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Where exactly do ground-foraging woodland birds forage? Foraging sites and microhabitat selection in temperate woodlands of southern Australia

journal contribution
posted on 2008-08-08, 00:00 authored by Mark Antos, Andrew Bennett, John WhiteJohn White
Bird assemblages in woodlands of southern Australia are characterised by a high proportion of ground-foraging species, many of which are experiencing population declines. We examined the foraging sites of 13 species of ground-foraging birds, including four common species and nine declining species, in four study areas representing different woodland types. Microhabitat features were recorded within a 3-m radius of observed foraging points and compared with random points. Significant differences between foraging and random plots were detected for all but one species, clearly indicating selection for foraging habitat. However, levels of dissimilarity between foraging and random plots were low, suggesting that much of the woodland study area is suitable for foraging. Microhabitat features of particular importance for multiple species were a low density of trees and shrubs, a high cover of native herbs, and fallen timber on the ground. Sites amidst dense trees tended not to be used. Several species had more particular requirements, such as the Diamond Firetail (Stagonopleura guttata) for grass cover and the White-winged Chough (Corcorax melanorhamphos) for litter cover. There was no evidence that declining species showed a greater degree of selection or were more restricted in the availability of foraging microhabitats than common species. Several of the key attributes of preferred foraging sites, such as tree density, can be actively managed at the local scale. A heterogeneous ground layer is needed to provide suitable foraging habitat for the full suite of ground-foraging birds. Achieving suitable heterogeneity in present-day woodlands will require careful and active management of various disturbance processes.

History

Journal

Emu

Volume

108

Issue

3

Pagination

201 - 211

Publisher

CSIRO

Location

Collingwood, Vic.

ISSN

0158-4197

eISSN

1448-5540

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2008, CSIRO