Conservationists condemn France’s protest over UK’s bottom-trawling ban | Fishing

France has been accused of hypocrisy by conservationists over a fresh post-Brexit dispute with the UK over fishing rights.

France launched an official protest after the UK banned bottom trawling from parts of its territorial waters last month, with the aim of protecting vulnerable habitats.

The ban on bottom trawling – a hugely damaging fishing technique that drags heavy nets along the seabed – covers British as well as EU vessels, and applies to 13 marine protected areas (MPAs), covering 4,000 sq km.

French diplomats claimed the move breached the EU-UK Trade and Cooperation Agreement (TCA), which could lead to punitive measures against the UK if an arbitration tribunal rules in France’s favour.

Charles Clover, director of the Blue Marine Foundation, a UK-based conservation organisation, said the TCA clearly permitted fishing restrictions provided they were applied equally.

“This is hypocrisy by the French,” he said. “They are not looking at the small print.

“They are playing a ludicrous ideological game against their own rightwing parties, grabbing back support from the trawlermen and not looking at what the rules are.”

The Paris-based environmental group Bloom said it would consider legal action against France if it continued the dispute.

Claire Nouvian, head of Bloom, said the French president, Emmanuel Macron, was showing the world his true ideological stripes.

“It is an embarrassment for France, who say they are champions of the world’s oceans, to do this,” she said.

“It highlights the discrepancy between their words and their actions. If they keep going down that route, we will look into litigation ourselves to sue the French government.”

Many trawlers operating out of Boulogne depend on the restricted areas for much of their catch. Far-right politicians have backed the trawler operators, with Rassemblement National, the parliamentary party led by Marine Le Pen, stepping up rhetoric on the issue.

The party in the northern Hauts-de-France region, in a post on X, accused the UK of threatening the survival of the industry.

Last year, an editorial in Nature magazine described France – which held a global oceans summit in 2022 and is hosting next year’s UN ocean conference – as being among the countries undermining progress towards ocean sustainability because it opposed a ban on bottom trawling in marine protected areas in the EU.

In 2022, France, the UK and Costa Rica launched the High Ambition Coalition for Nature & People to push for protecting 30% of land and sea by 2030 (known as the “30×30” target).

Nouvian said: “The TCA language is precise. It’s not discrimination to implement what the scientists have been saying and what member states have been talking about in their 30×30 plans.”

She noted that all member states were expected to ban bottom trawling in MPAs by 2030 under the EU’s ocean action plans.

A UK government spokesperson said: “We are proud of our strong record of safeguarding our oceans and the precious species that depend on them. The recent decision to prohibit bottom trawling, which applies to all vessels –including British ones – followed extensive consultation with a range of stakeholders, including UK and French fishing organisations.

“It represents a significant step in protecting our vulnerable and ecologically valuable rock and reef habitats, where the scientific evidence has demonstrated the negative impact of bottom-towed fishing gear.”

Officials from the European Commission were meeting their French and UK counterparts on Monday to discuss the issue.

A commission spokesperson said: “We are having a meeting to share information on adopted, or about to be adopted, measures, as part of our technical exchanges.”

It is the second dispute this year over the UK’s marine conservation measures. In February, Denmark and Sweden asked the EU to intervene after the UK closed part of the Dogger Bank fishing grounds in the North Sea to protect seabirds.

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Climate crisis increasing frequency of deadly ocean upwells, study finds | Oceans

A climate-disrupted ocean is pushing sharks, rays and other species to flee ever-hotter water in the tropics, only for them to be killed by increasingly intense upwells of cold water from the depths, a study has found.

One of the authors of the paper described the “eerie” aftermath of a mass die-off of more than 260 marine organisms from 81 species in a singular event of extreme cold upwelling off the coast of South Africa in 2021.

The paper, published in Nature Climate Change on Monday, found that shifts in ocean currents and pressure systems driven by climate breakdown were increasing the frequency and intensity of upwellings, which may in turn increase the vulnerability of migratory species such as bull sharks.

Scientists focused on the mass die-off event in 2021, which they were able to track in unusually precise detail because one of affected creature that survived was a bull shark that had been satellite tagged. They found it had been caught in water that fell more than 10C below the temperature that such tropical species were used to.

