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• W2083668757 abstract "The Adh and alpha Gpdh allozyme loci (both located on the second chromosome) showed considerable fluctuations in allele frequencies in a seminatural population of Drosophila melanogaster during 1972-97. Both long-term and short-term fluctuations were observed. The short-term fluctuations occurred within almost all years and comparison of allele frequencies between winters and summers showed significantly higher Adh(S) (P <0.001) and alpha Gpdh(F) (P <0.01) allele frequencies in summers. Frequencies of these alleles were significantly positively correlated with environmental temperature, suggesting the adaptive significance of these allozyme polymorphisms. Frequency changes of the Odh locus (located on the third chromosome) showed no seasonal pattern and were not correlated with environmental temperature. Almost all short-term and long-term increases in Adh(S) frequency were accompanied by a corresponding decrease in alpha Gpdh(S) frequency (r = -0.82, P <0.001) and vice versa. Further analysis showed that gametic disequilibria between the Adh and alpha Gpdh loci, which frequently occurred, were due to the presence of inversion In(2L)t located on the same chromosome arm and In(2L)t frequencies were positively correlated with environmental temperature. Gametic disequilibria between Adh and Odh and between Odh and alpha Gpdh were hardly observed. Because In(2L)t is exclusively associated with the Adh(S)/alpha Gpdh(F) allele combination, the observed correlated response in Adh/alpha Gpdh allele frequencies is (at least partly) explained by hitchhiking effects with In(2L)t. This means that the adaptive value of the allozyme polymorphisms has been overestimated by ignoring In(2L)t polymorphism. Fluctuations in Adh allele frequencies are fully explained by selection on In(2L)f polymorphism, whereas we have shown that alpha Gpdh frequency fluctuations are only partly explained by chromosomal hitchhiking, indicating the presence of selective differences among aGpdh genotypes in relation with temperature and independent of In(2L)t. Frequency fluctuations of aGpdh and In(2L)t are consistent with their latitudinal distributions, assuming that temperature is the main environmental factor varying with latitude that causes directly or indirectly these frequency distributions. However, the results of the tropical greenhouse population show no correlation of Adh (independent of li?(2L)t) and Odh allele frequencies with environmental temperature, which may indicate that the latitudinal distribution in allele frequencies for these loci is not the result of selection on the FIS polymorphism in a direct way." @default.
• W2083668757 created "2016-06-24" @default.
• W2083668757 creator A5005044477 @default.
• W2083668757 creator A5056859462 @default.
• W2083668757 date "1999-07-01" @default.
• W2083668757 modified "2023-09-24" @default.
• W2083668757 title "A long-term study on interactions between the Adh and alphaGpdh allozyme polymorphisms and the chromosomal inversion In(2L)t in a seminatural population of D. melanogaster" @default.
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• W2083668757 doi "https://doi.org/10.1046/j.1420-9101.1999.00083.x" @default.
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