Literaturdatenbank
Literaturdatenbank |
|
 |
|
Stephens, P. R., & Wiens, J. J. (2009). Evolution of sexual size dimorphisms in emydid turtles: ecological dimorphism, rensch's rule, and sympatric divergence. Evolution, (epub. ahead of print).
Added by: Admin (22 Feb 2009 11:56:34 UTC) |
| Resource type: Journal Article BibTeX citation key: Stephens2009 View all bibliographic details  |
Categories: General Keywords: Morphologie = morphology, Schildkröten = turtles + tortoises, Systematik = taxonomy Creators: Stephens, Wiens Collection: Evolution |
Views: 4/505
Views index: 9% Popularity index: 2.25% |
| Abstract |
|
Emydidae The origin of sexual size dimorphisms (SSD) has long been a central topic in evolutionary biology. However, there is little agreement as to which factors are most important in driving the evolution of SSD, and several hypotheses concerning SSD evolution have never been tested empirically. Emydid turtles include species with both male and female-biased SSD, and some emydids exhibit among the most extreme SSD in tetrapods. Here, we use a comparative phylogenetic approach in emydids to analyze the origins of SSD and test several hypotheses for the evolution of SSD, some for the first time. We test the Fairbairn-Preziosi hypothesis for the origin of Rensch's rule, and support it in lineages with male-biased SSD but not those with female-biased SSD. We also find support for the secondary ecological dimorphism hypothesis, which proposes that selection for ecological divergence between sexes exaggerates preexisting SSD. Finally, we find only equivocal support for the Bolnick-Doebeli hypothesis, which relates intersexual ecological divergence to interspecific ecological divergence. Our results also illustrate how global analyses of SSD may mislead in groups in which the factors that drive the evolution of SSD vary among clades.
Added by: Admin |