The paper details how the shark changed its behaviour in an attempt to avoid the cold areas. It swam much closer to the surface than normal and moved outside its normal migration pattern.

Many of the affected sea creatures’ carcasses washed up on the shore of South Africa, including the pup of a big manta ray that had been aborted by its traumatised mother.

“It was eerie to see so many species washed up dead,” said Ryan Daly, one of the authors of the paper. He said he was surprised that even the very mobile species, such as manta rays and bull sharks, were caught in the upwelling. “You’d think they would have swum away but they got squeezed. They couldn’t escape,” he said.

To understand the broader trends behind the die-off, the scientists tagged other sharks and used 41 years of sea surface temperature data and 33 years of wind records to investigate the frequency and intensity of cold “killer events” inshore of the Indian Ocean’s Agulhas current and the east Australian current in the past 30 years.

They found cold upwelling events had increased in frequency and intensity in these regions between 1981 and 2022. Other species killed in such events include whale sharks, convict surgeonfish, bigeye trevallies and common blacktip sharks.

Tagged bull sharks appeared to change their behaviour to avoid sudden temperature drops by swimming closer to the surface, sheltering in bays and estuaries and only moving to the extent of their poleward distribution during warm seasons.

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The marine biologists worked with oceanographers to map upwelling trends and forecast what could happen in the future as climate disruption becomes ever more pronounced and extreme cold upwellings increase in frequency along with periods of extreme surface heat.

Within individual species, certain groups tend to live on the edge of their population range. Daly said these groups were most vulnerable to the sudden and protracted temperature shifts. “There are bull sharks that run the gauntlet of a cool area to get to thermal refuges. Upwellings could kill off this unique genetic diversity.”

He said the findings suggested the need for a new approach to marine conservation that incorporated knowledge about the increasingly complex ways that climate chaos is affecting marine species. “We need to think about expanding conservation areas and prioritising different species,” he said. “We need to think out of the box.”

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Global heating pushes coral reefs towards worst planet-wide mass bleaching on record | Climate crisis

Global heating has pushed the world’s coral reefs to a fourth planet-wide mass bleaching event that is on track to be the most extensive on record, US government scientists have confirmed.

Some 54% of ocean waters containing coral reefs have experienced heat stress high enough to cause bleaching, the National Oceanic and Atmospheric Administration’s Coral Reef Watch said.

A global bleaching event is declared when at least 12% of corals in each of the main ocean basins – Pacific, Atlantic and Indian – experience bleaching-level heat stress within a 12-month period. The declaration also requires confirmed reports of bleaching.

Coral Reef Watch also confirmed the world’s largest coral reef system – Australia’s Great Barrier Reef – had been through its most widespread heat stress event on record in 2024.

The first global bleaching event happened in 1998 with 20% of the ocean’s reef corals exposed to a level of heat stress high enough to cause bleaching. The second event, in 2010, saw 35% reaching that threshold, and the third from 2014 to 2017 peaked at 56%.

Dr Derek Manzello, the Coral Reef Watch director, told the Guardian the current bleaching was likely to surpass the previous most widespread event soon “because the percentage of reef areas experiencing bleaching-level heat stress has been increasing by roughly 1% per week”.

NOAA’s threshold for the onset of bleaching relates to the amount of accumulated heat corals are facing at any given time, known as degree heating weeks.

For example, a 1 DHW is accumulated if corals are subjected to temperatures 1C above the usual maximum for seven days. Coral Reef Watch considers 4 DHWs as a bleaching threshold.

Great Barrier Reef suffering ‘most severe’ coral bleaching on record – video

Coral reefs are rich in biodiversity and provide habitat to a quarter of all marine species while covering less than 1% of ocean area. Reefs provide food and tourism income to millions of people and protect coastlines, but are considered to be one of the most vulnerable ecosystems to global heating.

The current global event started in early 2023 and in the northern hemisphere summer reefs across the Americas bleached from record levels of heat stress.

Mass bleaching has been confirmed throughout the tropics, NOAA said, including Florida, the Caribbean, Brazil, many countries across the south Pacific, the Middle East and in parts of the Indian Ocean from Indonesia’s west coast to reefs off east Africa.

