Aquatic ecology – Page 2 – Hoopoe

Author Interview with Mark Carwardine: Field Guide to Whales, Dolphins and Porpoises

Practical and portable, this is the ultimate field guide to the world’s cetaceans. This is the most comprehensive, authoritative and up-to-date guide to whales, dolphins and porpoises. Containing more than 500 accurate illustrations – complete with detailed annotations pointing out the most significant field marks – this new field guide covers all 93 species and every subspecies in the world.

The informative text, produced in collaboration with many of the world’s most respected whale biologists, is accompanied by distribution maps, size demonstrations, dive sequences and additional information such as comparisons of silhouettes and illustrations of barnacles, lice and callosities.

Cetacean expert Mark Carwardine kindly took the time to discuss this new field guide with us, discussing how the outlook for cetaceans has changed since he first began to study them, why he chose to use illustrations over photographs and what he is working on now.

What inspired you to write this new field guide and how does it differ from your previous handbook?

The Handbook of Whales, Dolphins and Porpoises was the culmination of a life’s work, really, and took six years to research and write. It was designed as a comprehensive reference book to be used at home or in the office – and, consequently, weighs almost as much as a small porpoise. The pocket-sized Field Guide to Whales, Dolphins and Porpoises is an abbreviated (and fully updated) version, focusing more on identification, and it has been designed specifically to take into the field. Since our knowledge of cetaceans has improved so much, with new behaviour and many new species described in recent years, previous field guides (my own included) are drastically out of date. I think a new guide was desperately needed.

Dusky dolphin by wanderstruck via Flickr

Your book includes a number of threatened species, including the functionally extinct Yangtze river dolphin and the vaquita, many of which we may lose entirely over the next decade. How has the outlook for whales, dolphins and porpoises changed since you first started to study cetaceans?

There’s no doubt that for many cetacean species, if not most, the outlook is worse than it was when I started working in this field. Some – the humpback whale is a good example – are doing surprisingly well, against all odds. But many others are not. The vaquita, we believe, is down to the last 10 individuals and is almost certainly the next (after the Yangtze river dolphin) doomed to extinction. Sadly, though, it’s not alone. The North Atlantic right whale comes to mind – there are fewer than 350 survivors and, with numbers continuing to decline, we fear for its future. Countless others are on the verge of extinction or have all but disappeared from many of their former haunts. Sometimes, I am surprised that any survive at all, given the shocking number of threats they face, such as commercial whaling and other forms of hunting, myriad conflicts with fisheries, pollution, habitat degradation and disturbance, underwater noise, entanglement in or ingestion of marine debris, ship strikes and climate change.

This field guide is full of beautiful and detailed illustrations. Why did you choose to include these rather than photographs?

I prefer the use of illustrations in field guides, because I think they demonstrate the key identification features more effectively. Also, there is a huge amount of variation within each species of cetacean – geographical variations, races and sub-species etc – and good photographs do not exist of many of the most critical ones!

Relatively little is known about the population estimates or trends of many of the species listed in this book. Why do you think this is the case, and is there ongoing research taking place to fill these knowledge gaps?

It’s true to say that our knowledge of cetaceans has grown from virtually nothing to just a little bit – despite decades of wild whale research. They are incredibly difficult animals to study, because they spend most of their lives underwater, often live far out to sea and regularly travel vast distances. They are even more difficult to count. I take people to see the friendly grey whales in San Ignacio Lagoon, Mexico, every year and we have fun trying to estimate the number of whales within the relatively small lagoon. Everyone comes up with wildly different numbers. Just imagine trying to estimate the number of minke whales, for example, in the North Atlantic. In some cases, a species is so rare that we know every individual and have an accurate population size. But in many cases it’s an informed guesstimate. The key thing is to be able to compare these guesstimates from time to time and place to place to get relative population trends. And, with some exceptions, I do think we have a pretty good idea about which species are declining and which are doing relatively well.

Minke whale with a satellite tag, image by Oregon State University via Flickr

Is there anything that you are currently working on or do you have any plans for future projects that you would like to tell us about?

Well, I’ll never stop spending as much time with whales, dolphins and porpoises as possible! And I’ll be keeping the field guide up-to-date, of course, for future editions. But I’ve also been working on a book closer to home, called RSPB How to Photograph Garden Birds, which will be out early next year (to tie in with the RSPB’s Big Garden Birdwatch). It started as an excuse during lockdown to photograph my own garden birds but, as I developed and discovered more tricks and techniques, it gradually turned into a book. One thing I’ve learned is that you don’t have to travel to far-flung corners of the world to take great pictures of wildlife. Indeed, some of the most memorable and eye-catching images I’ve ever seen – especially while judging umpteen wildlife photography competitions over the years – have been of common and familiar species taken close to home. Yet these more ‘ordinary’ subjects tend to be ignored by many photographers. They are considered too obvious or insufficiently compelling (although I’ve never understood why because, by any standard, many of our garden birds are strikingly beautiful). While there are countless awe-inspiring images of polar bears and humpback whales, when was the last time you saw a truly inspirational image of a house sparrow or a robin, for example? Exactly. Hopefully, that’s where this book will help and inspire.

Field Guide to Whales, Dolphins and Porpoises
By: Mark Carwardine
Paperback | May 2022 | £12.99 ~~£16.99~~

All prices correct at the time of this article’s publication.

