Cytonuclear genetics of experimental fish hybrid zones inside Biosphere 2
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Abstract
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.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Cytonuclear genetics of experimental fish hybrid zones inside Biosphere 2 |
| Series title | PNAS |
| DOI | 10.1073/pnas.91.11.5066 |
| Volume | 91 |
| Issue | 11 |
| Publication Date | May 24, 1994 |
| Year Published | 1994 |
| Language | English |
| Publisher | Proceedings of the National Academy of Sciences of the United States of America |
| Contributing office(s) | Alaska Science Center |
| Description | 4 p. |
| First page | 5066 |
| Last page | 5069 |