Convergent and parallel evolution in life habit of the scallops (Bivalvia: Pectinidae)

BMC Evolutionary Biology

Research Article

Jeanne M Serb¹  Alvin Alejandrino¹  Louise Puslednik² 

[1] Department of Ecology, Evolution, and Organismal Biology, Iowa State University, 50011, Ames, Iowa, USA;Department of Ecology, Evolution, and Organismal Biology, Iowa State University, 50011, Ames, Iowa, USA;Institute for Conservation Biology and Environmental Management, School of Biological Sciences, University of Wollongong, 2519, New South Wales, Australia;

关键词: Ancestral State;    Shell Morphology;    Life Habit;    Early Cretaceous Period;    Parallel Trajectory;   

DOI  :  10.1186/1471-2148-11-164

 received in 2010-12-12, accepted in 2011-06-14,  发布年份 2011

来源: Springer

【 摘 要 】

BackgroundWe employed a phylogenetic framework to identify patterns of life habit evolution in the marine bivalve family Pectinidae. Specifically, we examined the number of independent origins of each life habit and distinguished between convergent and parallel trajectories of life habit evolution using ancestral state estimation. We also investigated whether ancestral character states influence the frequency or type of evolutionary trajectories.ResultsWe determined that temporary attachment to substrata by byssal threads is the most likely ancestral condition for the Pectinidae, with subsequent transitions to the five remaining habit types. Nearly all transitions between life habit classes were repeated in our phylogeny and the majority of these transitions were the result of parallel evolution from byssate ancestors. Convergent evolution also occurred within the Pectinidae and produced two additional gliding clades and two recessing lineages. Furthermore, our analysis indicates that byssal attaching gave rise to significantly more of the transitions than any other life habit and that the cementing and nestling classes are only represented as evolutionary outcomes in our phylogeny, never as progenitor states.ConclusionsCollectively, our results illustrate that both convergence and parallelism generated repeated life habit states in the scallops. Bias in the types of habit transitions observed may indicate constraints due to physical or ontogenetic limitations of particular phenotypes.

【 授权许可】

Unknown   
© Alejandrino et al; licensee BioMed Central Ltd. 2011. This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.