Trajectories from extinction: Where are missing mammals rediscovered?

Fisher, Diana O. (2011) Trajectories from extinction: Where are missing mammals rediscovered?. Global Ecology and Biogeography, 20 3: 415-425. doi:10.1111/j.1466-8238.2010.00624.x


Author Fisher, Diana O.
Title Trajectories from extinction: Where are missing mammals rediscovered?
Journal name Global Ecology and Biogeography   Check publisher's open access policy
ISSN 1466-822X
1466-8238
Publication date 2011-05
Year available 2010
Sub-type Article (original research)
DOI 10.1111/j.1466-8238.2010.00624.x
Volume 20
Issue 3
Start page 415
End page 425
Total pages 11
Editor Martin T. Sykes
Tim M. Blackburn
David J. Currie
Place of publication Oxford, U.K
Publisher Wiley-Blackwell Publishing
Collection year 2011
Language eng
Formatted abstract
Aim  To determine where mammals that are presumed to be extinct are most likely to be rediscovered, and to test predictions of two hypotheses to explain trajectories of decline in mammals. Range collapse is based on the premise that extinction rates at the edge of species ranges are highest because habitat is suboptimal, so declining species are predicted to survive longer near the centre of their ranges. We predicted that under range collapse, remnant populations are most likely be rediscovered within their former core range. Conversely, if threats usually spread across ranges, declining species will be pushed to the periphery (range eclipse), so rediscoveries are predicted at the edge of the pre-decline range. If so, species would be more likely to be rediscovered in marginal habitat, and at higher elevations than the sites from which they disappeared.

Location  World-wide.

Methods  Using data on 67 species of mammals which have been rediscovered, I tested whether species were disproportionately rediscovered in the outer 50% of their former range area or at higher elevations than their last recorded locations, and which species characteristics were associated with rediscovery location and habitat change, using both the phylogenetic generalized least squares method to account for phylogenetic non-independence and linear models of raw species data.

Results  Species affected by habitat loss were more likely to be rediscovered at the periphery than the centre of their former range, consistent with range eclipse caused by the spread of habitat destruction. High human population pressure predicted which species changed habitat between their previous records and rediscovery. Coastal species experienced higher human population densities, and were more likely to be rediscovered at the periphery of their former ranges, and there was some evidence of an up-slope shift associated with higher human populations at lower elevations.

Main conclusion  The locations of rediscoveries of species affected by habitat loss were consistent with range eclipse through a mechanism of spreading habitat loss and human population pressure, rather than with range collapse. Searches for mammals that have declined from habitat loss should include range edges and marginal habitat, especially in areas of high human population density.
© 2010 Blackwell Publishing Ltd
Keyword Biological invasion
Elevation
Extinction trajectory
Habitat loss
Mammals
Overkill
Rediscovery
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Article first published online: 23 DEC 2010.

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2011 Collection
School of Biological Sciences Publications
 
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Created: Sun, 13 Mar 2011, 13:50:02 EST by Gail Walter on behalf of School of Biological Sciences