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ESTIMATION OF GENE FLOW AND GENETIC NEIGHBORHOOD SIZE BY INDIRECT METHODS IN A SELFING ANNUAL, TRITICUM DICOCCOIDES
Author(s) -
Golenberg Edward M.
Publication year - 1987
Publication title -
evolution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.84
H-Index - 199
eISSN - 1558-5646
pISSN - 0014-3820
DOI - 10.1111/j.1558-5646.1987.tb02470.x
Subject(s) - selfing , gene flow , biology , genetic distance , sample size determination , statistics , allele frequency , allele , genetic variation , genetics , mathematics , gene , population , demography , sociology
Rates of gene flow and neighborhood area were investigated in the selfing annual, Triticum dicoccoides. The collection of seed material was made using a spatial hierarchical sampling design in which four collection sites were 5–7 m apart, four were 15–17 m apart, and four were 100–120 m apart. Between 25 and 30 plants were scored from each site (mean sample size = 28.7). Two procedures for indirect estimation of gene flow were used on gene‐frequency data from 13 polymorphic loci. The estimates of Nm using Wright's (1943 a , 1943 b ) estimation procedure were 1.265, 0.212, and 0.357, for the closest, intermediate, and most distant distance classes, respectively. The estimates of Nm using Slatkin's (1985) private‐allele procedure were 4.675 (subsample ranges: 1.544–4.675), 0.110 (subsample ranges: 0.069–0.153), and 0.670 (subsample ranges: 0.129–0.256). The results indicate a general agreement between the two procedures. Both indicate a sharp decrease in gene flow beyond the first distance class (5–7 m). The large gene‐flow values and the large variation within the 5–7‐m distance class are taken as evidence that a genetic neighborhood for this species may cover an area defined by a 5‐m radius. The results also indicate that gene flow between populations separated by only 10 or more meters may be quite limited.