Peter Kovalik
Well-known member
Wallace, Sarah J. 2010. Towards a species tree for the Hydrobatinae (Aves: Procellariiformes): phylogenetic evidence for sympatric speciation. QSpace Biology.
Abstract:
The importance of sympatric speciation as a mechanism of species formation has been controversial as it requires divergence with ongoing gene flow. However, populations of two species of storm-petrels, band-rumped (Oceanodroma castro) and Leach’s (O. leucorhoa) storm-petrels, breeding in different seasons on the same island, appear to have originated in sympatry as a result of allochrony (separation by breeding time). We undertook a phylogenetic study of the Hydrobatinae to investigate the importance of sympatric speciation in the history of the storm-petrels. Specifically, we estimated independent gene trees for the mitochondrial cytochrome b gene, and intron 5 of the β-fibrinogen nuclear gene. The cytochrome b gene tree was well resolved, and the β-fibrinogen intron 5 gene tree did not conflict. We found that two sympatric Northwest Pacific species, Matsudaira’s storm-petrel (O. matsudairae; a cool-season breeder) and Swinhoe’s storm-petrels (O. monorhis; a hot-season breeder) were sister species. These species appear to have diverged approximately 3.3 million years ago, and may be the result of sympatric speciation by allochrony. We also found a north-south divergence of three species pairs in the Eastern Pacific Ocean.. SWEP, NSERC
Abstract:
The importance of sympatric speciation as a mechanism of species formation has been controversial as it requires divergence with ongoing gene flow. However, populations of two species of storm-petrels, band-rumped (Oceanodroma castro) and Leach’s (O. leucorhoa) storm-petrels, breeding in different seasons on the same island, appear to have originated in sympatry as a result of allochrony (separation by breeding time). We undertook a phylogenetic study of the Hydrobatinae to investigate the importance of sympatric speciation in the history of the storm-petrels. Specifically, we estimated independent gene trees for the mitochondrial cytochrome b gene, and intron 5 of the β-fibrinogen nuclear gene. The cytochrome b gene tree was well resolved, and the β-fibrinogen intron 5 gene tree did not conflict. We found that two sympatric Northwest Pacific species, Matsudaira’s storm-petrel (O. matsudairae; a cool-season breeder) and Swinhoe’s storm-petrels (O. monorhis; a hot-season breeder) were sister species. These species appear to have diverged approximately 3.3 million years ago, and may be the result of sympatric speciation by allochrony. We also found a north-south divergence of three species pairs in the Eastern Pacific Ocean.. SWEP, NSERC
