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首页> 外文期刊>Polar biology >Cycles of Euphausia superba recruitment evident in the diet of Pygoscelid penguins and net trawls in the South Shetland Islands, Antarctica
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Cycles of Euphausia superba recruitment evident in the diet of Pygoscelid penguins and net trawls in the South Shetland Islands, Antarctica

机译：南极南设得兰群岛的企鹅企鹅和网拖网的饮食中明显表现出南极磷虾的募集周期

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摘要

Size and sex of Antarctic krill taken from chin-strap and gentoo penguin diet were compared to those from scientific net surveys in the South Shetland Islands from 1998 to 2006 in order to evaluate penguin diet as a sampling mechanism and to look at trends in krill populations. Both penguin diet and net samples revealed a 4-5 year cycle in krill recruitment with one or two strong cohorts sustaining the population during each cycle. Penguin diet samples contained adult krill of similar lengths to those caught in nets; however, penguins rarely took juvenile krill. Penguin diet samples contained proportionately more females when the krill population was dominated by large adults at the end of the cycles; net samples showed greater proportions of males in these years. These patterns are comparable to those reported elsewhere in the region and are likely driven by the availability of different sizes and sexes of krill in relation to the colony.
机译：对比了1998年至2006年在南设得兰群岛上从下巴带和gentoo企鹅饮食中提取的南极磷虾的大小和性别，与科学网络调查中的结果进行了比较，以评估企鹅饮食作为一种采样机制并研究了磷虾种群的趋势。企鹅饮食和净样本都显示磷虾招募的周期为4-5年，每个周期有一两个强大的种群维持种群。企鹅饮食样本中的成年磷虾长度与网中捕获的磷虾相似。但是，企鹅很少食用磷虾。当磷虾种群在周期结束时被大型成年人所占优势时，企鹅饮食样本中的雌性成比例增加。净样本显示这些年来男性比例更高。这些模式可与该地区其他地区报道的模式相媲美，并且可能是由于与该殖民地有关的磷虾的大小和性别不同而引起的。

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