Temporal stability and spatial divergence of mitochondrial DNA haplotype frequencies in red drum (Sciaenops ocellatus) from coastal regions of the western Atlantic Ocean and Gulf of Mexico

Citation
Jr. Gold et al., Temporal stability and spatial divergence of mitochondrial DNA haplotype frequencies in red drum (Sciaenops ocellatus) from coastal regions of the western Atlantic Ocean and Gulf of Mexico, MARINE BIOL, 133(4), 1999, pp. 593-602
Citations number
55
Categorie Soggetti
Aquatic Sciences
Journal title
MARINE BIOLOGY
ISSN journal
00253162 → ACNP
Volume
133
Issue
4
Year of publication
1999
Pages
593 - 602
Database
ISI
SICI code
0025-3162(199905)133:4<593:TSASDO>2.0.ZU;2-B
Abstract
Restriction-site variation in mitochondrial (mt) DNA was assayed among 1675 red drum (Sciaenops ocellatus Linnaeus) sampled from 20 localities along t he southeastern coast of the USA (western Atlantic) and the Gulf of Mexico (Gulf). Up to four consecutive year-classes (cohorts) were sampled at most localities. Nucleotide-sequence divergence among 170 mtDNA haplotypes ident ified ranged tin percentage) from 0.184 to 1.913, with a mean (+/-SD) of 0. 887 +/- 0.300. Comparisons of mtDNA haplotype frequencies across year-class es within localities were non-significant, indicating temporal stability of breeding components within localities. Significant heterogeneity in mtDNA haplotype frequencies was found across all localities, between (pooled) sam ples from the western Atlantic and the Gulf, and among geographically space d, regional groupings in the Gulf. Genetic divergence between subpopulation s of red drum in the western Atlantic and Gulf follows a pattern exhibited in other marine fishes, and probably stems from physical (historical enviro nmental heterogeneity, absence of suitable habitat, and current patterns) a nd, perhaps, behavioral factors. Genetic differences among red drum in the Gulf appear to be due largely to an isolation-by-distance effect that is at tributable to behavioral factors. The latter may include female philopatry to natal bays or estuaries, limited offshore (coastwise) movement of female s relative to their natal bay or estuary, or both. Genetic divergence among red drum in the Gulf occurs despite high gene flow (estimated as the numbe r of genetic effective migrants in an island mode). Conservation and manage ment of red drum should be based on the premise that strategies for a given bay or estuary will impact geographically proximal bays or estuaries more than distal ones. Trajectories of correlograms in spatial autocorrelation a nalysis suggest a geographic neighborhood size, relative to genetic migrati on of red drum from a bay or estuary, of roughly 500 to 600 km.