Navigation Links
Conservation targets too small to stop extinction

Conservation biologists are setting their minimum population size targets too low to prevent extinction.

That's according to a new study by University of Adelaide and Macquarie University scientists which has shown that populations of endangered species are unlikely to persist in the face of global climate change and habitat loss unless they number around 5000 mature individuals or more.

The findings have been published online in a paper 'Pragmatic population viability targets in a rapidly changing world' in the journal Biological Conservation.

"Conservation biologists routinely underestimate or ignore the number of animals or plants required to prevent extinction," says lead author Dr Lochran Traill, from the University of Adelaide's Environment Institute.

"Often, they aim to maintain tens or hundreds of individuals, when thousands are actually needed. Our review found that populations smaller than about 5000 had unacceptably high extinction rates. This suggests that many targets for conservation recovery are simply too small to do much good in the long run."

A long-standing idea in species restoration programs is the so-called '50/500' rule. This states that at least 50 adults are required to avoid the damaging effects of inbreeding, and 500 to avoid extinctions due to the inability to evolve to cope with environmental change.

"Our research suggests that the 50/500 rule is at least an order of magnitude too small to effectively stave off extinction," says Dr Traill. "This does not necessarily imply that populations smaller than 5000 are doomed. But it does highlight the challenge that small populations face in adapting to a rapidly changing world."

Team member Professor Richard Frankham, from Macquarie University's Department of Biological Sciences, says: "Genetic diversity within populations allows them to evolve to cope with environmental change, and genetic loss equates to fragility in the face of such changes."

Conservation biologists worldwide are battling to prevent a mass extinction event in the face of a growing human population and its associated impact on the planet.

"The conservation management bar needs to be a lot higher," says Dr Traill. "However, we shouldn't necessarily give up on critically endangered species numbering a few hundred of individuals in the wild. Acceptance that more needs to be done if we are to stop 'managing for extinction' should force decision makers to be more explicit about what they are aiming for, and what they are willing to trade off, when allocating conservation funds."

Contact: Dr Lochran Traill, Environment Institute, Univ of Adelaide
University of Adelaide

Related biology news :

1. Tropical insects go the distance to inform rainforest conservation
2. Springer will publish Journal of Coastal Conservation
3. Conservation International and Toyota partner to protect Philippines rain forests
4. Why conservation efforts often fail
5. The conservation lens
6. Soil, conservation experts to reflect on Hurricane Katrina disaster
7. The importance of mangrove conservation in tsunami prone regions
8. Great Ape Trust awards $127,000 for international conservation efforts
9. Wildlife Conservation Society study finds seasonal seas save corals with tough love
10. New study finds biodiversity conservation secures ecosystem services for people
11. Manomet Center awarded major NFWF grant to foster shorebird conservation
Post Your Comments:
(Date:11/2/2015)... MENLO PARK, Calif. , Nov. 2, 2015 /PRNewswire/ ... to $9 million to provide preclinical development services to ... Under the contract, SRI will provide scientific expertise, modern ... a wide variety of preclinical pharmacology and toxicology studies ... --> --> The PREVENT Cancer Drug ...
(Date:10/29/2015)... RESTON, Va. , Oct. 29, 2015 ... announced today that it has released a new version ... Daon customers in North America ... gains. IdentityX v4.0 also includes a FIDO UAF ... customers are already preparing to activate FIDO features. These ...
(Date:10/29/2015)... 29, 2015 NXTD ) ... focused on the growing mobile commerce market and ... StackCommerce, a leading marketplace to discover and buy ... smart wallet on StackSocial for this holiday season. ... the "Company"), a biometric authentication company focused on ...
Breaking Biology News(10 mins):
(Date:11/25/2015)... ... 25, 2015 , ... A long-standing partnership between the Academy ... been formalized with the signing of a Memorandum of Understanding. , AMA Executive ... Karl Minter and Capt. Albert Glenn Tuesday, November 24, 2015, at AMA Headquarters ...
(Date:11/24/2015)... ... 24, 2015 , ... The United States Golf Association (USGA) today announced Dr. ... Award. Presented annually since 1961, the USGA Green Section Award recognizes an individual’s distinguished ... , Clarke, of Iselin, N.J., is an extension specialist of turfgrass pathology in ...
(Date:11/24/2015)... ... November 24, 2015 , ... International Society for ... of the premier annual events for pharmaceutical manufacturing: 2015 Annual Meeting. The conference ... ISPE hosted the largest number of attendees in more than a decade. ...
(Date:11/24/2015)... (PRWEB) , ... November 24, 2015 , ... The Academy ... Special Interest Group (SIG), MultiGP, also known as Multirotor Grand Prix, to represent the ... last few years. Many AMA members have embraced this type of racing and several ...
Breaking Biology Technology: