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Geographical Distribution of Enzyme Polymorphisms in the Lichen Umbilicaria mammulata
Cecilia Hageman and Dianne Fahselt
Vol. 95, No. 3 (Autumn, 1992), pp. 316-323
Published by: American Bryological and Lichenological Society
Stable URL: http://www.jstor.org/stable/3243490
Page Count: 8
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Geographic patterns of intraspecific variation of isoenzymes were examined in Umbilicaria mammulata (Ach.) Tuck., the most common umbilicate lichen in eastern North America. Multidimensional relationships among thalli from 13 sites were expressed graphically through Principal Components and Cluster Analyses and, in some cases, a close relationship was evident between stands located near one another or aligned with prevailing winds. However, that there was sometimes less similarity between nearby collection sites than between geographically distant ones, was a finding at variance with an earlier study based on fewer collection sites. This result indicates the importance of sampling intensity in isoenzyme studies. Wind patterns in the study area were complex and it was not clear whether wind was involved in dissemination or to some extent responsible for geographic distribution of isozyme patterns. In spite of intraspecific variation, many features of enzyme profiles were consistent throughout the sampling range.
The Bryologist © 1992 American Bryological and Lichenological Society