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dc.contributor.advisor SAJAR en_ZA Author en_ZA Bester, M.N. Lenglart, P.Y.
dc.coverage.spatial Antarctica en_ZA
dc.coverage.spatial Prince Edward islands 2018-08-23T07:54:40Z 2018-08-23T07:54:40Z 1971 en_ZA 1982 1971 en_ZA 1982
dc.description.abstract abstract en_ZA
dc.description.abstract The spring 1979 breeding population of southern elephant seals Mirounga leonina at Kerguelen (49�'S, 69�' E) numbered 2 993 bulls and 38 181 cows, with 36291 live pups present during the census period. Mean harem structure (beachmasters : assistant beachmasters : challengers : bachelors : cows) was I: 0,43:2,98: 1,54:76, 13�1,55; harem sex ratio and overall sex ratio being 1:53,1 and 1:12,8 respectively. Significant differences in the overall sex ratio, harem structure and frequency distribution exist in comparison with previous surveys, particularly that of 1977. These differences may be related to the difference in the mean census dates of the different years, but were also accompanied by a continued decrease in both the cow and bull components, corroborating the slump noted since 1970. An analysis based on subdivisions of the study area into distinct regions, showed area specific increases and decreases in cow numbers, in spite of the net decrease in cow numbers. The linear regression of area specific percentage pup mortality on the density of cows was highly significant, which could explain the area specific fluctuation in cow numbers, elephant seal cows reputedly showing fidelity to their birthsites. This density dependent mechanism acts primarily through pup mortality as a function of the density of bulls active in and around the harems, bull numbers being positively correlated with cow numbers. en_ZA
dc.description.sponsorship Sponsored by the National Research Foundation (South Africa) en_ZA
dc.description.sponsorship Sponsored by the National Research Foundation (South Africa)
dc.description.statementofresponsibility Antarctic Legacy of South Africa en_ZA
dc.description.statementofresponsibility Antarctic Legacy Project
dc.language en_ZA en_ZA
dc.language en_ZA
dc.publisher South African Journal of Antarctic Research en_ZA
dc.publisher South African Journal of Antarctic Research Vol 12
dc.relation.ispartof Vol 4 en_ZA
dc.rights Copyright en_ZA
dc.rights Copyright
dc.subject Antarctica en_ZA
dc.subject Kerguelen
dc.subject Mammals
dc.subject Southern Elephant Seal
dc.title Title en_ZA
dc.title An analysis of the southern elephant seal Mirounga leonine breeding population at Kerguelen
dc.type Articles en_ZA
dc.type Articles
iso19115.mdconstraints.uselimitation This item and the content of this website are subject to copyright protection. Reproduction of the content, or any part of it, other than for research, academic or non-commercial use is prohibited without prior consent from the copyright holder. en_za PDF en_za
iso19115.mdidentification.deliverypoint Antarctic Legacy of South Africa, Faculty of Science, Stellenbosch University. Private Bag X1, Matieland. Stellenbosch. South Africa. en_za
iso19115.mdidentification.electronicmailaddress en-za

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