MARINElife: Q&A with Rick Morris and Tom Brereton

MARINElife is a science charity that conducts research on the health of our oceans by gathering information on key marine species. With the help of experienced volunteers, they carry out dolphin, whale and seabird surveys in UK and bordering waters and provide relevant, robust and up-to-date information to those working for the sustainable future of our oceans. MARINElife also runs an extensive programme of educational and outreach events, from species identification to full surveyor courses.

Research Director Tom Brereton and Trustee, Trainer and Wildlife Officer Rick Morris have kindly taken the time to answer a few questions for us.

Could you tell us about the work MARINElife does and how your charity began?

MARINElife is a charity (established in 2005) that is dedicated to the conservation of marine wildlife through research and educational activities. MARINElife grew out of the Biscay Dolphin Research Programme (BDRP), which was a survey and educational programme originally based on a P&O ferry from Portsmouth to Bilbao (1995-2010).

Today, MARINElife carries out scientifically robust surveys of dolphins, whales, and seabirds, made by experienced volunteers, on a variety of vessels at sea in UK and bordering waters, from angling boats through to large commercial ferries. The work is done in partnership with a wide range of sponsoring bodies from ecotourism through to research institutes and shipping companies.

MARINElife Surveyors by Rick Morris Photography

You survey many key marine species to monitor the health of our oceans. Could you explain a bit more about the role dolphins, whales and seabirds play in the marine ecosystem and the key threats they are facing?

Dolphins perform crucial roles in their native ecosystems wherever they’re found and function as high-level predators feeding primarily on fish and squid. In any ecosystem, carnivores near or at the top of the food chain establish fundamental order all the way down to the bottom, and their removal can have wide-ranging and highly complex repercussions.

Whales play a vital role in the marine ecosystem as they help provide at least half of the oxygen you breathe by providing nutrients to phytoplankton.

Seabirds can be a good and visible indicator of the wider health of the marine environment as they feed on many of the same species as cetaceans and are often found in association with cetaceans during feeding.

The key threats to whales, dolphins and seabirds are: whaling, climate change, overfishing, by-catch, entanglement in ghost fishing gear, noise pollution and ship strikes.

The marine realm is an important resource for many communities but is also intensely exploited. Do you believe a balance can be found between its continued use and the improvement and maintenance of ocean health?

We believe that through scientific evidence and good educational programs, cooperation with local fishing communities and everyone who depends upon the marine environment can be established to safeguard the future of our seas.

Presently, you are focusing on your small boat surveys in Lyme Bay monitoring dolphin populations. Have you noted any changes since the start of the pandemic?

Generally, there seems to be less commercial fishing activity during the day than there was a few years ago, perhaps a sign that the area has been “fished out” to some degree. There has been a notable increase in Balearic Shearwaters throughout the summer months in both years, with the Bay becoming more and more important for this species. 2020 was characterised by large numbers of Bluefin Tuna, whilst 2021 was a late season with hardly any Mackerel until September.

Bottlenose Dolphin by Rick Morris Photography

Using data collected by MARINElife, a major study published this year highlighted the importance of south-west UK waters to the Critically Endangered Balearic Shearwater. What conservation measures would you like to see put in place to help this species?

The main global threats to the species have been identified as drowning in fishing nets and predation by introduced species on their breeding grounds. For the bycatch issue, appropriate mitigation measures are urgently needed, whilst predator control and eradication measures need to be stepped up at breeding sites. Research is required on other threats including light pollution, marine plastics and climate change. More locally, shoaling pelagic fish such as Anchovy, which are key prey items, need to be protected from overfishing and disturbance of moulting flocks need to be monitored and regulated if required. Work needs to continue to identify and designate Special Protection Areas for the species, where these will make a real difference to the conservation of the species.

Balearic Shearwater by Tom Brereton/MARINElife

For those interested in your work and would like to get involved with MARINElife, how would you best recommend they do this?

The best route to get involved would be to email info@marine-life.org.uk and state what skills you have that would be suited to our work!

Reference

Phillips, J. A., et al. 2021. Consistent concentrations of critically endangered Balearic shearwaters in UK waters revealed by at-sea surveys. Ecology and Evolution, 11(4): 1544-1557.

You can find out more about MARINElife from their website and by following them on Facebook and Twitter.

The NHBS Guide to Snorkelling

Snorkelling is a great summer pastime and a brilliant way to experience many amazing species that inhabit our oceans. The inshore coastal environment is incredibly diverse and full of life, so there’s a chance you might see something different every time you snorkel! Depending on when and where you swim, you may even be able to see some creatures you recognise from rock pooling and learn how they behave when the tide is in.

Planning a trip

When planning a snorkelling trip, there are several important factors to consider. Firstly, it is important to familiarise yourself with the area you plan to snorkel in. To ensure your safety, make sure that there is constant, safe access to and from the sea, and that the water is clean enough to swim in. An understanding of potentially harmful species you might come across is also important. For instance, blue-green algae (which is actually a type of bacteria) can lead to illnesses in humans, and others, such as the Portuguese man-of-war (Physalia physalis), have very painful stings that could ruin your trip.

A big factor to take into account is the weather. Rain, wind and cold weather can all impact the quality of your snorkelling trip. From reducing visibility to causing dangerous conditions, the weather should always be taken seriously. Plan to snorkel on a warm, clear, calm day and make sure to continuously monitor the weather during your swim. Be careful not to swim at midday on a hot day either, if you are particularly sensitive to the sun.

Checking the water temperature is important, as it allows you to plan what you’ll need to wear and how long you should be in the water. You should aim to limit your exposure to colder water as it can lead to cold water shock and hypothermia.

