Sucesso reprodutivo de Byrsonima Crassa Nied. (Malpighiaceae) em um fragmento de cerrado Sensu Strictu no campus da Universidade Estadual de Goiás, Anápolis, Goiás, Brasil

Abstract

Reproduction is a fundamental step for the maintenance of life on Earth and the evolutionary point of view sexual reproduction allows an increase in the variability among individuals of the same species. In Cerrado species of the Byrsonima are very common, and popularly known as muricis was defined in this study area, as xenogamous optional demonstrating yet certain degree of self-compatibility. The pollinator activity may reduce inbreeding depression. The objective of this study was to analyze biotic and abiotic factors that may interfere with the reproductive success of Byrsonima crassa Nied. The study was conducted between the months of July 2011 to September 2012 and 14 focal individuals were marked. The viability was found to be 92.65 ± 4.54%, lower than that seen in other studies with the same species and 59% of the buttons turned flowers and 61% of the flowers turned into fruit. The density observed for the species under study was considered low and there was no relationship between the density and the number of fruit set (r = - 0.2571, p = 0.5042). This can occur as a result of greater competition among pollinators. There were no individuals being herbivorados and reproductive success for interpopulational crosses was greater than that observed for the crossings intrapopulational. The Tukey test performed with the mean formations of fruits showed that only significant difference between the control group and the crosses made between populations (difference between the mean of 2.8154 with p <0.05). We verified a reproductive efficiency of 0.63, indicating a high possibility of this kind of form fruit. Besides the density, herbivory was not checked as an influence on the success of this species, noting that the present study found high reproductive success, since its value approached the reproductive efficiency, showing that the species reproduces at its next limit.