Skip to main content
WCS
Menu
Library
Library Catalog
eJournals & eBooks
WCS Research
Archives
Research Use
Finding Aids
Digital Collections
WCS History
WCS Research
Research Publications
Science Data
Services for WCS Researchers
Archives Shop
Bronx Zoo
Department of Tropical Research
Browse By Product
About Us
FAQs
Intern or Volunteer
Staff
Donate
Search WCS.org
Search
search
Popular Search Terms
WCS History
Library and Archives
Library and Archives Menu
Library
Archives
WCS Research
Archives Shop
About Us
Donate
en
fr
Title
Population genetic structure across dissolved oxygen regimes in an African cichlid fish
Author(s)
Crispo, E.; Chapman, L.J.
Published
2008
Publisher
Molecular Ecology
Published Version DOI
https://doi.org/10.1111/j.1365-294X.2008.03729.x
Abstract
Ecological isolation is a process whereby gene flow between selective environments is reduced due to selection against maladapted dispersers, migrant alleles, or hybrids. Although ecological isolation has been documented in several systems, gene flow can often be high among selective regimes, and more studies are thus needed to better understand the conditions under which ecological gradients or divergent selective regimes should influence population structure. We test for ecological isolation in a system in which high plasticity occurs with respect to traits that are adaptive in alternate forms under different environmental conditions. Pseudocrenilabrus multicolor victoriae is a widespread haplochromine cichlid fish in East Africa that exploits both normoxic (normal oxygen) rivers/lakes and hypoxic (low oxygen) swamps. Here, we examine population structure, using mitochondrial DNA and microsatellites, to determine if genetic divergence is significantly increased between dissolved oxygen regimes relative to within them, while controlling for geographical structure. Our results indicate that geographical separation influences population structure, while no effects of divergent selection with respect to oxygen regimes were detected. Specifically, we document (i) genetic clustering according to geographical region, but no clustering according to oxygen regime; (ii) higher genetic variation among than within regions, but no effect of oxygen regime on genetic variation; (iii) isolation by distance within one region; and (iv) decreasing genetic variability with increasing geographical distance from Lake Victoria. We speculate that plasticity may be facilitating gene flow between oxygen regimes in this system. © 2008 The Authors.
Keywords
microsatellite DNA; mitochondrial DNA; oxygen; animal; article; cichlid; computer program; environment; gene flow; genetic variability; genetics; haplotype; metabolism; molecular evolution; population dynamics; solubility; Uganda; Animals; Cichlids; DNA, Mitochondrial; Evolution, Molecular; Haplotypes; Microsatellite Repeats; Software; Variation (Genetics); African cichlids; Cichlidae; Pseudocrenilabrus multicolor victoriae; Divergent natural selection; Ecological isolation; Ecological speciation; Hypoxia; Isolation by distance; Phenotypic plasticity
Access Full Text
A full-text copy of this article may be available. Please email the
WCS Library
to request.
Back
PUB10588