Acessibilidade / Reportar erro

Metaphyton, benthos and phytoplantonic communities in lentic systems in the region of Charqueadas Rio Grande do Sul, Brazil

Metaphyton, benthos and phytoplanktonic communities occurring in lentic systems were studied in July and August 1986. The study was based on 46 samples collected in Charqueadas and other neighboring areas in the State of Rio Grande do Sul, a region which suffers the effects of coal mining and processing. Out of the 213 specific and infraspecific taxa identified, 95 are a first record in the State of Rio Grande do Sul. As far as the number of occurring species is concerned, the best represented groups were Chlorophyta (Desmids) and Bacillariophyta (Diatoms). Organisms indicative of acid systems were found, mostly in benthos and metaphyton environments subject to the influence of coal wastes. In these acid systems, phytoplankton showed nanoplanktonic organisms of the group Chrysophyceae; Euglenophyta, Bacillariophyta and Chlorophyta were all well represented in the metaphyton and benthos. The structure of the phytoplanktonic communites showed low diversity, which suggests an unbalanced composition.

Phytoplankton; Metaphyton; Benthos; Acid lentic systems; Rio Grande do Sul State


Sociedade Botânica do Brasil SCLN 307 - Bloco B - Sala 218 - Ed. Constrol Center Asa Norte CEP: 70746-520 Brasília/DF. - Alta Floresta - MT - Brazil
E-mail: acta@botanica.org.br