• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Advances in limnology >Factors affecting growth of lake whitefish in the upper Laurentian Great Lakes
【24h】

Factors affecting growth of lake whitefish in the upper Laurentian Great Lakes

机译：劳伦山脉五大湖上游影响白鲑生长的因素

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

Lake whitefish support the single largest and most valuable commercial fishery in the Lau-rentian Great Lakes. Recently, fishery managers have reported declining growth and productivity of lake whitefish in the upper Great Lakes. Several causes for the declines noted in individual growth rates have been proposed. These include changes in: 1) lake whitefish density, 2) food quality and abundance, 3) population genetics, and 4) climatic conditions. We evaluated the relationships between each of these factors and lake whitefish growth in selected regions of the upper Great Lakes. Specifically, we examined the timing of the changes in the environment with lake whitefish growth to determine causal relationships. Lake whitefish growth declines began with the development of a very strong 1991 year class due to favorable climatic conditions, leading to density dependent growth dynamics, which were exacerbated by a significant decline in the high-energy, benthic prey item (Diporeia spp.) toward the latter part of the 1990's. It appears that declines in Diporeia density, which are related to the introduction of two invasive species (Dreissena spp.) have resulted in a lower carrying capacity for lake white-fish in the upper Great Lakes. As such, managers need to implement conservative harvest strategies that protect the viability of these stocks under lower productivity conditions.
机译：怀特菲什湖支持劳伦大湖中最大，最有价值的商业渔业。最近，渔业管理人员报告说，大湖上游的白鲑的生长和生产力下降。已经提出了导致个人增长率下降的几种原因。其中包括以下方面的变化：1）湖白鲑密度，2）食物质量和丰度，3）种群遗传学和4）气候条件。我们评估了这些因素中的每一个与大湖上游特定区域中湖白鲑生长之间的关系。具体来说，我们研究了随着白鲑湖生长而改变环境的时机，以确定因果关系。由于有利的气候条件，湖白鲑的生长下降始于非常强的1991年级，导致密度依赖性生长动力学，高能底栖猎物（Diporeia spp。）的显着下降加剧了这种增长。 1990年代后期。似乎与两种入侵物种（Dreissena spp。）的引入有关的二孢子虫密度的下降导致了大湖上游的白鱼的承载能力降低。因此，管理人员需要实施保守的收获策略，以保护这些种群在较低生产率条件下的生存能力。

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