Finally, the tide. It is best to swim as close to high tide or low tide as you can. Swimming in a changing tide can be tiring and can reduce the clarity of the water. High tide often offers the clearest water and allows snorkelling access to areas previously too shallow to swim in. It can also be safer in some areas: the increased volume of water could allow for greater space between you and any sharp rocks or reefs on the sea bed. This does mean that it may be too deep in other areas to clearly see the seafloor, so you might have to repeatedly dive down. Also, after high tide, the tide will begin to go out. This can be dangerous for swimmers, especially for those in areas with strong tidal currents, as you can be dragged further out to sea.

At low tide, you can snorkel further offshore, meaning you may see more species. However, certain areas closer to shore may be too shallow for safe snorkelling. The current will be in-bound after low tide, so you won’t be pulled out to sea, but you may be pushed into dangerous inshore areas. It is best to research the currents and coastal geography of the area before beginning your trip!

Check out our collection of tide times guides, as well as a few of our snorkelling guides.

Equipment and method

There are several key pieces of equipment needed for snorkelling and a few extras that can be useful. A snorkel and mask are obvious, but a pair of fins can help you swim for longer without tiring. They can also be helpful in stronger or unexpected currents. A wetsuit or rash vest is advisable for colder water temperatures, as are wetsuit shoes, gloves, and hats to help to keep you warm and protected in the water. A life jacket is a vital piece of gear to keep you afloat if you find yourself in danger or too tired to keep swimming.

Other equipment that you may want to bring are an underwater camera or a waterproof case for a phone. Dive slates or waterproof notebooks will help you keep track of everything you have seen.

To minimise disturbance while snorkelling, keep your distance from any animal you see and make sure not to step on or touch anything on the sea bed, as this habitat can be fragile. When diving down, be careful how you swim and return to the surface; kicking too hard can disturb any sediment below, reducing water clarity. This isn’t great for you as it can limit what you’ll be able to see, but it can also impact marine life, particularly corals and seaweed, as it reduces the amount of light that reaches them.

What could you see?

Spider Crab (Maja squinado)

Velvet Swimming Crab (Necora puber)

Common Lobster (Homarus gammarus)

Candy Striped Flatworm (Prostheceraeus vittatus)

Spiny Starfish (Marthasterias glacialis)

Lesser-Spotted Catshark (Scyliorhinus canicula)

Plaice (Pleuronectes platessa)

Greater Pipefish (Syngnathus acus)

European Cuttlefish (Sepia officinalis)

Moon Jellyfish (Aurelia aurita)

Common Eelgrass (Zostera marina)

Oarweed (Laminaria digitata)

The NHBS Guide to Beachcombing

Beachcombing involves searching along the shoreline for interesting, valuable or usable objects. It’s not a new activity; the first use of this word in print was in 1840! Originally the intention of beachcombing was to find and sell objects of value washed up on the coast. Now, it is more of a recreational activity and there is a long list of natural and manmade curiosities that can be found.

Beachcombing is a simple activity that you can do anytime you are at the beach. The best approach is to find the tideline, usually indicated by a ‘line’ of washed-up material such as seaweed. It is best to check the tide times and visit at low tide. Many people also recommend visiting after a storm, as the stronger waves may have washed up more items.

There are several equipment options that may be useful to take with you, including a hand lens, specimen pots, and a camera. You should also bring a bag for any items or litter you collect, as well as gloves and hand sanitiser, plus wear weather-appropriate clothing and sensible shoes. A guidebook to help identify the items you may find would be helpful.

What could you find?

Natural

Mermaid’s purse

Lesser-spotted catshark egg case by Martyn Fletcher via Flickr

These are the egg cases of sharks, skates, and rays (class Chondrichthyes). They can often be found along the tideline tangled in the seaweed. They come in many different shapes, sizes and colours, depending on the species. Not all Chondrichthyans lay these egg cases, as some give birth to live young. Those that do lay eggs often do so on the seafloor to hide them from predators and to keep them from floating away until they’ve hatched. The exact species can be hard to identify, but there is an online guide that may be useful.

Marine worm tubes

Keel worm tubes by Kevin Walsh via Flickr

Several species of marine worms form calcareous tube structures on rocks, pebbles and shells. These tubes are white, irregularly curved and are a triangular shape when first made. Over time, they can become eroded to two thin white lines. They’re common across our coasts, but rarer finds are objects covered in hundreds of these tubes.

By-the-wind Sailor (Velella velella)

By-the-wind sailor by Philip McErlean via Flickr

This species may look like a jellyfish but it’s actually a hydrozoa. It is known by many names, such as sea raft, purple sail, or little sail. This species is often mistaken for the Portuguese man o’war, but its sting is much less painful to humans. Often spotted around the UK coastline, particularly after a storm, the by-the-wind sailor can be an interesting sight while beachcombing.

Common Whelk eggs (Buccinum undatum)

Common whelk eggs by Les Chatfield via Flickr

The common whelk is a large marine gastropod found along the shore of the UK. The empty egg cases, formed in a ball, can often be found washed up on beaches during the summer. They have several colloquial names, including sea wash balls, egg clouds and fisherman’s soap.

Fossils

Fossil on beach by Matthew Anderson via Flickr

Fossils are physical records of history and one of the main attractions for many beachcombers. Very simply, fossils are formed when organisms are buried in sediment, and as this sediment becomes compacted by heat or pressure, it turns to rock, leaving behind the exact shape or an impression of an organism.

