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首页> 外文期刊>Polar biology >Inter-sexual differences in Antarctic fur seal pup growth rates: evidence of environmental regulation?
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Inter-sexual differences in Antarctic fur seal pup growth rates: evidence of environmental regulation?

机译：两性之间的南极海狗幼崽生长率差异：环境调节的证据？

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We investigated the variation of Antarctic fur seal (Arctocephalus gazella) pup growth rates in response to sex, breeding season and duration of both maternal foraging trip and attendance bouts. Data were collected during five consecutive rearing seasons at Cape Shirreff, the most important breeding colony in the South Shetland Islands, Antarctica. Our results showed significant interannual and sexual variations in pup growth rates. Male pups grew significantly faster than female pups during 2000, 2001, 2002 and 2004 seasons, whilst during 2003 no difference was found. The interannual variation in pup growth rates was correlated with the interannual fluctuation in maternal foraging trip and attendance bouts. There was a significant effect of pup sex and maternal foraging trip duration on pup growth rates, which varied between years having foraging trip duration a major effect during 2003, when females spent more time at sea and interestingly on that year there were no sexual differences in pup growth rates. The effect of attendance bout onrnpup growth rates was not significant. Diet analysis showed that Antarctic krill (Euphausia superba) was the most frequent prey item during the study period. Analysis of krill size distribution showed a significant difference in krill length, during 2003, when A. gazella preyed upon the smallest sizes of krill. In this study, sex was the most important factor on pup growth rates, but when prey availability seemed more limited, there are longer foraging trips and shorter attendance bouts the sex factor became less significant.
机译：我们调查了南极海狗（Arctocephalus gazella）幼崽生长速率随性别，繁殖季节以及母体觅食旅行和出勤时间的变化而变化的情况。在南极南设得兰群岛最重要的繁殖地希勒夫角连续五个饲养季节收集了数据。我们的研究结果表明，幼仔的年增长率和性别存在显着差异。 2000年，2001年，2002年和2004年，雄性幼崽的生长速度明显快于雌性幼崽，而2003年没有发现差异。幼仔生长率的年际变化与产妇觅食旅行和出勤率的年际波动相关。幼崽的性行为和产妇的觅食行程持续时间对幼仔的生长速度有显着影响，2003年期间，觅食行程的持续时间长短不一，这是主要的影响。2003年，雌性在海上停留的时间更长，有趣的是，当年的雌性没有幼仔增长率。出勤回合对rnpup增长率的影响不显着。饮食分析表明，南极磷虾（Euphausia superba）是研究期间最常见的猎物。磷虾尺寸分布的分析显示，在2003年，瞪羚捕食最小尺寸的磷虾时，磷虾长度存在显着差异。在这项研究中，性是影响幼仔生长率的最重要因素，但是当猎物的供应似乎更加有限时，觅食行程就越长，出勤率越短，性别因素就变得不那么重要了。

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