Original paper

Desmids of phytotelm terrestrial bromeliads from the National Park of "Restinga de Jurubatiba", Southeast Brasil

da Graça Sophia, Maria; Carmo, Bruno Pedrosa; de Moraes Huszar, Vera Lúcia


The scarcity of data on the flora of phytotelmic environments - natural aquatic microecosystems, formed by vegetable structures - motivated the present study, the objective of which was conducting an inventory of desmids, a group of green algae (Zygnematophyceae) with a focus on a number of ecological aspects. The research was based on 13 excursions (March, 1995-November, 1997) in two areas of the Parque Nacional da Restinga de Jurubatiba, Município de Carapebus, Rio de Janeiro. Algae from the phytotelms of two species of bromeliads, both exposed to the sunlight and to the shade, were sampled, and a number of abiotic variables were measured (temperature, pH, and electric conductivity of water). The Zygnematophyceae was the dominant class, with 13 representatives, that are the first citations for the State and for the country. The results have shown that exposure to the sun and the shape of the reservoir determined the abundance of desmids, which was associated with the water acidity in the bromeliad phytotelms.