Abstract
Under natural conditions, estuarine environments exhibit temporal and spatial variability in response to intense physical oscillations of tides and freshwater discharge. Various interactions occur between these physical forces, the resident biota, and surrounding human populations. Therefore, the study of estuaries must consider multiple factors, from aesthetic and sanitary to trophic. To reduce anthropogenic impacts on an estuary, measures must be taken to evaluate its trophic state and to describe its biotic and abiotic relationships. This study applied the Trophic State Index (TSI) and Trophic Index (TRIX) to identify alterations and their possible origins in the waters of the Muriá creek, Curuçá municipality, Pará, Brazil in 2015. The results reflect the typical seasonality of the region. The TSI and TRIX indexes show that Muriá creek is naturally susceptible to eutrophication due to its hydrologic characteristics and diffuse sources of pollution. The combined indexes approach is considered satisfactory because each index provides unique and complementary information. Both indexes use simple methodology and are easy to apply, which allows for efficient monitoring with a rapid response time.
Published Version
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