“…Helicosphaera spp. is known to preferentially high productivity waters in the middle photic zone Crudeli et al, 2006). In this study, the genus Helicosphaera is represented mainly by H. carteri, a species with preference in warm waters (Brand, 1994;Baumann et al, 2005) and moderately elevated nutrient levels (Findlay and Giraudeau, 2000;Andruleit and Rogalla, 2002;Ziveri et al, 2004).…”