Discrimination among potential buloke (Allocasuarina luehmannii) feeding trees by the endangered south-eastern redtailed black-cockatoo (Calyptorhynchus banksii graptogyne)

Maron, Martine and Lill, Alan (2004) Discrimination among potential buloke (Allocasuarina luehmannii) feeding trees by the endangered south-eastern redtailed black-cockatoo (Calyptorhynchus banksii graptogyne). Wildlife Research, 31 (3). pp. 311-317. ISSN 1035-3712

Abstract

Remnant buloke (Allocasuarina luehmannii) woodland and scattered buloke trees appear to provide an important seasonal food resource for the endangered south-eastern `. The factors that differed between buloke trees in which the cockatoos fed and those in which they did not feed were investigated in two consecutive years (Season 1 and Season 2). Tree diameter at breast height (DBH), individual mean seed dry mass, individual mean cone dry mass, mean number of seeds per cone, and proportion of total cone massmprising seeds (seed ratio) were all significantly greater in feeding than non-feeding trees in both Season 1 and Season 2. A predictive model incorporating these five variables correctly classified 82% of trees measured in Season 1 as either feeding or non-feeding trees. Validation of predictive models with new data is essential in evaluating model performance, and so the model was used to classify the feeding and non-feeding trees from which the variables were recorded during Season 2. The model, although derived only from the data collected during Season 1, was equally as effective in predicting the feeding status of trees in Season 2, despite the fact that trees the cockatoos fed in during the second year were not the same individual trees as those used in the previous year. The differences between feeding and non-feeding trees suggest that cockatoos choose to feed in trees in which they are able to optimise their foraging efficiency. As individual buloke trees appear to vary in their suitability for cockatoo foraging from year to year, it is not possible to exclude any buloke within the range of the cockatoo as a potential future food resource for this endangered bird.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Authors' final corrected manuscript version. Deposited in accordance with the copyright policy of the publisher.
Depositing User: Ms Sandy Sharman
Faculty / Department / School: Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited: 11 Oct 2007 00:56
Last Modified: 02 Jul 2013 22:41
Uncontrolled Keywords: remnant buloke woodland; Allocasuarina luehmannii; red-tailed black-cockatoo; Calyptorhynchus banksii graptogyne
Fields of Research (FOR2008): 06 Biological Sciences > 0602 Ecology > 060208 Terrestrial Ecology
05 Environmental Sciences > 0501 Ecological Applications > 050104 Landscape Ecology
05 Environmental Sciences > 0502 Environmental Science and Management > 050202 Conservation and Biodiversity
Socio-Economic Objective (SEO2008): D Environment > 96 Environment > 9608 Flora, Fauna and Biodiversity > 960806 Forest and Woodlands Flora, Fauna and Biodiversity
Identification Number or DOI: doi: 10.1071/WR03079
URI: http://eprints.usq.edu.au/id/eprint/2060

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