Shark tooth fossil by Virginia State Park via Flickr

There are several beaches, such as Charmouth in Dorset, where fossils are more likely to be seen, but they can be found on any shoreline. There are several guides on how to safely and sustainably search for fossils. The main guidance is to never hammer at cliffs (as they can be unstable), be careful around fragile habitats, and limit the amount of damage you do when extracting fossils. It is better to leave a fossil uncollected than to destroy the area it is held in.

Seashells

Seashells are the hard, protective outer layer of marine invertebrate species. Empty shells often wash up on beaches and shells from molluscs, barnacles, sea urchins, and crabs can all be found on the shoreline. As they are primarily made from calcium carbonate, seashells can be used in the production of lime. They’re also used in art, as poultry feed, musical instruments, and play a part in religion and spirituality. Throughout history, they’ve been used as decorative items, tools and currency.

Cuttlebone

Cuttlefish bone by Anna Gardiner via Flickr

Also known as a cuttlefish bone, the cuttlebone is a hard and brittle structure that forms an internal shell in all cuttlefish (order Sepiida). They can be found along the coast and have several historical uses. They were ground up to make polishing powder, which was used by goldsmiths and added to toothpaste. Cuttlefish bones were also used as an antacid. Today, they are more commonly used as a dietary supplement for pets such as birds, reptiles and shrimp, as they are rich in calcium.

Manmade

Sadly, you may also find a huge variety of manmade items on the beach. While beautifully painted tiles, sparkling sea glass and ancient treasures may be a highlight of your beachcombing trip, you are far more likely to see washed up fishing gear and plastic.

Fishing gear

Dumped fishing gear, both intentionally and accidentally, is thought to be the biggest contributor to marine litter. One study found that 70% of macroplastics on the surface of the ocean was related to fishing. Another study found that 86% of the macroplastic in the great Pacific garbage patch was fishing nets. These often also wash up on our beaches, tangled together with many different manmade and natural items, and even wildlife.

Other plastics

Beaches can be covered in plastic, particularly after a storm. This is especially true if there is no action plan in place for keeping the beach clean. There are many volunteer groups you can join, or you can organise one yourself, that complete beach cleans. While beachcombing, bringing a bucket or bag with you to collect any plastic or litter is a great way to help your local environment and community.

BES Summer School Guest Blog: Part Two

This post continues the series of guest blogs written by students from the BES Undergraduate Summer School 2020. In this, the second installment, Kira Prouse discusses the gases responsible for the smell of the sea and their role in marine ecosystems.

Kira Prouse

How plankton are responsible for the smell of the sea

The smell of the seaside is distinctive and elicits nostalgic memories for many people. It may be a surprise when you learn this charismatic smell is actually made up of a cocktail of gasses from phytoplankton and bacteria in the ocean’s surface waters! The smelliest of these gasses is Dimethyl Sulphide.

Dimethyl Sulphide, shortened to DMS, starts as DMSP or Dimethylsulfoniopropionate (a bit of a tongue twister!) and is broken down into DMS when the cell containing it dies, and the chemical is released into the water column. DMSP is thought to help with:

• Allowing cellular reactions to continue in polar regions with freezing conditions.
• It acts as a natural sunscreen, protecting against harmful chemicals produced by high light or ultraviolet radiation.
• It allows for survival in saline oceans by regulating DMSP concentrations to match the salinity of the surrounding environment.
• Herbivore deterrent – DMSP and DMS may be produced by algae to make them herbivore deterrents and reducing grazing damage.

Many animals, including birds, turtles and marine mammals, use the smell of DMS in order to find areas rich in food. In an otherwise vast and featureless ocean, the scent of DMS could hint at bathymetric features like upwelling zones and seamounts (areas known for their high productivity). As DMS is released when the cell dies, this could happen when the algae or phytoplankton are grazed by zooplankton, which would appeal to animals such as albatrosses who have a very good sense of smell. Unfortunately, as plastics are continually polluting the oceans, DMS particles cling to the surface of the plastic and make it smell appealing to any animal attracted to the scent of DMS. This means more plastic is being injested by birds because it smells like a tasty meal.

Not only does DMS have an ecological benefit, it also has an impact on how the climate is regulated. DMS stimulates the formation of cloud seeding particles and thus the formation of clouds. DMS leaves the surface of the water where, in the atmosphere, it oxidises into a number of compounds including sulphur dioxide (a cloud condensation nuclei). These particles mix with the evaporated water from the ocean and form clouds. This is important because clouds play a role in the amount of solar radiation reaching the Earth’s surface. Some clouds reflect the solar radiation and prevent the rays reaching the surface, having a cooling effect. Other clouds trap heat from the Earth’s surface, having a warming effect.

The more we understand about DMS the better we will understand how climate is regulated and how it will be affected by climate change. There are still unanswered questions about why some algae produce more DMSP than others and whether this affects concentrations seasonally. This also means that concentrations could vary geographically too. To help find out, NERC are collaborating with The University of East Anglia to investigate DMSP in the English Channel over the span of a year.

This blog post was inspired by the Plymouth Marine Laboratories coffee break science series.

The NHBS Guide to UK Seaweed Identification

Seaweeds, or marine macroalgae, are plant-like organisms that live in coastal areas, usually attached to rocks or other substrates. They are divided into three taxonomic groups: brown, red and green. Broadly speaking, species fall into the group that most closely matches their colour. However, the groups also differ in more complex structural and biochemical features, such as their photosynthetic pigments and cell structure. While green and red seaweeds are classified in the Kingdom Plantae, which also includes all of the world’s land plants, brown seaweeds belong to the Kingdom Chromista and are more related to algae, diatoms and protozoans.

