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首页> 外文期刊>ICES Journal of Marine Science >Small-scale life history variability suggests potential for spatial mismatches in Atlantic cod management units
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Small-scale life history variability suggests potential for spatial mismatches in Atlantic cod management units

机译：小规模的生活史变异性表明大西洋鳕鱼管理单位存在空间不匹配的可能性

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摘要

A basic challenge to successful management and conflict resolution is to correctly identify the spatial scale at which strategies for harvesting are developed. For commercially exploited marine fish, distributional boundaries of many stocks are based on the premise that productivity is similar at spatial scales that represent a small fraction of an individual's potential migration distance. Within such confined geographic regions, differences among individual life history traits-primary determinants of population productivity-are assumed to be negligible. The empirical basis for these assumptions bears re-examination for some widely distributed species, such as Atlantic cod (Gadus morhua L.), for which there is evidence that life history structuring is evident at much finer scales than previously thought. Here, we focus on a unique system in the Norwegian Skagerrak, divided into inner and outer fjord habitats between which cod movement across distances of a few kilometres is limited and populations show signals of genetic differentiation. Based on back-calculated length-at-age data, cod in the inner fjord are systematically smaller at young ages (1-5 years) and are characterized by shorter asymptotic body lengths than cod in the outer fjord. Our work on growth and life history supports genetic analyses which indicate that productivity and resilience of widely distributed marine fish are likely to differ at considerably smaller spatial scales than those delineated by traditional stock management boundaries.
机译：成功管理和解决冲突的基本挑战是正确识别开发采伐策略的空间尺度。对于商业开发的海水鱼，许多种群的分布边界是基于这样的前提，即在空间尺度上生产力是相似的，代表了个人潜在迁移距离的一小部分。在这种有限的地理区域内，个人生活史特征（人口生产力的主要决定因素）之间的差异被认为可以忽略不计。这些假设的经验基础需要对一些广泛分布的物种进行重新检验，例如大西洋鳕（Gadus morhua L.），对于这些物种，有证据表明，其生活史结构在比以前认为的要小得多的尺度上是明显的。在这里，我们着眼于挪威Skagerrak的独特系统，该系统分为内峡湾栖息地和外峡湾栖息地，鳕鱼在几公里距离内的活动受到限制，并且种群显示出遗传分化的信号。根据反算的年龄长度数据，内峡湾的鳕鱼在幼年（1-5岁）时会系统地变小，并且其特征在于，其渐近体长比外峡湾的鳕鱼短。我们在生长和生活史方面的工作支持遗传分析，这些分析表明，与传统的种群管理边界所描绘的相比，广泛分布的海鱼的生产力和复原力在较小的空间尺度上可能会有所不同。

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  • 来源
    《ICES Journal of Marine Science》 |2016年第2期|286-292|共7页
  • 作者

    Kuparinen Anna; Roney Nancy E.; Oomen Rebekah A.; Hutchings Jeffrey A.; Olsen Esben M.;

  • 作者单位

    Univ Helsinki, Dept Environm Sci, POB 65, Helsinki 00014, Finland;

    Dalhousie Univ, Dept Biol, Halifax, NS, Canada;

    Dalhousie Univ, Dept Biol, Halifax, NS, Canada|Univ Oslo, Dept Biosci, CEES, POB 1066, N-0316 Oslo, Norway|Inst Marine Res, Flodevigen Marine Res Stn, N-4817 His, Norway;

    Dalhousie Univ, Dept Biol, Halifax, NS, Canada|Univ Oslo, Dept Biosci, CEES, POB 1066, N-0316 Oslo, Norway|Univ Agder, Dept Nat Sci, POB 422, N-4604 Kristiansand, Norway;

    Univ Oslo, Dept Biosci, CEES, POB 1066, N-0316 Oslo, Norway|Univ Agder, Dept Nat Sci, POB 422, N-4604 Kristiansand, Norway|Inst Marine Res, Flodevigen Marine Res Stn, N-4817 His, Norway;

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  • 正文语种 eng
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  • 关键词

    asymptotic body size; Gadus morhua; growth; length-at-age; otolith; Skagerrak; von Bertalanffy;

    机译：渐近体型;戈达斯;生长;年龄;耳石;Skagerrak;冯·贝塔兰菲;

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