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Breeding Systems of Tree Species of a Lowland Tropical Community

K. S. Bawa
Evolution
Vol. 28, No. 1 (Mar., 1974), pp. 85-92
DOI: 10.2307/2407241
Stable URL: http://www.jstor.org/stable/2407241
Page Count: 8
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Breeding Systems of Tree Species of a Lowland Tropical Community
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Abstract

The nature of breeding systems in tree species of a tropical lowland semideciduous forest in Costa Rica were investigated by controlled pollinations and observations on floral biology. Of an estimated 130 tree species in the community, 14% of the species were found to be self-compatible, 54% self-incompatible, 22% dioecious and 10% monoecious. The figures for self-compatible and self-incompatible species are based on results of controlled pollinations on 34 out of 88 hermaphroditic species (those with perfect flowers) that occur in the study area. Although the degree of cross-pollination in self-compatible and monoecious species is not known, it can be stated that at least 76% of the species had a xenogamous mode of reproduction. Intrapopulational variation in breeding systems was recorded in several species. The nature of breeding systems in tree species of a tropical semideciduous forest, tropical rain-forest, and a north temperate zone forest is compared. The evolutionary significance of observed breeding systems and variation thereof is discussed briefly.

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