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Esterase Variation Associated with Elevation, Latitude and Ploidy Level in Populations of the Mimulus glabratus Complex

Robert K. Vickery, Jr. and Sun Szen Hsu
The American Midland Naturalist
Vol. 111, No. 1 (Jan., 1984), pp. 96-104
DOI: 10.2307/2425547
Stable URL: http://www.jstor.org/stable/2425547
Page Count: 9
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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.
Esterase Variation Associated with Elevation, Latitude and Ploidy Level in Populations of the Mimulus glabratus Complex
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Abstract

Esterases from 72 populations of the Mimulus glabratus complex (Scrophulariaceae) from North, Central and South America were analyzed by disc electrophoresis. Apparently, four loci and 10 alleles are present. The allozymes these alleles produce occur in eight characteristic combinations. Each population is monomorphic for a particular combination, i.e., genotype. These genotypes are highly significantly (p < .01) correlated with the elevation and latitude of the populations and tend to be associated with their polyploid level as well. The resulting geographic and elevational distribution patterns appear to reflect the presence of two widespread generalist genotypes and six specialist genotypes, each of which occurs in a particular environment.

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