158 resultados para contemporary American painting

em Aquatic Commons


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Evolutionary associations among the four North American species of menhadens (Brevoortia spp.) have not been thoroughly investigated. In the present study, classifications separating the four species into small-scaled and large-scaled groups were evaluated by using DNA data, and genetic associations within these groups were explored. Specifically, data from the nuclear genome (microsatellites) and the mitochondrial genome (mtDNA sequences) were used to elicit patterns of recent and historical evolutionary associations. Nuclear DNA data indicated limited contemporary gene flow among the species, and also indicated higher relatedness within the small-scaled and large-scaled menhadens than between these groups. Mitochondrial DNA sequences of the large-scaled menhadens indicated the presence of two ancestral lineages, one of which contained members of both species. This result may indicate genetic diver-gence (reproductive isolation) followed by secondary contact (hybridization) between these species. In contrast, a single ancestral lineage indicated incomplete genetic divergence between the small-scaled menhaden. These results are discussed in the context of the biology and demographics of each species.

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(PDF contains 39 pages.)

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Missing the April issue. (PDF has 26 pages.)

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(PDF contains 34 pages.)

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(PDF contains 112 pages.)

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(PDF contains 96 pages.)

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(PDF contains 84 pages.)

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(PDF contains 62 pages.)

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Missing November issue. (PDF contains 62 pages.)

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Missing July, August, October issues. (PDF contains 56 pages.)

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Missing June issue. (PDF contains 50 pages.)

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(PDF contains 118 pages.)

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(PDF contains 120 pages.)

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(PDF contains 116 pages.)

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(PDF contains 127 pages.)