British and Irish seas are home to more than 600 species of seaweed; this is more than 6% of the known species globally. They are incredibly important ecologically and provide both food and shelter for numerous other creatures. In fact, one of the great pleasures of studying seaweeds is the many other species that you find along the way.

If you find yourself enjoying your seaweed studies, why not contribute to the Natural History Museum’s Big Seaweed Search. It only takes around an hour and will provide valuable data that can be used to research the effects of environmental change on our seashore communities.

When and where to find seaweed

Seaweed is present all year round. At low tide, more of the shore will be exposed which means that you are likely to find a greater range of species. This is also the only time that you are likely to spot a glimpse of those seaweeds that thrive in the lower intertidal zone. Sheltered shores tend to provide a better location for many species, as most cannot survive the battering of the waves in more exposed locations. However, there are a few species that are specially adapted to live on exposed shores so it’s always worth a look there. Similarly, as most species require a firm substrate to anchor to, rocky shores will be home to more seaweeds than sandy or muddy ones.

Ten common species to look for

Brown seaweeds:

**Bladder wrack (Fucus vesiculosus)**

Bladderwrack from the Dr. Mary Gillham Archive Project via Flickr.

ID notes: An olive-brown seaweed that has branching fronds with smooth edges. Paired air-filled bladders run along the length of the fronds on either side of the central rib. 15-100cm in length. The number of bladders present is related to the exposure of the shore; in very exposed places this species may grow without any bladders and will also be much reduced in length.

Distribution: Found on rocky shores between the high and low water line.

**Knotted wrack (Ascophylum nodosum)**

Knotted wrack from the Dr Mary Gillham Archive Project via Flickr.

Also known as: Egg wrack

ID notes: This yellow-brown seaweed has long fronds reaching up to two metres in length. Single large air bladders appear at regular intervals along its length.

Distribution: Found on the mid-shore on sheltered rocky coasts. Knotted wrack is very long-lived (up to 15 years) in comparison to other algae; this allows it to become dominant on many sheltered coastlines. When the tide goes out it often forms huge piles.

**Spiral wrack (Fucus spiralis)**

Spiral wrack from the Dr Mary Gillham Archive Project via Flickr

Also known as: Twisted wrack

ID notes: Spiral wrack is generally a pale olive-brown and grows up to 40cm. As the name would suggest, fronds are generally (although not always) twisted and have smooth edges and a distinct central rib. When mature, fronds have yellowish, paired swollen tips; these are the reproductive structures.

Distribution: Found high on the rocky shore, just below the high-water mark.

**Serrated wrack (Fucus serratus)**

Also known as: Toothed wrack or saw wrack

ID notes: This brown seaweed forms branched fronds 50 to 80cm in length. Edges are serrated.

Distribution: Found on sheltered and semi-exposed rocky shores just above the low water mark. Fucus serratus is often the dominant algal species found at this point on the shoreline.

**Oarweed (Laminaria digitata)**

ID notes: Oarweed has dark brown-green fronds that are up to two metres in length and split into long finger-like blades. Attaches to the rock with a claw-like holdfast which allows it to survive in rough subtidal conditions.

Distribution: Grows in dense beds in the lower intertidal and shallow subtidal zones (at a depth of up to 20m). Often all that can be seen of this species are the tops of the fronds during low tide.

**Sugar kelp (Saccharina latissimi)**

Also known as: Sea belt

ID notes: Forms long undivided blades that are yellow-brown in colour and have ruffled sides. Grows up to five metres in length.

Distribution: Found on the lower shore and in deep rock pools. Mostly on sheltered shores and can be found up to a depth of 30m.

Green seaweeds:

**Sea lettuce (Ulva lactua)**

ID notes: Sheet-like light green seaweed which grows up to 25cm in length and 30cm in width. Very delicate and almost translucent; almost like floppy lettuce leaves.

Distribution: Found attached to rocks or floating in rock pools.

**Gutweed (Ulva intestinalis)**

Also known as: Grass kelp

ID notes: As the Latin name would suggest, gutweed resembles the intestines of mammals and consists of inflated hollow fronds which have bubbles of air trapped along them. Bright green and grows up to 40cm in length.

Distribution: Occurs in a wide range of intertidal habitats including rockpools and on sand or mud. Can also be found growing on shells or other seaweeds.

Red seaweeds:

**Carrageen (Chondrus crispus)**

Carrageen from the Dr Mary Gillham Archive Project via Flickr

Also known as: Irish moss

ID notes: Dark reddish-purple branching seaweed which appears iridescent when submerged. Turns green with exposure to bright sunlight.

Distribution: Rocky shores and estuaries, on rocks and in pools in the lower intertidal and upper subtidal zones.

**Purple laver (Porphyra umbilicalis)**

Purple laver from the Dr Mary Gillham Archive Project via Flickr

ID notes: Forms fronds of variable shape which are thin and membranous. Olive to purple-brown in colour and up to two metres in length.

Distribution: Found in the mid to upper shore, generally on mussel-covered rocks. Common on exposed coastlines.

The NHBS Guide to Pond Dipping

For many naturalists, some of the most exciting encounters with wildlife as a child were around the edge of a pond, with a net in hand and a sampling tray filled with murky water. It is an excellent activity for children of all ages and is a great way to introduce them to a wide range of plants, insects and amphibians. It offers the opportunity to learn about food chains and food webs as well as discovering some of the amazing insect transformations during their lifecycles. For school groups, a pond dipping trip will satisfy many of the criteria for learning about life processes and living things, and it can also be used to provide inspiration for art, maths or English projects. Younger children will enjoy drawing or painting pictures of the creatures they find, as well as writing stories about their experiences.

