MORPHOLOGICAL EVOLUTION IN RESPONSE TO FLUCTUATING SELECTION
نویسندگان
چکیده
منابع مشابه
Adaptations to fluctuating selection in Drosophila.
Time-dependent selection causes the adaptive evolution of new phenotypes, and this dynamics can be traced in genomic data. We have analyzed polymorphisms and substitutions in Drosophila, using a more sensitive inference method for adaptations than the standard population-genetic tests. We find evidence that selection itself is strongly time-dependent, with changes occurring at nearly the rate o...
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The evolution and maintenance of social learning, in competition with individual learning, under fluctuating selection have been well-studied in the theory of cultural evolution. Here, we study competition between vertical and oblique cultural transmission of a dichotomous phenotype under constant, periodically cycling, and randomly fluctuating selection. Conditions are derived for the existenc...
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Contrary to classical population genetics theory, experiments demonstrate that fluctuating selection can protect a haploid polymorphism in the absence of frequency dependent effects on fitness. Using forward simulations with the Moran model, we confirm our analytical results showing that a fluctuating selection regime, with a mean selection coefficient of zero, promotes polymorphism. We find th...
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We tested whether directional selection on an index-based wing character in Drosophila melanogaster affected developmental stability and patterns of directional asymmetry. We selected for both an increase (up selection) and a decrease (down selection) of the index value on the left wing and compared patterns of fluctuating and directional asymmetry in the selection index and other wing traits a...
متن کاملComparing environmental and genetic variance as adaptive response to fluctuating selection.
Phenotypic variation within populations has two sources: genetic variation and environmental variation. Here, we investigate the coevolution of these two components under fluctuating selection. Our analysis is based on the lottery model in which genetic polymorphism can be maintained by negative frequency-dependent selection, whereas environmental variation can be favored due to bet-hedging. In...
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ژورنال
عنوان ژورنال: Evolution
سال: 1996
ISSN: 0014-3820
DOI: 10.1111/j.1558-5646.1996.tb03635.x