...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Marine ecology progress series >Short-term temporal variation in inshore/offshore feeding and trophic niche of Atlantic salmon Salmo salar off West Greenland
【24h】

Short-term temporal variation in inshore/offshore feeding and trophic niche of Atlantic salmon Salmo salar off West Greenland

机译：西格陵兰岛外大西洋鲑鱼鲑的近岸/近海摄食和营养位的短期时间变化

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

The marine portion of Atlantic salmon Salmo salar L. life history is not well understood, with many populations exhibiting declines in survival and growth linked to changes in the food web. Atlantic salmon of North American origin feed along the coast of West Greenland from August to November and are exposed to a variety of different ecosystems and hydrographic and environmental regimes that affect marine food webs. Here we used stable isotopes to assess the reliance of Atlantic salmon feeding on inshore prey resources and its associated seasonal variation, and examine the correlations of varying inshore resource use with size, condition and trophic niche width. On average, Atlantic salmon relied on inshore resources for 38% of their diet (range of 0-84 %). The reliance on inshore prey increased throughout the season, as did size and condition. Although differences between inshore and offshore feeding fish were small, the resulting implications of associated differences in size and condition on subsequent survival and spawning success suggest important biological consequences of feeding habitat choice. The variation in inshore resource isotope values mirrored hydrographic variation and associated changes in prey related to glacial input, frontal zones between inshore and offshore water masses and nutrient input from run-off. Increasing reliance on inshore feeding may be due to a high abundance of spawning capelin Mallotus villosus in the fjords. Omnivory was found to be highest in fish using both the inshore and offshore environments, suggesting a greater diversity of diet in these fish.
机译：人们对大西洋鲑Salmo salar L.的海洋部分的生活历史了解甚少，许多种群的生存和生长下降与食物网的变化有关。北美起源的大西洋鲑鱼于8月至11月在西格陵兰岛沿岸觅食，并受到影响海洋食物网的各种不同生态系统以及水文和环境状况的影响。在这里，我们使用稳定的同位素来评估大西洋鲑鱼对沿海捕食资源的依赖及其相关的季节变化，并研究沿海食用资源的变化与大小，条件和营养生态位宽度之间的相关性。平均而言，大西洋鲑的饮食中有38％依赖于沿海资源（范围为0-84％）。在整个季节中，对近海猎物的依赖程度以及条件和大小都增加了。尽管近岸和近海捕捞鱼之间的差异很小，但相关的大小和条件差异对随后的存活和产卵成功的影响表明，选择捕食栖息地具有重要的生物学后果。近岸资源同位素值的变化反映了水文变化和与冰河输入，近岸和近海水团之间的锋区和径流营养输入有关的猎物变化。越来越多地依赖近海觅食可能是由于峡湾中产卵的毛鳞鱼Mallotus villosus数量很多。在近海和近海环境中，杂食性鱼类的含量最高，这表明这些鱼类的饮食结构更加多样化。

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