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Nestedness in fragmented landscapes: birds of the box-ironbark forests of south-eastern Australia

MacNally, Ralph, Horrocks, Gregory and Bennett, Andrew 2002, Nestedness in fragmented landscapes: birds of the box-ironbark forests of south-eastern Australia, Ecography: pattern and diversity in ecology, vol. 25, pp. 651-660, doi: 10.1034/j.1600-0587.2002.250602.x.

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Title Nestedness in fragmented landscapes: birds of the box-ironbark forests of south-eastern Australia
Author(s) MacNally, Ralph
Horrocks, Gregory
Bennett, Andrew
Journal name Ecography: pattern and diversity in ecology
Volume number 25
Start page 651
End page 660
Publisher Blackwell Munksgaard
Place of publication Copenhagen, Denmark
Publication date 2002
ISSN 0906-7590
1600-0587
Summary Nestedness in biota as a function of species richness – biota of depauperate assemblages being non-random subsets of richer biotas – has been widely documented in recent years (see Wright et al. 1998, Oecologia 113: 1–20). Ordering sites by richness maximizes nestedness indices; however, ordering by other criteria such as area or isolation may be more ecologically interpretable. We surveyed birds in true fragments (35 in all), and in "reference areas" in large extant forest blocks (30 locations), of the same range of areas (10, 20, 40, 80 ha). The avifauna was divided into "bush birds"– species dependent on forest and woodland, and "open country" species. We looked at nestedness in four data sets: "bush birds" in fragments and reference areas, and "all birds" in fragments and in reference areas. All data sets were significantly nested. Ordering by area in all cases was not significantly less nested than ordering by richness. Ordering by area in fragments was significantly greater than in reference areas, but the differences in standardized nestedness indices were small (<15%). We identified those birds that had distributions among fragments that conformed strongly with area, those that were more randomly distributed and some species that were more likely to occupy the smallest fragments. Among the latter was a hyperaggressive, invasive, colonial native species (noisy miner Manorina melanocephala). A suite of small, insectivorous birds were more likely to strongly conform with expected distributions in relation to area, which was consistent with observations of their vulnerability to the effects of the noisy miner in smaller fragments.
Language eng
DOI 10.1034/j.1600-0587.2002.250602.x
Field of Research 050104 Landscape Ecology
Socio Economic Objective 970105 Expanding Knowledge in the Environmental Sciences
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2002, Blackwell Munksgaard
Persistent URL http://hdl.handle.net/10536/DRO/DU:30008491

Document type: Journal Article
Collections: School of Ecology and Environment
Higher Education Research Group
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