...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Conservation Biology >Estimating natural selection acting on stream-dwelling Atlantic salmon: Implications for the restoration of extirpated populations
【24h】

Estimating natural selection acting on stream-dwelling Atlantic salmon: Implications for the restoration of extirpated populations

机译：估计对居住在大西洋鲑鱼上的自然选择的影响：对被灭绝种群恢复的影响

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

Efforts to restore populations to locations from which they have been extirpated may be hampered by maladaptation in the introduced group because they came from a different environment. Estimates of natural selection acting on the new population can be used to deduce maladaptation and tailor efforts to reduce its effects. We estimated natural selection acting on Atlantic salmon (Salmo salar) undergoing restoration to the Connecticut River (U.S.A.). More than 3500 mark-recapture records in a small tributary (West Brook, Massachusetts) were used to estimate selection acting on body length, body mass, condition factor, and growth. Estimates were obtained for three to four different cohorts, two age classes (second and third years of life), and two seasons (winter and summer). We found little evidence that any of the traits were subject to strong directional selection (favoring larger or smaller trait values). Interestingly, fish that were larger or had higher condition factors rarely survived at higher rates, a result conflicting with the conventional "bigger is better" expectation. We also found little evidence that any of the traits were subject to strong or consistent stabilizing selection (favoring trait values near the mean). Our results suggest that the specific traits we examined are not limiting adaptation and are probably not preventing the population from becoming self-sustaining. Future efforts should concentrate on other potentially limiting traits, such as the timing of smolt migration. Our results also suggest that any additional introductions of exogenous fish need not be concentrated on the size or growth of juveniles in potential source populations. nte. [References: 45]
机译：由于种群来自不同的环境，因此引入种群中的适应不良可能会阻碍将种群恢复到已被灭绝的位置的努力。对新种群起作用的自然选择的估计值可用于推断适应不良，并做出努力以减少其影响。我们估算了对正在恢复到康涅狄格河（美国）的大西洋鲑鱼（Salmo salar）的自然选择。在一个小支流中（马萨诸塞州西布鲁克），有3500多个重获标记的记录被用来估计对体长，体重，条件因子和生长起作用的选择。获得了三至四个不同队列，两个年龄段（生命的第二和第三年）以及两个季节（冬季和夏季）的估计值。我们几乎没有证据表明任何性状都受到强烈的方向选择（有利于更大或更小的性状值）。有趣的是，较大或条件因子较高的鱼类很少能以较高的比率存活，结果与传统的“越大越好”的预期相矛盾。我们还没有发现任何证据表明任何性状都经历了强烈或一致的稳定选择（有利于接近均值的性状值）。我们的结果表明，我们研究的特定特征并不限制适应，也可能无法阻止人群自我维持。未来的工作应集中在其他可能限制的性状上，例如迁移的时间。我们的结果还表明，外来鱼类的任何其他引进都不必集中于潜在来源种群中幼鱼的大小或生长。 NTE。 [参考：45]

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