• 主题
高级搜索  >
历史搜索 清空历史
首页> 美国卫生研究院文献>Conservation Physiology >Nutritional correlates of the overwintering and seaward migratory decisions and long-term survival of post-spawning Atlantic salmon
【2h】

Nutritional correlates of the overwintering and seaward migratory decisions and long-term survival of post-spawning Atlantic salmon

机译：产卵后大西洋鲑越冬和迁徙决定与长期存活的营养相关性

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务，本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文，但由于OA文献来源多样且变更频繁，仍可能出现获取不到、文献不完整或与标题不符等情况，如果获取不到我们将提供退款服务。请知悉。
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Despite the importance of iteroparity (i.e. repeated spawning) for the viability of Atlantic salmon populations, little is known about the factors influencing the migratory behaviour and survival prospect of post-spawned individuals (kelts). To test the hypothesis that post-spawning nutritional condition underlies differences in spatiotemporal aspects of the habitat use and survival of migrating Atlantic salmon kelts, we physiologically sampled and acoustically tagged 25 individuals from the Middle River, Nova Scotia in autumn 2015. Kelts were subsequently tracked within their natal river during the winter months, and as far as 650 km away along known migration pathways towards the Labrador Sea and Greenland. Some kelts were detected nearly 2 years later, upon their return to the natal river for repeat spawning. Overall, kelts in poor or depleted post-spawning nutritional state (i.e. low body condition index or plasma triglyceride level): (i) initiated down-river migration earlier than higher condition kelts; (ii) experienced higher overwinter mortality in the natal river; (iii) tended to spend greater time in the estuary before moving to sea and (iv) did not progress as far in the marine environment, with a reduced probability of future, repeat spawning. Our findings suggest that initial differences in post-spawning condition are carried through subsequent migratory stages, which can ultimately affect repeat-spawning potential. These results point to the importance of lipid storage and mobilisation in Atlantic salmon kelts for mediating post-spawning migratory behaviour and survival.
机译：尽管等价性（即重复产卵）对于大西洋鲑鱼种群的生存至关重要，但对影响产卵后个体（kelts）迁徙行为和生存前景的因素知之甚少。为了检验产卵后营养状况是栖息地使用时空方面和迁徙大西洋鲑鱼kelt​​s生存差异的基础的假设，我们在2015年秋季对来自新斯科舍省Middle River的25个人进行了生理采样和声学标记。随后追踪了kelts在冬季，他们会在其出生的河流中，沿着通往拉布拉多海和格陵兰岛的已知迁移路径，最远可达650公里。在返回母体河重复产卵近两年后，发现了一些海藻。总的来说，产后营养状态差或已耗尽的kelts（即低身体状况指数或血浆甘油三酸酯水平）：（i）比较高条件的kelts更早地开始了下游迁移； （ii）纳塔尔河的越冬死亡率较高； （iii）在出海之前倾向于在河口上花费更多的时间，并且（iv）在海洋环境中没有进展得那么远，未来再次产卵的可能性降低了。我们的发现表明，产卵后条件的最初差异是通过随后的迁徙阶段进行的，这最终会影响重复产卵的潜力。这些结果表明，脂质介导和储藏在大西洋鲑鱼鳞茎中对于调动产卵后迁徙行为和生存很重要。

著录项

相似文献

  • 外文文献
  • 中文文献
代理获取

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