False killer whales (Pseudorca crassidens) from Japan and South Africa: Differences in growth and reproduction
False killer whales (Pseudorca crassidens) from Japan and South Africa: Differences in growth and reproduction
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DOI：
10.1111/mms.12021
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发表时间：
2014-01-01
影响因子：
2.3
通讯作者：
Best, Peter B.
中科院分区：
文献类型：
--
作者：
Ferreira, Ines M.;Kasuya, Toshio;Best, Peter B.
将 1981 年在南非搁浅的 65 头假虎鲸的年龄和繁殖信息与 1979 年和 1980 年日本驱渔场检查的 156 头虎鲸的类似材料进行了比较。出生时的体型、性成熟和身体成熟度都表明，日本的两性都比南非大 10%-20%。两个人群中女性达到性成熟的年龄相似（8-10.5岁），尽管样本量太小，无法准确确定男性青春期的年龄，但日本（10.5-18.5岁）和南非（5.25-17.5岁）的范围并不不一致。南非雌性的初始排卵率比日本雌性低 65%（表观妊娠率低 82%），而且学校内 2 岁的动物也较少，但这些差异的严重程度表明，滞留学校的繁殖性能可能受到损害。总的来说，这些比较和文献表明，尽管生长模式相似，但不同种群的假虎鲸之间存在巨大的体型差异。关于生殖中任何地理差异的确切结论需要额外的数据。
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 (8-10.5yr) in both populations, and although sample sizes were too small to establish male ages at puberty precisely the ranges in Japan (10.5-18.5yr) and South Africa (5.25-17.5yr) 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 2yr 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.