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Isolation and differentiation of Rivulus hartii across Trinidad and neighboring islands.
MedLine Citation:
PMID:  21199028     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
Diversification of freshwater fishes on islands is considered unlikely because the traits that enable successful colonization-specifically, broad salinity tolerances and the potential for oceanic dispersal-may also constrain post-colonization genetic differentiation. Some secondary freshwater fish, however, exhibit pronounced genetic differentiation and geographic structure on islands, whereas others do not. It is unclear what conditions give rise to contrasting patterns of differentiation because few comparative reconstructions of population history have been carried out for insular freshwater fishes. In this study, we examined the phylogeography of Hart's killifish (Rivulus hartii) across Trinidad, with reference to neighboring islands and northern South America, to test hypotheses of colonization and differentiation derived from comparable work on co-occurring guppies (Poecilia reticulata). Geographic patterns of mitochondrial DNA haplotype variation and microsatellite genotype variation provide evidence of genetic differentiation of R. hartii among islands and across Trinidad. Our findings are largely consistent with patterns of geographically structured ancestry and admixture found in Trinidadian guppies, which suggests that both species share a history of colonization and differentiation and that post-colonization diversification may be more common among members of insular freshwater fish assemblages than has been previously thought.
Authors:
Ryan P Walter; Michael J Blum; Sunny B Snider; Ian G Paterson; Paul Bentzen; Brad A Lamphere; James F Gilliam
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Publication Detail:
Type:  Journal Article     Date:  2010-12-29
Journal Detail:
Title:  Molecular ecology     Volume:  20     ISSN:  1365-294X     ISO Abbreviation:  Mol. Ecol.     Publication Date:  2011 Feb 
Date Detail:
Created Date:  2011-01-18     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9214478     Medline TA:  Mol Ecol     Country:  England    
Other Details:
Languages:  eng     Pagination:  601-18     Citation Subset:  IM    
Copyright Information:
© 2010 Blackwell Publishing Ltd.
Affiliation:
Department of Ecology and Evolutionary Biology, Tulane University, New Orleans, LA 70118, USA Department of Biology, North Carolina State University, Raleigh, NC 27695-7617, USA Department of Biology, Dalhousie University, Halifax, Nova Scotia, Canada B3H 4J1.
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