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Titolo:
Marine population structure in an anadromous fish: life-history influencespatterns of mitochondrial DNA variation in the eulachon, Thaleichthys pacificus
Autore:
McLean, JE; Hay, DE; Taylor, EB;
Indirizzi:
Univ Washington, Sch Fisheries, Seattle, WA 98195 USA Univ Washington Seattle WA USA 98195 Sch Fisheries, Seattle, WA 98195 USA Fisheries & Oceans Canada, Pacific Biol Stn, Nanaimo, BC V9R 5K6, Canada Fisheries & Oceans Canada Nanaimo BC Canada V9R 5K6 o, BC V9R 5K6, Canada Univ British Columbia, Dept Zool, Vancouver, BC V6T 1Z4, Canada Univ British Columbia Vancouver BC Canada V6T 1Z4 ver, BC V6T 1Z4, Canada
Titolo Testata:
MOLECULAR ECOLOGY
fascicolo: 12, volume: 8, anno: 1999, supplemento:, 1
pagine: S143 - S158
SICI:
0962-1083(199912)8:12<S143:MPSIAA>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
SALMON ONCORHYNCHUS-KETA; CHUM SALMON; GENETIC-STRUCTURE; WALLEYE POLLOCK; SOCKEYE-SALMON; RESTRICTION ENDONUCLEASES; REPRODUCTIVE ISOLATION; THERAGRA-CHALCOGRAMMA; STOCK IDENTIFICATION; ATLANTIC SALMON;
Keywords:
mitochondrial DNA; population structure; postglacial dispersal; RFLP; Thaleichthys pacificus;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
80
Recensione:
Indirizzi per estratti:
Indirizzo: McLean, JE Univ Washington, Sch Fisheries, Seattle, WA 98195 USA Univ Washington Seattle WA USA 98195 es, Seattle, WA 98195 USA
Citazione:
J.E. McLean et al., "Marine population structure in an anadromous fish: life-history influencespatterns of mitochondrial DNA variation in the eulachon, Thaleichthys pacificus", MOL ECOL, 8(12), 1999, pp. S143-S158

Abstract

Due to the apparent decline in size of a number of populations, eulachon, Thaleichthys pacificus, have recently become the focus of a conservation movement in the northeast Pacific. Little is known of the marine life-historyphase of this anadromous fish, and although it has been suggested that eulachon spawning in different rivers may form distinct populations, nothing is known of their population structure. Molecular genetic data were used to investigate population structure and possible management schemes. Mitochondrial DNA genotypes, determined through restriction fragment length polymorphisms (RFLP) analysis, were resolved in fish from several rivers throughoutthe geographical range of eulachon. Our data support the idea that extant eulachon populations result from postglacial dispersal from a single Wisconsinan glacial refuge. Further, while three of the 37 haplotypes recovered account for approximately 79% of the samples, many private haplotypes were observed, suggesting possible regional population structure. While a great deal of genetic variation was observed (37 haplotypes in 315 samples), an AMOVA showed that >97% of the total variation was detected within populations. As yet, it is unclear whether genetically distinct populations of eulachon exist, or if these fish may be treated as one or a few large populations. Results were tested against predictions made from hypotheses concerning the origin and persistence of subdivided populations in marine species, and seem to be more consistent with the Member-Vagrant hypothesis than isolationby distance. Eulachon present an interesting situation that illustrates the difficulties involved in defining management units in organisms with highlevels of gene now.

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Documento generato il 05/04/20 alle ore 04:05:16