Cookie use on MRCVSonline
We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive all cookies.
If you would like to forward this story on to a friend, simply fill in the form below and click send.

Your friend's email:
Your email:
Your name:
 
 
Send Cancel

Researchers propose rethink of ‘endangered species’ definition
The researchers applied the ‘demographic safe space’ concept to the case of the Asian elephant.
Demographic safe space could save slow-breeding giants 

A ‘demographic safe space’ for Asian elephants has been proposed by researchers at the Smithsonian Institute in a bid to improve their conservation.

According to new research, published to coincide with Endangered Species Day (17 May), conservation decisions based on population counts may fail to protect large, slow-breeding animals, like the Asian elephant, from decline.

Lead author Dr Shermin de Silva, president and founder of Asian elephant conservation charity Trunks & Leaves, said: “Critical thresholds in so-called vital rates – such as mortality and fertility rates among males and females of various ages – can signal an approaching population collapse long before numbers drop below a point of no return.

“We propose that conservation efforts for Asian elephants and other slow-breeding megafauna be aimed at maintaining their ‘demographic safe space': that is, the combination of key vital rates that supports a non-negative growth rate.”

The study, published in Frontiers in Ecology and Evolution, suggests that a combination of key vital rates governing population increase can better indicate a species’ viability than short-term trends in population size and distribution.

“History bears this out,” said Dr de Silva. “Genomic studies of the last mammoths isolated on Wrangel Island – between Russia and Alaska – have shown that although they were able to persist for thousands of years beyond the extinction of mainland populations with just 300 individuals, they had accumulated numerous genetic mutations that may have eventually contributed to their extinction.”

This means that populations of megafauna can become biologically inviable long before they disappear if pushed beyond their ‘demographic safe space.’

The researchers applied the ‘demographic safe space’ concept to the case of the Asian elephant and found that near-optimal reproduction and high calf survival is necessary to maintain non-negative population growth.

“Measures to enhance survival of calves, and particularly females, are key to saving the Asian elephant,” said de Silva. But while the attention of the world has been focused on the ivory trade, for critically endangered Asian elephant populations the greatest threat is habitat loss – followed by illegal trade in live animals and parts.

“Habitat loss can create something known as ‘extinction debt’ by slowing down birth rates and increasing mortality rates. For slow breeding long-lived species, even incremental changes make a big difference, but their longevity can obscure the risk of extinction.”

Become a member or log in to add this story to your CPD history

Endangered turtles rescued from smugglers

News Story 1
 A group of endangered turtles have found a new home at London Zoo after being rescued from smugglers.

The four big-headed turtles arrived at the zoo at the end of last year, after smugglers tried to illegally import them to Canada, labelled as toys.

One of the turtles, named Lady Triệu after a Vietnamese warrioress, has moved to a new exhibit in the zoo’s reptile house. She is the only one of her kind in a UK zoo.

Big-headed turtles have such large heads that they cannot pull them back into their shells. To compensate, they have armour plating from head to tail and a very sharp beak to fend off predators. They are ranked number 18 on ZSL’s EDGE of Existence reptile list, which puts threatened species at the forefront of conservation action. Image © ZSL  

Click here for more...
News Shorts
RCVS Fellowship board chair elections get underway

Voting for the 2019 RCVS Fellowship Chair election is now underway. This year four candidates are standing for election, including Dr Robert Huey, Professor John Innes, Professor Liz Mossop and Professor Ian Ramsey.

The Chair will attend and preside over Fellowship meetings and take the lead in consolidating the Fellowship’s position as the learned society of the RCVS. Fellows will receive an email containing a link to the online voting form, as well as candidates’ details and manifestos. Voting closes at 5pm on Thursday, 5 September.