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AGE-RELATED DIFFERENCES IN FORAGING ABILITY AMONG CLAMDROPPING HERRING GULLS (LARUS ARGENTATUS)

机译:整枝鲱鸥(LARUS ARGENTATUS)在觅食能力方面的年龄差异

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摘要

Juvenile birds are generally less efficient foragers than adults, and this can lead to reduced survival or delayed reproduction. Feeding on hard-shelled nuts and mollusks after breaking them open by dropping is particularly challenging. To determine whether juvenile birds are as proficient as adults at this complex foraging task, we compared juvenile and adult Herring Gulls (Larus argentatus) feeding at low tide by dropping clams (Rangia cuneata) at a coastal estuary in Virginia, USA. Juvenile (first-winter) gulls were less successful than adult (2+ years old) birds at finding clams to drop. Moreover, the clams they selected were of a wider range of sizes, more often being difficult to handle or of lower nutritional value. Juveniles did, however, drop clams with the same degree of success as adult birds. Together these results suggest that learning to find and recognize profitable clams is the developmental bottleneck in this complex behavior.
机译:幼鸟通常不像成年鸟那样高效觅食,这可能导致成活率降低或繁殖延迟。通过掉落将硬壳坚果和软体动物打开后,喂食它们尤其具有挑战性。为了确定在这种复杂的觅食任务中幼鸟是否能像成年鸟一样熟练,我们比较了在低潮时通过在美国弗吉尼亚州的一个沿海河口放下蛤((Rangia cuneata)喂食的幼年和成年鲱鸥(Larus argentatus)。幼年(初冬)海鸥发现成年蛤的成功率不及成年(2岁以上)海鸥。而且,他们选择的蛤of的大小范围更广,通常更难处理或营养价值较低。然而,幼鸟的蛤drop成功率与成年鸟一样。这些结果共同表明,学会寻找和识别可获利的蛤is是这种复杂行为的发展瓶颈。

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  • 来源
    《The wilson journal of ornithology》 |2017年第2期|301-310|共10页
  • 作者单位

    Institute for Integrative Bird Behavior Studies, Department of Biology, College of William and Mary, P.O. Box 8795, Williamsburg, VA 23187, USA;

    Institute for Integrative Bird Behavior Studies, Department of Biology, College of William and Mary, P.O. Box 8795, Williamsburg, VA 23187, USA,Current address: The Scientist, LabX Media Group, P.O. Box 216, 478 Bay Street, Midland, ON, Canada;

    Institute for Integrative Bird Behavior Studies, Department of Biology, College of William and Mary, P.O. Box 8795, Williamsburg, VA 23187, USA,Current address: Brick Township High School, 346 Chambers Bridge Road, Brick, NJ 08723, USA;

    Institute for Integrative Bird Behavior Studies, Department of Biology, College of William and Mary, P.O. Box 8795, Williamsburg, VA 23187, USA,Current address: City of San Jose, Environmental Services Department, 700 Los Esteros Road, San Jose, CA 95134, USA;

    Institute for Integrative Bird Behavior Studies, Department of Biology, College of William and Mary, P.O. Box 8795, Williamsburg, VA 23187, USA,Current address: Briar Bush Nature Center, 1212 Edgehill Road, Abington, PA 19001, USA;

    Institute for Integrative Bird Behavior Studies, Department of Biology, College of William and Mary, P.O. Box 8795, Williamsburg, VA 23187, USA,Current address: Division of Business, Mathematics and Sciences, Columbia College, Columbia, SC 29203, USA;

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

    age-related foraging; development; foraging skill; Herring Gull; Larus argentatus; prey dropping;

    机译:与年龄有关的觅食;发展觅食技巧鲱鸥;鸥猎物掉落;

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