A "stocktake" of UK nature suggests 60% of animal and plant species have declined in the past 50 years - and one in 10 could end up disappearing.
For the first time, 25 wildlife organisations - from the RSPB to the British Lichen Society - have collated assessments of 3,148 species.
The State of Nature report offers clues to the fate of the UK's 59,000 species.
Among those seeing the largest falls in numbers are turtle doves, water voles, red squirrels and hedgehogs.
The reasons for the decline are said to be "many and varied" but include rising temperatures and habitat degradation.
Species requiring specific habitats have fared particularly poorly compared to the generalists able to adapt to the country's changing environment.
"This report shows that our species are in trouble, with many declining at a worrying rate," said naturalist Sir David Attenborough who launched the report.
"However, we have in this country a network of passionate conservation groups supported by millions of people who love wildlife. The experts have come together today to highlight the amazing nature we have around us and to ensure that it remains here for generations to come."
Individual reports published in recent years that chart the fortunes of our bees, birds, moths and mammals have been assembled and analysed alongside ongoing studies of bats, beetles and more.
The data - collected by dedicated volunteer enthusiasts through myriad surveys - are staggering, but the report still only covers 5% of the UK's estimated 59,000 native species.
There are noticeable gaps, particularly for invertebrates, fungi and marine species, but the coalition of expertise from mosses to marine conservation is groundbreaking and Dr Fiona Burns, a lead author of the report, hopes future editions will include even more groups.
"By including those people and including their expertise, even though we've not got as much information about fungi or other groups, we can promote the importance of these groups in UK flora and fauna," she said.
"[The knowledge gaps] highlight that there are big biases in what we study, what we monitor. If we want to get an idea of the health of the eco-systems and our biodiversity we need to redress that balance."
In the past, threatened animals and plants considered "priority species" have been included on government Biodiversity Action Plans to formalise and target conservation actions to halt and reverse declines.
The State of Nature report outlines a new "watchlist indicator" which charts how populations of these species have fared in the last 50 years and the overall trend is a 77% decline, despite successes for some including bitterns and adonis blue butterflies.
Conservationists say that a definitive list of the UK's most endangered species is hard to provide because of the difficulties involved in comparing such different species - each with particular needs and issues.
But as an overview of the problems, Dr Burns highlights the following species from across 10 of the UK's diverse groups:
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Turtle doves have declined by 93% since 1970 and their plight is echoed by many other farmland birds. Agri-environment schemes to restore seed-rich habitats have been introduced to try to halt declines. |
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Hedgehogs have declined by around a third since the millennium. Intensive agriculture and urban development have fragmented habitats and gardeners are now being encouraged to make space for the mammals. |
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The small tortoiseshell butterfly, a once-common species found in gardens, has declined in abundance by 77% in the last ten years. Recent cold, wet summers and a lack of habitat are thought to be to blame. |
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Despite intensive conservation efforts natterjack toad numbers have changed little since 1990, with less than 50 breeding populations in mainland Britain. |
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Losses of European eel have been so great that it is considered at extremely high risk of extinction globally. Conservation projects, such as the one in the River Thames, aim to reverse the damage done by pollution, over-fishing and habitat loss. |
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Both the early bumblebee (Bombus pratorum) and the tormentil mining bee (Andrena tarsata) have shown strong declines in range since 1970. Both have suffered from a loss of wildflowers, the latter dependent on heathland which is recognised as a nationally vulnerable habitat. |
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The population size of the V-moth is estimated to be less than 1% of what it was in the 1960s due to habitat loss and degradation. The moths' caterpillars feed on currant and gooseberry leaves, leading to speculation that our move away from growing our own fruit could be contributing to the crash. |
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Corn cleavers, a flower found in arable fields, has undergone one of the most dramatic declines of any plant species and now only survives at the Rothamsted research station. |
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Common or harbour seals have declined by 31% in Scottish waters since 1996. The reasons for the drop in numbers are described as "mysterious" because their close cousins grey seals have not been affected in the same way. |
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There is only a single bastard gumwood tree left in the whole world located on the island of Saint Helena in the South Atlantic Ocean: a UK Overseas Territory. Efforts are currently being made to cultivate seedlings in order to restore the population. |
Source: http://www.bbc.co.uk/nature/22609000
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