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Longline fisheries and foraging distribution of flesh-footed Shearwaters in Eastern Australia

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Thalmann, S and Baker, GB and Hindell, MA and Tuck, G (2009) Longline fisheries and foraging distribution of flesh-footed Shearwaters in Eastern Australia. Journal of Wildlife Management, 73 (3). pp. 399-406. ISSN 0022-541X

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Abstract

Incidental seabird mortality associated with bycatch during longline commercial fishing is a conservation concern. An initial step to estimating likelihood of seabird bycatch and conceiving conservation strategies is determining amount of overlap between foraging birds and commercial fishing effort, identifying oceanographic features associated with foraging birds, and quantifying dive characteristics. We tracked 24 adult flesh-footed shearwaters (Puffinus carneipes) breeding on Lord Howe Island located east of Australia during incubation and early and late chick-rearing periods from 6 January to 17 April 2005. At-sea foraging distribution of flesh-footed shearwaters was primarily confined within the jurisdictional Australian Fishing Zone. Foraging was strongly associated with sea-surface temperature >248 degrees C. Spatial and temporal overlap of longline fishing with foraging shearwaters varied throughout the breeding season, but was greatest (63% overlap) during early chick-rearing. Mean maximum distance reached from the breeding colony during a foraging event was 804 km (SD 280) from Lord Howe Island. Foraging behavior was strongly diurnal, with 91% of dives occurring during daylight, and most dives (77%) were <5 m. Given that longline fishing and flesh-footed shearwaters overlap substantially, the Australian Fisheries Management Authority should consider implementing additional regulations to further reduce bycatch. Conservation strategies such as setting longlines at nights may reduce flesh-footed shearwater bycatch.

Item Type: Article
Keywords: Australian Fishery Zone, flesh-footed shearwaters, geolocation, habitat utilization, longline fishery, Puffinus carneipes, seabird bycatch.
Journal or Publication Title: Journal of Wildlife Management
Page Range: pp. 399-406
ISSN: 0022-541X
Identification Number - DOI: 10.2193/2007-461
Date Deposited: 21 Sep 2009 04:20
Last Modified: 18 Nov 2014 04:05
URI: http://eprints.utas.edu.au/id/eprint/9236
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