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首页> 外文期刊>Oceanography >Resolving Hjort's Dilemma: How Is Recruitment Related to Spawning Stock Biomass in Marine Fish?
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Resolving Hjort's Dilemma: How Is Recruitment Related to Spawning Stock Biomass in Marine Fish?

机译:解决Hjort的难题:招聘与在海水鱼类中产生种群生物量有何关系?

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摘要

The relationship between spawning fish abundance and the number of offspring, the so-called stock-recruitment relationship, is crucial for fisheries management and conservation measures. Using the most comprehensive data set ever assembled, we quantify this relationship for 211 fish stocks worldwide, revealing a global pattern with a pervasive asymptotic shape that shows increasing recruitment reaching an upper limit for values around half to two-thirds of parental biomass. This corroborates previous theoretical and modeling results. However, parental biomass is a predictor for only 5% to 15% of the variance in recruitment, demonstrating the weak predictive power of the stock-recruitment relationship in marine fish populations. Thus, there is a need to move rapidly toward models that integrate environmental conditions and species interactions in fisheries stock assessment and management, as suggested by Johan Hjort 100 years ago.
机译:产卵量与后代数量之间的关系,即所谓的种群补充关系,对渔业管理和保护措施至关重要。使用有史以来收集的最全面的数据集,我们对全球211种鱼类种群的这种关系进行了量化,揭示了一种具有普遍渐近形状的全球模式,显示出增加的募集量达到了父母生物量的一半至三分之二的上限。这证实了先前的理论和建模结果。然而,父母生物量仅是招聘变化的5%到15%的预测因子,证明了海水鱼类种群中种群与招聘关系的预测能力较弱。因此,正如Johan Hjort早在100年前所建议的那样,有必要迅速走向将环境条件和物种相互作用纳入渔业种群评估和管理的模型。

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  • 来源
    《Oceanography》 |2014年第4期|42-47|共6页
  • 作者单位

    Institut de Recherche pour le Developpement, Centre de Recherche Halieutique Mediterraneenne et Tropicale, Sete, France;

    Institut francals de recherche pour l'exploitation de la mer (IFREMER), Centre de Recherche Halieutique Mediterraneenne et Tropicaie, Sete, France;

    Institut de Recherche pour le Developpement, Centre de Recherche Halieutique Mediterraneenne et Tropicale, Sete, France;

    IFREMER, Centre de Recherche Halieutique Mediterraneenne et Tropicale, Sete, France;

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  • 正文语种 eng
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