Field and culture studies on the ecophysiology of the toxic dinoflagellate Alexandrium minutum (Halim) present in Greek coastal waters

摘要

In Greek coastal waters, the toxic dinoflagellate Alexandrium minutum (strain AJ879163) was detected for the first time in spring 2002. This species proliferated during spring-summer of 2002 and 2003 over a wide geographic range along the north-south Aegean Sea coastline, mostly at low concentrations (average: 10~2 - 10~3 cells L~(-1)) with one exception of higher abundance (average: 10~5 cells L~(-1)). This study presents data on environmental (temperature, salinity, chl α, nutrients) and ecological (phytoplankton species composition, diversity, taxa dominance, community dissimilarities) parameters in the areas of A. minutum occurrence. A. minutum was isolated and grown in batch cultures used in a series of bioassay experiments for determination of its pigment composition by HPLC, half saturation constants (K_s) for nitrogen and phosphorus, and its response to different nitrogen to phosphorus (N:P) ratios.