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The summer foraging ranges of adult spectacled petrels Procellaria conspicillata

Published online by Cambridge University Press:  14 May 2013

Tim A. Reid ,
Robert A. Ronconi ,
Richard J. Cuthbert  and
Peter G. Ryan
Tim A. Reid
Affiliation:
Percy FitzPatrick Institute of African Ornithology, DST/NRF Centre of Excellence, University of Cape Town, Rondebosch 7701, South Africa
Robert A. Ronconi
Affiliation:
Percy FitzPatrick Institute of African Ornithology, DST/NRF Centre of Excellence, University of Cape Town, Rondebosch 7701, South Africa Department of Biology, Dalhousie University, 1355 Oxford St, Halifax, Nova Scotia, Canada
Richard J. Cuthbert
Affiliation:
Royal Society for the Protection of Birds, The Lodge, Sandy, Bedfordshire, UK
Peter G. Ryan*
Affiliation:
Percy FitzPatrick Institute of African Ornithology, DST/NRF Centre of Excellence, University of Cape Town, Rondebosch 7701, South Africa
*
*Corresponding author: pryan31@gmail.com
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Abstract

Satellite transmitters were attached to eight adult spectacled petrels Procellaria conspicillata Gould captured during the early incubation period at their breeding grounds on Inaccessible Island, one of the Tristan da Cunha Islands in the central South Atlantic Ocean. Data on their at-sea distribution was obtained for up to six months. All birds remained within the South Atlantic from 24–44°S, with most between 25 and 40°S. Breeding birds mainly foraged in oceanic waters, but failed breeders or non-breeders concentrated their foraging activity over the Rio Grande Rise and the Walvis Ridge and along the shelf break off the east coast of South America. Little foraging occurred along the Benguela shelf break off southern Africa. Non-breeders favoured relatively warm water with low chlorophyll concentrations, reducing the risk of bycatch in fisheries. Tracked birds spent 16% of their time in areas with high levels of tuna longline fishing activity, with overlap greater for non-breeding birds (22%) than breeding birds (3%). Birds in this study foraged in shallower waters along the continental shelf edge off South America than spectacled petrels tracked in this area in winter, potentially increasing their risk of exposure to demersal longline fisheries in this area in summer.

Keywords

breedingdistributionfishery overlapSouth Atlantic Ocean
Type
Biological Sciences
Information
Antarctic Science , Volume 26 , Issue 1 , February 2014 , pp. 23 - 32
Copyright
Copyright © Antarctic Science Ltd 2013 

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