...
首页> 外文期刊>Marine biology >Shift in foraging grounds and diet broadening during ontogeny in southern elephant seals from Kerguelen Islands
【24h】

Shift in foraging grounds and diet broadening during ontogeny in southern elephant seals from Kerguelen Islands

机译:克格伦群岛南部象海豹在个体发育过程中觅食地的变化和饮食拓宽

获取原文
获取原文并翻译 | 示例
           

摘要

Highly dimorphic species like southern elephant seals (Mirounga leonina, SES hereafter) frequently exhibit resource partitioning according to sex and/or age classes. We measured carbon and nitrogen stable isotopes (δ~(13)C and δ~(15)N) of 404 blood samples (136 males and 268 females from Kerguelen Islands, 49°21'S, 70°18'E) from 2004 to 2011. Assuming that the distribution of carbon isotopes (δ~(13)C value) reflects the two main foraging grounds (Polar Frontal and Antarctic Zones), we quantified the proportion of SES foraging within each zone in relation with size, a proxy for their age. We found a clear shift from Polar Frontal to Antarctic waters as male SES aged, but no relation as far as females is concerned. We also observed a widening range of nitrogen isotopic (δ~(15)N) values, suggesting that both males and females expanded their diet spectra with age. Whereas males increased their trophic level, females remained constant on average, with some adult females feeding both at lower and at higher trophic levels than juveniles.
机译:像南部象海豹(Mirounga leonina,以下简称SES)这样的高度双态物种经常会根据性别和/或年龄类别进行资源分配。我们测量了2004年至2011年404份血液样本(克尔格伦群岛的136位男性和268位女性,南纬49°21',南纬70'18')的碳和氮稳定同位素(δ〜(13)C和δ〜(15)N) 。假设碳同位素的分布(δ〜(13)C值)反映了两个主要觅食地(极额带和南极带),我们量化了每个带内SES觅食的比例与大小的关系,作为它们的代用量年龄。我们发现,随着雄性SES年龄的增长,从极额水域向南极水域有了明显的转变,但就雌性而言却没有任何关系。我们还观察到了氮同位素(δ〜(15)N)值的扩大范围,这表明雄性和雌性的饮食谱都随着年龄的增长而扩大。男性的营养水平提高了,而女性的平均营养水平却保持不变,一些成年女性的营养水平低于少年。

著录项

  • 来源
    《Marine biology》 |2013年第4期|977-986|共10页
  • 作者单位

    Centre d'Etude Biologique de Chize, CNRS UPR 1934,79360 Villiers-en-Bois, France;

    Centre d'Etude Biologique de Chize, CNRS UPR 1934,79360 Villiers-en-Bois, France;

    Littoral Environnement et Societes, UMR 6250 du CNRS-Universite de la Rochelle, La Rochelle, France;

    Centre d'Etude Biologique de Chize, CNRS UPR 1934,79360 Villiers-en-Bois, France;

    Centre d'Etude Biologique de Chize, CNRS UPR 1934,79360 Villiers-en-Bois, France;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号