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首页> 外文期刊>ICES Journal of Marine Science >Species- and size-related patterns in stable isotopes and mercury concentrations in fish help refine marine ecosystem indicators and provide evidence for distinct management units for hake in the Northeast Atlantic
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Species- and size-related patterns in stable isotopes and mercury concentrations in fish help refine marine ecosystem indicators and provide evidence for distinct management units for hake in the Northeast Atlantic

机译：鱼中稳定同位素和鱼类中汞的浓度与物种和大小有关的模式有助于完善海洋生态系统指标，并为东北大西洋鳕鱼的不同管理单位提供证据

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摘要

Recent European environmental policies argue for the development of indicators of the ecological status of ecosystems that are easy to implement and powerful enough to detect changes quickly. For instance, some indicators that are currently proposed for monitoring foodweb structure and functioning are based on the size of organisms, using size as a proxy for trophic level. However, these indicators do not necessarily accurately reflect the underlying trophic structure and dynamics to follow. Ecological tracers (i.e. chemical parameters measured in consumer tissues to infer the trophic ecology of organisms) may serve as complementary indicators of trophic level, and may also help distinguish different populations of a species when more commonly used methods (e.g. genetic, age determination) present their own limitations. Here, we analysed the potential of muscle δ~(13)C and δ~(15)N values and of muscle mercury (Hg) concentrations to depict size-related trophic habits of different fish species. We expected that intra- and interspecific variation in these ecological tracers could be helpful in refining currently proposed indicators of marine ecosystems, and also help in discriminating management unitsfor some species. Four fish species were selected for their economical and/or ecological importance in the Bay of Biscay (Northeast Atlantic): whiting Merlangius merlangus, European hake Merluccius merluccius, Atlantic horse mackerel Trachurus tra-churus and anglerfish Lophius piscatorius. Muscle δ~(13)C and δ~(15)N values segregated the species and enabled us to discriminate species-specific feeding strategies with increasing size of individuals. Fish body size was not always linearly correlated with δ~(15)N or trophic level. In contrast, Hg concentrations and size-related Hg patterns were more similar from species to species. Interestingly, muscle δ~(15)N values together with Hg concentrations segregated the two putative stocks of European hake within the Bay of Biscay. Hence, we propose the combined use of ecological tracers as a promising method for accurately assigning a consumer to a trophic guild, investigating Hg trophodynamics in foodwebs, and helping discriminate distinct ecological populations within a species when defining management units.
机译：最近的欧洲环境政策主张开发易于实施且功能强大，足以迅速发现变化的生态系统生态状况指标。例如，目前提出的一些监测食物网结构和功能的指标是基于生物体的大小，使用大小作为营养级别的代表。但是，这些指标不一定能准确反映出潜在的营养结构和动态。生态示踪剂（即在消费性组织中测得的化学参数以推断生物的营养生态学）可以作为营养水平的补充指标，并且当存在更常用的方法（例如遗传，年龄确定）时，也可以帮助区分物种的不同种群自己的局限性。在这里，我们分析了肌肉δ〜（13）C和δ〜（15）N值以及肌肉汞（Hg）浓度的潜力，以描绘不同鱼类物种与大小相关的营养习惯。我们希望这些生态示踪剂的种内和种间变化可能有助于完善目前提议的海洋生态系统指标，也有助于区分某些物种的管理单位。在比斯开湾（东北大西洋）的经济和/或生态重要性中，选择了四种鱼类：白垩纪的墨郎鱼，欧洲无须鳕的墨鱼，大西洋鲭鱼Trachurus tra-churus和angle鱼Lophius piscatorius。肌肉的δ〜（13）C和δ〜（15）N值隔离了物种，使我们能够区分个体数量增加而特定物种的进食策略。鱼体大小并不总是与δ〜（15）N或营养水平呈线性关系。相比之下，物种之间的汞浓度和与尺寸有关的汞模式更为相似。有趣的是，肌肉δ〜（15）N值与汞浓度将比斯开湾内的欧洲无须鳕的两个假定种群隔离开来。因此，我们提出结合使用生态示踪剂作为一种有前途的方法，可以准确地将消费者分配给营养协会，研究食物网中的汞营养动力学，并在定义管理单位时帮助区分物种中不同的生态种群。

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  • 来源
    《ICES Journal of Marine Science》 |2014年第5期|1073-1087|共15页
  • 作者

    T. Chouvelon; F. Caurant; Y. Cherel; B. Simon-Bouhet; J. Spitz; P. Bustamante;

  • 作者单位

    Littoral Environnement et Societes, UMR 7266 CNRS - Universite de La Rochelle, 2 rue Olympe de Gouges, 17000 La Rochelle, France;

    Littoral Environnement et Societes, UMR 7266 CNRS - Universite de La Rochelle, 2 rue Olympe de Gouges, 17000 La Rochelle, France;

    Centre d'Etudes Biologiques de Chize, UPR 1934 du CNRS, BP 14, 79360 Villiers-en-Bois, France;

    Littoral Environnement et Societes, UMR 7266 CNRS - Universite de La Rochelle, 2 rue Olympe de Gouges, 17000 La Rochelle, France;

    Littoral Environnement et Societes, UMR 7266 CNRS - Universite de La Rochelle, 2 rue Olympe de Gouges, 17000 La Rochelle, France,Marine Mammal Research Unit, Fisheries Centre, University of British Columbia, 2202 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada;

    Littoral Environnement et Societes, UMR 7266 CNRS - Universite de La Rochelle, 2 rue Olympe de Gouges, 17000 La Rochelle, France;

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