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A modified stepping-stone model of population structure in red drum, Sciaenops ocellatus (Sciaenidae), from the northern Gulf of Mexico
Citation
Gold, JR and Burridge, CP and Turner, TF, A modified stepping-stone model of population structure in red drum, Sciaenops ocellatus (Sciaenidae), from the northern Gulf of Mexico, Genetica, 111 pp. 305-317. ISSN 0016-6707 (2001) [Refereed Article]
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Copyright Statement
The original publication is available at www.springerlink.com - Copyright © 2001 Kluwer Academic Publishers.
Official URL: http:// www.springerlink.com
DOI: doi:10.1023/A:1013705230346
Abstract
Genetic studies of population or ‘stock’ structure in exploited marine fishes typically are designed to determine
whether geographic boundaries useful for conservation and management planning are identifiable. Implicit in many
such studies is the notion that subpopulations or stocks, if they exist, have fixed territories with little or no gene
exchange between them. Herein, we review our long-term genetic studies of red drum (Sciaenops ocellatus), an
estuarine-dependent sciaenid fish in the Gulf of Mexico and western Atlantic Ocean. Significant differences in
frequencies of mitochondrial DNA haplotypes and of alleles at nuclear-encoded microsatellites occur among red
drum sampled across the northern Gulf of Mexico. The spatial distribution of the genetic variation, however,
follows a pattern of isolation-by-distance consistent with the hypothesis that gene flow occurs among subpopu-
lations and is an inverse (and continuous) function of geographic distance. However, successful reproduction and
recruitment of red drum depend on estuarine habitats that have geographically discrete boundaries. We hypothesize
that population structure in red drum follows a modified one-dimensional, linear stepping-stone model where gene
exchange occurs primarily (but not exclusively) between adjacent bays and estuaries distributed linearly along
the coastline. Gene flow does occur among estuaries that are not adjacent but probabilities of gene exchange
decrease as a function of geographic distance. Implications of our hypothesis are discussed in terms of inferences
drawn from patterns of isolation-by-distance and relative to conservation and management of estuarine-dependent
species like red drum. Based on estimates of the ratio of genetic effective population size and census size in red
drum, observed patterns of gene flow in red drum may play a significant role in recruitment.
Item Details
Item Type: | Refereed Article |
---|---|
Research Division: | Biological Sciences |
Research Group: | Genetics |
Research Field: | Genetics not elsewhere classified |
Objective Division: | Environmental Management |
Objective Group: | Marine systems and management |
Objective Field: | Marine biodiversity |
UTAS Author: | Burridge, CP (Associate Professor Christopher Burridge) |
ID Code: | 59470 |
Year Published: | 2001 |
Web of Science® Times Cited: | 45 |
Deposited By: | Zoology |
Deposited On: | 2009-12-02 |
Last Modified: | 2018-06-29 |
Downloads: | 1 View Download Statistics |
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