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Atlantic cod (Gadus morhua) feeding for ecosystem-based management and sustainability in Newfoundland and Labrador marine ecosystems

机译:大西洋鳕鱼(Gadus morhua)为纽芬兰和拉布拉多海洋生态系统的生态系统管理和可持续性提供食物

摘要

The purpose of this study is to challenge long-standing assumptions on Atlantic cod (Gadus morhua) feeding around Newfoundland and Labrador, Canada, and provide information that will be useful for the next generation of ecosystem-based models. Using stomach content analysis and published cod stomach data I address two primary questions: Do cod cease feeding during spawning? Does the cod diet reflect changes in prey assemblages in the ecosystem? Spatial and temporal diet variation was additionally analyzed. Regional variation was paramount such that diet diversity, mirroring ecosystem diversity, increased with decreasing latitude. Contrary to current assumptions, feeding continued through spawning. The stomach content contribution of shrimp reflect environmental trends in these prey assemblages over the past 65 years, while crab, a minor part of the cod diet, does not reflect abundance changes. Capelin appeared preferably consumed when encountered. Cod are not complete generalist feeders but select for certain energy rich prey.
机译:这项研究的目的是挑战关于在加拿大纽芬兰和拉布拉多周围觅食的大西洋鳕(Gadus morhua)的长期假设,并提供可用于下一代基于生态系统的模型的信息。使用胃内容物分析和发布的鳕鱼胃数据,我解决了两个主要问题:鳕鱼在产卵期间是否停止喂食?鳕鱼的饮食是否反映了生态系统中猎物组合的变化?时空饮食变化也进行了分析。区域差异至关重要,以至于随着纬度的减少,反映生态系统多样性的饮食多样性也随之增加。与目前的假设相反,通过产卵继续喂养。虾对胃含量的贡献反映了过去65年中这些猎物组合的环境趋势,而蟹(占鳕鱼饮食的一小部分)没有反映出丰度的变化。遇见毛鳞鱼似乎更可取。鳕鱼不是完全的通才饲养者,而是选择某些能量丰富的猎物。

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    Krumsick Kyle;

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  • 年度 2014
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