Nonallopatric and parallel origin of local reproductive barriers between two snail ecotypes.

@article{RolnAlvarez2004NonallopatricAP,
  title={Nonallopatric and parallel origin of local reproductive barriers between two snail ecotypes.},
  author={Emilio Rol{\'a}n-Alvarez and M{\'o}nica Carballo and Juan Galindo and P Mor{\'a}n and Blanca Silva Fern{\'a}ndez and Armando Caballero and Raquel Vera Cruz and Elizabeth Grace Boulding and Kerstin Johannesson},
  journal={Molecular ecology},
  year={2004},
  volume={13 11},
  pages={3415-24}
}
Theory suggests that speciation is possible without physical isolation of populations (hereafter, nonallopatric speciation), but recent nonallopatric models need the support of irrefutable empirical examples. We collected snails (Littorina saxatilis) from three areas on the NW coast of Spain to investigate the population genetic structure of two ecotypes. Earlier studies suggest that these ecotypes may represent incipient species: a large, thick-shelled 'RB' ecotype living among the barnacles… CONTINUE READING