Mechanisms of drought-induced population decline in an endangered wallaby

Fisher, D. O., Blomberg, S. P. and Hoyle, S. D. (2001) Mechanisms of drought-induced population decline in an endangered wallaby. Biological Conservation, 102 1: 107-115. doi:10.1016/S0006-3207(00)00200-7


Author Fisher, D. O.
Blomberg, S. P.
Hoyle, S. D.
Title Mechanisms of drought-induced population decline in an endangered wallaby
Journal name Biological Conservation   Check publisher's open access policy
ISSN 0006-3207
Publication date 2001-11-01
Sub-type Article (original research)
DOI 10.1016/S0006-3207(00)00200-7
Volume 102
Issue 1
Start page 107
End page 115
Total pages 9
Place of publication Oxford
Publisher Elsevier Science Ltd
Collection year 2001
Language eng
Subject C1
300802 Wildlife and Habitat Management
770903 Living resources (flora and fauna)
Abstract The bridled nailtail wallaby is restricted to one locality in central Queensland, Australia. The population declined severely during a major drought between 1991 and 1995. We investigated age-specific covariates of survival and proximate causes of mortality from 1994 to 1997, using mark-recapture and radio-tagging techniques at two study sites. Using a matrix population model, we also modelled the effect of drought on age-specific survival and the intrinsic rate of population increase,;,. The only significant covariate of survival for adults was a measure of health unrelated to drought. Rainfall, food, predator activity, year, sex and habitat were not associated with variation in adult survival. Juvenile survival was negatively affected by drought, and predation was the proximate cause of most juvenile deaths. The matrix projection model showed that the observed juvenile survivorship during the drought was low enough to have produced a population decline, although fecundity and survival of other age classes was high throughout the study. (C) 2001 Elsevier Science Ltd. All rights reserved.
Keyword Biodiversity Conservation
Ecology
Environmental Sciences
Macropodidae
Cmr
Matrix Model
Onychogalea Fraenata
Survival
Fluctuating Prey Populations
Bridled Nailtail Wallaby
Onychogalea-fraenata
Model Selection
Feeding Ecology
Australia
Survival
Predation
Dynamics
Marsupialia
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Biological Sciences Publications
Ecology Centre Publications
Ecology Centre Publications
 
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Created: Wed, 15 Aug 2007, 02:42:07 EST