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首页> 外文期刊>Marine ecology progress series >Ontogenetic changes in feeding habits of northern elephant seals revealed by δ~(15)N and δ~(13)C analysis of growth layers in teeth
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Ontogenetic changes in feeding habits of northern elephant seals revealed by δ~(15)N and δ~(13)C analysis of growth layers in teeth

机译：通过牙齿生长层的δ〜（15）N和δ〜（13）C分析揭示北象海豹食性的个体发育变化

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摘要

Stable isotope analysis is useful for examining the feeding strategies of mammals. Isotopes in the annual deposition growth layers of dentine in teeth permit assessment of ontogenetic dietary shifts in individuals, because this metabolically inert tissue is not resorbed after deposition. Profiles of stable isotope ratios of nitrogen (δ~(15)N) and carbon (δ~(13)C) from the teeth of northern elephant seals Mirounga angustirostris, aged between 1 and 11 yr, were described from stranded individuals in San Benito and Magdalena Islands, Mexico, between 2000 and 2009. δ~(13)C and δ~(15)N values differed with age in each sex indicating shifts in feeding habits throughout life, as well as in their physiological condition. Although steady δ~(13)C values within each individual suggest fidelity to feeding grounds, differences in δ~(13)C values between males and females were likely a reflection of sexual segregation on the feeding areas, which begins during the juvenile stage. Mean δ~(15)N values of males (18.3%o) and females (18.2%o) would suggest that both groups feed at a similar trophic level; however a combination of differences in benthic versus pelagic and longitudinal foraging habitats would be masking real sex differences in trophic level, estimated for the species at 4.6. δ~(15)N and δ~(13)C values varied markedly between individuals of the same sex, suggesting the potential existence of diverse feeding strategies leading to a resource partitioning in this species. The alleged fetal growth layer has a δ~(15)N value 1.8 %o higher than the average of the adult female stage, suggesting that the fetal layer is more likely the product of the intensive nursing during the first month of life.
机译：稳定的同位素分析可用于检查哺乳动物的喂养策略。牙齿中牙本质的每年沉积生长层中的同位素允许评估个体的饮食发生饮食变化，因为这种代谢惰性的组织在沉积后不会被吸收。从圣贝尼托的滞留个体描述了年龄在1至11岁之间的北象海豹（Mirounga angustirostris）牙齿中氮（δ〜（15）N）和碳（δ〜（13）C）的稳定同位素比分布图以及墨西哥的马格达莱纳群岛（Magdalena Islands）和墨西哥的马格达莱纳群岛（Magdalena Islands）之间的距离（2000年至2009年）。δ〜（13）C和δ〜（15）N值随年龄的变化而不同，这表明一生的饮食习惯及其生理状况发生了变化。尽管每个人体内稳定的δ〜（13）C值表明对饲养场的忠诚，但雄性和雌性之间δ〜（13）C值的差异很可能反映了喂养区域的性别隔离，这是从幼年期开始的。男性（18.3％o）和女性（18.2％o）的平均δ〜（15）N值表明两组的营养水平相似。然而，底栖，中上层和纵向觅食生境的差异的结合将掩盖营养水平上的真实性别差异，据估计该物种为4.6。相同性别的个体之间的δ〜（15）N和δ〜（13）C值明显不同，表明该物种存在潜在的多种喂养策略，导致资源分配。所谓的胎儿生长层的δ〜（15）N值比成年女性阶段的平均值高1.8％o，这表明胎儿层在生命的第一个月中更可能是强化护理的产物。

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  • 来源
    《Marine ecology progress series》 |2012年第29期|p.229-241|共13页
  • 作者

    Marjorie Riofrio-Lazo; David Aurioles-Gamboa; Burney J. Le Boeuf;

  • 作者单位

    Laboratorio de Ecologfa de Pinnipedos 'Burney J. Le Boeuf, Centro Interdisciplinario de Ciencias Marinas,Institute Politecnico Nacional Ave. Institute Politecnico Nacional s. Col. Playa Palo de Santa Rita. C.P. 23096 La Paz,Baja California Sur, Mexico;

    Laboratorio de Ecologfa de Pinnipedos 'Burney J. Le Boeuf, Centro Interdisciplinario de Ciencias Marinas,Institute Politecnico Nacional Ave. Institute Politecnico Nacional s. Col. Playa Palo de Santa Rita. C.P. 23096 La Paz,Baja California Sur, Mexico;

    University Affiliated Research Center, 29 Clark Kerr Hall, University of California, Santa Cruz, California 95064, USA;

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  • 正文语种 eng
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  • 关键词

    mirounga angustirostris; stable isotope; dentine growth layer; ontogenetic dietary shifts; feeding strategy; isotope fractionation;

    机译：mirounga angustirostris;稳定同位素牙本质生长层个体饮食的转变;喂养策略;同位素分级;

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