Quick Guide

What is coral bleaching?

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Coral bleaching describes a process where the coral animal expels the algae that live in their tissues and give them their colour and much of their nutrients.

Without their algae, a coral’s white skeleton can be seen through their translucent flesh, giving a bleached appearance.

Mass coral bleaching over large areas, first noticed in the 1980s around the Caribbean, is caused by rising ocean temperatures.

Some corals also display fluorescent colours under stress when they release a pigment that filters light. Sunlight also plays a role in triggering bleaching.

Corals can survive bleaching if temperatures are not too extreme or prolonged.  But extreme marine heatwaves can kill corals outright.

Coral bleaching can also have sub-lethal effects, including increased susceptibility to disease and reduced rates of growth and reproduction.

Scientists say the gaps between bleaching events are becoming too short to allow reefs to recover.

Coral reefs are considered one of the planet’s ecosystems most at risk from global heating. Reefs support fisheries that feed hundreds of millions of people, as well as supporting major tourism industries.

The world’s biggest coral reef system – Australia’s Great Barrier Reef – has suffered seven mass bleaching events since 1998, of which five were in the past decade. 

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Prolonged and severe bleaching can kill corals, but if temperatures fall quickly enough the animals can recover. Research has found previously bleached corals find it harder to reproduce and can be more susceptible to disease after bleaching.

Manzello said global heating had combined with a global El Niño to push up sea surface temperatures. He said predictions made by scientists decades ago about the fate of corals in a warming world were now coming to pass.

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“The bottom line is that as coral reefs experience more frequent and severe bleaching events, the time they have to recover is becoming shorter and shorter. Current climate models suggest that every reef on planet Earth will experience severe, annual bleaching sometime between 2040 and 2050.”

Prof Ove Hoegh-Guldberg, a pioneer of coral research who was among the first to link bleaching to global heating, said: “It’s a shock. We clearly have to prevent governments from investing in fossil fuels, or we won’t have a chance in hell [to save reefs].”

Earlier this year, Coral Reef Watch was forced to add three new alert levels to its global coral bleaching warning system to represent ever-increasing extremes.

Prof Tracy Ainsworth, the vice-president of the International Coral Reef Society, said the bleaching had extended to some of the most remote places on Earth.

“Globally we are failing to protect coral reefs and the communities that rely upon them. This is neglect on a global scale,” Ainsworth said.

The Great Barrier Reef is now suffering its fifth mass bleaching in eight years. Coral Reef Watch data shows 80% of the reef was subjected to bleaching-level heat stress in 2024, the highest extent on record and above the previous high of 60% seen in 2017.

Dr Roger Beeden, the chief scientist at the Australian government’s Great Barrier Reef Marine Park Authority, said it was more important than ever to see global action on climate change.

“But the prognosis is not good for coral reefs as we know them, and the GBR is not immune. We are certainly not giving up on reefs, but they’re under serious pressure.”

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Dragons, sea toads and the longest creature ever seen found on undersea peaks off South America | Marine life

Squat lobsters, bright red sea toads and deep-sea dragon fish were among more than 160 species never previously seen in the region that were spotted on a recent expedition exploring an underwater mountain range off the coast of South America. Researchers from the California-based Schmidt Ocean Institute believe that at least 50 of those species are likely to be new to science.

Underwater mountain ranges are oases of life and biodiversity, where communities of different organisms band together: some creatures make the most of the elevation and unique currents that the peaks provide, while others find refuge in the nooks and crannies of the rocky slopes to build intricate structures.

Erin Easton, of the University of Texas Rio Grande Valley, was the chief scientist on the 40-day research voyage along the Salas y Gómez ridge, which spans the waters from Chile to Rapa Nui, also known as Easter Island. “We’re still astounded by what we observed,” she says.

