info:eu-repo/semantics/article
Differential Rates of Male Genital Evolution in Sibling Species of Drosophila
Fecha
2018-06Registro en:
Stefanini, Manuel Ignacio; Milla Carmona, Pablo Sebastián; Iglesias, Patricia Paola; Soto, Eduardo Maria; Soto, Ignacio Maria; Differential Rates of Male Genital Evolution in Sibling Species of Drosophila; Springer; Evolutionary Biology; 45; 2; 6-2018; 211-222
0071-3260
CONICET Digital
CONICET
Autor
Stefanini, Manuel Ignacio
Milla Carmona, Pablo Sebastián
Iglesias, Patricia Paola
Soto, Eduardo Maria
Soto, Ignacio Maria
Resumen
Genital morphology in animals with internal fertilization is considered to be among the fastest evolving traits. Sexual selection is often proposed as the main driver of genital diversification but the exact selection mechanisms involved are usually unclear. In addition, the mechanisms operating may differ even between pairs of sibling species. We investigated patterns of male genital variation within and between natural populations of the cactophilic fly Drosophila koepferae ranging its entire geographic distribution and compared them with those previously observed in its sibling species, D. buzzatii. Using both mtDNA and nDNA markers we found that genital shape variation in D. koepferae is more restricted than expected for neutral evolution, suggesting the predominance of stabilizing selection. We also detected dissimilar patterns of divergence between populations of D. koepferae that were allopatric and sympatric with D. buzzatii. The constrained evolution inferred for D. koepferae’s genitalia clearly contrasts with the rapid divergence and higher morphological disparity observed in the populations of D. buzzatii. Finally, different possible scenarios of male genital evolution in each species and within the radiation of D. buzzatii cluster are discussed.