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January American Naturalist highlights
Date:1/4/2008

rs and stigma (the parts of a flower that send and receive pollen) when flowers of the second species are present. Since clustering of anthers and stigma is known to promote self-fertilization, this suggests that one way for plants to avoid pollen deposition from the wrong species is to increase the rate of self-pollination, says Robin Smith. In a broader sense, however, these results are important because they provide direct evidence for what ecological and evolutionary theory has long predicted, which is that species interactions can influence selection on morphological traits and drive phenotypic divergence.


"Genetic constraints and the evolution of display trait sexual dimorphism by natural and sexual selection"
Stephen F. Chenoweth (University of Queensland), Howard D. Rundle (University of Queensland and University of Ottawa), and Mark W. Blows (University of Queensland)

Same, but different: the evolution of male-female differences within a shared genome

One of the major components of the worlds biological diversity are the differences between males and females in traits related to mating, including weapons used when competing for mates and display traits used to seduce them. Such gender differences are thought to arise because selection acts differently on each sex. The conflicting interests of males and females in reproduction are thought to be a key source of sex-specific selection on such traits. The evolution of sexual dimorphism is hampered, however, because the sexes share the majority of their genomes; an adaptive response to selection in one sex may therefore cause nonadaptive changes in the other as a correlated response. In a recent study, Steve Chenoweth and colleagues Howard Rundle and Mark Blows from the University of Queensland, Australia, tackle the combined issues of genetic control and sex-specific selection in a comprehensive investigation of the evolution of male-female differences in a se
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Contact: Rudy Faust
rfaust@press.uchicago.edu
773-834-0386
University of Chicago Press Journals
Source:Eurekalert

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