Abstract
The present study aims to assess the structural attributes of the periphytic algal community in shallow mesotrophic reservoir, in order to identify the main environmental factors regulating the temporal variability of structural attributes in a natural substrate (Ninféias Lake, PEFI, São Paulo). This study will contribute information to the project "Influence of spatial heterogeneity on the structure and nutrient status (C, N, P) of periphyton, phytoplankton and metaphyton in the Ninféias Lake (PEFI, São Paulo)" (FAPESP: 2009/52253-4) recently completed. This proposal will contribute to the identification of species descriptors, diversity and species richness of periphytic algal in Eleocharis R. Br., because among the natural substrates only this genus has not been studied. The water samples were taken within macrophyte stand to determine the physical and chemical variables in four seasons, which were concomitant periphyton sampling. To better understand the seasonal variation of algal communities in aquatic macrophyte will be jointly analyzed climatic variables (rainfall, air temperature and solar radiation) and the physical and chemical variables of water (transparency, radiation, temperature, conductivity, dissolved oxygen, alkalinity, pH, total and dissolved nutrients). Periphyton community will be analyzed by species composition (qualitative analysis), species density, species descriptors, biological indices (diversity, dominance, evenness) and classified into functional groups of periphytic algae. Overall, the study may contribute to the understanding of community structure of periphytic algae in natural substrate in shallow tropical reservoir.
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