Fitness rebound in serially bottlenecked populations of the house fly

When dominance and epistasis contribute to genetic variance, a portion of this nonadditive variance can be converted into additive genetic variance during a bottleneck to increase the overall level of additive genetic variance available for selectional response. As a result, additive genetic variati...

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Bibliographic Details
Published in:The American naturalist 1990-10, Vol.136 (4), p.542-549
Main Authors: Bryant, E.H. (University of Houston, Houston, TX), Meffert, L.M, McCommas, S.A
Format: Article
Language:English
Subjects:
Diptera
Ecological competition
ENDOGAMIA
EVOLUCION
EVOLUTION
Evolutionary genetics
FILOGENIA
Flies
Founder effect
GENETIC VARIATION
INBREEDING
Inbreeding coefficient
INBREEDING DEPRESSION
MUSCA DOMESTICA
Muscidae
Notes and Comments
PHYLOGENIE
PHYLOGENY
Population genetics
Quantitative genetics
SPECIATION
VARIACION GENETICA
VARIATION GENETIQUE
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Summary:When dominance and epistasis contribute to genetic variance, a portion of this nonadditive variance can be converted into additive genetic variance during a bottleneck to increase the overall level of additive genetic variance available for selectional response. As a result, additive genetic variation would become available to a founder population when selection may be most intense in the invasion of a new territory. The major problem of such a scenario is that several measures of fitness in our bottleneck lines declined in relationship to the control line. If this lowered fitness were to persist, these lines would not be viable progenitors of future populations. In making such an assessment, however, it is important to follow the fitness of bottleneck lines for a longer period. Not all individuals within an inbred population are necessarily inbred to the same degree, and if there is a correlation between degree of inbreeding and fitness within these populations, natural selection could quickly restore fitness. This note reports on the changing fitness of our bottleneck lines through five successive bottleneck cycles.
ISSN:0003-0147
1537-5323
DOI:10.1086/285112