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

 

Show simple item record

dc.contributor.author Ryan, P G
dc.contributor.author Petersen, S L
dc.contributor.author Simeone, A
dc.contributor.author Grémillet, D
dc.date.accessioned 2016-11-14T11:06:18Z
dc.date.available 2016-11-14T11:06:18Z
dc.date.issued 2007
dc.identifier http://dx.doi.org/10.2989/AJMS.2007.29.2.1.184
dc.identifier.citation Ryan, 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.issn 1814-232X
dc.identifier.uri http://hdl.handle.net/11427/22529
dc.identifier.uri http://www.tandfonline.com/doi/abs/10.2989/AJMS.2007.29.2.1.184
dc.description.abstract 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.
dc.publisher National Inquiry Services Centre
dc.source African Journal of Marine Science
dc.source.uri http://www.tandfonline.com/toc/tams20/current
dc.subject African penguin
dc.subject dive angle
dc.subject dive depth
dc.subject dive duration
dc.subject logger impacts
dc.subject Spheniscus
dc.title Diving behaviour of African penguins: do they differ from other Spheniscus penguins?
dc.type Journal Article
dc.date.updated 2016-01-22T09:42:31Z
uct.type.publication Research
uct.type.resource Article
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Science en_ZA
dc.publisher.department Department of Biological Sciences 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