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Evolutionary genetics of Death Valley pupfish populations: mitochondrial DNA sequence variation and population structure

Evolutionary genetics of Death Valley pupfish populations: mitochondrial DNA sequence variation... The pupfishes of Death Valley (genus: Cyprinodon) are a classic example of rapid (post- Pleistocene) allopatric divergence with several populations exhibiting striking morpho- logical, physiological, and behavioural differences. However, genetic changes accompanying or causing this divergence have been poorly resolved and/or difficult to detect. In order to investigate the phylogeography of the system and infer historical effec- tive population sizes, mtDNA sequence variation was assessed within and among popu- lations. In total, mtDNA D-loop sequences revealed 11 haplotypes among 278 individuals from 16 populations. Genetic diversity within populations was generally low (1–3 haplo- types per population) suggesting relatively small effective population sizes. Most variation occurred among populations, resulting in extensive genetic structure. The genealogical relationships of mtDNA haplotypes were determined by a combined phylo- genetic analysis of both D-loop and ND2 sequences. These relationships revealed that the present distribution of haplotypes in Death Valley has probably resulted from stochastic, and in some cases, incomplete sorting of ancestral variation. The presence of highly diver- gent haplotypes in some populations may indicate that ancestral population sizes were substantially larger, perhaps rivalling population sizes observed in contemporary coastal pupfish species. In contrast, other Death Valley populations of equal contemporary size appeared monomorphic http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Molecular Ecology Wiley

Evolutionary genetics of Death Valley pupfish populations: mitochondrial DNA sequence variation and population structure

Molecular Ecology , Volume 7 (3) – Mar 1, 1998

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References (46)

Publisher
Wiley
Copyright
Copyright © 1998 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0962-1083
eISSN
1365-294X
DOI
10.1046/j.1365-294X.1998.00347.x
Publisher site
See Article on Publisher Site

Abstract

The pupfishes of Death Valley (genus: Cyprinodon) are a classic example of rapid (post- Pleistocene) allopatric divergence with several populations exhibiting striking morpho- logical, physiological, and behavioural differences. However, genetic changes accompanying or causing this divergence have been poorly resolved and/or difficult to detect. In order to investigate the phylogeography of the system and infer historical effec- tive population sizes, mtDNA sequence variation was assessed within and among popu- lations. In total, mtDNA D-loop sequences revealed 11 haplotypes among 278 individuals from 16 populations. Genetic diversity within populations was generally low (1–3 haplo- types per population) suggesting relatively small effective population sizes. Most variation occurred among populations, resulting in extensive genetic structure. The genealogical relationships of mtDNA haplotypes were determined by a combined phylo- genetic analysis of both D-loop and ND2 sequences. These relationships revealed that the present distribution of haplotypes in Death Valley has probably resulted from stochastic, and in some cases, incomplete sorting of ancestral variation. The presence of highly diver- gent haplotypes in some populations may indicate that ancestral population sizes were substantially larger, perhaps rivalling population sizes observed in contemporary coastal pupfish species. In contrast, other Death Valley populations of equal contemporary size appeared monomorphic

Journal

Molecular EcologyWiley

Published: Mar 1, 1998

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