Factors influencing population dynamics in island and mainland populations of the Swamp Antechinus (Antechinus minimus)

Sale, Michael G, Wilson, Barbara A. and Arnould, John P. Y. 2008, Factors influencing population dynamics in island and mainland populations of the Swamp Antechinus (Antechinus minimus), Australian journal of zoology, vol. 56, no. 3, pp. 187-194.

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Title Factors influencing population dynamics in island and mainland populations of the Swamp Antechinus (Antechinus minimus)
Formatted title Factors influencing population dynamics in island and mainland populations of the Swamp Antechinus (Antechinus minimus)
Author(s) Sale, Michael G
Wilson, Barbara A.
Arnould, John P. Y.
Journal name Australian journal of zoology
Volume number 56
Issue number 3
Start page 187
End page 194
Publisher CSIRO Publishing
Place of publication Collingwood, Vic.
Publication date 2008
ISSN 0004-959X
1446-5698
Summary Simultaneously analysing demographic processes of small mammals living in different ecological contexts may help to understand mechanisms that influence the growth and decline of these populations. The size and demography of swamp antechinus (Antechinus minimus) populations located in a coastal mainland habitat and on a small offshore island in south-eastern Australia were investigated. Large demographic differences occurred between the two ecosystems, with the island population density often 100 times greater than that on the mainland. The swamp antechinus in the mainland habitat was influenced by extrinsic climatic forces, with juvenile recruitment, individual body mass and overall population size being affected by rainfall, a factor likely to influence food availability for the species. However, the island population did not appear to be affected by drought to the same degree where allochthonous marine nutrient inputs may have offset any drought-induced reduction in primary production. Significantly greater juvenile recruitment in the island habitats combined with restricted emigration and potentially reduced predation and interspecific competition are likely to be responsible for the high population densities on the island. Although island populations appear robust, future conservation efforts should focus on mainland populations given the genetic deficiencies in the island populations.
Language eng
Field of Research 060207 Population Ecology
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1 Refereed article in a scholarly journal
HERDC collection year 2008
Copyright notice ©2008, CSIRO
Persistent URL http://hdl.handle.net/10536/DRO/DU:30017830

Document type: Journal Article
Collection: School of Life and Environmental Sciences
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