| 總結: | (Occurrence of Ceratium furcoides (Levander) Langhans 1925 (Dinophyceae: Ceratiaceae) in Two Reservoirs of the Capibaribe Watershed Located in Semiarid Region). This study reported the first occurrence of Ceratium furcoides (Levander) Langhans 1925 species in two eutrophic in the Capibaribe river basin (Pernambuco-Brazil), located in semiarid region. Fortnightly, samples were collected in the sub-surface reservoirs. The following abiotic variables were analyzed: pH, apparent color, turbidity, conductivity, total hardness, chlorides, ammonia, nitrate, nitrite, inorganic phosphate, iron, copper, manganese and zinc. Phytoplankton biomass was quantified through its density. C. furcoides occurred in 17% of the samples in both reservoirs, and also presented high biomass (2.14 mm3.L-1 in Jucazinho and 4.04 mm3.L-1 in Toritama). The studied reservoirs are eutrophic and showed high concentrations of nutrients, particularly nitrite, as well as high conductivity and total hardness values.
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