• 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>other >Sexual Selection and the Evolution of Male Reproductive Traits in Benthic Octopuses
【2h】

Sexual Selection and the Evolution of Male Reproductive Traits in Benthic Octopuses

机译：底栖章鱼的性选择和雄性生殖性状的演变

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

Competition between same-sex organisms, or intra-sexual selection, can occur before and after mating, and include processes such as sperm competition and cryptic female choice. One of the consequences of intra-sexual selection is that male reproductive traits tend to evolve and diverge at high rates. In benthic octopuses, females often mate with more than one male in a single reproductive event, opening the venue for intra-sexual selection at multiple levels. For instance, males transfer spermatophores through hectocotylus, and can remove the spermatophores left by other males. Considering the limited evidence on post-copula competition in benthic octopuses, and the potential to affect the evolution of reproductive traits within octopodids, we put this hypothesis to a test employing a phylogenetic comparative approach. We combined data on hectocotylized arm length (HAL), ligula length (LL), spermatophore length (SL) with a Bayesian molecular phylogeny of 87 species, to analyze how reproductive traits have diverged across lineages and covary with body size (mantle length; ML). First, additionally to ML, we estimated the phylogenetic signal (λ) and mode of evolution (κ) in each reproductive trait. Second, we performed phylogenetic regressions to quantify the association among reproductive traits and their co-variation with ML. This analysis allowed us to estimate the phenotypic change along a branch into the phylogeny, and whether selection may have played a role in the evolution and diversification of specific clades. Estimations of λ were always high (>0.75), indicating concordance between the traits and the topology of the phylogenetic tree. Low values of κ (<1.0) suggested that evolution depends on branch lengths. All reproductive traits exhibiting a positive relation with ML (β > 0.5 in all cases). Overall, evolutionary rate models applied to the SL-ML regression suggested that octopuses of the family Megaleledonidae have evolved larger spermatophores than expected for their size. The regression HAL-ML indicated that HAL was more variable in Megaleledonidae than in the remaining clades, suggesting that the high divergence across species within this group might partially reflect intra-sexual selection. These results support the hypothesis that, at least in some lineages, sexual selection may account for the divergence in reproductive traits of male octopuses.
机译：同性生物之间的竞争或性别选择，可能在交配之前和之后发生，并且包括诸如精子竞争和女性隐性选择的过程。性别选择的后果之一是男性生殖特征倾向于以高比率进化和分化。在底栖章鱼中，雌性通常在一次生殖活动中与多于一名雄性交配，为多层次的性内部选择提供了场所。例如，雄性通过角膜轴转移精原细胞，并可以去除其他雄性留下的精原细胞。考虑到底栖章鱼的后系竞争竞争的有限证据，以及影响章鱼内生殖性状进化的潜力，我们将此假设进行了系统进化比较方法的检验。我们结合了87个物种的贝叶斯化臂长（HAL），舌状叶长度（LL），精子长度（SL）和贝叶斯分子系统发育的数据，分析了生殖性状如何跨越血统和随体型变化的子房（地幔长度； ML） ）。首先，除了ML，我们还估算了每个生殖性状的系统发育信号（λ）和进化模式（κ）。其次，我们进行了系统发育回归，以量化生殖性状之间的关联及其与ML的协变。这种分析使我们能够估计沿着分支进入系统发育的表型变化，以及选择是否可能在特定进化枝的进化和多样化中发挥了作用。 λ的估计值始终很高（> 0.75），这表明系统发育树的性状和拓扑之间是一致的。较低的κ值（<1.0）表明进化取决于分支长度。所有生殖性状均与ML呈正相关（在所有情况下β> 0.5）。总体而言，应用于SL-ML回归的进化速率模型表明，巨嘴兽科的章鱼已经进化出了比预期大小更大的精原细胞。回归分析HAL-ML表明，与其他进化枝相比，Megaleledonidae中的HAL变异更大，这表明该组物种间的高度差异可能部分反映了性内选择。这些结果支持以下假设：至少在某些血统中，性别选择可能解释了男性章鱼生殖性状的差异。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
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