Breeding Jackass Penguins as pelagic predators

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dc.contributor.advisorSiegfried, Royen_ZA
dc.contributor.authorWilson, Rory Paulen_ZA
dc.date.accessioned2016-03-11T14:25:46Z
dc.date.available2016-03-11T14:25:46Z
dc.date.issued1986en_ZA
dc.descriptionBibliography: pages 187-191.en_ZA
dc.description.abstractThe foraging of breeding Jackass Penguins Spheniscus demersus was studied in and around southwestern Cape Province, Saldanha Bay (33⁰ S, 18⁰ E), South Africa. Penguins are difficult to observe at sea. Hence, I devised a number of new techniques for studying the foraging behaviour of Jackass Penguins at sea. I built electronic and autoradiographic remote-sensing devices to measure swimming speed, distance travelled and time spent at each depth by foraging Jackass Penguins. Penguin swimming speed was reduced in proportion to the cross-sectional area of the devices, and results derived from birds wearing the devices had to be interpreted accordingly. Penguins do not regurgitate their stomach contents when handled, so I constructed a wet-offloading stomach pump which extracted 100% of the stomach contents. Using this pump, I determined that the rate of digestion of fish and squid by Jackass Penguins differed. Care is needed in diet interpretations where both fish and squid are major food items.en_ZA
dc.identifier.apacitationWilson, R. P. (1986). <i>Breeding Jackass Penguins as pelagic predators</i>. (Thesis). University of Cape Town ,Faculty of Science ,Percy FitzPatrick Institute of African Ornithology. Retrieved from http://hdl.handle.net/11427/17653en_ZA
dc.identifier.chicagocitationWilson, Rory Paul. <i>"Breeding Jackass Penguins as pelagic predators."</i> Thesis., University of Cape Town ,Faculty of Science ,Percy FitzPatrick Institute of African Ornithology, 1986. http://hdl.handle.net/11427/17653en_ZA
dc.identifier.citationWilson, R. 1986. Breeding Jackass Penguins as pelagic predators. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Wilson, Rory Paul AB - The foraging of breeding Jackass Penguins Spheniscus demersus was studied in and around southwestern Cape Province, Saldanha Bay (33⁰ S, 18⁰ E), South Africa. Penguins are difficult to observe at sea. Hence, I devised a number of new techniques for studying the foraging behaviour of Jackass Penguins at sea. I built electronic and autoradiographic remote-sensing devices to measure swimming speed, distance travelled and time spent at each depth by foraging Jackass Penguins. Penguin swimming speed was reduced in proportion to the cross-sectional area of the devices, and results derived from birds wearing the devices had to be interpreted accordingly. Penguins do not regurgitate their stomach contents when handled, so I constructed a wet-offloading stomach pump which extracted 100% of the stomach contents. Using this pump, I determined that the rate of digestion of fish and squid by Jackass Penguins differed. Care is needed in diet interpretations where both fish and squid are major food items. DA - 1986 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1986 T1 - Breeding Jackass Penguins as pelagic predators TI - Breeding Jackass Penguins as pelagic predators UR - http://hdl.handle.net/11427/17653 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/17653
dc.identifier.vancouvercitationWilson RP. Breeding Jackass Penguins as pelagic predators. [Thesis]. University of Cape Town ,Faculty of Science ,Percy FitzPatrick Institute of African Ornithology, 1986 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/17653en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentPercy FitzPatrick Institute of African Ornithologyen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherOrnithologyen_ZA
dc.subject.otherZoologyen_ZA
dc.subject.otherPredatory animalsen_ZA
dc.subject.otherJackass penguinen_ZA
dc.titleBreeding Jackass Penguins as pelagic predatorsen_ZA
dc.typeDoctoral Thesis
dc.type.qualificationlevelDoctoral
dc.type.qualificationnamePhDen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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