Document Detail

Roles for modularity and constraint in the evolution of cranial diversity among anolis lizards.
MedLine Citation:
PMID:  22519788     Owner:  NLM     Status:  In-Data-Review    
Complex organismal structures are organized into modules, suites of traits that develop, function, and vary in a coordinated fashion. By limiting or directing covariation among component traits, modules are expected to represent evolutionary building blocks and to play an important role in morphological diversification. But how stable are patterns of modularity over macroevolutionary timescales? Comparative analyses are needed to address the macroevolutionary effect of modularity, but to date few have been conducted. We describe patterns of skull diversity and modularity in Caribbean Anolis lizards. We first diagnose the primary axes of variation in skull shape and then examine whether diversification of skull shape is concentrated to changes within modules or whether changes arose across the structure as a whole. We find no support for the hypothesis that cranial modules are conserved as species diversify in overall skull shape. Instead we find that anole skull shape and modularity patterns independently converge. In anoles, skull modularity is evolutionarily labile and may reflect the functional demands of unique skull shapes. Our results suggest that constraints have played little role in limiting or directing the diversification of head shape in Anolis lizards.
Thomas J Sanger; D Luke Mahler; Arhat Abzhanov; Jonathan B Losos
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Publication Detail:
Type:  Journal Article     Date:  2011-12-29
Journal Detail:
Title:  Evolution; international journal of organic evolution     Volume:  66     ISSN:  1558-5646     ISO Abbreviation:  Evolution     Publication Date:  2012 May 
Date Detail:
Created Date:  2012-04-23     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0373224     Medline TA:  Evolution     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1525-42     Citation Subset:  IM    
Copyright Information:
© 2011 The Author(s). Evolution© 2011 The Society for the Study of Evolution.
Museum of Comparative Zoology, Harvard University, 26 Oxford Street, Cambridge, Massachusetts 02138 Department of Organismic and Evolutionary Biology, Harvard University, 16 Divinity Avenue, Cambridge, Massachusetts 02138 E-mail: These authors contributed equally to the preparation of this manuscript.
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