  • Top left: A Coronaster starfish recorded on the south-western flank of Rapa Nui; right: a deep-sea dragon fish, an apex predator with large jaws and fang-like teeth, seen off the Salas y Gómez ridge; above: a Diadema sea urchin spotted north of Motu Motiro Hiva, an uninhabited island along the Salas y Gómez ridge

As Easton’s research team collected data on 10 peaks along the 2,900km range of 110 seamounts, they spotted unique communities on each one. Species included sea toads among the various fish, crustaceans such as pale squat lobsters, molluscs, “gardens” of glass sponges, deep-water coral reefs, galaxy siphonophores – giant thread-like creatures that use bioluminescence to hunt and may be the longest animal ever recorded.

As these seamounts sit in an area of ocean where the water is so clear that the sun’s beams penetrate further into the water than anywhere else in the world, the scientists also found some of the deepest-known organisms that depend on photosynthesis.

They found a species of photosynthetic wrinkle coral (Leptoseris) 197 metres below the surface – 25 metres deeper than previously recorded – as well as crustose coralline algae at 350 metres.

  • Top: The deepest-known photosynthesis-dependent wrinkle coral (Leptoseris) recorded to the north of Motu Motiro Hiva; bottom left, a hydroid seen on the northern side of Rapa Nui; right, Chrysogorgia coral and a squat lobster on the northern edge of Motu Motiro Hiva

“Pinks and magentas and light greens and dark green – and then you start seeing some oranges mixed in there too. It’s beautiful,” says Easton.

“It’s like you are driving a car down a dark road at night with the headlights on and all you can see is what is in front of you. The fact that we discovered so much, without even looking off to the side, [means] we clearly are missing so much more.”

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Earthworm crowned UK invertebrate of the year by Guardian readers | Wildlife

It’s a political earthquake! The common earthworm, the soil-maker, food provider and grand recycler, is the landslide winner of the inaugural UK invertebrate of the year competition.

Lumbricus terrestris, also known as the lob worm, dew worm and nightcrawler, took a mighty 38% of the popular vote after readers nominated it to be added to the shortlist for the Guardian contest.

The rare and endangered shrill carder bee demonstrated the popular affection for bumblebees by coming second with 15% of the vote while the romantics’ choice, the glowworm, narrowly beat the unexpectedly popular distinguished jumping spider into bronze medal position with 9% of the vote.

Chris Packham, whose plea for the disrupter of the shortlist, the Asian or yellow-legged hornet made the front page of the Daily Star, said: “Through constant wriggling and extraordinary ecological commitment it’s great to see the earthworm take top spot. Although I suspect vote rigging by blackbirds, badgers and moles.”

The nature writer and campaigner Dr Amy-Jane Beer said: “Stop the press, here’s an award that really means something! In a media obsessed with the rare and beautiful, for the overwhelming importance of a cold, slimy, mostly unseen creature long associated with a kind of mute, spineless, humility to receive public recognition is a big deal.”

The invertebrate charity Buglife also welcomed the earthworm’s triumph. “It’s great news,” said David Smith, Buglife’s advocacy and social change officer. “These ecosystem engineers go about their lives often unnoticed yet are vital for producing the food we eat and easing the impacts of flooding. Unfortunately, earthworms are under threat from multiple sources including chemical use, invasive species, and intensive land use, hopefully with its new title, the public will support these vital invertebrates and take action to help them thrive.”

“A man may fish with the worm that hath eat of a king, and eat of the fish that hath fed of that worm,” declared Hamlet, baffling Claudius the King in Shakespeare’s play but hailing the recycling prowess of the earthworm.

Earthworms can bring 40 tonnes of soil to the surface per hectare a year in Britain. Their usefulness is increasingly hailed in an era where regenerative farmers and many others are paying new attention to soil health.

Worms make soils less prone to flooding in winter and less baking hard in summer, they boost microbial activity and, of course, are vital in supporting plant growth, including the crops that feed us.

As well as being important, earthworms lead long (up to six years in captivity) and wondrous lives, and their charisma is well appreciated by those great connoisseurs of the living world, children. One of many readers who nominated the earthworm was Lily, four, who appreciated their “soft” feel in the hand and their general wiggly appeal.

The common earthworm appears on the surface – especially during damp and wet times, hence its other names, dew worm and rain worm – and is one of those precious invertebrates who we can see almost daily, and help too. I always feel better about myself if I stop mid-stride and rescue a stranded worm from the pavement or road.

