Phylogeny and anatomy of marine mussels (Bivalvia: Mytilidae) reveal convergent evolution of siphon traits
Phylogeny and anatomy of marine mussels (Bivalvia: Mytilidae) reveal convergent evolution of siphon traits
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DOI：
10.1093/zoolinnean/zlaa011
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发表时间：
2020-10-01
影响因子：
2.8
通讯作者：
Marian, Jose Eduardo A. R.
中科院分区：
文献类型：
--
作者：
Audino, Jorge A.;Serb, Jeanne M.;Marian, Jose Eduardo A. R.
收敛形态是适应性特征的一个强有力的标志。海洋贻贝（贻贝科）长期以来一直因其生态和经济重要性而受到研究。然而，生活方式和表型的变化也使它们成为重点研究生态形态相关性和适应性的合适模型。本研究探讨地幔边缘多样性和生态过渡的贻贝，以确定宏观进化模式和趋同进化的测试。基于19属33种贻贝的5个基因，提出了一个化石校正的系统发育假说。本文对25属43个保存种的地幔边缘形态变异进行了研究，并对4个重点种进行了详细解剖。通过祖先状态估计和相关性检验研究性状进化。我们的进化史恢复了两个主要的分支来自表生动物的祖先。随后，不同的谱系逐渐转向其他生活方式：半底栖或钻入坚硬的基底。这种转变与后地幔区长虹吸管的发育有关。两个独立的起源重建后小叶的内褶，这是与激烈的粘液纤毛运输，这表明一个重要的清洁作用，在表观动物贻贝。我们的研究结果揭示了与海洋贻贝生活方式转变相关的趋同形态进化的新例子。
Convergent morphology is a strong indication of an adaptive trait. Marine mussels (Mytilidae) have long been studied for their ecology and economic importance. However, variation in lifestyle and phenotype also make them suitable models for studies focused on ecomorphological correlation and adaptation. The present study investigates mantle margin diversity and ecological transitions in the Mytilidae to identify macroevolutionary patterns and test for convergent evolution. A fossil-calibrated phylogenetic hypothesis of Mytilidae is inferred based on five genes for 33 species (19 genera). Morphological variation in the mantle margin is examined in 43 preserved species (25 genera) and four focal species are examined for detailed anatomy. Trait evolution is investigated by ancestral state estimation and correlation tests. Our phylogeny recovers two main clades derived from an epifaunal ancestor. Subsequently, different lineages convergently shifted to other lifestyles: semi-infaunal or boring into hard substrate. Such transitions are correlated with the development of long siphons in the posterior mantle region. Two independent origins are reconstructed for the posterior lobules on the inner fold, which are associated with intense mucociliary transport, suggesting an important cleansing role in epifaunal mussels. Our results reveal new examples of convergent morphological evolution associated with lifestyle transitions in marine mussels.