title: Dynamics of extinction debt across five taxonomic groups.
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.
authors.affiliation: Department of Biological Applications and Technology, Faculty of Health Sciences, University of Ioannina, 45110 Ioannina, Greece.
authors.forename: John M
authors.initials: JM
authors.lastname: Halley
authors.affiliation: Department of Biological Applications and Technology, Faculty of Health Sciences, University of Ioannina, 45110 Ioannina, Greece.
authors.forename: Nikolaos
authors.initials: N
authors.lastname: Monokrousos
authors.affiliation: Department of Ecology, School of Biology, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
authors.forename: Antonios D
authors.initials: AD
authors.lastname: Mazaris
authors.affiliation: Natural History Museum of Utah, 301 Wakara Way, University of Utah, Salt Lake City, Utah 84108, USA.
authors.forename: William D
authors.initials: WD
authors.lastname: Newmark
authors.affiliation: Department of Ecology, School of Biology, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
authors.forename: Despoina
authors.initials: D
authors.lastname: Vokou
mesh_terms: D017753:Ecosystem; D053476:Extinction, Biological; D006207:Half-Life; D008962:Models, Theoretical; D010802:Phylogeny; D013045:Species Specificity; D013997:Time Factors