Unfortunately, like so many other common invertebrates, earthworms are disappearing: the UK’s first national assessment, in 2023, found that populations are estimated to have declined by a third over the past 25 years.

It is not just on farmland where declines are occurring, probably due to pesticides and intensive ploughing, but in broadleaved woodlands – suggesting that wider factors such as climate change and pollution from animal worming including treatments for pets are driving losses.

Surprisingly the most traditionally beautiful animals on the shortlist, the swallowtail butterfly and the Clifden nonpareil moth, polled modestly, finishing in sixth and 10th place respectively.

The naturalist and author Dominic Couzens said: “There’s no doubt that the earthworm is a worthy winner, but perhaps that reflects the grey sky of our troubled times? Perhaps one day we will go with a feelgood selection, such as the sumptuously glamorous Clifton nonpareil or swallowtail?”

Bringing up the rear on the shortlist with just 0.8% of the vote was the Asian or yellow-legged hornet, an invasive species known for attacking honeybee colonies which was nevertheless championed by Packham, who made the case for tackling the biodiversity crisis rather than scapegoating one species, which humans are to blame for spreading.

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Record number of river barriers removed across Europe in 2023 | Rivers

Europe removed a record number of dams and other barriers from its rivers in 2023, a report has found, helping to restore its disturbed waterways to their natural states.

Nearly 500 barriers were taken out of European rivers last year, according to figures compiled by Dam Removal Europe, an increase of 50% from the year before.

France led the way in helping rivers recover, with 156 removals, the report found, followed by Spain, Sweden and Denmark. The UK removed 36 barriers.

“It is amazing to witness another record-breaking year for dam removals in European rivers,” said Herman Wanningen, the director of the World Fish Migration Foundation and co-founder of Dam Removal Europe.

Europe’s rivers have been fragmented by dams, weirs, culverts and fords – many of which are no longer needed. An estimated 150,000 of the 1.2m barriers in European waterways are obsolete and possibly dangerous, according to the report, which documented 113 deaths involving river barriers in Europe since 2000.

Dam Removal Europe, a coalition of seven environmental groups including WWF and The Nature Conservancy, which aims to restore the free-flowing state of rivers and streams, said the pace of removals was rising.

It highlighted the removal of a quarry weir in Scotland, where a steep gorge blocked heavy machinery and meant the weir had to be removed by hand, along with the removal of a series of dams on the Hiitolanjoki River in Finland, where 34 miles (54km) of river has been opened up to salmon after being blocked for more than a century.

The EU’s proposed nature restoration law – the fate of which hangs in the balance after last-minute lobbying from member states – aims to reconnect 25,000km of fragmented river by 2030. But achieving this “will require a paradigm shift in river restoration”, according to a study in Nature that highlighted the “widespread impacts” caused by small barriers. Although large dams get the most attention, the researchers found that nine in 10 European river barriers are less than 5 metres high.

Connecting rivers helps wildlife travel and allows migratory fish to reach breeding grounds. Removing dams also allows water levels to vary over the year, which can cause habitat changes that increase the diversity of plants and animals, said Pol Huguet, a city councillor in the Spanish town of Manresa, whichremoved a dam as part of a rewilding project. He said: “Thanks to this change, for the first time, we have seen some fish going upstream to this part of the river.”

Dam removals are not always popular. When Poland removed its first big dam in 2021, most people in the area objected despite risks to their safety due to poor construction, a study found in February.

As carbon pollution heats the planet, allowing air to hold more moisture, the risks of extreme rainfall collapsing ageing river barriers is rising. At least three river barriers collapsed last year due to heavy rain in Norway, Northern Ireland, and Slovenia, the report found. Last week, a dam burst in the Orsk region of Russia as heavy rains flooded the area and forced more than 100,000 people across Russia and Kazakhstan to flee.

Obsolete barriers that were built to cope with different climates harmed the river and increased nature loss, said Wanningen. “It’s time to rethink the way we manage our rivers by removing all obsolete barriers and letting as many rivers as possible flow freely. A river that does not flow freely is slowly dying.”

