False killer whales (Pseudorca crassidens) from Japan and South Africa : differences in growth and reproduction

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dc.contributor.author Ferreira, Ines Maria
dc.contributor.author Kasuya, Toshio
dc.contributor.author Marsh, Helene
dc.contributor.author Best, Peter B.
dc.date.accessioned 2015-11-13T07:20:44Z
dc.date.available 2015-11-13T07:20:44Z
dc.date.issued 2014-01
dc.description.abstract Age and reproductive information for 65 false killer whales stranded in South Africa in 1981 are compared with similar material from 156 animals examined from drive fisheries in Japan in 1979 and 1980. Sizes at birth, sexual maturation, and physical maturity all indicated that both sexes were 10%–20% larger in Japan than South Africa. Females reached sexual maturation at similar ages (8–10.5 yr) in both populations, and although sample sizes were too small to establish male ages at puberty precisely the ranges in Japan (10.5–18.5 yr) and South Africa (5.25–17.5 yr) were not inconsistent. The initial ovulation rate for females from South Africa was 65% lower (and the apparent pregnancy rate 82% lower) than those from Japan and there were fewer animals 2 yr old within the school, but the magnitude of these differences suggests that the stranded school’s reproductive performance was probably impaired. Collectively these comparisons and the literature indicate substantive size differences between false killer whales in different populations, although the patterns of growth appear similar. Firm conclusions about any geographical differences in reproduction require additional data. en_ZA
dc.description.librarian hb2015 en_ZA
dc.description.sponsorship World Wide Fund for Nature, Japan. National Research Foundation, South Africa. . en_ZA
dc.description.uri http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1748-7692 en_ZA
dc.identifier.citation Ferreira, IM, Kasuya, T, Marsh, H & Best, PB 2014, 'False killer whales (Pseudorca crassidens) from Japan and South Africa : differences in growth and reproduction', Marine Mammal Science, vol. 30, no. 1, pp. 64-84. en_ZA
dc.identifier.issn 0824-0469 (print)
dc.identifier.issn 1748-7692 (online)
dc.identifier.other 10.1111/mms.12021
dc.identifier.uri http://hdl.handle.net/2263/50452
dc.language.iso en en_ZA
dc.publisher Wiley en_ZA
dc.rights © 2013 by the Society for Marine Mammalogy. This is the pre-peer reviewed version of the following article : False killer whales (Pseudorca crassidens) from Japan and South Africa : differences in growth and reproduction, Marine Mammal Science, vol. 30, no.1, pp. 64-84, 2014. doi : 10.1111/mms.12021. The definite version is available at : http://onlinelibrary.wiley.comjournal/10.1111/(ISSN)1748-7692. en_ZA
dc.subject Age en_ZA
dc.subject Growth en_ZA
dc.subject Reproduction en_ZA
dc.subject North Pacific en_ZA
dc.subject South Atlantic en_ZA
dc.subject False killer whales (Pseudorca crassidens) en_ZA
dc.title False killer whales (Pseudorca crassidens) from Japan and South Africa : differences in growth and reproduction en_ZA
dc.type Postprint Article en_ZA


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