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Foraging of white-bellied sea-eagles Haliaeetus leucogaster in relation to marine fish farms in Tasmania


Wiersma, J and Richardson, AMM, Foraging of white-bellied sea-eagles Haliaeetus leucogaster in relation to marine fish farms in Tasmania, Corella, 33, (3) pp. 71-79. ISSN 0155-0438 (2009) [Refereed Article]

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The ranging and foraging behaviour of adult male White-bellied Sea-Eagles Haliaeetus leucogaster, at three marine fish farms and three non-aquaculture sites, were studied in the breeding season (August–December 2000) by radio- telemetry. At non-aquaculture sites (Sea-Eagle nests >8km from fish farms), areas of Sea-Eagle home ranges averaged 77.2 square kilometres (minimum convex polygon) and 92.2 square kilometres (95% kernel), with a primary hunting area within four kilometres of the nest; soaring hunting flights averaged 16 kilometres, and short-stay perch-hunting sequences averaged 1.2 kilometres. At aquaculture sites (Sea-Eagle nests <3km from fish farms), elongated home ranges averaged 56.7 square kilometres (MCP) and 219.6 square kilometres (95% kernel); soaring hunting flights averaged 24 kilometres, and short-stay perch-hunting forays averaged 3.6 kilometres. Foraging efficiency may be lower at aquaculture sites, with possible consequences for energetics and therefore breeding success.

Item Details

Item Type:Refereed Article
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Fisheries sciences
Research Field:Aquaculture and fisheries stock assessment
Objective Division:Environmental Management
Objective Group:Terrestrial systems and management
Objective Field:Assessment and management of terrestrial ecosystems
UTAS Author:Wiersma, J (Mr Jason Wiersma)
UTAS Author:Richardson, AMM (Associate Professor Alastair Richardson)
ID Code:62203
Year Published:2009
Deposited By:Zoology
Deposited On:2010-03-10
Last Modified:2015-02-10
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