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Titolo:
Effects of postglacial range expansion on allozyme and quantitative genetic variation of the pitcher-plant mosquito, Wyeomyia smithii
Autore:
Armbruster, P; Bradshaw, WE; Holzapfel, CM;
Indirizzi:
Univ Oregon, Dept Biol, Eugene, OR 97402 USA Univ Oregon Eugene OR USA 97402 v Oregon, Dept Biol, Eugene, OR 97402 USA
Titolo Testata:
EVOLUTION
fascicolo: 6, volume: 52, anno: 1998,
pagine: 1697 - 1704
SICI:
0014-3820(199812)52:6<1697:EOPREO>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
POPULATION-STRUCTURE; EVOLUTIONARY DIVERGENCE; FOUNDER EVENTS; VARIANCE; PHOTOPERIODISM; EPISTASIS; HISTORY; CONSEQUENCES; BOTTLENECKS; SPECIATION;
Keywords:
founder event; genetic architecture; genetic drift; genetic variation; heterozygosity; isolation-by-distance; mosquito systematics; Wyeomyia smithii;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
63
Recensione:
Indirizzi per estratti:
Indirizzo: Armbruster, P Zool Soc London, Inst Zool, Regents Pk, London NW1 4RY, England Zool Soc London Regents Pk London England NW1 4RY , England
Citazione:
P. Armbruster et al., "Effects of postglacial range expansion on allozyme and quantitative genetic variation of the pitcher-plant mosquito, Wyeomyia smithii", EVOLUTION, 52(6), 1998, pp. 1697-1704

Abstract

We determined allozyme variability of 34 populations of the pitcher-plant mosquito, Wyeomyia smithii, from Florida (30 degrees N) to northern Manitoba (54 degrees N) and compared allozyme variability with the additive genetic variance for preadult development time and photoperiodic response determined previously for six populations over a similar range (30-50 degrees N). Phylogenetic analysis of allozymes shows a well-defined split between Gulf Coast and lowland North Carolina populations, similar to previously observed phylogeographic patterns in a wide variety of taxa. A deeper split in thephylogeny of W. smithii coincides with the location of the maximum extent of the Laurentide Ice Sheet. Furthermore, both average heterozygosity and patterns of isolation-by-distance decline in populations north of the formerglacial border. It is likely that northern populations are the result of arange expansion that occurred subsequent to the late-Wisconsin retreat of the Laurentide Ice Sheet and that these populations have not yet reached a drift-migration equilibrium. The northern decline in allozyme heterozygosity contrasts sharply with the northern increase in additive genetic varianceof development time and photoperiodic response found in previous studies. These previous studies also showed that the genetic divergence of populations has involved stochastic variation in the contribution of dominance and epistasis to the genetic architecture underlying demographic traits, including preadult development time, and photoperiodic response. When taken together, the present and prior studies identify the genetic processes underlyingthe lack of concordance between geographic patterns of allozyme and quantitative genetic variation in natural populations of W. smithii. In the presence of nonadditive genetic variation, isolation and drift can result in opposite patterns of genetic variation for structural genes and quantitative traits.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/03/20 alle ore 00:42:40