Don’t forget that pond dipping isn’t just for children. For adults feeling out of touch with nature, it is an ideal way to reconnect. Ponds, pools and small lakes are also an integral part of our ecosystems and surveying the plant and animal diversity within them is an important way of assessing their health. If you are interested in volunteering as a pond surveyor, take a look at the Freshwater Habitats Trust website for more information.

What you need:

• White tray – Rummage through your recycling bin for an old ice cream tub or place a sheet of white paper in the bottom of a baking tin. Our heavy-duty sampling trays come in three sizes and are sturdy enough to be carried full of water.
• Net – For younger children a small aquarium net is ideal. For adults and older children, a larger pond net will allow you to reach further into the pond.
• Collecting pots – Although it’s perfectly fine to observe your catch directly in the tray, individual pots, particularly those with a magnifying lid, are helpful for looking more closely at individual specimens.
• Field guide – A guide to freshwater animals will help you to identify the species that you find in your pond. You’ll find a few of our favourites at the bottom of this post.

When and where to go:

May to August are the best months for pond dipping as this is when most creatures will be active and breeding. Any body of still water is suitable for studying, but make sure that you have permission to access the area and that the bank of the pond provides safe access to the water. Ponds with a variety of vegetation and open water are likely to support a high diversity of species.

What to do:

Half fill a tray or bucket with water from the pond and set aside. Do the same with your collecting pots and/or magnifying pots (if using).
Use a net to dip into the pond. Sweeping in a figure of eight will ensure that you retain the catch. Areas around the edge of the pond, especially near vegetation, tend to be the most productive. Take care not to scoop up mud from the bottom of the pond, as this will clog up your net and make it difficult to see what you have caught.
Gently turn the net inside out into the tray. Once everything has settled, you should be able to view a fascinating selection of pond-dwelling creatures. A pipette can be used to transfer individual specimens to a magnifying pot for a closer look.
Use a guide such as the Freshwater Name Trail or the FSC What’s in your Pond pack to identify the creatures found. For adults or older children, a more in-depth guide such as Ponds and Small Lakes or the Bloomsbury Concise Pond Wildlife Guide will cover a greater range of species.
When you have finished, make sure to return all water and inhabitants to the pond. Trays, pots and nets should be rinsed and dried thoroughly before storage.

Pond dipping equipment and books:

At NHBS we stock both individual and class-sized pond dipping kits. These contain nets, trays, pots, magnifier and pipettes, as well as the excellent (and waterproof!) Freshwater Name Trail which will help you to identify the key animals found in UK ponds. Or why not choose from our top 10 list of equipment and books for pond dipping:

1. Pond Net
Made at our workshop in Devon, the Pond Net is a high quality, lightweight net with a removable bag for cleaning. The bag is made from woven 1mm mesh which is ideal for pond life. Also available in a telescopic version.

2. FSC Wildlife Pack: Ponds
Find out the names of the insects, plants and birds that you see with this wildlife pack. Features three of the FSC’s popular fold-out charts: Dragonflies and Damselflies, Freshwater Name Trail (classic pond dipping guide) and Commoner Water Plants (from lilypads to water mint). Also includes a card-sized magnifier.

3. Heavy-duty Sampling Trays
These strong white trays are ideal for pond dipping as they are robust and stable enough to be carried when full of water. Available in three sizes.

4. Bug Pots (Set of 10)
This set of ten Bug Pots is perfect for pond dipping, as well as general nature studies. Each pot has a 2.5x magnifying lid and a measurement grid of 5mm squares on the base. They are ideal for storing and observing specimens.

5. Freshwater Life: Britain and Northern Europe

A beautifully illustrated guide to the wide variety of species found in rivers, streams, lakes and ponds in Britain and Europe. Freshwater Life describes and illustrates over 900 species of plant and animal visible with the naked eye. An easy-to-use key guides the user quickly to the correct species without using complex terminology.

6. Economy Telescopic Pond Net
With an aluminium telescopic handle and knotless fine mesh net bag, this pond net will not harm specimens and is guaranteed not to run if holed. Not suitable for heavy-duty use.

7. Ponds and Small Lakes: Microorganisms and Freshwater Ecology

Suitable for adults and older children, this book introduces some of the less familiar and microscopic species found in ponds such as diatoms, desmids and rotifers. Along with excellent photographs, the book provides useful identification keys so that readers can identify, explore and study this microscopic world.

8. Pipettes
Small pipettes are extremely handy for sorting through and picking up tiny creatures found when pond dipping. They can also be used to transfer samples to microscope slides to look at the microscopic specimens found.

9. 125ml Collecting Pots
These sampling containers are made from see-through rigid polystyrene and have secure screw-on lids. They are recommended for liquids and so are ideal for keeping specimens when pond dipping or rock pooling. Available either singly or in packs of 10, 30 or 100.

10. Bloomsbury Concise Pond Wildlife Guide

This concise guide is packed with information on more than 190 species of animal and plant that inhabit ponds, pools and small lakes in northern Europe. Among the fascinating animals featured are freshwater sponges, hydras, water bears, worms, leeches, water snails, dragonflies and damselflies, frogs and toads, bats, fish, birds, water voles and otter.

Creating your own pond:

During the lockdown imposed by Covid-19, the UK and many other countries have seen a rapid growth of interest in nature, especially found in gardens. It is widely considered that the best way to encourage and benefit wildlife in your garden is by adding a pond. There are many books to help in this process, such as Making Wildlife Ponds, The Wildlife Pond Book, or The Pond Book by Pond Conservation.

