Eutrophication is a natural process of evolution in aquatic ecosystems. This phenomenon occurs due to the entry of nutrients into the system, especially the more restrictive as phosphorus and nitrogen. However, the man accelerates this process through the use and occupation of the watershed. Note that eutrophication is considered a problem on a global scale, being considered as one of the most relevant types of degradation of aquatic environments. In this context, the lagoon of Bateias receives high nutrient contributions due to the release of domestic and industrial waste from the city of Vit�ria da Conquista, Bahia-Brazil. In this sense, the present work aimed to evaluate the spatial and temporal trophic state of the lagoon Bateias. We used the trophic state index of Carlson (1977) as amended by Toledo Jr (1983) to lentic environments located in the tropics. The samples were collected and analyzed for the four seasons (spring, summer, fall and winter) in 2013. Thus, it was found that the trophic ranged from mesotrophic to hypereutrophic for different periods of analysis. However when analyzing the monthly average for each collection time was noted that the predominant trophic level was hypereutrophic, being considered the last degree of eutrophication. It was found that all samples exceeded the water quality standard for total phosphorus established by the National Council on the Environment (CONAMA) 357/2005, which is 50 mg L-1 for lentic environment, class 3. This aspect can be associated with the release of domestic and industrial effluents 'in natura' in that water body. It can be inferred that the Lagoon Bateias framed on a serious level of eutrophication, affecting multiple uses of lentic environment. Therefore, there is a need for urgent measures to softn the advanced stage of eutrophication detected in this pond.

Spatial and temporal assessment of the trophic state of the lagoon Bateias in Vit�ria da Conquista, Bahia-Brazil

248th National Meeting (2014)

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