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1 August 2003 FITNESS AND ADAPTATION IN A NOVEL ENVIRONMENT: EFFECT OF INBREEDING, PRIOR ENVIRONMENT, AND LINEAGE
David H. Reed, Edwin H. Lowe, David A. Briscoe, Richard Frankham
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Abstract

The ability of populations to undergo adaptive evolution depends on the presence of genetic variation for ecologically important traits. The maintenance of genetic variation may be influenced by many variables, particularly long-term effective population size and the strength and form of selection. The roles of these factors are controversial and there is very little information on their impacts for quantitative characters. The aims of this study were to determine the impacts of population size and variable versus constant prior environmental conditions on fitness and the magnitude of response to selection. Outbred and inbred populations of Drosophila melanogaster were maintained under benign, constant stressful, and variably stressful conditions for seven generations, and then forced to adapt to a novel stress for seven generations. Fitness and adaptability were assayed in each replicate population. Our findings are that: (1) populations inbred in a variable environment were more adaptable than those inbred in a constant environment; (2) populations adapted to a prior stressful environment had greater fitness when reared in a novel stress than those less adapted to stress; (3) inbred populations had lower fitness and were less adaptable than the outbred population they were derived from; and (4) strong lineage effects were detectable across environments in the inbred populations.

David H. Reed, Edwin H. Lowe, David A. Briscoe, and Richard Frankham "FITNESS AND ADAPTATION IN A NOVEL ENVIRONMENT: EFFECT OF INBREEDING, PRIOR ENVIRONMENT, AND LINEAGE," Evolution 57(8), 1822-1828, (1 August 2003). https://doi.org/10.1554/02-601
Received: 10 October 2002; Accepted: 2 March 2003; Published: 1 August 2003
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KEYWORDS
Drosophila melanogaster
Environmental heterogeneity
genetic variation
genotype-environment interactions
laboratory adaptation
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