Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/57929
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Type: Journal article
Title: Pragmatic population viability targets in a rapidly changing world
Author: Traill, L.
Brook, B.
Frankham, R.
Bradshaw, C.
Citation: Biological Conservation, 2010; 143(1):28-34
Publisher: Elsevier Sci Ltd
Issue Date: 2010
ISSN: 0006-3207
Statement of
Responsibility: 
Lochran W. Traill, Barry W. Brook, Richard R. Frankham and Corey J.A. Bradshaw
Abstract: To ensure both long-term persistence and evolutionary potential, the required number of individuals in a population often greatly exceeds the targets proposed by conservation management. We critically review minimum population size requirements for species based on empirical and theoretical estimates made over the past few decades. This literature collectively shows that thousands (not hundreds) of individuals are required for a population to have an acceptable probability of riding-out environmental fluctuation and catastrophic events, and ensuring the continuation of evolutionary processes. The evidence is clear, yet conservation policy does not appear to reflect these findings, with pragmatic concerns on feasibility over-riding biological risk assessment. As such, we argue that conservation biology faces a dilemma akin to those working on the physical basis of climate change, where scientific recommendations on carbon emission reductions are compromised by policy makers. There is no obvious resolution other than a more explicit acceptance of the trade-offs implied when population viability requirements are ignored. We recommend that conservation planners include demographic and genetic thresholds in their assessments, and recognise implicit triage where these are not met. © 2009 Elsevier Ltd. All rights reserved.
Keywords: Census N
Ecological triage
Effective population size
Global change
Minimum viable population
Threatened species
Rights: Copyright © 2009 Elsevier Ltd All rights reserved.
DOI: 10.1016/j.biocon.2009.09.001
Appears in Collections:Aurora harvest 5
Earth and Environmental Sciences publications
Environment Institute Leaders publications

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