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Self-Fertility in Maritime and Zinc Mine Populations of Armeria maritima (Mill.) Willd.

C. Lefebvre
Evolution
Vol. 24, No. 3 (Sep., 1970), pp. 571-577
DOI: 10.2307/2406837
Stable URL: http://www.jstor.org/stable/2406837
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.
Self-Fertility in Maritime and Zinc Mine Populations of Armeria maritima (Mill.) Willd.
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Abstract

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.

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