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Country diary: All of life is in these farmyard geese | Environment

There’s a hissing noise, then a peal of nervous laughter. The grey gander is on the rampage again, chasing anyone who comes within a few metres of him and his goose. Usually the pair are sedate, waddling around together, orange beaks grazing the grass. They’re just another couple of farmyard characters among an assorted bunch of dogs, horses and a tailless cat. But spring is here, and aggression levels have risen with the sap.

This pair of geese have been here for a quarter of a century. Back in his youth, the male was even more assertive, he’d block the little lane, then as the cars tentatively tried to edge past, he’d attack the moving tyres. Like swans, these heavy geese, weighing in at up to 10kg, can cause injury to people. For this old boy, it is all bluster.

The female is a likely descendant of Embden geese, one of the largest goose breeds and a domesticated version of the wild greylag. Geese were commonly kept on farms, for meat, eggs and grass mowing. They also loudly and shrilly honk if there is a nighttime intruder, so they can be useful burglar alarms.

‘Spring is here, and aggression levels have risen with the sap.’ Photograph: Kate Blincoe

There’s a comedy to the way they waddle around the place together, occasionally terrorising innocent people. But, of course, behind many comedies, there is often tragedy.

The female has just laid her clutch of eggs. Every spring now for nearly 20 years, her nest has failed. It’s not for want of trying: the nest spot is perfectly selected, out of sight and avoiding the strongest sun; she plucks her chest bare to cushion her nest with the softest feathers; and she sits diligently for 28 days, the usual incubation period.

But at a certain point, after the eggs should have hatched, she will have to decide that it is no longer worth sitting and the nest will be abandoned. Goose fertility declines rapidly after only five or so peak breeding years. My dad is wondering about buying a couple of goslings or fertilised eggs and trying to infiltrate them into her nest when she is away feeding. For now, though, we wait with her for the inevitable, somehow also wondering if some miracle late goslings will arrive this year.

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Country diary 1974: adders find their place in the northern sun | Reptiles

NORTHUMBERLAND and DURHAM: The viper or adder is a common enough reptile of these two northern counties. They seem to put in an appearance as the weather turns warmer. Adders love to lie coiled on some rock in the rays of the sun. You often see them lying on the unpaved forest tracks which run through heatherland and the vast conifer forests. The southern flanks of the Rothbury Hills are a favourite place for adders. Early this year I was up on Simonside, which on a clear day can be seen from the city of Newcastle upon Tyne. There on the forest road lay what I at first took to be a length of abandoned rope. As I approached I saw the coil move. It was a big adder and it was sunning itself on the unmetalled road. I estimated its length at over two feet and its sex as female for the she-adder is nearly always larger than the male. It was certainly the biggest adder I have ever seen and I have seen many. When I touched it with the tip of my stick it raised its head and shot out a flickering black Y-shaped tongue.

To the naturalist the British snakes are fairly easily distinguished for there are but three species here: the grass or ringed snake, which is a greenish olive; the adder or viper, which is decidedly marked in black and grey; and the smooth snake, which is a rare reptile frequenting isolated localities in the far south of England.

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Ways to solve a crisis in our national parks | Biodiversity

It is of deep concern to see the core funding for national parks fall, and it is widely known that the UK has a considerable challenge to tackle nature depletion and the biodiversity crisis (National parks in England and Wales failing on biodiversity, say campaigners, 9 April).

There should be an overhaul of how parks are funded to emphasise these issues, and how actions by all interest groups, from landowners to tenant farmers, can be supported towards positive outcomes and maintaining livelihoods.

There is excellent work being carried out by some organisations within our national parks. Wild Ennerdale and Wild Haweswater represent excellent coordinated efforts among wider stakeholders to tackle historic biodiversity depletion and work towards sustainable agroecology.

Cairngorms Connect is working with many stakeholders towards a holistic ecological restoration in the Cairngorms national park, including large-scale peatland restoration. The North York Moors national park, via its woodland grant schemes, is embarking on woodland establishment on a large scale, bringing potential for many ecosystem benefits, including biodiversity gains.

As a researcher in this area, I am proud to work with some of these organisations to learn how to best implement these approaches for biodiversity gain and sustainable rural livelihoods, and we should be using these, and the many other projects as inspiration for much wider work across our national parks and beyond.
Dr Robert Mills
University of York

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‘We found 700 different species’: astonishing array of wildlife discovered in Cambodia mangroves | Endangered habitats

One of the most comprehensive biodiversity surveys ever carried out in a mangrove forest has revealed that an astonishing array of wildlife makes its home in these key, threatened habitats.