Author Interview – Heather Buttivant

Sometimes the most extraordinary nature stories and scientific revelations lie in plain sight. So familiar that unique stories of survival are overlooked. Rock Pool is an eye-opening, enchanting journey into the miniature worlds of rock pools with a new author who will change the way you view even the most ordinary creatures – from crabs to barnacles, blennies to anemones – forever.

Educator and award-winning blogger, Heather Buttivant kindly took some time out of her rock pooling schedule to answer our questions about her new book.

Your passion for the marine environment shines throughout Rock Pool, where did your passion stem from?

Like most children growing up by the sea, I liked to pick up seashells, but for me it became an obsession. Back then I couldn’t name everything, but the variety of shapes and textures and the vibrant colours fascinated me. The longer I looked into rock pools, the further I was reeled in. It’s a passion I have no intention of out-growing: no matter how much I know, there is always more to learn.

What was the original inspiration behind your book?

It has always seemed a shame to me that there is so little nature writing available about our incredible intertidal wildlife. When I created a website as part of my MA in professional writing with Falmouth University, I struggled to imagine why anyone would be interested in my ideas for a novel, but the thought of opening up the little-known world of the rock pools filled me with excitement. My Cornish Rock Pools site took off faster than I expected and when the site won the BBC Wildlife Magazine Blog of the Year Award, it came to the attention of the lovely people at September Publishing and this was the perfect opportunity to bring my love for nature writing and for seashore together as a book.

You’ve selected a fascinating range of marine creatures; how did you choose them from such a biodiverse environment?

My identification guides to the seashore contain thousands of species, so narrowing this down to just 24 animals felt like a near-impossible task. Most of the animals I’ve selected can be found all around the UK and Ireland and together they tell an incredible story of survival. I have aimed to convey the experience of animals living in different zones of the shore and in the range of different environments from mud-flats to seagrass beds. Some of the creatures, like barnacles and limpets, are familiar yet have remarkable abilities that are unimaginable to us land-dwellers. Others, like corals, sharks and cephalopods, are animals that most people assume can only be seen by divers but with luck and perseverance they may be seen by rock poolers too.

Rock Pool is full of exciting encounters you have had at the seashore, but which was your most surprising?

I find something new almost every time I visit the shore, but one day, whilst dangling my feet in a pool, with all my attention focused on a tiny sea slug in a petri dish on the rock beside me, I noticed movement in the water. When I glanced down I realised that a substantial lobster was inching towards my toes! I nearly dropped my camera. ‘Bob’, as I now know him, has become quite a legend in our family and his location is a secret that is closely guarded by all those who have met him.

Do you have any tips for a successful rock pooling session?

My top tip is to join a rock pooling event where you can learn and explore with the experts. This is a great way to see amazing animals and to find out how to keep yourself and the wildlife safe on the shore. The key to spotting creatures is to slow right down and take the time to look closely at the small things. Most rock pool animals are masters at hiding in plain sight. A single rock may be densely packed with keel worms, sea squirts, sponges and crustaceans, but at a quick glance you’d think there was nothing there. Always check the tide times first and leave everything as you found it – gently replacing stones the right way up.

Finally, do you plan to write any more books in the future?

Our rock pools are so incredibly diverse that I might never run out of material for more books. However, I’m also passionate about the importance of giving people, especially children, better opportunities to connect with the natural world. We protect and care about the things that we love, so it’s vital that we all feel that we are a part of the ecosystems on which we depend. Perhaps that will be my next writing project?

A limited number of signed copies are available at NHBS, order now to avoid disappointment!

If you’re feeling inspired to go out rock-pooling, we have created a selection of essential books and equipment to help you get started!

The NHBS Guide to Kick Sampling

Freshwater invertebrates Credit: Katharine Clayton

The presence or absence of freshwater invertebrates such as caddisfly (Trichoptera) and mayfly (Ephemeroptera) larvae, dragonfly and damselfly nymphs (Odonata) and planaria (Tricladida) can be used to provide an indicator of the health status of waterways.

Kick sampling is a useful method for collecting these and other invertebrates from shallow waters and one of the key techniques used in monitoring freshwater invertebrates in rivers. The technique involves agitating the stones or sediment of a river or stream by foot and catching the sample in a sturdy hand net that is held downstream. Stones and logs can also be washed off carefully into the net and samples are usually taken both from faster flowing riffles and still areas of the river. The sample is then rinsed out of the net into a tray full of water for sorting and identification. Kick sampling is primarily a qualitative technique, to look at species diversity or presence/absence, but quantitative measures can be taken if a quadrat or transect is used on the floor of the water body to limit the sampling area and sampling time is controlled.

Scientist sorting biological net samples at a wetland

NHBS manufactures a range of hand nets that are the industry standard for kick sampling and are widely used by environment agencies and ecological professionals. Our Professional Hand Nets conform to the Environment Agency standards and we are the official Riverfly Partnership supplier. The Riverfly Partnership is a network of organisations bringing together anglers, conservationists, entomologists and relevant water authorities whose aim is to protect and monitor the water quality of our rivers.

The NHBS net range also includes smaller nets designed for students of all ages and a wide range of accessories and books to help with sample sorting and identification. Our hand nets are manufactured with a diverse range of net bags and handles to meet a wide variety of surveying purposes. We can also design and manufacture bespoke net designs in our workshop in Devon, so please do get in touch if you have special requirements.

