...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Marine biology >Evaluating the relative importance of intrinsic and extrinsic factors on the foraging activity of top predators: a case study on female little penguins
【24h】

Evaluating the relative importance of intrinsic and extrinsic factors on the foraging activity of top predators: a case study on female little penguins

机译：评价内在和外在因素对顶级捕食者觅食活动的相对重要性：以雌性小企鹅为例的研究

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A complex interaction of biotic and abiotic factors influences animal foraging activity. It is often difficult to understand which factors may affect animals' foraging and how it is affected. For instance, whereas the effect of sexual dimorphism on foraging activity has been reported in several species, little is known of the complex interactions between variables acting at a finer scale, e.g. the variability of body mass within a sex. Evaluating the importance of these finer scale factors is also essential to the understanding of foraging behaviour. We propose here a simple approach by applying principal component analysis (PCA) in a novel way to examine relationships between biotic and abiotic factors affecting foraging behaviour of top predators. We studied female little penguins (Eudyptula minor) of known age, carrying miniature accelerometers during the guard stage of breeding. Surprisingly, the body mass of the females did not influence any of the foraging parameters, but females foraging later in the breeding season dived shallower and more often, showing a strong correlation with laying date. Similarly, the diving effort of females was greater with increasing chick age within the same breeding stage. These results indicate that for female little penguin, the relationship between changes in prey availability and hunting effort can change at a fine scale, within a breeding stage. Therefore, any analysis of little penguin foraging behaviour during breeding should consider the timing in relation to the breeding season. We encourage researchers to develop the use of this PCA approach as it could help clarify the complexity of the underlying mechanisms determining foraging activity and we propose that it should be used as a first step of foraging behaviour analysis, before examining a particular relationship.
机译：生物和非生物因素之间复杂的相互作用会影响动物的觅食活动。通常很难理解哪些因素会影响动物的觅食及其影响。例如，虽然在一些物种中已经报道了性二态性对觅食活动的影响，但是对于以较小尺度起作用的变量之间的复杂相互作用，例如，在人类中，鲜为人知。性别在体内的变异性。评估这些更小尺度因素的重要性对于理解觅食行为也至关重要。我们在这里提出一种简单的方法，以新颖的方式应用主成分分析（PCA）来检查影响顶级捕食者觅食行为的生物和非生物因素之间的关系。我们研究了已知年龄的雌性小企鹅（Eudyptula minor），在繁殖的保护阶段携带微型加速度计。出人意料的是，雌性的体重没有影响任何觅食参数，但在繁殖季节后期觅食的雌性则潜入更浅且更频繁，这与产蛋日期密切相关。同样，在相同的繁殖阶段，随着雏鸡年龄的增加，雌性的潜水努力也更大。这些结果表明，对于雌性小企鹅，在繁殖阶段，猎物可利用性的变化与狩猎努力之间的关系可以在很小的范围内变化。因此，任何对繁殖过程中企鹅觅食行为的分析都应考虑与繁殖季节有关的时间。我们鼓励研究人员开发这种PCA方法，因为它可以帮助澄清决定觅食活动的潜在机制的复杂性，我们建议在检查特定关系之前，应将其用作觅食行为分析的第一步。

著录项

  • 来源
    《Marine biology》 |2011年第4期|p.715-722|共8页
  • 作者

    I. Zimmer; Y. Ropert-Coudert; N. Poulin; A. Kato; A. Chiaradia;

  • 作者单位

    Universite de Strasbourg, IPHC, 23 rue Becquerel, 67087 strasbourg, France CNRS, UMR7178, 67037 Strasbourg, France;

    Universite de Strasbourg, IPHC, 23 rue Becquerel, 67087 strasbourg, France CNRS, UMR7178, 67037 Strasbourg, France;

    Universite de Strasbourg, IPHC, 23 rue Becquerel, 67087 strasbourg, France CNRS, UMR7178, 67037 Strasbourg, France;

    National Institute of Polar Research, 10-3, Midoricho,Tachikawa, Tokyo 190-8518, Japan;

    Research Department, Phillip Island Nature Park,P.O. Box 97, Cowes, VIC 3922, Australia;

  • 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
  • 专利
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