Hundreds of species – from bats to birds and fish to insects – were identified during the study of the Peam Krasop sanctuary and the adjacent Koh Kapik Ramsar reserve in Cambodia. Hairy-nosed otters, smooth-coated otters, large-spotted civets, long-tailed macaques and fishing cats, as well a wide range of bat species, were among the residents recorded by the survey, which was funded by the conservation group Fauna & Flora International. The variety of wildlife has staggered biologists.

Smooth-coated otters in the mangroves. Photograph: Fauna & Flora/FCEE

“We found 700 different species in these mangrove forests but we suspect we have not even scratched the surface,” said Stefanie Rog, the leader the survey team, whose report is published on Sunday. “If we could look at the area in even greater depth we would find 10 times more, I am sure.”

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Mangrove forests form narrow strips of tangled, wooded land on coasts in tropical and subtropical latitudes. They are important because they are made up of trees that have adapted to grow in salt or brackish water, which most other plants cannot tolerate. However, over the past few decades, the planet has lost about 40% of its mangroves, which have often been chopped down to make way for beach resorts or agriculture.

Yet mangroves play critically important roles in protecting the land and its inhabitants. Their waters provide nurseries for commercially important fish, for example. “We found young barracudas, snappers and groupers in the waters here,” said Rog. “They are clearly important breeding places for fish and provide local communities with food as well as providing stock for commercial fisheries.”

Mangroves also protect inland areas from tsunamis and storms, trap carbon far more efficiently than other types of woodland, and act as refuges for a stunning array of animals, as the new study revealed through its extensive use of camera traps, nets, fish and insect estimates, and “transect” surveys – studies conducted along a straight line drawn through the landscape.

A macaque monkey in Tanjung Puting national park. Photograph: Juan Pablo Moreiras/Juan Pablo Moreiras/Fauna & Flora

A key example of the strange species found in the Cambodian mangroves is the fishing cat, Prionailurus viverrinus. Slightly larger than a domestic breed, it is powerfully built, with short limbs and a stocky body, and – unlike most other cats – is happy to swim. Its front toes are partially webbed and its claws protrude, aiding its ability to catch prey, mainly fish and rats, which it stalks while hidden in mangrove roots.

“It’s very rare to see a fishing cat and we have only found out that they are in the forest from the photo­graphs taken by our camera traps,” said Rog.

“Mangroves are places of roots and mud and they are difficult for humans to get into, which is why they provide precious sanctuaries for these vulnerable animals.”

An even rarer animal, the hairy-nosed otter, was also photographed by camera traps in some of the older parts of the mangrove forest. Lutra sumatrana uses hairs around its nose to detect its prey, which is made up of crustaceans, molluscs and other creatures.

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The Peam Krasop mangrove forest: the survey team found 700 species including 74 species of fish in the coastal waters. Photograph: FFI R5/Steph Baker/Fauna & Flora

It is the rarest otter in Asia and on the verge of extinction – and that is an issue of real concern, said Rog. “A mangrove forest relies on all the interconnected relationships between species and if you start taking away some of those species, then slowly you will lose the functioning of the forest.”

The survey – which was also supported by the Fishing Cat Ecological Enterprise, a conservation group –discovered 74 species of fish living in the forests’ waters, as well as 150 species of birds, of which 15 are listed as near-threatened or en­dangered on the International Union for Conservation of Nature (IUCN) red list.

Scientists say that mangroves play a key role in preserving ecosystems because they act as two-way barriers between the land and the sea. They slow soil erosion into the ocean and protect coastal communities from flooding and storms.

“But it goes further than that,” added Rog. “Mangrove forests are beautiful, rich, mysterious, and harvest so much life.

“They are so much more than just an ecosystem that provides a carbon-saving service or coastal protection. They are actually beautiful in their own right. For me, there is no better feeling than to be in this unique, mythical forest, knowing there is still so much more to explore – that there is another world waiting for further discovery.”

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