ANNUAL DYNAMICS OF INDICATORS OF ABUDANCE (CELLS/ML) FOR SOME OF THE TOXIC ALGAE WHICH ARE PRESENT IN INPHYTOPLANKTON IN THE LAGOON OF NARTA

During 2014 in the lagoon of Narta (Vlore) was studied species resource composition and features of seasonal abundance dynamics (cells/ml) for three classes of potentially toxic phytoplankton (Dinophyceae, Bacillariophyceae and Dictyochophyceae) which are components of this basin biocenoses. Taxonomic classification proved the existence of 9 dinoflagelate algae species, 5 types of diatoms and 1 silikoflagelate. Dinoflagelate Alexandrium tamarense create dense populations, with a monthly average abundances of NM=654.2 cells/ml. Among diatoms greater density we found for Pseudo-nitzschia seriata (NM=654.2 cells/ml). Dinoflagelates create the dense population in the period from April to June (NM=3560 cells/ml), while for diatoms higher value of abundances is listed in the periods from January to March and November to December (NM=1530 cells/ml ). Change seasonal abundance values, for two large groups of plankton algae present in the lagoon of Narta, had favored alternating dominance typical species, creating situations to the presence of potentially toxic algae in every season.