Novo registro de Trichodesmium thiebautii Gomont ex Gomont (Oscillatoriales - Cyanophyta) para a plataforma continental do Nordeste do Brasil

Abstract

This study reports the first occurrence of Trichodesmium thiebautii 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 (8°18'S - 34°56'W and 8°32'S - 35°00'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.