Incipient speciation within a subgenus of rockfish (<Emphasis Type="Italic">Sebastosomus</Emphasis>) provides evidence of recent radiations within an ancient species flock |
| |
Authors: | Martha O Burford Giacomo Bernardi |
| |
Institution: | (1) Department of Ecology and Evolutionary Biology, University of California Santa Cruz, 100 Shaffer Road, Santa Cruz, CA 95060, USA;(2) Department of Natural Resources, 208 Fernow Hall, Cornell University, Ithaca, NY 14853, USA |
| |
Abstract: | The high frequency of speciation events associated with species flocks (i.e., radiations of closely related species) provides
invaluable insight into the speciation process. Investigations of the speciation process in the marine environment are rare,
and therefore, the genetic analysis of the rockfish genus Sebastes, considered an ancient marine species flock, provides an opportunity to investigate this process in the sea. Using both mitochondrial
and nuclear markers, we analyzed five closely related species within the rockfish subgenus Sebastosomus. Our goal was to understand the evolutionary history and genetic relationships among species within this group and to provide
evidence of recent speciation events within the subgenus. In the genetic analysis of the subgenus, we found different stages
of the speciation process, with greater genetic divergences among three of the five species, evidence of recent divergence
between two of the five species, Sebastes entomelas and S. mystinus, and significant genetic divergence between two lineages within S. mystinus revealing a signature of incipient speciation. We also found frequency differences of the two S. mystinus lineages among sample locations and found no evidence of introgression between the lineages at the location where both coexist.
Although Sebastes is an example of an ancient species flock, this study provides evidence of ongoing speciation within the genus and reveals
stages of this process from incipient to distinct species. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|