Richness and distribution of aquatic macrophytes in a subtropical reservoir in São Paulo, Brazil.

Ana Carolina Pavão, Flavia Bottino, Roseli Frederigi Benassi, Maria do Carmo Calijuri, André Cordeiro Alves Dos Santos

Resumo


Aquatic macrophytes are one of the most important and diverse communities in tropical aquatic ecosystems. Objective: Contribute to the understanding of macrophyte dynamics in subtropical reservoirs, Methods: samples were collected at 12 points in two seasons (summer and winter) in the Itupararanga Reservoir, in the Rio Sorocaba Sub-Basin of the Tiete-Parana Basin. This reservoir is undergoing a continuous process of eutrophication, is the most important in the region, and supplies around one million inhabitants. Results: the greatest macrophyte richness and biomass was observed in the headwaters of the reservoir, the most eutrophic and impacted region. Sixteen species were found, most of which (75%) were emergent. Echornia crassipes Mart. and Solms, 1883, Polygonum sp. and Urochloa sp. were the most frequently occurring taxa and had the highest biomass. Conclusion: while there was no significant variation in the total biomass of the macrophytes between the two periods, E. crassipes and Salvinia sp. were more abundant in winter and Urochloa sp. was more abundant in the summer. The slight variation in water levels and the higher bank were the main variables responsible for the differences in richness in the two periods.


Palavras-chave


Itupararanga Reservoir; Biodiversity; seasonable variability



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