Biologia reprodutiva de uma comunidade de Campo Sujo, Uberlandia/MG

AUTOR(ES)
DATA DE PUBLICAÇÃO

1997

RESUMO

A community levei approach of reproductive biology studies is still rare for the neotropical savanna vegetation. ln order to address this subject an open cerrado area, with predominancy of herbs and shrubs was chosen in the Ecological Station of Panga, located 40 Km from the town centre of Uberlândia, MG. Phytossociological and floristic surveys were performed on 5 plots of 10m X 70 m in which ali plant individuaIs were identified and registered on the HUFU herbarium. During the period of January/1992 to September/1993 phenological and reproductive biological data were record for the sampled areas, including observations on the morphology, floral events, pollinators, sexual and breeding systems. The effect of a natural fire which burned the area in 1992 was evaluated on both tloristic composition and floral biology. The survey included 204 species belollging to 47 families, among which Asteraceae and Fabaceae were predominant in species number. The composition of species was modified after the fire occurrellce, and was accompanied by a decrease on species number. Phenological evellts of flowering and frutification although occurring along the entire year, were restricted for most species to the rainy station. Such seasonality reflects the prevalence of herbs and shrubs, which present a short life cycle and strong dependency on soil moisture conditions. The commonest pattern offloral biology for the community includes flowers with the following characteristics: small open forms, actinomorphic with pale colors and undetected aroma, presenting erect position of insertion, diurnal antesis, having nectar as floral reward and individual flowers as pollination unities. Pollination systems were diversified, but involving preferentially bees as agent of pollination. The majority of species were hermaphrodite and selfcompatible

ASSUNTO(S)

cerrados fenologia plantas - reprodução

ACESSO AO ARTIGO

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