2014-03-252014-03-252009-12SOUSA, Eliane Brabo de et al. Variação temporal do fitoplâncton e dos parâmetros hidrológicos da zona de arrebentação da Ilha Canela (Bragança, Pará, Brasil). Acta Botanica Brasilica, online, v. 23, n. 4, p. 1084-1095, dez. 2009. DOI: http://dx.doi.org/10.1590/S0102-33062009000400018. Disponível em: http://repositorio.ufpa.br/jspui/handle/2011/4830. Acesso em:.0102-3306https://repositorio.ufpa.br/handle/2011/4830Seasonal and nyctemeral variations of the phytoplankton and hydrological parameters were studied at a fixed station (00º46'37.2"S-046º43'24.5"W) situated in Canela Island (Bragança-Pará) in September and December, 2004 and in March and June, 2005. Subsurface water samples were taken for qualitative and quantitative phytoplankton studies and to determine chlorophyll a concentrations. Simultaneously physical and chemical parameters were measured: salinity, temperature, pH, dissolved oxygen and percent of oxygen saturation. A total of 64 taxa belonging to Cyanophyta (one taxon), Bacillariophyta (54 taxa) and Dinophyta (nine taxa) were identified. Chlorophyll a concentrations ranged from 4.67 mg m-3 (dry season), to 5.44 mg m-3 (rainy season) and follow phytoplankton densities, which were higher during the rainy period (mean values of 1,870 x 103 cell L-1). Phytoflagellates quantitatively dominated the local phytoplanktonic community followed by diatoms. Dimeregramma minor and Skeletonema sp. were abundant and veAcesso Abertohttp://creativecommons.org/licenses/by-nc-nd/3.0/br/PlânctonComposiçãoBiomassaDensidadeCosta amazônicaPlanktonCompositionBiomassDensityAmazon coastArtigo de Periódico10.1590/S0102-33062009000400018