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首页> 外文期刊>Marine biology >Isotopic evidence for intersexual foraging variation in northern elephant seals from Baja California, Mexico
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Isotopic evidence for intersexual foraging variation in northern elephant seals from Baja California, Mexico

机译：墨西哥下加利福尼亚州北部象海豹中性觅食变化的同位素证据

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Intersexual foraging variation is a strategy that is usually adopted by sexually dimorphic species. The northern elephant seal (Mirounga angustirostris) exhibits one of the most pronounced examples of sexual dimorphism in pinnipeds and segregation in this species' migration toward foraging grounds in the North Pacific is welldocumented for colonies in California; however, we lack comparable data from colonies in Mexico. The aim of this study was to use stable isotope analysis (d13C and d15N) to evaluate diet variation between adult males and females from a Mexican colony. Fur was collected from adult males (N = 15) and pups (N = 42) on the San Benito Archipelago during the 2012 molting season (summer) and the 2013 breeding season (winter). Values for adult females were inferred from their pups, based on previous studies. The resulting d13C and d15N values were significantly lower than those of their male counterparts. This difference may be due to the higher trophic position and a probable consumption of benthic prey (delta N-15) by males, and the use of mostly oceanic habitats (delta C-13) by adult females; the latter also had a larger isotopic niche than that of the former, as a probable consequence of more variable foraging grounds. Although our results are not the reflection of a simultaneous segregation, we obtained solid evidence on intersexual variation, which is common among dimorphic pinnipeds, particularly in terms of trophic position and habitat use, which tend to be the result of a marked difference in body mass and different energetic requirements.
机译：两性觅食变异是一种有性双态物种通常采用的策略。北部象海豹（Mirounga angustirostris）在pin中表现出性二态性的最明显例子之一，该物种向北太平洋觅食地的迁移中的隔离现象在加利福尼亚已有充分的文献记载。但是，我们缺乏墨西哥殖民地的可比数据。这项研究的目的是使用稳定同位素分析（d13C和d15N）来评估墨西哥殖民地成年男性和女性之间的饮食差异。在2012年蜕皮季节（夏季）和2013年繁殖季节（冬季）从圣贝尼托群岛的成年雄性（N = 15）和幼崽（N = 42）收集毛皮。根据以前的研究，从成年幼崽中推断出成年雌性的价值。所得的d13C和d15N值明显低于男性。造成这种差异的原因可能是男性的营养位置较高，男性可能食用底栖猎物（N-15三角洲），成年女性使用了大部分海洋栖息地（C-13三角洲）；后者的同位素生态位也比前者更大，这可能是由于觅食地多变造成的。尽管我们的结果并非同时隔离的结果，但我们获得了关于两性变异的确凿证据，这在双态pin中常见，特别是在营养位置和栖息地使用方面，这往往是体重差异显着的结果和不同的精力需求。

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    《Marine biology》 |2017年第8期|168.1-168.8|共8页
  • 作者

    Velazquez-Castillo Miriam A.; Elorriaga-Verplancken Fernando R.;

  • 作者单位

    UAQ, Fac Ciencias Nat, Ave Ciencias S-N, Juriquilla 76230, Queretaro, Mexico;

    Inst Politecn Nacl CICIMAR IPN, Ctr Interdisciplinario Ciencias Marinas, Dept Pesquerias & Biol Marina, Ave IPN S-N, Playa Palo De Santa Rita 23096, La Paz, Mexico;

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