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首页> 外文期刊>Marine biology >Inter-annual changes in diet and foraging trip lengths in a small pelagic seabird, the thin-billed prion Pachyptila belcheri
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Inter-annual changes in diet and foraging trip lengths in a small pelagic seabird, the thin-billed prion Pachyptila belcheri

机译：小型中上层海鸟，薄嘴病毒Pachyptila belcheri的饮食和觅食行程长度的年际变化

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摘要

Central place foragers are constrained in their foraging distribution by the necessity to return to their nest site at regular intervals. In many petrels that feed on patchily distributed prey from the sea surface over large foraging areas, alternating long and short foraging trips are used to balance the demands of the chick with the requirements of maintaining adult body condition. When the local conditions are favourable for prey density and quality, adults should be able to reduce the number of long foraging trips. We studied the flexibility in foraging trip lengths of a small pelagic petrel, the thin-billed prion Pachyptila belcheri, over three breeding seasons with increasingly favourable, cold-water conditions. During a warm-water influx in February 2006, chicks were fed less frequently and adults carried out foraging trips of up to 8 days. When conditions became more favourable with colder water temperatures in 2007 and 2008, thin-billed prions decreased trip lengths, more often attended their chick every day, and long foraging trips of six to eight daysrnwere not registered during 2008. Chick growth rates mirrored this, as chicks grew poorly during 2006, intermediate during 2007 and best during 2008. Thin-billed prions preyed mainly on squid during incubation and mainly on amphipods and euphausiids during chick-rearing. In the poorest season only, the diet was substantially supplemented with very small copepods. Together, the present results indicate that during warm-water conditions, thin-billed prions had difficulties in finding sufficient squid, amphipods or euphausiids and were forced to switch to lower trophic level prey, which they had to search for over large ocean areas.
机译：中心地点的觅食者因必须定期返回其巢穴而限制了觅食的分布。在许多海燕中，它们以较大的觅食区域为食，从海面零星分布地觅食，长短交替的觅食行程被用来平衡雏鸡的需求和维持成年体况的需求。当当地条件有利于猎物的密度和质量时，成年成年人应能够减少长时间觅食的次数。我们研究了在三个有利繁殖的冷水条件下的三个繁殖季节中，小型浮游海燕，薄嘴病毒Pachyptila belcheri觅食行程的灵活性。在2006年2月的温水潮中，雏鸡的饲喂频率降低了，成虫进行了长达8天的觅食旅行。当2007年和2008年的水温较低，情况变得更加有利时，薄嘴病毒减少了出行时间，每天都有更多的时间出雏，并且在2008年没有进行六到八天的长时间觅食。因为在2006年，小鸡生长缓慢，在2007年到中期，在2008年是最佳。小嘴病毒在孵化过程中主要捕食鱿鱼，而在饲养过程中主要捕食两栖类和虾类。仅在最贫穷的季节，饮食中才添加了非常小的co足类动物。总之，目前的结果表明，在温暖的水域条件下，细嘴病毒很难找到足够的鱿鱼，两栖类动物或虾类，并且被迫转为低营养级别的猎物，他们不得不在广阔的海洋区域中进行搜索。

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  • 来源
    《Marine biology》 |2010年第9期|P.2043-2050|共8页
  • 作者

    Petra Quillfeldt; Andreas Michalik; Gritta Veit-Koehler; Ian J. Strange; Juan F. Masello;

  • 作者单位

    Max-Planck-Institut fuer Ornnithologie, Vogelwarte Radolfzell,Radolfzell, Germany;

    rnMax-Planck-Institut fuer Ornnithologie, Vogelwarte Radolfzell,Radolfzell, Germany Department of Biology/Chemistry, Experimental Ecology Group, University of Osnabrueck, Osnabrueck, Germany;

    rnDeutsches Zentrum fuer Marine Biodiversitaetsforschung,Forschungsinstitut Senckenberg, Wilhelmshaven, Germany;

    rnNew Island Conservation Trust, Stanley, Falkland Islands;

    rnMax-Planck-Institut fuer Ornnithologie, Vogelwarte Radolfzell,Radolfzell, Germany;

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