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• W2017615171 endingPage "357" @default.
• W2017615171 startingPage "345" @default.
• W2017615171 abstract "Two morphologically and ecologically distinct forms of smelt, Osmerus, reside sympatrically in Lake Utopia, south-western New Brunswick, Canada. The ‘normal-sized’ form matures at greater than 200 mm standard length, averages about 31–33 gill rakers, and spawns in lake outlets. By contrast, the ‘dwarf-sized’ form matures at less than 150 mm standard length, averages 34–36 gill rakers, and spawns in small streams 3–5 weeks later than the normal form. We tested whether these sympatric forms represented ecological polymorphism within a single population or two reproductively isolated demes by assaying variation within and between forms by mitochondrial DNA (mtDNA) restriction site and nuclear minisatellite DNA analyses. Analysis of smelt mtDNA with twelve restriction enzymes resolved ten composite genotypes (differing by an average 0.27% sequence divergence) which differed markedly in frequency between the forms. Net percentage sequence divergence between the forms was O.l6%. A Wagner parsimony/ bootstrapping analysis of the restriction site presence/absence matrix, however, suggested that there were no significant distinctions between dwarf and normal smelt based on the phylogeny of composite genotypes. Hybridization studies of genomic DNA digests with a minisatellite probe indicated both that nuclear restriction fragment differentiation and the frequency of specific fragments differed significantly between the forms. Significant genetic differentiation between the sympatric forms demonstrates that they are distinct gene pools and reproductively isolated. Our molecular evidence for reproductive isolation between dwarf and normal smelt in Lake Utopia, coupled with the persistent morphological and ecological differentiation between them, argues strongly that they are behaving as distinct species. The Lake Utopia Osmerus populations provide further illustration of the potential for rapid differentiation to the level of biological species in postglacial environments." @default.
• W2017615171 created "2016-06-24" @default.
• W2017615171 creator A5018832679 @default.
• W2017615171 creator A5019091873 @default.
• W2017615171 date "1993-12-01" @default.
• W2017615171 modified "2023-10-12" @default.
• W2017615171 title "Molecular genetic evidence for reproductive isolation between sympatric populations of smelt Osmerus in Lake Utopia, south-western New Brunswick, Canada" @default.
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• W2017615171 doi "https://doi.org/10.1111/j.1365-294x.1993.tb00028.x" @default.
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