Evolutionary modularity, integration and disparity in an accretionary skeleton: analysis of venerid Bivalvia
Evolutionary modularity, integration and disparity in an accretionary skeleton: analysis of venerid Bivalvia
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DOI：
10.1098/rspb.2021.1199
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发表时间：
2022-01-26
影响因子：
4.7
通讯作者：
Jablonski, David
中科院分区：
文献类型：
--
作者：
Edie, Stewart M.;Khouja, Safia C.;Jablonski, David
模块化进化，即身体各部分相对独立的进化，可能会促进一个分支中较高的形态差异。相反，通过更强的部分协变进行的综合进化可能会限制差异。然而，融合也可以通过沿着阻力最小的路线引导形态进化来促进高度差异--这一过程可能在许多具有增长性增长的无脊椎动物系统中积累差异方面特别重要。我们使用时间校准的系统发育假说和高密度、三维的半陆地标记来分析现存最多样化的双壳类家族：双壳贝科的模块化、整体性和差异性之间的关系。一般来说，性病动物的身体有一个简单的两个模块的部分，分为碳酸钙外壳的特征和内部软解剖的特征。放在双壳类解剖学和生物力学的背景下，这种划分更多地是沿着发育线而不是功能线进行的。从绝对值上讲，兽体是紧密结合的，但差异似乎随着亚纲和生态系统之间的模块化强度而增加。因此，向更多的镶嵌进化转变导致在这个物种家族中产生更高的形态变异。
Modular evolution, the relatively independent evolution of body parts, may promote high morphological disparity in a clade. Conversely, integrated evolution via stronger covariation of parts may limit disparity. However, integration can also promote high disparity by channelling morphological evolution along lines of least resistance-a process that may be particularly important in the accumulation of disparity in the many invertebrate systems having accretionary growth. We use a time-calibrated phylogenetic hypothesis and high-density, three-dimensional semilandmarking to analyse the relationship between modularity, integration and disparity in the most diverse extant bivalve family: the Veneridae. In general, venerids have a simple, two-module parcellation of their body that is divided into features of the calcium carbonate shell and features of the internal soft anatomy. This division falls more along developmental than functional lines when placed in the context of bivalve anatomy and biomechanics. The venerid body is tightly integrated in absolute terms, but disparity appears to increase with modularity strength among subclades and ecologies. Thus, shifts towards more mosaic evolution beget higher morphological variance in this speciose family.