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Titolo:
Isolation by distance in the Atlantic cod, Gadus morhua, at large and small geographic scales
Autore:
Pogson, GH; Taggart, CT; Mesa, KA; Boutilier, RG;
Indirizzi:
Univ Calif Santa Cruz, Dept Ecol & Evolutionary Biol, Santa Cruz, CA 95064USA Univ Calif Santa Cruz Santa Cruz CA USA 95064 ol, Santa Cruz, CA 95064USA Univ Calif Santa Cruz, Inst Marine Sci, Santa Cruz, CA 95064 USA Univ Calif Santa Cruz Santa Cruz CA USA 95064 i, Santa Cruz, CA 95064 USA Dalhousie Univ, Dept Oceanog, Halifax, NS B3H 4J1, Canada Dalhousie Univ Halifax NS Canada B3H 4J1 nog, Halifax, NS B3H 4J1, Canada Univ Cambridge, Dept Zool, Cambridge CB2 3EJ, England Univ Cambridge Cambridge England CB2 3EJ ool, Cambridge CB2 3EJ, England
Titolo Testata:
EVOLUTION
fascicolo: 1, volume: 55, anno: 2001,
pagine: 131 - 146
SICI:
0014-3820(200101)55:1<131:IBDITA>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
POPULATION GENETIC-STRUCTURE; DIFFERENT SPATIAL SCALES; MICROSATELLITE POLYMORPHISM; BALANOPHYLLIA ELEGANS; NATURAL-POPULATIONS; NORTHWEST ATLANTIC; SCOTIAN SHELF; F-STATISTICS; FRESH-WATER; REEF FISHES;
Keywords:
Gadus morhua; gene flow; isolation by distance; nuclear restriction-fragment-length-polymorphism loci; population structure;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
77
Recensione:
Indirizzi per estratti:
Indirizzo: Pogson, GH Univ Calif Santa Cruz, Dept Ecol & Evolutionary Biol, Santa Cruz, CA 95064USA Univ Calif Santa Cruz Santa Cruz CA USA 95064 ruz, CA 95064USA
Citazione:
G.H. Pogson et al., "Isolation by distance in the Atlantic cod, Gadus morhua, at large and small geographic scales", EVOLUTION, 55(1), 2001, pp. 131-146

Abstract

Genetic isolation by distance (IBD) has rarely been described in marine species with high potential for dispersal at both the larval and adult life-history stages. Here, we report significant relationships between inferred levels of gene flow and geographic distance in the Atlantic cod, Gadus morhua, at 10 nuclear restriction-fragment-length-polymorphism (RFLP) loci at small regional scales in the western north Atlantic region (< 1600 km) that mirror those previously detected over its entire geographic range (up to 7300 km). Highly significant allele frequency differences were observed among eight northwestern Atlantic populations, although the mean F-ST for all 10 loci was only 0.014. Despite this weak population structuring, the distanceseparating populations explained between 54% and 62% of the variation in gene flow depending on whether nine or 10 loci were used to estimate Nm. Across the species' entire geographic range, highly significant differences were observed among six regional populations at nine of the 10 loci (mean F-ST = 0.068) and seven loci exhibited significant negative relationships between gene flow and distance. At this large geographic scale, natural selection acting in the vicinity of one RFLP locus (GM798) had a significant effect on the correlation between gene flow and distance, and eliminating it from the analysis caused the coefficient of determination to increase from 17%to 62%. The role of vicariance was assessed by sequentially removing populations from the analysis and was found to play a minor role in contributingto the relationship between gene flow and distance at either geographic scale. The correlation between gene flow and distance detected in G. morhua at small and large spatial scales suggests that dispersal distances and effective population sizes are much smaller than predicted for the species and that the recent age of populations, rather than extensive gene flow, may beresponsible for its weak population structure. Our results suggest that interpreting limited genetic differences among populations as reflecting highlevels of ongoing gene how should be made with caution.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/07/20 alle ore 21:22:10