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- W2289905762 abstract "Extensive fish mortality occurs occasionally in the Pantanal wetland and the phenomenon is called dequada by local inhabitants. The phenomenon originates by deterioration water quality in rivers and lakes, and the depletion of dissolved oxygen (DO) is the major indicator. Researches have shown that dequada occurs when DO reaches values lower than 3 mg/L. In addition, the duration of these low DO values determines the intensity of fish mortality. This paper presents a proposed classification of dequada event, using water quality data for Pantanal rivers surveyed by National Agency of Water (ANA). The proposed method has qualitative and quantitative bases and utilizes mean DO value and duration of these values, based on historical series of DO measurements. The results are compared to other studies of the dequada phenomenon, showing that the method is efficient to determine locales with higher probability of dequada. The Paraguay River has displayed highest dequada intensity. The rivers with narrower floodplains, such as Piquiri River, do not have dequada or the intensity is lower. The phenomenon is shown to be linked to basin hydrological conditions." @default.
- W2289905762 created "2016-06-24" @default.
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- W2289905762 date "2015-01-01" @default.
- W2289905762 modified "2023-10-02" @default.
- W2289905762 title "Methodology for analysis of distribution and classification of the intensity of dequada fish kill events in the Pantanal wetland" @default.
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