...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>ICES Journal of Marine Science >The relative importance of sub-populations to the Gulf of Maine stock of Atlantic cod
【24h】

The relative importance of sub-populations to the Gulf of Maine stock of Atlantic cod

机译：亚种群对缅因州海湾鳕鱼大西洋种群的相对重要性

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Discriminating among sympatric sub-populations is critical not only for the investigation of fish population structure, but also for effective fishery management. The Gulf of Maine stock of Atlantic cod contains two genetically distinct sub-populations whose spawning grounds overlap in space, but not season. Lack of a practical tool for discriminating between these spring and winter spawners has thus far prevented addressing metapopulation structure in stock assessments and fishery management plans. To address this issue, we developed a simple approach to discriminate between the sympatric sub-populations that relies on internal otolith structures. Using a logistic regression model fit to training data (n = 577) and evaluated through cross-validation, we correctly classified individuals with 81% accuracy and predicted the overall sub-population mixture within 1%. Applying the model to a broader population dataset (n = 1642) revealed that spring-spawned cod are more concentrated within closed fishing areas and therefore experience a lower mortality rate. However, despite dominating older age classes and comprising a large fraction of the spawning stock, these spring cod contribute little to recruitment. This apparent sub-population difference in the stock-recruitment relationship has important consequences for assessment models and the success of management measures designed to rebuild the stock.
机译：区分同胞亚种群不仅对于调查鱼类种群结构至关重要，而且对于有效的渔业管理也至关重要。缅因州海湾大西洋鳕鱼种群包含两个遗传上不同的亚种群，它们的产卵场在空间上重叠，但在季节上不重叠。迄今为止，由于缺乏用于区分这些春季和冬季产卵场的实用工具，因此无法解决种群评估和渔业管理计划中的种群分布问题。为了解决这个问题，我们开发了一种简单的方法来区分依赖于内部耳石结构的同胞亚群。使用适合训练数据的对数回归模型（n = 577），并通过交叉验证进行评估，我们以81％的准确度对个人进行了正确分类，并预测整体亚人群混合物在1％以内。将模型应用于更广泛的人口数据集（n = 1642）后，发现春季产的鳕鱼更集中在封闭的捕捞区内，因此死亡率较低。然而，尽管春季老鳕鱼占主导地位，并占很大一部分产卵量，但这些春季鳕鱼对招募的贡献很小。库存-招聘关系中明显的亚群差异对评估模型和旨在重建库存的管理措施的成功具有重要的影响。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号