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Realized Gene Flow Via Pollen in Artificial Populations of Musk Thistle, Carduus nutans L.

C. A. Smyth and J. L. Hamrick
Evolution
Vol. 41, No. 3 (May, 1987), pp. 613-619
DOI: 10.2307/2409263
Stable URL: http://www.jstor.org/stable/2409263
Page Count: 7
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Realized Gene Flow Via Pollen in Artificial Populations of Musk Thistle, Carduus nutans L.
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Abstract

Realized gene flow via pollen was measured in four adjacent, artificial populations of musk thistle, Carduus nutans L. by observing the distribution of electrophoretic markers at two allozyme loci. Realized gene movement declined exponentially with distance. Dispersal distances of the marker alleles averaged 5.0 m. Estimates of effective neighborhood sizes based on the movement of these genetic markers ranged from 126 to 378 individuals. When measures of seed movement were included, estimates of effective population sizes range from 1,281 to 3,844 individuals. It is, therefore, unlikely that chance effects play a major role in shaping the genetic structure of well-established musk thistle populations.

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