Evolution in closely adjacent plant populations X: long-term persistence of prereproductive isolation at a mine boundary

  title={Evolution in closely adjacent plant populations X: long-term persistence of prereproductive isolation at a mine boundary},
  author={Janis Antonovics},
Flowering time differences between metal-tolerant and nontolerant populations of the grass Anthoxanthum odoratum growing across a mine boundary have persisted for over 40 years. These flowering time differences result in a high degree of prezygotic genetic isolation (isolation index=0.43) between the tolerant mine populations and nontolerant pasture populations. Previous work showing genetic determination of flowering time and a high turnover of individual plants argues strongly for the… 
Maintenance of soil ecotypes of Solidago virgaurea in close parapatry via divergent flowering time and selection against immigrants
The often patchy distribution of serpentine geology can lead to abrupt changes in soil and microclimates. Thus, serpentine areas provide an ideal natural setting to understand how divergent selection
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Both reduced competitiveness and greater susceptibility to herbivory have been documented among some edaphic specialists when grown in ‘normal’ soils, suggesting that a high physiological cost of tolerance may result in strong divergent selection across soil boundaries.
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This framework allows us to demonstrate that only local ecotypes experience positive population growth (lambda>1) and that the maintenance of divergent adaptation is mediated via habitat- and life stage-specific selection.
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Hybrid Sterility over Tens of Meters Between Ecotypes Adapted to Serpentine and Non-Serpentine Soils
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The evolution of reproductive isolation in closely adjacent plant populations through differential flowering time
It is suggested that the evolution of reproductive isolation may sometimes start through a selectively neutral process, which can secondarily enhance the adaptation to divergent selection regimes in adjacent plant populations.
Evolution in closely adjacent plant populations VIII. Clinal patterns at a mine boundary
The morphological characters of plants of the grass Anthoxant hum odoratum L. odoratum taken from sites along a transect across a mine/pasture boundary were investigated and concluded that in general tolerant plants had smaller flowers, smaller leaves and thinner stems.
Genetic linkage of ecological specialization and reproductive isolation in pea aphids
A model of the role of genetic correlations in specialization and speciation is presented, and several complexes of pleiotropic or closely linked quantitative trait loci that affect key traits in ways that would promote speciation are found.
Results suggest that changes in ploidy disrupt a simple monotonic relationship between isolation and genetic distance in Silene, and find no evidence for the operation of speciation via reinforcement.
Evolution in closely adjacent plant populations IV. Barriers to gene flow
Since no evidence has been presented for the origin of breeding barriers under disruptive selection in natural populations, the occurrence of mechanisms reducing gene flow were investigated in closely adjacent plant populations at metal mine boundaries.
Evolution in closely adjacent plant populations VI. Manifold effects of gene flow
The aim of this paper is to describe the effects of gene flow on a population using a computer simulation and to highlight the importance of the interplay between gene flow and selection in determining patterns of differentiation between adjacent populations.
Adaptive Speciation: Ecological Speciation in Flowering Plants
This chapter adopts the broader term ecological speciation, as it review the forms it may take in flowering plants, or angiosperms, and explores whether there is evidence for adaptive speciation more specifically.
The data from Drosophila are unique-and are likely to remain so-because of the large number of crossable species and the ease of estimating sexual and postzygotic isolation in the laboratory, and some estimates of reproductive isolation and phylogenetic relatedness when better data became available are revised.
Sympatric speciation in animals: the ugly duckling grows up.
  • S. Via
  • Biology
    Trends in ecology & evolution
  • 2001
Speciation along environmental gradients
It is shown that along an environmental gradient, evolutionary branching can occur much more easily than in non-spatial models, and this facilitation is most pronounced for gradients of intermediate slope.