Professional Hand Nets

The NHBS Professional Hand Net has been used for over 30 years in Environment Agency monitoring and was purpose designed to be lightweight, strong and long-lasting, with individual nets often still being used after ten years. Key features of the Professional Hand Nets include:

The net bag is protected by the outer frame to minimise abrasion when kick sampling on stony surfaces.
A range of mesh sizes are available, making it the ideal net for aquatic surveying of all macro- and microinvertebrates in shallow water. The bag mesh is either made from 1mm or 2mm woven polyester or precision welded nylon mesh (53µm to 500µm) and manufactured to international standards so that the mesh will stay the same shape and size, even under stress.
The inner brass frame securely holds the bag away from the stony substrate and also allows the bag to be removed for sterilisation between sites.
The comfortable handle is available in either a lightweight FSC wooden or aluminium version and both will float in water. Two-part and three-part sectional wooden handles are also available, which can be unscrewed for transport or extended with extra sections.

Student Hand Nets

The Professional Hand Net is also available in a smaller Student version that is 200mm in width. This is designed to the same high quality as the larger Professional net but is ideal for educational use. The Student Hand Net is available with either a FSC wooden or aluminium handle and with net bag mesh sizes ranging from 250µm to 2mm, in standard 280mm or 380mm depth. We can design and manufacture bespoke nets so please do contact us with any requirements.

Lightweight Eco-Nets

The Lightweight Eco-Net has a strong aluminium frame that will withstand regular use both for kick sampling and pond dipping. Net heads are 160mm in width and 1mm and 2mm mesh bags are available to fit this frame. Bags attach to the head using industrial hook and loop strapping, making them easy to remove for replacement or sterilisation.

Riverfly Partnership Approved Kit

The Anglers’ Riverfly Monitoring Initiative (ARMI) is coordinated by the Riverfly Partnership and involves anglers and conservation volunteers from more than 100 partner organisations carrying out regular freshwater invertebrate surveys to check for severe changes in water quality. The Riverfly Partnership Approved Kit has been designed in conjunction with the Riverfly Partnership and contains everything the volunteers need to carry out these vital surveys: Professional Hand Net, bucket, sample trays, pipettes, freshwater invertebrate ID guide, spoon, brush and magnifiers.

Banner Net

The Banner Net is a rectangular net measuring 90 x 100cm that is supported on each side by a 120cm wooden pole. The bottom edge of the net is reinforced with a removable, flexible rubber rod. Two hook and loop tabs keep the net rolled neatly when not in use. Available with 500mm mesh, which is ideal for kick sampling of benthic macroinvertebrates.

Kick Sampling Accessories

The Freshwater Name Trail

This 8-page fold-out chart is a fully illustrated key to help users identify the main animal groups found in freshwater. None of the identification in the key goes beyond family level, and some of it stays at the phylum or class.

Freshwater Life of Britain and Northern Europe

A beautifully illustrated guide to the wide variety of species found in rivers, streams, lakes and ponds in Britain and Europe.

See our complete range of kick sampling equipment online.

Rocky Shores: an interview with John Archer-Thomson and Julian Cremona

Rocky Shores is the seventh installment of the popular British Wildlife Collection.

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!

Other books by Julian Cremona

Extreme Close-Up Photography and Focus Stacking – Julian Cremona

Beyond Extreme Close-Up Photography – Julian Cremona

Rocky Shores is published by Bloomsbury Publishing and signed copies are available for pre-order, while stocks last.

Planning a trip

Equipment and method

What could you see?

Spider Crab (Maja squinado)

Velvet Swimming Crab (Necora puber)

Common Lobster (Homarus gammarus)

Candy Striped Flatworm (Prostheceraeus vittatus)

Spiny Starfish (Marthasterias glacialis)

Lesser-Spotted Catshark (Scyliorhinus canicula)

Plaice (Pleuronectes platessa)

Greater Pipefish (Syngnathus acus)

European Cuttlefish (Sepia officinalis)

Moon Jellyfish (Aurelia aurita)

Common Eelgrass (Zostera marina)

Oarweed (Laminaria digitata)

What could you find?

Natural

Mermaid’s purse

Marine worm tubes

By-the-wind Sailor (Velella velella)

Common Whelk eggs (Buccinum undatum)

Fossils

Seashells

Cuttlebone

Manmade

Fishing gear

Other plastics

Kira Prouse

How plankton are responsible for the smell of the sea

When and where to find seaweed

Ten common species to look for

Brown seaweeds:

Bladder wrack (Fucus vesiculosus)

Knotted wrack (Ascophylum nodosum)

Spiral wrack (Fucus spiralis)

Serrated wrack (Fucus serratus)

Oarweed (Laminaria digitata)

Sugar kelp (Saccharina latissimi)

Green seaweeds:

Sea lettuce (Ulva lactua)

Gutweed (Ulva intestinalis)

Red seaweeds:

Carrageen (Chondrus crispus)

Purple laver (Porphyra umbilicalis)

Further reading

What you need:

When and where to go:

What to do:

Pond dipping equipment and books:

Creating your own pond:

**Bladder wrack (Fucus vesiculosus)**

**Knotted wrack (Ascophylum nodosum)**

**Spiral wrack (Fucus spiralis)**

**Serrated wrack (Fucus serratus)**

**Oarweed (Laminaria digitata)**

**Sugar kelp (Saccharina latissimi)**

**Sea lettuce (Ulva lactua)**

**Gutweed (Ulva intestinalis)**

**Carrageen (Chondrus crispus)**

**Purple laver (Porphyra umbilicalis)**