Journal
HEREDITY
Volume 97, Issue 1, Pages 33-37Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/sj.hdy.6800835
Keywords
sympatric speciation; parapatric speciation; metal tolerance; cline; Wallace effect; assortative mating
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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 selective maintenance of this difference.
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