Evolutionary parallelisms of pectoral and pelvic network-anatomy from fins to limbs
Evolutionary parallelisms of pectoral and pelvic network-anatomy from fins to limbs
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DOI：
10.1126/sciadv.aau7459
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发表时间：
2019-05-01
期刊：
影响因子：
13.6
通讯作者：
Hutchinson, John R.
中科院分区：
文献类型：
--
作者：
Esteve-Altava, Borja;Pierce, Stephanie E.;Hutchinson, John R.
在泥盆纪时期，叶鳍变成了四肢，促进了四足动物从水到陆地的过渡。我们追踪了关节连接良好的骨骼在鳍到四肢过渡的演变，使用基于网络的方法来量化和比较鳍和四肢的拓扑特征。我们发现，胸鳍和骨盆附属器的骨骼的拓扑结构在鳍到四肢的过渡过程中平行演变，占据重叠区域的形态空间，遵循方向性的趋势，并随着时间的推移减少其差距。我们确定存在的数字作为形态新奇触发拓扑变化，区分四肢鳍。足趾的起源导致了一个进化的转变，即附属物的连接不那么密集和不均匀，但更具有连续性和模块性。两种附肢的差异同样减少，直到与最早的已知四足动物足迹相伴的时候才更加明显。最后，我们拒绝了胸骨盆相似性瓶颈的存在，在四足动物的起源。
Lobe-fins transformed into limbs during the Devonian period, facilitating the water-to-land transition in tetrapods. We traced the evolution of well-articulated skeletons across the fins-to-limbs transition, using a network-based approach to quantify and compare topological features of fins and limbs. We show that the topological arrangement of bones in pectoral and pelvic appendages evolved in parallel during the fins-to-limbs transition, occupying overlapping regions of the morphospace, following a directional trend, and decreasing their disparity over time. We identify the presence of digits as the morphological novelty triggering topological changes that discriminated limbs from fins. The origin of digits caused an evolutionary shift toward appendages that were less densely and heterogeneously connected, but more assortative and modular. Disparity likewise decreased for both appendages, more markedly until a time concomitant with the earliest-known tetrapod tracks. Last, we rejected the presence of a pectoral-pelvic similarity bottleneck at the origin of tetrapods.