Abstract
Two populations of Cuphea melvilla Lind. (Lythraceae) occurring on hydromorphic soils on the edge of Panga's river gallery forest, in The Panga Ecological Station, Uberlândia-MG, were studied for many aspects of their floral and reproductive biology and their 2importance for the species of hummingbird identified in the area. Observations were carried out during over the flowering season of 1999 with periodic visits during the morning period and sometimes until the beginning of the afternoon. Field work effort varied between one to four visits per week during five months. Cuphea melvilla is a shrub species that shows morphological adaptation to hummingbird's pollination and a long flowering season that begins on the rain season and finish on the beginning of the dry season. This species is self-compatible forming fruits by cross-pollination and self-pollination but it is non-apomictic and need pollination to form fruits. Pheathornis pretrei, Amazilia fimbriata, Thalurania furcata, Eupetomena macroura and Chlorostilbon aureoventris (female) were the hummingbirds observed visiting the C. melvilla's flowers and all realized legitimate visits to the flowers. A. fimbriata and C. aureoventris (female) showed territorial behaviour but in different seasons whereas P. pretrei appears to be trapliner. Finally, T. furcata and E. macroura showed opportunistic behaviour
Highlights
The study was based on the botanic collections of the main herbaria from the Cerrado Biome
It consists of 2 chapters: l) Loranthaceae and Viscaceae synopsis representing the first studies of these families for the Cerrado Biome
Loranthaceae and Viscaceae showed patterns of geographic distribuition that vary from widely distributed species, in and out of the Cerrado Biome, to restricted endemics
Summary
Resumos impressos de acordo com os originais enviados pelas respectivas Coordenadorias de Pós-Graduação. No sedimento e nas folhas foram realizadas determinações dos teores de metais (Al, Fe, Mn, Cu, Pb, Zn, Cd e Cr), e de nutrientes (Na, K, Ca e Mg), através da espectrofotometria de absorção atômica, enquanto que o P foi determinado através de espectrofotometria visível. O teor de matéria orgânica e a relação C/N foi elevada, principalmente nas estações 1 e 2, provavelmente devido a forte influência dos efluentes orgânicos urbanos e industriais despejados pelo município. A folhas de Avicennia não apresentaram teores considerados elevados de Fe, Al, Mn, Cu, Zn, Cd e Cr. Entretanto, os teores de Pb foram bastante expressivos, podendo estar relacionado a absorção, associada a fixação desse elemento nas placas de ferro das raízes. RESUMO – O trabalho aborda a distribuição fitogeográfica dos gêneros Jacaranda e Tabebuia (Bignoniaceae) no Cerrado contínuo no Brasil Central.
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