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Oct

16

2009
 
 

Greater Expectations



Higher population targets are needed to conserve species, scientists say

Man climbing ladderConservationists are setting population targets too low to give species a decent shot at long-term survival, researchers argue in Biological Conservation.

The team notes that small populations can fall prey to multiple threats, including inbreeding, lower genetic diversity, catastrophes, and birth and death rate fluctuations. To have a reasonable chance of weathering these problems, species must have a minimum population size of at least 5,000 adults, the authors concluded after reviewing the scientific literature.

Conservation organizations often set their targets much lower because they must contend with practical limits. In that sense, they are in a bind similar to the one faced by climate scientists who must compromise on emissions reduction goals, the researchers write. Still, they say, conservation biologists are obligated to provide a “scientific reality check” and make the consequences of lower targets clear to policymakers. – Roberta Kwok

Source: Traill, L., Brook, B., Frankham, R., & Bradshaw, C. (2009). Pragmatic population viability targets in a rapidly changing world Biological Conservation DOI: 10.1016/j.biocon.2009.09.001

Image © sturti, iStockPhoto.com

Filed Under Biodiversity, Endangered species, Socio-political issues | 

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