Abstract
(With 2 figures)Blooms of dinoflagellates, mainly the genus Ceratium sp., have been observed in some freshwater ecosystems, as described in the works of Nakano et al. (1999), Ginkel et al. (2001), Santos-Wisnieswki et al. (2007), Matsumura-Tundisi et al. (2010), Moreira et al. (2015) and Almanza et al. (2016).It is important to note that, according to Lund (1965), the genus Ceratium sp. can be found in nutrient rich waters, especially phosphate and nitrate, and usually in association with cyanobacteria.Fieldwork, object of this study, was carried out on March 4
Highlights
Fieldwork, object of this study, was carried out on March 4th 2016, during the morning period, and the climatic conditions were rainy
On the fieldwork from the referred day, it was executed a vertical profile with the multiparameter probe YSI 6600 – V2 in the center of the lake as well as the collection of water samples with the support of Van Dorn bottle in the center and at the shore of the lake, in order to determine, in the laboratory, nitrate (NO3–) and ammonium (NH4+) parameters, according to APHA (1998), and total phosphorus, according to Valderrama (1981)
As a result of the vertical profile performed with the multiparameter probe in the center of the lake, low concentrations of dissolved oxygen were found in the layer below 6 meters deep (6m = 0.41 mg/L; 8m = 0.22 mg/L; 10m = 0.29 mg/L)
Summary
Object of this study, was carried out on March 4th 2016, during the morning period, and the climatic conditions were rainy. On the fieldwork from the referred day, it was executed a vertical profile with the multiparameter probe YSI 6600 – V2 in the center of the lake (depth of 10 meters) as well as the collection of water samples with the support of Van Dorn bottle in the center (including surface and bottom) and at the shore (only surface) of the lake, in order to determine, in the laboratory, nitrate (NO3–) and ammonium (NH4+) parameters, according to APHA (1998), and total phosphorus, according to Valderrama (1981).
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