首页> 外文期刊>Evolution: International Journal of Organic Evolution >Concurrent natural and sexual selection in wild male sockeye salmon, Oncorhynchus nerka
【24h】

Concurrent natural and sexual selection in wild male sockeye salmon, Oncorhynchus nerka

机译:同时在野生雄性红鲑鲑,Oncorhynchus nerka中进行自然和性别选择

获取原文
获取原文并翻译 | 示例
       

摘要

Concurrent natural and sexual selection have been inferred from laboratory and comparative studies in a number of taxa, but are rarely measured in natural populations. Because the interaction of these two general categories of selection may be complex when they occur simultaneously, empirical evidence from natural populations would help us to understand this interaction and probably give us greater insight into each separate episode as well. In male sockeye salmon, sexual selection for larger body size has been indicated in both deep and shallow water habitats. However, in shallow habitats male sockeye are generally smaller and less deep-bodied than in deep habitats, a difference that has been ascribed to natural selection. We measured concurrent natural and sexual selection in two years on breeding male sockeye salmon with respect to body size, body shape, and time of arrival to the breeding grounds. Natural selection was variable in effect and sexual selection was variable in intensity in these two years. The patterns of selection also appear to be interdependent; areas where predation on spawning adults is not intense have yielded different patterns of sexual selection than those measured here. It appears that some of the body shape differences in sockeye salmon associated with different spawning habitats, which were previously attributed to selective mortality, may be a result of different patterns of sexual selection in the different habitats. Total selection resulting from the combination of both natural and sexual selection was less intense than either natural or sexual selection in most cases. Measurement of concurrent selection episodes in nature may help us to understand whether the pattern of differential sexual selection is common, and whether observed patterns of habitat-related differentiation may be due to differences in sexual selection.
机译:从许多类群的实验室和比较研究中可以推断出自然选择和性选择同时进行,但很少在自然种群中进行测量。由于这两个一般选择类别的相互作用在同时发生时可能很复杂,因此来自自然种群的经验证据将有助于我们理解这种相互作用,并可能使我们对每个单独的事件都有更深入的了解。在雄性红鲑鱼中,已表明在深水和浅水生境中都可以选择较大的体型。但是,在浅层生境中,雄性红大概要比在深层生境中更小,体型更深,这是自然选择所致。我们在两年内对雄性红鲑鱼的体型,体型和到达繁殖场的时间进行了同时自然和性别选择的测量。在这两年中,自然选择的影响可变,而性选择的强度却可变。选择的模式似乎也是相互依存的。对产卵成虫的捕食并不强烈的地区与这里测得的性别选择方式不同。看来,以前归因于选择性死亡率的与不同产卵栖息地相关的红鲑鱼的某些身体形状差异可能是由于不同栖息地的性选择方式不同而导致的。在大多数情况下,自然选择和性选择结合产生的总选择强度不及自然选择或性选择。测量自然界中同时发生的选择事件可能有助于我们了解差异性选择的模式是否普遍,以及观察到的与栖息地相关的差异化模式是否可能是由于性别选择的差异所致。

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