Diving behaviour of African penguins: do they differ from other Spheniscus penguins?

dc.contributor.authorRyan, P G
dc.contributor.authorPetersen, S L
dc.contributor.authorSimeone, A
dc.contributor.authorGrémillet, D
dc.date.accessioned2016-11-14T11:06:18Z
dc.date.available2016-11-14T11:06:18Z
dc.date.issued2007
dc.date.updated2016-01-22T09:42:31Z
dc.description.abstractAfrican penguins Spheniscus demersus closely resemble Magellanic S. magellanicus and Humboldt S. humboldti penguins and have similar breeding and feeding ecologies. Adults feed on pelagic schooling fish in continental shelf waters, but African penguins have been reported to have shallower dive angles and remain submerged longer for dives to a given depth than their congeners. The few data for African penguins were gathered using relatively large time-depth recorders. We measured diving behaviour of 36 African penguins provisioning small chicks at three colonies near Cape Town, South Africa. Maximum and mean dive depths were 69m and 14m respectively. Diving took place mainly during the day. Although dive depths differed between colonies, there were no significant differences in dive duration or maximum, median or mean depth. Total dive duration, descent time, bottom time, ascent time and dive angle all were strongly correlated with the maximum depth attained. The diving behaviour of African penguins is similar to that of its congeners. Diving performance probably was compromised by the data-logger used in the previous study. Comparative data from Humboldt penguins also indicate potential biases in an earlier study of this species. Care is needed when comparing the diving performance of penguins measured using different loggers.
dc.identifierhttp://dx.doi.org/10.2989/AJMS.2007.29.2.1.184
dc.identifier.apacitationRyan, P. G., Petersen, S. L., Simeone, A., & Grémillet, D. (2007). Diving behaviour of African penguins: do they differ from other Spheniscus penguins?. <i>African Journal of Marine Science</i>, http://hdl.handle.net/11427/22529en_ZA
dc.identifier.chicagocitationRyan, P G, S L Petersen, A Simeone, and D Grémillet "Diving behaviour of African penguins: do they differ from other Spheniscus penguins?." <i>African Journal of Marine Science</i> (2007) http://hdl.handle.net/11427/22529en_ZA
dc.identifier.citationRyan, P. G., Petersen, S. L., Simeone, A., & Grémillet, D. (2007). Diving behaviour of African penguins: do they differ from other Spheniscus penguins?. African Journal of Marine Science, 29(2), 153-160.
dc.identifier.issn1814-232X
dc.identifier.ris TY - Journal Article AU - Ryan, P G AU - Petersen, S L AU - Simeone, A AU - Grémillet, D AB - African penguins Spheniscus demersus closely resemble Magellanic S. magellanicus and Humboldt S. humboldti penguins and have similar breeding and feeding ecologies. Adults feed on pelagic schooling fish in continental shelf waters, but African penguins have been reported to have shallower dive angles and remain submerged longer for dives to a given depth than their congeners. The few data for African penguins were gathered using relatively large time-depth recorders. We measured diving behaviour of 36 African penguins provisioning small chicks at three colonies near Cape Town, South Africa. Maximum and mean dive depths were 69m and 14m respectively. Diving took place mainly during the day. Although dive depths differed between colonies, there were no significant differences in dive duration or maximum, median or mean depth. Total dive duration, descent time, bottom time, ascent time and dive angle all were strongly correlated with the maximum depth attained. The diving behaviour of African penguins is similar to that of its congeners. Diving performance probably was compromised by the data-logger used in the previous study. Comparative data from Humboldt penguins also indicate potential biases in an earlier study of this species. Care is needed when comparing the diving performance of penguins measured using different loggers. DA - 2007 DB - OpenUCT DP - University of Cape Town J1 - African Journal of Marine Science KW - African penguin KW - dive angle KW - dive depth KW - dive duration KW - logger impacts KW - Spheniscus LK - https://open.uct.ac.za PB - University of Cape Town PY - 2007 SM - 1814-232X T1 - Diving behaviour of African penguins: do they differ from other Spheniscus penguins? TI - Diving behaviour of African penguins: do they differ from other Spheniscus penguins? UR - http://hdl.handle.net/11427/22529 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/22529
dc.identifier.urihttp://www.tandfonline.com/doi/abs/10.2989/AJMS.2007.29.2.1.184
dc.identifier.vancouvercitationRyan PG, Petersen SL, Simeone A, Grémillet D. Diving behaviour of African penguins: do they differ from other Spheniscus penguins?. African Journal of Marine Science. 2007; http://hdl.handle.net/11427/22529.en_ZA
dc.language.isoeng
dc.publisherNational Inquiry Services Centre
dc.publisher.departmentDepartment of Biological Sciencesen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.sourceAfrican Journal of Marine Science
dc.source.urihttp://www.tandfonline.com/toc/tams20/current
dc.subjectAfrican penguin
dc.subjectdive angle
dc.subjectdive depth
dc.subjectdive duration
dc.subjectlogger impacts
dc.subjectSpheniscus
dc.titleDiving behaviour of African penguins: do they differ from other Spheniscus penguins?
dc.typeJournal Article
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearch
uct.type.resourceArticle
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