5 Works

Data from: Adaptive landscapes in evolving populations of Pseudomonas fluorescens

Anita H. Melnyk & Rees Kassen
The repeatability of adaptive evolution depends on the ruggedness of the underlying adaptive landscape. We contrasted the relative ruggedness of adaptive landscapes across two environments by measuring the variance in fitness and metabolic phenotype within and among genetically distinct strains of Pseudomonas fluorescens in two environments differing only in the carbon source provided (glucose vs. xylose). Fitness increased in all lines, plateauing in one environment but not the other. The pattern of variance in fitness...

Data from: Dietary stress does not strengthen selection against single deleterious mutations in Drosophila melanogaster

Howard D. Rundle, Kelsie MacLellan, Lucia Kwan & Michael C. Whitlock
Stress is generally thought to increase the strength of selection, although empirical results are mixed and general conclusions are difficult because data are limited. Here we compare the fitness effects of nine independent recessive mutations in Drosophila melanogaster in a high- and low-dietary-stress environment, estimating the strength of selection on these mutations arising from both a competitive measure of male reproductive success and productivity (female fecundity and the subsequent survival to adulthood of her offspring)....

Data from: Stronger convex (stabilizing) selection on homologous sexual display traits in females than in males: a multipopulation comparison in Drosophila serrata

Howard D. Rundle & Stephen F. Chenoweth
Mutual mate choice for homologous sexual display traits has been demonstrated in Mutual mate choice for homologous sexual display traits has been demonstrated in several recent studies yet little attention has been given to quantitative comparison of the strength and form of mate preferences between the sexes. Such comparisons may provide important insight into the evolution of mate choice for honest signals. In particular, because females generally provide the majority of resources for initial offspring...

Data from: Analysis of inbreeding depression in mixed-mating plants provides evidence for selective interference and stable mixed mating

Alice A Winn, Elizabeth Elle, Susan Kalisz, Pierre-Olivier Cheptou, Christopher G Eckert, Carol Goodwillie, Mark O. Johnston, David A Moeller, Richard H Ree, Risa D Sargent & Mario Vallejo-MarĂ­n
Hermaphroditic individuals can produce both selfed and outcrossed progeny, termed mixed mating. General theory predicts that mixed-mating populations should evolve quickly toward high rates of selfing, driven by rapid purging of genetic load and loss of inbreeding depression (ID), but the substantial number of mixed-mating species observed in nature calls this prediction into question. Greater average ID reported for selfing than for outcrossing populations is consistent with purging and suggests that mixed-mating taxa in evolutionary...

Data from: The length of adaptive walks is insensitive to starting fitness in Aspergillus nidulans

Danna R Gifford, Sijmen E Schoustra & Rees Kassen
Adaptation involves the successive substitution of beneficial mutations by selection, a process known as an adaptive walk. Gradualist models of adaptation, which assume that all mutations are small relative to the distance to a fitness optimum, predict that adaptive walks should be longer when the founding genotype is less well adapted. More recent work modelling adaptation as a sequence of moves in phenotype or genotype space predicts, by contrast, much shorter adaptive walks irrespective of...

Registration Year

  • 2011
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  • University of Ottawa
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  • Centre d'Ecologie Fonctionnelle et Evolutive
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  • Field Museum of Natural History
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  • University of Queensland
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  • University of Minnesota
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  • University of Pittsburgh
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  • Dalhousie University
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  • Simon Fraser University
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  • Queen's University
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