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Last update: Thursday, 13-Mar-2014 12:30:28 EDT

Correlated divergence in functionally coupled and rapidly evolving traits

Support: National Science Foundation (Doctoral Dissertation Improvement Grant IOS 0407570)

     In collaboration with L. Lacey Knowles, we studied the dimensionality of correlated divergence between functionally coupled traits. Specifically, we asked how functional integration affects the trajectory of divergence of rapidly-evolving traits when both the intraspecific variation and the phylogenetic disparity of these traits span a large number of dimensions. For this work, we compared patterns of disparity of genitalic traits from male grasshoppers of the genus Melanoplus, a set of rapidly diverging structures whose evolutionary dynamics is most likely driven by sexual selection. Results from two clades of this genus suggest that co-divergence of most tightly coupled mating traits has a remarkably low dimensionality (i.e. multiple traits seem to diverge along nearly linear and highly correlated trajectories), despite the enormous disparity shown by these phenotypes in both clades.
     Our study suggests that the dimensionality of individual traits does not necessarily predict the dimensionality of the direction in which they diverge. Evolutionary associations among multivariate traits do not necessarily span the full set of dimensions of any of these traits, making it valuable to distinguish among the dimensions of a trait that do co-diverge with other traits from those that evolve independently.

Márquez, E.J.; Knowles, L.L. 2007. Correlated evolution of multivariate traits: detecting co-divergence across multiple dimensions. Journal of Evolutionary Biology 20:2334-2348.  [ PUBMED ][ PDF ]
Márquez, E.J. 2007. Software CORIANDIS: Correlation analysis based on distances. University of Michigan, Ann Arbor. [ DOWNLOAD Win32 Win64 ]
Ontogeny of symmetric and FA variation
Coevolutionary trajectory in multivariate shape space of genitalic traits in a clade of grasshoppers.

Present and Past Projects A dictionary of genetic effects The statistical power of multivariate GWAS A GWAS of wing shape in Drosophila melanogaster Shape as a function Geometric representation of modularity Modularity and integration in the mouse skull Correlated divergence of functionally coupled traits Dimensionality and coevolution of mating traits under antagonistic selection Earlier projects

© 2003-2014 Eladio J. Márquez