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Differences and congruencies between PVA packages: the importance of sex ratio for predictions of extinction risk

Brook, Barry W., Burgman, M. A. and Frankham, Richard (2000). Differences and congruencies between PVA packages: the importance of sex ratio for predictions of extinction risk. Conservation Ecology,4(1):6.

Document type: Journal Article
Citation counts: Scopus Citation Count Cited 23 times in Scopus Article | Citations
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Title Differences and congruencies between PVA packages: the importance of sex ratio for predictions of extinction risk
Author Brook, Barry W.
Burgman, M. A.
Frankham, Richard
Journal Name Conservation Ecology
Publication Date 2000
Volume Number 4
Issue Number 1
ISSN 1195-5449   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-33947209743
Start Page 6
Total Pages 1
Publisher Resilience Alliance Publications
HERDC Category C1 - Journal Article (DEST)
Abstract Population viability analysis (PVA) is used in conservation biology to predict extinction probabilities for threatened species. Previous studies have revealed large differences between the predictions of PVA modeling packages, but these comparisons included a range of nonstandard factors. A standardized comparison of five PVA packages (GAPPS, INMAT, RAMAS Metapop, RAMAS Stage, and VORTEX) was conducted on six examples (two mammals, tow birds, one reptile, and a hypothetical bird/mammal-like life history). The individual-based packages (GAPPS and VORTEX) predicted a consistently higher risk of extinction than their matrix-based counterparts (INMAT and the RAMAS programs). This arose as only the former considered the effect of demographic stochasticity in the sex ratio. The difference was eliminated when only females were modeled in the matrix-based PVA packages.
Keywords demographic stochasticity
extinction risk
individual-based models
matrix-based models
model comparison
parameter estimation
population viability analysis
sex ratio
population viability analysis
conservation
wolves
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