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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Mortality and survivorship of the quokka (Setonix brachyurus) (Macropodidae : Marsupialia) in the northern jarrah forest of Western Australia
Wildlife Research, Volume 32, No. 8, Year 2005
Notification
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Description
The potential for the quokka (Setonix brachyurus (Quoy & Gaimard, 1830)), a threatened macropodid marsupial, to increase in abundance following the initiation of predator control was investigated by determining the cause of deaths of radio-collared individuals. Predation was identified as a major cause of death followed by road kills. The non-parametric Kaplan-Meier method modified for staggered entry of individuals was used to estimate survivorship. Although males and females were affected differently by each cause of mortality, their overall survivorship did not differ significantly. Individuals alive at the beginning of the 25-month study had a 61% chance of surviving to the end. This represented an 81% chance of surviving for 1 year. There was no significant difference in survivorship between adults and juveniles. Current rates of adult and juvenile survivorship should allow population recovery, although none has been evident. Pouch young mortality is hypothesised to have inhibited the anticipated quokka population increase since the initiation of predator control. The observed expulsion of pouch young by females when threatened may be a primary predator avoidance strategy. © CSIRO 2005.
Authors & Co-Authors
Hayward, Matt W.
Australia, Sydney
Unsw Sydney
Australia, Perth
Wildlife Research Centre
Australia, Perth
Department of Environment and Conservation Western Australia
South Africa, Gqeberha
Nelson Mandela University
de Tores, Paul J.
Australia, Perth
Wildlife Research Centre
Augee, Michael L.
Australia, Sydney
Unsw Sydney
Banks, Peter B.
Australia, Sydney
Unsw Sydney
Statistics
Citations: 21
Authors: 4
Affiliations: 4
Identifiers
Doi:
10.1071/WR04111
ISSN:
10353712
Study Design
Cross Sectional Study
Participants Gender
Female