This study reports the first occurrence of Trichodesmiumthiebautii Gomont ex Gomont on the coast of northeastern Brazil. Samples were gathered during the rainy season (July 2005) and the dry season (November 2006) at six stations distributed along two perpendicular profiles of the coast of Pernambuco (8º18'S - 34º56'W and 8º32'S - 35º00'W). T. thiebautii was found during both periods of the year and at the six collection stations, forming colonies in the form of clusters or more rarely, bundles, with straight cylindrical trichomes, quadratic or slightly longer cells, with widths between 5-10 µm and heights of 3-15 µm. The hydrological variables presented small variations, contributing to wide distribution of the species.
Studies about Trichodesmium thiebautii Gomont ex Gomont and the relations of its spatial and temporal distribution with the hydrological conditions were developed in the continental shelf of the coast of Pernambuco, Brazil. The samples were collected during the rainy (July 2005) and the dry (November 2006) seasons, on the surface and bottom, at six sampling points, distributed along two profiles perpendicular to the coast of Gaibú and Serrambi beaches. The collection points were approximately 5, 10 and 20 miles from the coast, corresponding to the isobaths of 10, 20 and 30 meters. T. thiebautii occurred in bothl periods, with less density in areas closer to the coast and higher further from the coast. The correlation of T. thiebautii was positive with pH and dissolved oxygen during the rainy season and with salinity and dissolved oxygen during the dry season. No correlation was observed with the nutrient salts.
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