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The Comacchio lagoonal system has been affected for years by a persistent phytoplanktonic bloom which makes the waters greenish. Surveys carried out from April 1995 to February 1996 showed that this bloom was caused by a  Synechococcus  sp. and by an Eustigmatophycean belonging to the genus  Nannochloropsis . However, while the  Synechococcus  sp. was mainly present in the summer,  Nannochloropsis  was always present with constant density values. Moreover, this species shows many ultrastructural features and a pigment composition similar to those of  Nannochloropsis  spp. and reproduces by autospores. The 18S rRNA gene sequence of this strain is identical to those of five strains of  Nannochloropsis gaditana . In this paper, besides phytoplankton (including picophytoplankton), we also report the data of the main chemico-physical parameters. Among them, the salinity and nutrient values showed an anomalous seasonal trend.

A Survey on a Persistent Greenish Bloom in the Comacchio Lagoons (Ferrara, Italy)