Nineteen percent of the world's reptiles are estimated to be threatened with extinction, states a paper published today by the Zoological Society of London (ZSL) in conjunction with experts from the IUCN Species Survival Commission (SSC).
The study, printed in the journal of Biological Conservation, is the first of its kind summarising the global conservation status of reptiles. More than 200 world renowned experts assessed the extinction risk of 1,500 randomly selected reptiles from across the globe.
Out of the estimated 19% of reptiles threatened with extinction, 12% classified as Critically Endangered, 41% Endangered and 47% Vulnerable.
Three Critically Endangered species were also highlighted as possibly extinct. One of these, a jungle runner lizard Ameiva vittata, has only ever been recorded in one part of Bolivia. Levels of threat remain particularly high in tropical regions, mainly as a result of habitat conversion for agriculture and logging. With the lizard's habitat virtually destroyed, two recent searches for the species have been unsuccessful.
Dr. Monika Böhm, lead author on the paper: "Reptiles are often associated with extreme habitats and tough environmental conditions, so it is easy to assume that they will be fine in our changing world.
"However, many species are very highly specialised in terms of habitat use and the climatic conditions they require for day to day functioning. This makes them particularly sensitive to environmental changes," Dr. Böhm added.
Extinction risk is not evenly spread throughout this highly diverse group: freshwater turtles are at particularly high risk, mirroring greater levels of threat in freshwater biodiversity around the world. Overall, this study estimated 30% of freshwater reptiles to be close to extinction, which rises to 50% when considering freshwater turtles alone, as they are also affected by national and international trade.
Although threat remains lower in terrestrial reptiles, the often restricted ranges, specific biological and environmental requirements, and low mobility make them particularly susceptible to human pressures. In Haiti, six of the nine species of Anolis lizard included in this study have an elevated risk of extinction, due to extensive deforestation affecting the country.
Collectively referred to as 'reptiles', snakes, lizards, amphisbaenians (also known as worm lizards), crocodiles, and tuataras have had a long and complex evolutionary history, having first appeared on the planet around 300 million years ago. They play a number of vital roles in the proper functioning of the world's ecosystems, as predator as well as prey.
Head of ZSL's Indicators and Assessment Unit, Dr Ben Collen says: "Gaps in knowledge and shortcomings in effective conservation actions need to be addressed to ensure that reptiles continue to thrive around the world. These findings provide a shortcut to allow important conservation decisions to be made as soon as possible and firmly place reptiles on the conservation map,"
"This is a very important step towards assessing the conservation status of reptiles globally," says Philip Bowles, Coordinator of the Snake and Lizard Red List Authority of the IUCN Species Survival Commission. "The findings sound alarm bells about the state of these species and the growing threats that they face globally. Tackling the identified threats, which include habitat loss and harvesting, are key conservation priorities in order to reverse the declines in these reptiles."
The current study provides an indicator to assess conservation success, tracking trends in extinction risk over time and humanity's performance with regard to global biodiversity targets.
ZSL and IUCN will continue to work with collaborating organisations to ensure reptiles are considered in conservation planning alongside more charismatic mammal species.
Zoological Society of London: http://www.zsl.org
This press release was posted to serve as a topic for discussion. Please comment below. We try our best to only post press releases that are associated with peer reviewed scientific literature. Critical discussions of the research are appreciated. If you need help finding a link to the original article, please contact us on twitter or via e-mail.
The European Union's agreement to cut carbon dioxide emissions by 40 per cent by 2030 sounds impressive, but we're halfway to that already
The okapi is one of the worlds most elusive mammals. In 1904, the British explorer Percy Powell-Cotton set his sights on obtaining a specimen for his growing natural history collection. He succeeded and its skull is on display. But where is the rest of it?
Driven by the ongoing drought and the coming winter, bears are encroaching on Reno, Nevada in record numbers.
The UK's wind farms generated more power than its nuclear power stations on Tuesday, the National Grid says.
A charming and poetic account of apiculture in Mark Winston's Bee Time reminds us why an ancient partnership between humans and bees needs saving
Use of a cattle drug that has devastated vulture populations in India is in decline, offering hope of recovery – but vultures in Europe may now be at risk
The winners of the Society of Biology's third annual photography contest include amazing images of a haunting leopard, an otherworldly spider, and Yellowstone National Park's Grand Prismatic Spring.
Bee colonies in Brisbane are waging war for months on end, according to a new study, and the victorious swarms are taking over the hives of rival species.
Hundreds of thousands of cranes stop in Germany on their way to warmer climates
May, June, August and September have all been record-breaking months