaves are short and twisted, with spines present on the toothy lobes and are often woolly underneath.  

Distribution: Widespread throughout Britain, but absent from Scotland and Ireland. Most commonly found on calcareous soil from May to September.  

 

Woolly Thistle (Cirsium eriophorum) 

Woolly Thistle by Olive Titus via Flickr

ID Notes: The Woolly Thistle gets its name from its wool-like covering. The leaves are ladder-like and narrow, tipped with spines and are white underneath. The stems are wingless and are covered in cobweb-like hairs, producing a single large flowerhead. The phyllaries on the flower base are downward curved, spread throughout the cobwebbing.  

Distribution: Widespread throughout Britain, with strongholds in the Yorkshire Wolds and the Isle of Wight. The ‘queen of thistles’ often prefers chalky soils.