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Consequences of inter‐population crosses on developmental stability and canalization of floral traits in Dalechampia scandens (Euphorbiaceae)
Author(s) -
Pélabon C.,
Carlson M. L.,
Hansen T. F.,
Yoccoz N. G.,
Armbruster W. S.
Publication year - 2004
Publication title -
journal of evolutionary biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.289
H-Index - 128
eISSN - 1420-9101
pISSN - 1010-061X
DOI - 10.1046/j.1420-9101.2003.00663.x
Subject(s) - biology , hybrid , fluctuating asymmetry , trait , population , evolutionary biology , genetics , genetic variation , botany , gene , demography , sociology , computer science , programming language
Congruence between changes in phenotypic variance and developmental noise in inter‐population hybrids was analysed to test whether environmental canalization and developmental stability were controlled by common genetic mechanisms. Developmental stability assessed by the level of fluctuating asymmetry (FA), and canalization by the within‐ and among‐individual variance, were measured on several floral traits of Dalechampia scandens (Euphorbiaceae). Hybridization affected canalization. Both within‐ and among‐individual phenotypic variance decreased in hybrids from populations of intermediate genetic distance, and strongly increased in hybrids from genetically distant populations. Mean‐trait FA differed among cross‐types, but hybrids were not consistently more or less asymmetric than parental lines across traits. We found no congruence between changes in FA and changes in phenotypic variance. These results suggest that developmental stability (measured by FA) and canalization are independently controlled. This study also confirms the weak relationship between FA and the breakdown of coadapted gene complexes following inter‐population hybridization.

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