Microplankton abundance in the euphotic zone of the Aegean, Levantine and Ionian Seas in March-April 1987

Microplankton species composition analysis was performed according to the inverted microscope method of Utermoehl. Samples for identification and enumeration of larger phytoplankton cells (>5 µm) were preserved in alkaline Lugol solution. Utermoehl, H., 1958. Zur Vervollkommung der quantitativen Phytoplankton-Methodik. Mitt. Int. Ver. Theor. Angew. Limnol., 9:1-38.