Seasonal characterization of the estuarine water system of the Caeté (Bragança-PA)
DOI:
https://doi.org/10.20950/1678-2305.2016v42n4p844Keywords:
nutrients, chlorophyll-a, rainfallAbstract
The effect of Spring tides on the physical, chemical and biological quality of tidal water channels (called furos) was investigated, taking into account the regional seasonality and the spatial distribution of the Furo do Taici and the Furo da Estiva in the estuary of the Caeté. The abiotic variables were determined in situ during the diurnal cycle of the tide. The nutrients and chlorophyll-a were determined spectrophotometrically. In the Taici, there was a significant increase in salinity (18.57 ± 2.78) and in nitrite (12.93 ± 7,92μM) in the dry season, while in the rainy season, high turbidity (> 900UNT) and chlorophyll-a (12.09 ± 5,72μg L-1) were recorded. In the Estiva, the values of salinity were different â€"¹â€"¹in the dry season (36.20 ± 0.90) and in the rainy season (23.23 ± 6.19). When there was flooding, pH (7.72 ± 0.18) and dissolved oxygen (6.62 ± 0.54 mg L-1) were recorded which were higher than those of the ebb tide. The temperature (29.26 ± 1.08°C), phosphate (1.73 ± 1,43μM) and chlorophyll-a (33.6 ± 14,74 μg L-1) had higher values â€"¹â€"¹during the ebb tide. Coastal waters had an influence on the Furo da Estiva and the waters of the Furo do Taici were influenced by drainage from the mangrove.
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