Abstract
An allozyme analysis of the mating systems of Shorea congestiflora and S. trapezifolia provide the first quantitative estimates of outcrossing in a rain forest plant of the Old World tropics. Prior to recent deforestation, both endemic species formed vast co-dominant stands with other dipterocarp trees in the southwest of Sri Lanka. Outcrossing rates were determined from seed cohorts collected from trees in the Sinharaja Biosphere Reserve. Eighty-seven percent of the seeds of S. congestiflora were the result of the maternal tree mating with other unrelated individuals. This high population outcrossing rate is typical of the limited number of rain forest trees studied in the neotropics (...)
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