Foraging ecology of the Cook's petrel Pterodroma cookii during the austral breeding season: a comparison of its two populations

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dc.contributor.author Rayner, Matthew en
dc.contributor.author Hauber, ME en
dc.contributor.author Clout, Michael en
dc.contributor.author Seldon, David en
dc.contributor.author Van Dijken, S en
dc.contributor.author Bury, S en
dc.contributor.author Phillips, RA en
dc.date.accessioned 2011-11-07T20:51:54Z en
dc.date.issued 2008 en
dc.identifier.citation MAR ECOL-PROG SER 370:271-284 2008 en
dc.identifier.issn 0171-8630 en
dc.identifier.uri http://hdl.handle.net/2292/8784 en
dc.description.abstract This study examined divergence in the foraging distribution, at-sea behaviour and provisioning strategies of a small procellarid, the Cook's petrel Pterodroma cookii, during chick-rearing at 2 islands off New Zealand, separated latitudinally by similar to 1000 km. There was little overlap in foraging distribution between adults from Little Barrier Island (LBI), which ranged to the west into the Northern Tasman Sea and east into the Pacific Ocean, and conspecifics from Codfish Island (CDF), which foraged west of the South Island in the south Tasman Sea in association with the subtropical convergence zone. Although birds from CDF ranged further than those from LBI, there was no difference in mean foraging trip duration. Cook's petrels from CDF foraged over deeper, cooler water, with higher primary productivity, than conspecifics from LBI. At-sea behaviour also differed: adults from LBI spent less time in flight, and showed less variation in total flight time per day. Overall, Cook's petrels spend much more time in flight than albatrosses, and approximately the same amounts of time on the water during the night as during the day, suggesting a high portion of nocturnal foraging. Dive depths did not differ between colonies but were greater than expected for a gadfly petrel. Stable isotope signatures of blood indicated population-specific diets, and suggested that birds from LBI primarily consume cephalopods and fish, whereas those from CDF eat more crustaceans. Chicks at CDF received more food. These results suggest a broad divergence in foraging strategies between geographically well-separated colonies in response to regional differences in oceanography. en
dc.language EN en
dc.publisher INTER-RESEARCH en
dc.relation.ispartofseries Marine Ecology Progress Series en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. Details obtained from http://www.sherpa.ac.uk/romeo/issn/0171-8630/ en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.subject Foraging distribution en
dc.subject Geolocation loggers en
dc.subject Stable isotopes en
dc.subject Subtropical convergence en
dc.subject Gadfly petrel en
dc.subject NEW-ZEALAND en
dc.subject WANDERING ALBATROSSES en
dc.subject STABLE-ISOTOPES en
dc.subject TROPHIC RELATIONSHIPS en
dc.subject GEOGRAPHIC STRUCTURE en
dc.subject PELAGIC SEABIRD en
dc.subject ILES-KERGUELEN en
dc.subject BARRIER-ISLAND en
dc.subject SOUTH GEORGIA en
dc.subject STRATEGIES en
dc.title Foraging ecology of the Cook's petrel Pterodroma cookii during the austral breeding season: a comparison of its two populations en
dc.type Journal Article en
dc.identifier.doi 10.3354/meps07660 en
pubs.begin-page 271 en
pubs.volume 370 en
dc.rights.holder Copyright: INTER-RESEARCH en
pubs.end-page 284 en
dc.rights.accessrights http://purl.org/eprint/accessRights/RestrictedAccess en
pubs.subtype Article en
pubs.elements-id 79892 en
pubs.org-id Science en
pubs.org-id Biological Sciences en
pubs.record-created-at-source-date 2010-09-01 en


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