Ontogenetic convergence and evolution of foot morphology in European cave salamanders (Family: Plethodontidae).
Ontogenetic convergence and evolution of foot morphology in European cave salamanders (Family: Plethodontidae).
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DOI：
10.1186/1471-2148-10-216
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发表时间：
2010-07-16
影响因子：
3.4
通讯作者：
Nistri A
中科院分区：
文献类型：
--
作者：
Adams DC;Nistri A
进化生物学的一个主要目标是了解表型多样性的进化。自然选择和性选择在产生表型适应中起着重要作用，生物力学要求和发育机制介导了表型进化的模式。对于许多性状，选择和发育成分的相对重要性仍然研究不足。我们调查了8种欧洲plethodontid洞穴蝾螈的足形态的个体发育轨迹，以检验成年足形态适合攀爬的假设。使用几何形态测量学和其他方法，我们发现，在五个物种的发育模式显示在生长过程中的形态变化不大（等距），其中广泛的趾间织带在成人最好的解释为保留少年形态状态。相比之下，三个物种表现出显着的异速生长，在生长过程中增加趾间织带。系统发育分析表明，在这一谱系中，足蹼的等长和异速生长之间发生了多次进化转变。足生长的异速生长参数是最相似的热带物种以前被证明是适应攀登。最后，种间变异的成年足形态显着减少相比，青少年之间的变化，表明个体发育收敛导致了一个共同的成年足形态跨物种。这里提出的结果提供了一个复杂的历史，在这个分支的表型进化的证据。常见的成年表现型之间的物种表明，选择起着重要的作用，在组中的脚的多样性产生的模式。然而，发展轨迹到达这个共同的形态是不同的;与一些物种显示发育停滞（等距），而其他人则表现出增加脚蹼在生长过程中。因此，对于同一个进化挑战，存在多种发展解决方案。我们的研究结果强调了从多个角度研究形态适应的重要性，并强调必须考虑选择性假设和发育过程，以更全面地了解表型进化。
A major goal in evolutionary biology is to understand the evolution of phenotypic diversity. Both natural and sexual selection play a large role in generating phenotypic adaptations, with biomechanical requirements and developmental mechanisms mediating patterns of phenotypic evolution. For many traits, the relative importance of selective and developmental components remains understudied. We investigated ontogenetic trajectories of foot morphology in the eight species of European plethodontid cave salamander to test the hypothesis that adult foot morphology was adapted for climbing. Using geometric morphometrics and other approaches, we found that developmental patterns in five species displayed little morphological change during growth (isometry), where the extensive interdigital webbing in adults was best explained as the retention of the juvenile morphological state. By contrast, three species exhibited significant allometry, with an increase in interdigital webbing during growth. Phylogenetic analyses revealed that multiple evolutionary transitions between isometry and allometry of foot webbing have occurred in this lineage. Allometric parameters of foot growth were most similar to those of a tropical species previously shown to be adapted for climbing. Finally, interspecific variation in adult foot morphology was significantly reduced as compared to variation among juveniles, indicating that ontogenetic convergence had resulted in a common adult foot morphology across species. The results presented here provide evidence of a complex history of phenotypic evolution in this clade. The common adult phenotype exhibited among species reveals that selection plays an important part in generating patterns of foot diversity in the group. However, developmental trajectories arriving at this common morphology are distinct; with some species displaying developmental stasis (isometry), while others show an increase in foot webbing during growth. Thus, multiple developmental solutions exist to the same evolutionary challenge. Our findings underscore the importance of examining morphological adaptations from multiple perspectives, and emphasize that both selective hypotheses and developmental processes must be considered for a more comprehensive understanding of phenotypic evolution.
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DOI：
10.1098/rspb.2007.1169
发表时间：
2008-01-07
影响因子：
4.7
作者：
Drake, Abby Grace;Klingenberg, Christian Peter
通讯作者：
Klingenberg, Christian Peter
影响因子：
3.3
作者：
Adams, Dean C.;Collyer, Michael L.
通讯作者：
Collyer, Michael L.
影响因子：
--
作者：
Adams, DC;Rohlf, FJ;Slice, DE
通讯作者：
Slice, DE
影响因子：
1.6
作者：
Crochet, Pierre-Andre
通讯作者：
Crochet, Pierre-Andre
影响因子：
2.9
作者：
McGuigan, K;Chenoweth, SF;Blows, MW
通讯作者：
Blows, MW