Patterns of Phenotypic Divergence in Wing Covariance Structure of Calopterygid Damselflies |
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Authors: | Fabrice Eroukhmanoff David Outomuro Francisco J Ocharan Erik I Svensson |
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Institution: | (1) Section for Animal Ecology, Ecology Building, Lund University, 223 62 Lund, Sweden;(2) Departamento de Biología de Organismos y Sistemas, Oviedo University, 33071 Oviedo, Spain |
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Abstract: | Comparing species differences in covariance patterns of traits subject to divergent selection pressures can increase our understanding
to the mechanisms of phenotypic divergence. Different species of calopterygid damselflies have diverged in the melanized wing
patch of males. This trait serves multiple ecological functions and has behavioral consequences in terms of sexual selection,
interspecific interactions, reproductive isolation. We compared the phenotypic variance-covariance matrices (P) of wing traits among nine populations of four European species of calopterygid damselflies. We found modest divergence in
covariance structure among populations of the same species, but strong divergence between species. Interestingly, the orientation
of the first eigenvector of P (P
max
) differed more between closely related species than between distantly related species, although this pattern was absent when
overall covariance structures were compared. We also found that distantly related species but geographically closer had converged
towards a similar covariance structure. Finally, divergence in covariance structure was correlated with divergence in wing
patch length, but not with other wing traits. This last finding suggests that divergent selection on wing patch length might
have affected the stability of P. These results indicate that P might not only reflect ancestral developmental pathways but might also be influenced by current ecology. |
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Keywords: | Phenotypic integration Phenotypic plasticity P-matrix Speciation Wing morphology |
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