Martine Maron is currently a lecturer in the Department of Biological and Physical Sciences at the University of Southern Queensland (Toowoomba, Qld 4350, Australia. Email: email@example.com). This work was conducted through the Arthur Rylah Institute for Environmental Research (123 Brown Street, Heidelberg, Vic., Australia) for the Victorian Department of Primary Industries as part of their Ecologically Sustainable Agriculture Initiative.
Agricultural change and paddock tree loss: Implications for an endangered subspecies of Red-tailed Black-Cockatoo
Article first published online: 10 NOV 2005
Ecological Management & Restoration
Volume 6, Issue 3, pages 206–211, December 2005
How to Cite
Maron, M. (2005), Agricultural change and paddock tree loss: Implications for an endangered subspecies of Red-tailed Black-Cockatoo. Ecological Management & Restoration, 6: 206–211. doi: 10.1111/j.1442-8903.2005.00238.x
- Issue published online: 10 NOV 2005
- Article first published online: 10 NOV 2005
- agricultural intensification;
- endangered species;
- landscape change;
- paddock trees;
- Red-tailed Black-Cockatoo;
- tree loss
Summary Natural senescence and the intensification of agricultural practices are contributing to the continuing loss of paddock trees from agricultural regions in Australia. This is of particular concern in the southern Wimmera of western Victoria, where much of the endangered Buloke (Allocasuarina luehmannii) Woodland vegetation community is represented only by relict Buloke trees in paddocks, which also constitute critical feeding habitat for the endangered south-eastern subspecies of the Red-tailed Black-Cockatoo (Calyptorhynchus banksii graptogyne). I investigated the rate and correlates of loss of scattered Buloke trees in paddocks by examining aerial photographs taken over a period of 15 years in a region undergoing agricultural intensification. Tree loss over the period was measured using aerial photographs of five localities, covering a total of 7850 ha of agricultural land in the southern Wimmera. The average rate of loss (± 1 SE) was 25.8% ± 6.4% over the 15 years, or 1.7% per annum. The rate of tree loss was higher in areas under cultivation (32.5%) than areas under pasture (20.6%). A disproportionate number of trees was lost from locations where centre pivot irrigation systems were installed. Because of the slow growth rate of Buloke trees, revegetation efforts and offset planting are unlikely to compensate for losses of Red-tailed Black-Cockatoo habitat for approximately 100 years.