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Sex-related differences in feeding behaviour and implications for differential migration in Western Sandpipers (Calidris mauri).

机译:西部矶pi(Calidris mauri)的进食行为与性别有关的差异以及差异迁徙的影响。

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摘要

I examined relationships between bill morphology, feeding behaviour and non-breeding distribution in a sexually dimorphic shorebird, the Western Sandpiper (Calidris mauri). The sexes are differentially distributed across the non-breeding range, with males, the shorter-billed sex, shifted north relative to females. Males are more reliant on pecking (surface feeding) during both migration and the non-breeding period while females do more probing (subsurface feeding). I tested whether differences in feeding mode result in sex-related differences in diet. Results of surficial food removal plots and stable isotope analyses were equivocal. I also tested the hypothesis that latitudinal gradients in the vertical distribution of food (invertebrates and biofilm) underlie differential migration in Western Sandpipers. Surface food predominated at northern sites, while subsurface food predominated at southern sites. This study is the first to relate latitudinal scale changes in the distribution of food to functional morphology and differential non-breeding distribution in a shorebird.
机译:我检查了性双态水鸟西部Sand(Calidris mauri)的票据形态,进食行为和非繁殖分布之间的关系。性别在非繁殖范围内的分布差异很大,雄性(短嘴鸟性)相对于雌性向北移动。雄性在迁徙期和非繁殖期都更加依赖啄食(表面喂养),而雌性则更多地进行探测(地下喂养)。我测试了进食方式的差异是否导致饮食方面的性别相关差异。表面食物清除图和稳定同位素分析的结果是模棱两可的。我还检验了一种假设,即食物(无脊椎动物和生物膜)的垂直分布中的纬度梯度是西部Sand的差异迁移的基础。北部地区以表层食物为主,南部地区以地下食物为主。这项研究是第一个将食物分布的纬度尺度变化与水鸟的功能形态和微分非繁殖分布联系起来的研究。

著录项

  • 作者

    Mathot, Kimberley J.;

  • 作者单位

    Simon Fraser University (Canada).;

  • 授予单位 Simon Fraser University (Canada).;
  • 学科 Biology Ecology.
  • 学位 M.Sc.
  • 年度 2005
  • 页码 102 p.
  • 总页数 102
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 生态学(生物生态学);
  • 关键词

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