Carrion preference in Australian coastal raptors: Effects of urbanisation on scavenging

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Thomson, VK
Stevens, T
Jones, D
Huijbers, C
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2016
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Ongoing urbanisation and increasing human populations threaten many natural systems including coastal ecosystems. Scavenging coastal raptors are important biological vectors between marine and terrestrial ecosystems and are significantly affected by urbanisation in south-east Queensland, Australia. Little is known on the effects of human activity on Australia's coastal raptor community, including possible influences on foraging ecology. We surveyed four locations on the Gold Coast, Queensland to compare the assemblages and to test whether urbanised locations altered the preference of four Australian coastal raptor species for types of carrion prey of either marine or terrestrial origin (mullet and quail) using baited camera sampling techniques. PERMANOVA analyses showed a significant difference in raptor abundance between urban and non-urban settings. With limited sampling, no significant difference was found for carrion preference. However, a clear trend was seen with White-bellied Sea-Eagles Haliaeetus leucogaster preferring mullet, and Whistling Kites Haliastur sphenurus preferring quail in non-urban settings. No bait was taken in urban locations. This study suggests that increasing urbanisation on the Gold Coast significantly influences where coastal raptors forage. This urbanisation also raises questions concerning the foraging territories and home ranges of these raptors, and whether these effects occur more broadly. The mechanised rubbish collecting practices in place on the Gold Coast also point to concerns about other, more subtle impacts of coastal expansion on the local scavenging community.

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The Sunbird

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46

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1

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© 2016 Birds Queensland. The attached file is reproduced here in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.

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Zoology

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