Dynamics of extinction debt across five taxonomic groups

John M. Halley (), Nikolaos Monokrousos, Antonios D. Mazaris, William D. Newmark and Despoina Vokou
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John M. Halley: Faculty of Health Sciences, University of Ioannina
Nikolaos Monokrousos: Faculty of Health Sciences, University of Ioannina
Antonios D. Mazaris: School of Biology, Aristotle University of Thessaloniki
William D. Newmark: Natural History Museum of Utah, 301 Wakara Way, University of Utah
Despoina Vokou: School of Biology, Aristotle University of Thessaloniki

Nature Communications, 2016, vol. 7, issue 1, 1-6

Abstract: Abstract Species extinction following habitat loss is well documented. However, these extinctions do not happen immediately. The biodiversity surplus (extinction debt) declines with some delay through the process of relaxation. Estimating the time constants of relaxation, mainly the expected time to first extinction and the commonly used time for half the extinction debt to be paid off (half-life), is crucial for conservation purposes. Currently, there is no agreement on the rate of relaxation and the factors that it depends on. Here we find that half-life increases with area for all groups examined in a large meta-analysis of extinction data. A common pattern emerges if we use average number of individuals per species before habitat loss as an area index: for mammals, birds, reptiles and plants, the relationship has an exponent close to a half. We also find that the time to first determined extinction is short and increases slowly with area.

Date: 2016
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DOI: 10.1038/ncomms12283

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