You are not currently logged in.
Access your personal account or get JSTOR access through your library or other institution:
If You Use a Screen ReaderThis content is available through Read Online (Free) program, which relies on page scans. 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.
Self-Fertility in Maritime and Zinc Mine Populations of Armeria maritima (Mill.) Willd.
Vol. 24, No. 3 (Sep., 1970), pp. 571-577
Published by: Society for the Study of Evolution
Stable URL: http://www.jstor.org/stable/2406837
Page Count: 7
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.
Preview not available
Self-fertility has been studied in maritime (non-metal-tolerant) and in mine (metal-tolerant) populations of Armeria. The results show that the mine populations contain individuals which have a high rate of self-fertility (30-40%). Seaside populations do not contain such self-fertile individuals. It seems that the normal equilibrium between A and B-types is disrupted in favor of B-type in mine populations, but A and B-types do not differ significantly in self-fertility. Self-fertility in Armeria could not be assumed to have evolved as an adaptive mechanism preventing dilution of metal tolerance by genetic flow coming from neighboring non-tolerant populations, as Armeria is only growing on mine sites. The origin and maintenance of self-fertility in Armeria must be related to the breeding system of colonizing species. In that case self-fertility provides a reliable production of seeds in the first stages of colonization when the plants are spaced. Because the unstable mine habitat produces continuously colonizing situations maintenance of self-fertility can be insured.
Evolution © 1970 Society for the Study of Evolution