One in five species of reptile is threatened with extinction. A team of international scientists including researchers from the Zoological Society of London, the University of Witwatersrand (Johannesburg, South Africa), Monash University (Victoria, Australia) and the Biodiversity Assessment Unit, IUCN-Conservation International based in Washington DC (USA), have conducted a comprehensive extinction-risk assessment of the class Reptilia. Writing in the academic journal “Natural” the team conclude that at least 1,829 out of 10,196 species of reptile (21.1%) are threatened.  Twenty percent of extant reptiles threatened with extinction is astonishing.

Picture credit: Everything Dinosaur

According to the study turtles and crocodilians are particularly vulnerable to extinction.

Agriculture, Logging, Urban Development and Invasive Species

A global assessment of the risk of extinction to species of reptile has been lacking, although similar studies have been undertaken for the other tetrapods such as amphibians, mammals and birds. The researchers conclude that reptiles are threatened by the same major factors that threaten other tetrapods— agriculture, logging, urban development and invasive species, although the threat posed by climate change remains uncertain. Many species of reptile live in extremely arid or desert regions, this comprehensive study reveals that it is those reptiles that live in forests that face the greatest threat.

Reptiles Threatened with Extinction

The scientists discovered that birds, mammals and amphibians are unexpectedly good surrogates for the conservation of reptiles. The study revealed that efforts to conserve other threatened tetrapods (mammals, birds and amphibians) are more likely than expected to co-benefit many threatened species of reptile. Although reptiles are well known to inhabit arid habitats such as deserts and scrubland, most reptile species occur in forested habitats, where they and other vertebrate groups, suffer from threats such as logging and conversion of forest to agriculture. The study found that 30% of forest-dwelling reptiles are at risk of extinction, compared with 14% of reptiles in arid habitats.

Picture credit: IUCN/Anders G. J. Rhodin

An Urgent Multifaceted Plan is Needed

Neil Cox, co-leader of the study and Manager of the IUCN-Conservation International Biodiversity Assessment Unit in Washington DC stated:

“The results of the Global Reptile Assessment signal the need to ramp up global efforts to conserve them. Because reptiles are so diverse, they face a wide range of threats across a variety of habitats. A multifaceted action plan is necessary to protect these species, with all the evolutionary history they represent.”

Picture credit: IUCN/ Ignacio Roberto Hernández

The report states that although some reptiles including most species of crocodiles and turtles require urgent, targeted action to prevent extinctions, efforts to protect other tetrapods, such as habitat preservation and control of trade and invasive species, will probably also benefit many reptiles.  The conclusion from the study are stark.  Twenty percent of all extant reptiles threatened with extinction is alarming.  Conservations are demanding urgent action.

Everything Dinosaur acknowledges the assistance of a media release from the International Union for Conservation of Nature (IUCN) in the compilation of this article.

The scientific paper: “A global reptile assessment highlights shared conservation needs of tetrapods” by Neil Cox, Bruce E. Young, Philip Bowles, Miguel Fernandez, Julie Marin et al published in Nature.

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