Cytonuclear genetics of experimental fish hybrid zones inside Biosphere 2.
AUTOR(ES)
Scribner, K T
RESUMO
Two species of mosquitofish (family Poeciliidae) known to hybridize in nature were introduced into freshwater habitats inside Biosphere 2, and their population genetics were monitored after 2 years. Within four to six generations, nuclear and cytoplasmic markers characteristic of Gambusia holbrooki had risen greatly in frequency, although some Gambusia affinis alleles and haplotypes were retained primarily in recombinant genotypes, indicative of introgressive hybridization. The temporal cytonuclear dynamics proved similar to population genetic changes observed in replicated experimental hybrid populations outside of Biosphere 2, thus indicating strong directional selection favoring G. holbrooki genotypes across the range of environments monitored. When interpreted in the context of species-specific population demographies observed previously, results suggest that the extremely rapid evolution in these zones of secondary contact is attributable primarily to species differences in life-history traits.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=43932Documentos Relacionados
- The Effects of Assortative Mating and Migration on Cytonuclear Associations in Hybrid Zones
- An epistatic mating system model can produce permanent cytonuclear disequilibria in a hybrid zone.
- Medical genetics: 2. The diagnostic approach to the child with dysmorphic signs
- Genetics 101: cytogenetics and FISH
- Genetics of the Siamese Fighting Fish, Betta Splendens
