Ark clams and relatives (Bivalvia: Arcida) show convergent morphological evolution associated with lifestyle transitions in the marine benthos

Ark clams and relatives (Bivalvia: Arcida) show convergent morphological evolution associated with lifestyle transitions in the marine benthos
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方舟蛤及其近亲(双壳纲:Arcida)表现出与海洋底栖生活方式转变相关的趋同形态进化

DOI:
10.1093/biolinnean/blz017
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发表时间:
2019
影响因子:
1.9
通讯作者:
Marian, José Eduardo
Marian, José Eduardo
中科院分区:
生物学2区
文献类型:
--
作者:
Audino, Jorge A;Serb, Jeanne M;Marian, José Eduardo

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宏观进化研究中最令人感兴趣的难题之一是了解亲缘关系远的类群如何在相似的生态条件下进化到相似的表型。方舟及其近亲(Arcida)具有两种主要的生态系统,即表生动物和底生动物。他们的地幔边缘包括功能,如感光和肌肉器官,这可能符合每个习惯,使这些双壳类动物的一个合适的模型,以探讨海洋底栖生物的进化趋同。为了测试生活方式和形态之间的进化关联,我们收集了所有六个现存的arcidan家族的64个物种的地幔边缘的数据。根据来自54个种的4个基因序列推断了Arcida的分子系统学,并用于研究其性状进化。我们的研究结果支持这一假设,即感光器器官有一个单一的起源和动物群的谱系失去了这些结构在独立的事件,这表明了相关的进化模式。此外,扩大后内褶皱,这是一个功能性的虹吸管,有利于发生收敛过渡到动物群的习惯在中生代。我们提供的证据表明,生态形态协会和假定的适应性在一个双壳类分支,揭示了驱动海洋底栖生物进化的根本因素。
One of the most intriguing puzzles in macroevolutionary studies is to understand how distantly related taxa can evolve towards similar phenotypes in response to similar ecological conditions. Ark clams and their relatives (Arcida) display two main ecologies represented by epifaunal and infaunal lifestyles. Their mantle margin includes features, such as photosensory and muscular organs, that may coincide with each habit, making these bivalves a suitable model to explore evolutionary convergence in the marine benthos. To test for the evolutionary association between lifestyles and morphology, we gathered data on the mantle margin for 64 species across all six extant arcidan families. A molecular phylogeny of Arcida was inferred based on four gene sequences from 54 species and used to study trait evolution. Our results support the hypothesis that photoreceptor organs had a single origin and that infaunal lineages lost these structures in independent events, suggesting a correlated pattern of evolution. In addition, the enlargement of the posterior inner fold, which acts as a functional siphon, favoured the occurrence of convergent transitions to infaunal habits during the Mesozoic. We provide evidence of ecomorphological associations and putative adaptations in a bivalve clade that sheds light on the underlying factors driving evolution of the marine benthos.
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发表时间: 2017
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DOI: --
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发表时间: 1950
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发表时间: 2015
期刊: PLoS ONE
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