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首页> 外文期刊>Journal of great lakes research >Control rule performance for intermixing lake whitefish populations in the 1836 Treaty waters of the Great Lakes: A simulation-based evaluation
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Control rule performance for intermixing lake whitefish populations in the 1836 Treaty waters of the Great Lakes: A simulation-based evaluation

机译：大湖区1836年条约水域中混合的白鲑种群控制规则的性能：基于模拟的评估

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摘要

We conducted a simulation-based evaluation exploring the effects of population intermixing on the current 65% total annual mortality control rule used to manage lake whitefish [Coregonus dupeaformis) fisheries in the 1836 Treaty waters of the Laurentian Great Lakes. The simulations incorporated intermixing among four populations with characteristics similar to those of lake whitefish in northern lakes Huron and Michigan. Dynamics of each population were simulated for 100 years with each stock exploited by a single fishery. An age-structured assessment of each stock was conducted every third year, with the abundance, mortality, and recruitment estimates used with the current control rule to set future harvest limits. Overall aggregate yield of the modeled system was generally not affected by intermixing, but did depend on assumed productivity levels. Mean annual yields for individual fisheries were sensitive to mixing levels, with yields from fisheries coinciding with low productivity spawning populations often similar to those coinciding with high productivity populations when intermixing occurred. Variability in yield tended to decrease slightly as mixing rates increased. Intermixing did not have a large influence on measures of spawning population sustainability, but detection of declining population sizes in low productivity populations may be difficult when intermixing occurs because of fishery yields remaining high due to immigration offish from other spawning areas. This raises concern about the current control rule given that low productivity populations had spawning population sizes less than 20% of the unfished level in most years.
机译：我们进行了基于模拟的评估，探讨了人口混杂对1836年《劳伦底大湖区》条约水域中用于管理湖泊白鲑（Coregonus dupeaformis）渔业的当前年度总死亡率控制规则的65％的影响。这些模拟结合了四个种群之间的混合，其特征类似于北部休伦湖和密歇根湖的白鲑。对每个种群的动态进行了100年的模拟，单个渔业开发了每种种群。每三年对每个种群进行年龄结构评估，将丰度，死亡率和招聘估计数与当前控制规则结合使用，以设定未来的收获极限。建模系统的总总产量通常不受混合影响，但确实取决于假定的生产率水平。单个渔业的平均年产量对混合水平敏感，渔业的产量与低产卵种群相吻合，往往与发生混合时与高生产力种群相吻合。随着混合速率的增加，产率的变化趋于稍微降低。混交对产卵种群可持续性的衡量没有很大的影响，但是在混种发生时，很难检测低生产率种群种群数量的下降，因为由于其他产卵区的鱼类移民，渔业产量仍然很高。鉴于多数年份低生产率种群的产卵种群不到未捕捞水平的20％，这引起了人们对当前控制规则的关注。

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  • 来源
    《Journal of great lakes research》 |2012年第4期|686-698|共13页
  • 作者

    Kyle J. Molton; Travis 0. Brenden; James R. Bence;

  • 作者单位

    Quantitative Fisheries Center, Department of Fisheries and Wildlife, Michigan State University, 293 Farm Lane, Room 153, East Lansing, MI 48824, USA;

    Quantitative Fisheries Center, Department of Fisheries and Wildlife, Michigan State University, 293 Farm Lane, Room 153, East Lansing, MI 48824, USA;

    Quantitative Fisheries Center, Department of Fisheries and Wildlife, Michigan State University, 293 Farm Lane, Room 153, East Lansing, MI 48824, USA;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    lake whitefish; intermixing; harvest control rule; productivity; stochastic simulation;

    机译：怀特菲什湖混合收获控制规则;生产率;随机模拟;

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