...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Nordic Journal of Freshwater Research >Growth and Smoltification of Anadromous Arctic Char Presmolts in Lentic and Lotic Habitats
【24h】

Growth and Smoltification of Anadromous Arctic Char Presmolts in Lentic and Lotic Habitats

机译：极寒和极寒栖息地中异常北极红点鲑预成型体的生长和糖化。

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

Presmolt growth rate, smolt age and size were studied in three anadromous populations of Arctic char Salvelinus alpinus in northern Norway. All populations live sympatrically with Atlantic salmon Salmo salar and anadromous brown trout Salmo trutta. Beiar Arctic char inhabit the main river (the River Beiarelva) in running water, without access to any lake. Saltdal Arctic char mainly spawn, and their young remain until smoltification, in a lake on a tributary of the River Saltdalselva. This is the only lake in the watercourse accessible for anadromous fish. Arctic char in the Hals watercourse mainly inhabit the lake Storvatnet and the main tributary of this lake, while the main river downstream from Storvatnet (the River Halselva) is less utilized by char. Smolts of Beiar char were youngest and smallest, and annual growth rates were higher than in the two other populations. Variation in smolt age and annual growth rates was largest in Hals char. Arctic char presmolts living in lotic habitats grow faster, smoltify at a lower age and at a smaller size than char living in lentic habitats. Freshwater temperature in summer seems to be important for the utilization of running waters in the way that Arctic char presmolts appear to avoid warmer river stretches.
机译：在挪威北部的三个北极红点鲑Salvelinus alpinus的无性种群中，研究了它们的前性生长速率，中性年龄和大小。所有种群都与大西洋鲑鱼Salmo撒拉族和褐鳟鳟鱼salmo trutta一起生活。 Beiar北极红点鲑栖息在主要河流（Beiarelva河）中，没有任何湖泊。盐沼北极红点鲑主要在盐沼河支流的一个湖中产卵，并且它们的幼体一直保留到被糖化。这是河道中唯一可以捕食鱼类的湖泊。哈尔斯河道中的北极鲑鱼主要栖息在斯托尔瓦涅特湖和该湖的主要支流中，而斯托尔瓦涅特河下游的主要河流（哈尔瑟尔瓦河）则很少使用鲑鱼。贝亚尔炭的幼虫最小，最小，年增长率高于其他两个种群。在哈尔斯炭中，幼龄和年增长率的变化最大。与居住在lentic栖息地中的char相比，生活在抽水栖息地中的北极char presmolts生长更快，在更低的年龄和更小的范围内进行mol化。夏季的淡水温度对于利用自来水似乎很重要，因为北极的炭黑预成型体似乎可以避免河水变暖。

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