Diving of great shearwaters (Puffinus gravis) in cold and warm water regions of the South Atlantic Ocean

 

Show simple item record

dc.contributor.author Ronconi, Robert A en_ZA
dc.contributor.author Ryan, Peter G en_ZA
dc.contributor.author Ropert-Coudert, Yan en_ZA
dc.date.accessioned 2015-11-11T14:28:51Z
dc.date.available 2015-11-11T14:28:51Z
dc.date.issued 2010 en_ZA
dc.identifier.citation Ronconi, R. A., Ryan, P. G., & Ropert-Coudert, Y. (2009). Diving of great shearwaters (Puffinus gravis) in cold and warm water regions of the South Atlantic Ocean. PloS one, 5(11), e15508-e15508. doi:10.1371/journal.pone.0015508 en_ZA
dc.identifier.uri http://hdl.handle.net/11427/14931
dc.identifier.uri http://dx.doi.org/10.1371/journal.pone.0015508
dc.description.abstract BACKGROUND: Among the most widespread seabirds in the world, shearwaters of the genus Puffinus are also some of the deepest diving members of the Procellariiformes. Maximum diving depths are known for several Puffinus species, but dive depths or diving behaviour have never been recorded for great shearwaters ( P. gravis ), the largest member of this genus. This study reports the first high sampling rate (2 s) of depth and diving behaviour for Puffinus shearwaters. METHODOLOGY/PRINCIPAL FINDINGS: Time-depth recorders (TDRs) were deployed on two female great shearwaters nesting on Inaccessible Island in the South Atlantic Ocean, recording 10 consecutive days of diving activity. Remote sensing imagery and movement patterns of 8 males tracked by satellite telemetry over the same period were used to identify probable foraging areas used by TDR-equipped females. The deepest and longest dive was to 18.9 m and lasted 40 s, but most (>50%) dives were <2 m deep. Diving was most frequent near dawn and dusk, with <0.5% of dives occurring at night. The two individuals foraged in contrasting oceanographic conditions, one in cold (8 to 10°C) water of the Sub-Antarctic Front, likely 1000 km south of the breeding colony, and the other in warmer (10 to 16°C) water of the Sub-tropical Frontal Zone, at the same latitude as the colony, possibly on the Patagonian Shelf, 4000 km away. The cold water bird spent fewer days commuting, conducted four times as many dives as the warm water bird, dived deeper on average, and had a greater proportion of bottom time during dives. Conclusions/Significance General patterns of diving activity were consistent with those of other shearwaters foraging in cold and warm water habitats. Great shearwaters are likely adapted to forage in a wide range of oceanographic conditions, foraging mostly with shallow dives but capable of deep diving. en_ZA
dc.language.iso eng en_ZA
dc.publisher Public Library of Science en_ZA
dc.rights This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. en_ZA
dc.rights.uri http://creativecommons.org/licenses/by/4.0 en_ZA
dc.source PLoS One en_ZA
dc.source.uri http://journals.plos.org/plosone en_ZA
dc.subject.other Birds en_ZA
dc.subject.other Foraging en_ZA
dc.subject.other Habitats en_ZA
dc.subject.other Oceanography en_ZA
dc.title Diving of great shearwaters (Puffinus gravis) in cold and warm water regions of the South Atlantic Ocean en_ZA
dc.type Journal Article en_ZA
dc.rights.holder © 2010 Ronconi et al en_ZA
uct.type.publication Research en_ZA
uct.type.resource Article en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Science en_ZA
dc.publisher.department Percy FitzPatrick Institute of African Ornithology en_ZA
uct.type.filetype Text
uct.type.filetype Image


Files in this item

This item appears in the following Collection(s)

Show simple item record

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Except where otherwise noted, this item's license is described as This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.