Stabilising selection in Drosophila melanogaster

Barnes, Bret

doi:10.1038/hdy.1968.54

Cited by 30 publications

(24 citation statements)

References 27 publications

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“…There is no reason, in general, to suppose that, in populations containing extensive genetic variation, both should not operate. On the other hand, there is evidence that heterotic selection is not acting for chaeta number in populations of D. melanogaster derived from crosses between two inbred lines (Barnes, 1968;Killick, 1970). We suggest that it is not necessary for the type of relationship between a metrical character and fitness illustrated by fig.…”

Section: Methodsmentioning

confidence: 69%

Variation for metrical characters in Drosophila populations III. The nature of selection

1971

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Section: Methodsmentioning

confidence: 69%

Variation for metrical characters in Drosophila populations III. The nature of selection

1971

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“…Thereafter all of the lines show evidence of effective stabilising selection, although the optimum phenotype was probably lower in the control lines than the phenotype artificially selected in the stabilised lines. Barnes (1968) showed that sternopleural bristle number was subjected to stabilising selection in cage populations maintained at two temperatures, the optimum phenotype depending on the temperature. Evidence for the adaptive significance of sternopleural bristle number in populations maintained at different temperatures was previously obtained by Beardmore (in Thoday, 1959).…”

Section: Discussionmentioning

confidence: 99%

“…Such selection has been investigated theoretically (Wright, 1935;Robertson, 1956;Latter, 1960;Curnow, 1964;Singh and Lewontin, 1966;Gale and Kearsey, 1968) and experimentally (Falconer, 1957;Thoday, 1959;Prout, 1962;Scharloo, 1964;Barnes, 1968). All of these studies assumed or were carried out in a constant environment.…”

Section: Introductionmentioning

confidence: 99%

Stabilising selection in constant and fluctuating environments

Gibson

Bradley

1974

Heredity

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SUMMARYSelection in both constant and fluctuating temperature environments for a constant bristle number in Drosophila melanogaster resulted in the maintenance of that number and in a decrease of both genetic and environmental variance. Although mean bristle number in the control lines increased over the early generations there was a significant net decrease. Phenotypic variance decreased significantly, especially in later generations. In both control lines and in the line selected at 20-29° C. there was a significant decrease in asymmetry of bristle number. There was also a decrease in environmental variance in these three lines. Transplant experiments showed that when the lines were cultured in alien environments phenotypic variance tended to increase in the fluctuating and decrease in the constant temperature environment. However at generation 39, the phenotypic variance of lines selected in the fluctuating environment increased when samples of the lines were cultured in the constant temperature environment. The results indicate that stabilising selection can be effective in both fluctuating and constant temperature environments.

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“…Firstly, on the overall rate of response to selection, and secondly, on the disruption of selection plateaus. The nature of the mechanisms involved in these phenomena have been examined further by a study of the influence of temperature and selection on a population, particular attention being given to their joint effects on fitness (Barnes, 1966).…”

Section: Introductionmentioning

confidence: 99%