Habitat fragmentation disrupts the demography of a widespread native mammal

Holland, Greg J. and Bennett, Andrew F. 2010, Habitat fragmentation disrupts the demography of a widespread native mammal, Ecography : pattern and diversity in ecology, vol. 33, no. 5, pp. 841-853.

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Title Habitat fragmentation disrupts the demography of a widespread native mammal
Author(s) Holland, Greg J.
Bennett, Andrew F.
Journal name Ecography : pattern and diversity in ecology
Volume number 33
Issue number 5
Start page 841
End page 853
Total pages 13
Publisher Wiley-Blackwell Publishing, Inc
Place of publication New York, N.Y.
Publication date 2010-10
ISSN 0906-7590
Summary Fragmentation theory predicts that population persistence should be positively correlated with the size of habitat fragments. The patterns of occurrence of many species are consistent with this prediction, but the demographic processes that determine how species respond to fragmentation are poorly understood. In addition, habitat quality may interact with fragment size as an influence on demographic performance. We investigated these predictions for the native bush rat Rattus fuscipes by testing the following hypotheses: 1) population performance (i.e. viability as determined by various demographic parameters) is positively correlated with fragment size; and 2) population performance is positively correlated with habitat quality. Populations of R. fuscipes were censused in two large (>49 ha) and eight small (<2.5 ha) forest fragments in an agricultural region of southeastern Australia. Fragments with high and low quality habitat were included in each size category. Fragment size influenced multiple aspects of population demography; populations in large fragments had higher densities, older age structures, received more potential immigrants, and were more likely to recruit adults than those in small fragments. Reproductive patterns were more predictable in large fragments. Habitat quality per se had less marked effects; adult females were heavier and subadults more prevalent in fragments with high quality habitat. However, high quality habitat enhanced population performance in small fragments more so than in large ones. Despite being widespread in the study area, R. fuscipes populations are profoundly impacted by habitat fragmentation, with population performance declining with fragment size. Studies based on patterns of species occurrence should be interpreted with caution as they may mask critical processes occurring at the population level. For a thorough understanding of the effects of habitat fragmentation, population-level studies are required.
Language eng
Field of Research 050104 Landscape Ecology
Socio Economic Objective 960806 Forest and Woodlands Flora, Fauna and Biodiversity
HERDC Research category C1 Refereed article in a scholarly journal
HERDC collection year 2010
Copyright notice ©2010, Wiley-Blackwell
Persistent URL http://hdl.handle.net/10536/DRO/DU:30032282

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