Abstract
The aim of the current study is to feature the composition, frequency and richness of cyanobacteria species and their spatial-temporal distribution patterns in Curiaú River. Quarterly collections were carried out at three sampling sites, from June 2016 to October 2017. Phytoplankton and periphyton samples were collected and fixed with Transeau’s solution to be identified under optical microscope. Data were statistically treated through descriptive, variance and cluster analyses; significance level was set at p<0.05. In total, 17 taxa were identified and grouped into four (4) taxonomic orders, namely: Chroococcales, Nostocales, Synechococcales and, most prevalently, Oscillatoriales. Genera Kamptonema (67%) and Phormidium (44%) were the most frequent taxa. Cyanobacteria richness has shown significant variations (p<0.05) among sampling sites. This pattern was not observed for seasonal fluctuations (p> 0.05). These data also represent pioneering information about cyanobacteria biodiversity in Amapá State.
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