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首页> 外文期刊>Polar biology >Introduced black rats Rattus rattus on He de la Possession (lies Crozet, Subantarctic): diet and trophic position in food webs
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Introduced black rats Rattus rattus on He de la Possession (lies Crozet, Subantarctic): diet and trophic position in food webs

机译：引进黑老鼠鼠（Hetus la Possession）（褐猪科罗兹，亚南极）：食物网中的饮食和营养位置

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摘要

Rats introduced on islands can affect ecosystem structure and function by feeding on terrestrial plants and both marine and terrestrial animals. The diet and trophic position of Rattus rattus introduced on He de la Possession (lies Crozet) was assessed from two sites, according to the presence or absence of a king penguin colony. We used three complementary assays: macroanalyses of the stomach, faecal microhistology, and stable isotope analyses of δ~(15)N/δ~(13)C in liver. Near the rookery, spermatophytes contributed on average 50% (confidential interval: 23-75) to the diet based on isotopes, mainly consisting in reproductive parts of Poa spp., Agrostis magellanica, and Cerastium fontanum identified in faeces. Terrestrial animal preys were represented by insects that contributed 25% (0-56) in isotopes, dominated in faeces by caterpillars of Pringleophaga spp. and adult weevils. Bird remains were found in faeces, forming 18% (6-30) of isotopes. Terrestrial earthworms contributed to 7% (0-21), with chaetae observed in faeces. On the other site, spermatophytes represented 62% (51-73) of assimilated food in rats' livers, mainly formed by Poaceae and Acaena magellanica, insects by caterpillars [24% (10-39)], and terrestrial earthworms [13% (2-23)]. Our results suggest that rats, which were found at the top of terrestrial food chains, may have a direct role on a such simplified ecosystem, by preying on the most abundant and largest body-sized terrestrial invertebrates,-e.g. the keystone species Pringleophaga spp.-, and by feeding on both reproductive and vegetative parts of autochthonous and introduced plants. The discrepancies and usefulness of employing both isotopes and faecal analyses are discussed.
机译：引入岛屿的老鼠可以通过以陆生植物以及海洋和陆生动物为食，从而影响生态系统的结构和功能。根据有无企鹅国王殖民地，从两个地点评估了He de la Possession（隶属Crozet）上引入的褐家鼠的饮食和营养状况。我们使用了三种互补的检测方法：胃的宏观分析，粪便的显微组织学以及肝脏中δ〜（15）N /δ〜（13）C的稳定同位素分析。在种群附近，基于同位素的饮食中，精子植物平均占饮食的50％（机密区间：23-75），主要由粪便中发现的Poa spp。，Agrostis magellanica和Cerastium fontanum的生殖部分组成。陆生动物的猎物以昆虫为代表，这些昆虫在同位素中的贡献率为25％（0-56），在粪便中以Pringleophaga spp的毛虫为主。和成年象鼻虫。在粪便中发现鸟类残骸，形成18％（6-30）的同位素。陆地earth占7％（0-21），粪便中可见cha毛。在另一处，精子植物占大鼠肝脏同化食物的62％（51-73），主要由禾本科和东方金合欢（Acaena magellanica），毛毛虫（24％（10-39））和陆生[（13％（ 2-23）]。我们的研究结果表明，发现在陆地食物链顶部的老鼠可能会捕食最丰富和最大的体形无脊椎动物，例如在如此简单的生态系统中发挥直接作用。的主要物种是Pringleophaga spp.-，并以本地和引进植物的生殖和营养部分为食。讨论了同时使用同位素和粪便分析的差异和实用性。

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  • 来源
    《Polar biology》 |2011年第2期|p.169-180|共12页
  • 作者

    Benoit Pisanu; Stephane Caut; Sylvain Gutjahr; Philippe Vernon; Jean-Louis Chapuis;

  • 作者单位

    Departement Ecologie et Gestion de la Biodiversite, Museum National d'Histoire Naturelle, UMR 7204 CERSP, 61 rue Buffon, CP 53, 75231 Paris cedex 05, France;

    rnEstacion Biologica de Dofiana, Consejo Superior de Investigationes Cientificas (CSIC), Apdo. 1056, E-41080 Sevilla, Spain;

    rnDepartement Ecologie et Gestion de la Biodiversite, Museum National d'Histoire Naturelle, UMR 7204 CERSP, 61 rue Buffon, CP 53, 75231 Paris cedex 05, France,Universite de Rennes I, UMR 6553 CNRS ECOBIO, Station Biologique de Paimpont, 35380 Paimpont, France;

    rnUniversite de Rennes I, UMR 6553 CNRS ECOBIO, Station Biologique de Paimpont, 35380 Paimpont, France;

    rnDepartement Ecologie et Gestion de la Biodiversite, Museum National d'Histoire Naturelle, UMR 7204 CERSP, 61 rue Buffon, CP 53, 75231 Paris cedex 05, France;

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  • 正文语种 eng
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  • 关键词

    introduced rodent; rattus rattus; diet; stable isotopes; food web; Subantarctic Island;

    机译：引入啮齿动物rat饮食;稳定同位素食物网;亚南极岛;

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