Periphytic algae in distinct environments of the upper Paraná river floodplain - DOI: 10.4025/actascibiolsci.v28i3.216

Abstract

This paper analyses the structure and dynamic of the periphytic algae community in three systems in the Paraná river floodplain (Guaraná lagoon, Fechada lagoon and Baía river), in two hydrologic periods (high waters and low waters) in 2003. Utilized substratum was Eichhornia azurea Kunth. There were found a total of 284, 193 in high waters and 172 in low waters periods. The Guaraná lagoon presented the largest richness in both hydrologic periods. The high waters period (March) had larger density of cyanobacteria. The low waters period (September) had larger occurrence of diatoms. The limnological characteristics (mainly dissolved oxygen, orthophosphate and nitrogen forms) were influenced by hydrologic level and hydrodynamics characteristics, which interfered in presence, abundance, and distribution of the algae in the system.