A framework for predicting species extinction by linking population dynamics with habitat loss

Conservation Letters

Andrew J. Tanentzap²  Susan Walker²  R. T. Theo Stephens¹ 

[1] Department of Conservation, Private Bag 1930, Dunedin 9054, New Zealand;Landcare Research, Private Bag 1930, Dunedin 9054, New Zealand

关键词: Extinction crisis;    fragmentation;    island biogeography;    metapopulations;    sampling theory;    species–area relationship;   

DOI  :  10.1111/j.1755-263X.2011.00221.x

来源: Wiley

【 摘 要 】

Abstract

Conservation policy requires reliable estimates of extinction rates that consider the interactions between population size (N) and habitat area. Current approaches to estimating extinction from the endemics–area relationship (EAR) estimate only the minimum number of species that can become extinct because of habitat loss (instantaneous extinction). EARs will therefore underestimate extinction if small populations and/or habitat area (SPHA) commit species to future extinction. We demonstrate this mathematically, by assuming species require a minimum population size of two individuals, and by randomly sampling habitat loss within stem-mapped forest plots. We then develop a general framework for incorporating SPHA effects into EARs that builds upon recent advances introducing N into estimates of extinction. By accounting for effects that modify N, our framework explains extinction debt and reduces the uncertainty associated with future estimates of extinction through carefully qualifying the spatial and temporal context of predictions.

【 授权许可】

Unknown   
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