Ecologia da polinização de Oenocarpus mapora Karsten. (arecaceae) nas condições de Belém (PA).

Abstract

The observations were made in six eleven-year-old individuals of an experimental area of Eastern Amazon Embrapa, Belém, PA, from July/1990 to June/1991. The inflorescence had unisexual flowers involved by two bracts. The female flowers are actinomorphic with three sepals and three clear petals stuck to the stigma, flanked by two male flowers with the same color, amount of sepals, petals and with six stamens. The flowering and fruiting happened during all observation months with flowering and fruiting peaks in January and September, respectively. The floral events, in inflorescence, happened in 26 days with different phases. The male phase began with the exhibition of the inflorescence, which was desuniforme and completed in seven days. Each flower tended to have explosive anthesis and falling in minutes. The female phase was also variable and happened in twelve days, beginning about seven days after the end of the male phase. The flowers were viable for 24 to 36 hours after the stigma exposure. Male and female flowers had vesper tines anthesis starting from 4pm. The pollen viability was higher in solitary flowers and in the dyads. The floral rewards were the pollen and scent. They spent 110 days to the fruit maturation. The insect visitors were the coleopters, hymenopters and heteropters. Bacabi could be considered as monoecious specie, dicogamy (protandry) with entomophilic pollination.