A multi-locus assessment of connectivity and historical demography in the bluehead wrasse ( )

The pelagic larval stage of most coral reef fishes might allow extensive dispersal or, alternatively, some level of local recruitment might be important. Molecular markers can be used to obtain indirect estimates of dispersal to evaluate these alternatives, yet the extent of gene flow among populati...

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Bibliographic Details
Published in:Heredity 2007-05, Vol.98 (5), p.294-302
Main Authors: Haney, R A, Silliman, B R, Rand, D M
Format: Article
Language:English
Subjects:
Animal Migration
Animals
Biomedical and Life Sciences
Biomedicine
Coral reefs
Cytogenetics
Demography
Dispersal
DNA, Mitochondrial - genetics
Ecology
Evolution, Molecular
Evolutionary Biology
Fish
Gene flow
Genetic diversity
Genetics
Genetics, Population
Genotype
Geography
Heredity
Human Genetics
Larva - genetics
Larva - physiology
Marine
Microsatellite Repeats
Mitochondrial DNA
original-article
Perciformes - genetics
Perciformes - physiology
Plant Genetics and Genomics
Polymerase Chain Reaction
Polymorphism, Genetic
Polymorphism, Restriction Fragment Length
Population Dynamics
Population number
Sequence Analysis, DNA
Thalassoma bifasciatum
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Summary:The pelagic larval stage of most coral reef fishes might allow extensive dispersal or, alternatively, some level of local recruitment might be important. Molecular markers can be used to obtain indirect estimates of dispersal to evaluate these alternatives, yet the extent of gene flow among populations is known for only a small number of species. The use of such markers must take into account the properties of the markers and the demographic history of the population when making inferences about current gene flow. In the Caribbean bluehead wrasse, Thalassoma bifasciatum , previous studies have found both substantial levels of local recruitment, in studies interpreting otolith microchemistry and, conversely, a lack of genetic differentiation inferred from mitochondrial DNA (mtDNA) restriction-fragment length polymorphism (RFLP) data and allozymes. However, if subtle differentiation exists, larger sample sizes and highly variable markers may be required to discern it. Here we present results from mitochondrial control region sequence and microsatellite data that indicate a lack of genetic differentiation at both small and large spatial scales. However, historical processes, such as changes in population size, may have affected the current distribution of genetic variation.
ISSN:0018-067X
1365-2540
DOI:10.1038/sj.hdy.6800940