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Rates of Movement of Threatened Bird Species between IUCN Red List Categories and toward Extinction

Brooke, M., Butchart, S. H. M., Garnett, Stephen T., Crowley, Gabriel M., Mantilla-Beniers, N. B. and Stattersfield, A. J. (2008). Rates of Movement of Threatened Bird Species between IUCN Red List Categories and toward Extinction. Conservation Biology,22(2):417-427.

Document type: Journal Article

IRMA ID 78220986xPUB42
Title Rates of Movement of Threatened Bird Species between IUCN Red List Categories and toward Extinction
Author Brooke, M.
Butchart, S. H. M.
Garnett, Stephen T.
Crowley, Gabriel M.
Mantilla-Beniers, N. B.
Stattersfield, A. J.
Journal Name Conservation Biology
Publication Date 2008
Volume Number 22
Issue Number 2
ISSN 0888-8892   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-41849122647
Start Page 417
End Page 427
Total Pages 11
Place of Publication US
Publisher Wiley-Blackwell Publishing
Field of Research 0501 - Ecological Applications
0608 - Zoology
0799 - Other Agricultural and Veterinary Sciences
HERDC Category C1 - Journal Article (DEST)
Abstract In recent centuries bird species have been deteriorating in status and becoming extinct at a rate that may be 2–3 orders of magnitude higher than in prehuman times. We examined extinction rates of bird species designated critically endangered in 1994 and the rate at which species have moved through the IUCN (World Conservation Union) Red List categories of extinction risk globally for the period 1988–2004 and regionally in Australia from 1750 to 2000. For Australia we drew on historical accounts of the extent and condition of species habitats, spread of invasive species, and changes in sighting frequencies. These data sets permitted comparison of observed rates of movement through the IUCN Red List categories with novel predictions based on the IUCN Red List criterion E, which relates to explicit extinction probabilities determined, for example, by population viability analysis. The comparison also tested whether species listed on the basis of other criteria face a similar probability of moving to a higher threat category as those listed under criterion E. For the rate at which species moved from vulnerable to endangered, there was a good match between observations and predictions, both worldwide and in Australia. Nevertheless, species have become extinct at a rate that, although historically high, is 2 (Australia) to 10 (globally) times lower than predicted. Although the extinction probability associated with the critically endangered category may be too high, the shortfall in realized extinctions can also be attributed to the beneficial impact of conservation intervention. These efforts may have reduced the number of global extinctions from 19 to 3 and substantially slowed the extinction trajectory of 33 additional critically endangered species. Our results suggest that current conservation action benefits species on the brink of extinction, but is less targeted at or has less effect on moderately threatened species.
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Created: Fri, 01 May 2009, 14:29:59 CST by Sarena Wegener