Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/70547
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Type: Journal article
Title: The SAFE index: using a threshold population target to measure relative species threat
Author: Clements, G.
Bradshaw, C.
Brook, B.
Laurance, W.
Citation: Frontiers in Ecology and the Environment, 2011; 9(9):521-525
Publisher: Ecological Society of America
Issue Date: 2011
ISSN: 1540-9295
1540-9309
Statement of
Responsibility: 
Gopalasamy Reuben Clements, Corey JA Bradshaw, Barry W Brook and William F Laurance
Abstract: The International Union for Conservation of Nature (IUCN) Red List is arguably the most popular measure of relative species threat, but its threat categories can be ambiguous (eg “Endangered” versus “Vulnerable”) and subjective, have weak quantification, and do not convey the threat status of species in relation to a minimum viable population target. We propose a heuristic measure that describes a “species’ ability to forestall extinction”, or the SAFE index. We compare the abilities of the SAFE index with those of another numerically explicit metric – percentage range loss – to predict IUCN threat categories using binary and ordinal logistic regression. Generalized linear models showed that the SAFE index was a better predictor of IUCN threat categories than was percentage range loss. We therefore advocate use of the SAFE index, possibly in conjunction with IUCN threat categories, because the former indicates the “distance from extinction” of a species, while implicitly incorporating population viability as a variable.
Rights: © The Ecological Society of America
RMID: 0020114441
DOI: 10.1890/100177
Appears in Collections:Earth and Environmental Sciences publications
Environment Institute Leaders publications

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