Multifaceted, cross-generational costs of hybridization in sibling Drosophila species.

ABSTRACT: Maladaptive hybridization, as determined by the pattern and intensity of selection against hybrid individuals, is an important factor contributing to the evolution of prezygotic reproductive isolation. To identify the consequences of hybridization between Drosophila pseudoobscura and D. persimilis, we estimated multiple fitness components for F1 hybrids and backcross progeny and used these to compare the relative fitness of parental species and their hybrids across two generations. We document many sources of intrinsic (developmental) and extrinsic (ecological) selection that dramatically increase the fitness costs of hybridization beyond the well-documented F1 male sterility in this model system. Our results indicate that the cost of hybridization accrues over multiple generations and rei

SUBMITTER: Myers EM 

PROVIDER: S-EPMC3827178 | biostudies-literature | 2013

REPOSITORIES: biostudies-literature