Description of the Phytoplanktonic Community of the Oligotrophic Waters of the SE Aegean Sea (Mediterranean)
L. Ignatiades
National Research Center ‘Demokritos’, Aghia Paraskevi, Attiki, Greece.
Search for more papers by this authorD. Georgopoulos
National Centre for Marine Research, Aghios Kosmas, Hellenikon, Greece.
Search for more papers by this authorM. Karydis
Department of Environmental Studies, University of the Aegean, Mytilini, Greece.
Search for more papers by this authorL. Ignatiades
National Research Center ‘Demokritos’, Aghia Paraskevi, Attiki, Greece.
Search for more papers by this authorD. Georgopoulos
National Centre for Marine Research, Aghios Kosmas, Hellenikon, Greece.
Search for more papers by this authorM. Karydis
Department of Environmental Studies, University of the Aegean, Mytilini, Greece.
Search for more papers by this authorAbstract
Abstract. A seasonal sampling program of five stations off the Island of Rhodes (SE Aegean Sea) was carried out in 1983–1984. Temperature, salinity, Secchi disk transparency, P-PO4, N-NO3, N-NO2, N-NH3, Si-SiO2, and chl a were measured and phytoplankton species recorded. Cell concentrations and chl a varied seasonally. with the highest values in summer (l.2 times 104 -1--1 total mean cells; 0.13 mgam-3 total mean chl a) and the lowest in winter (2.3 times 103, 1--1 total mean cells; 0.06 mg.m-- total mean chl a). A variation in cell abundance among stations was also noted. Quantitative relationships among the recorded taxa showed that diatoms and dinoflagellates were richer in species composition (88 and 58 total species, respectively) than coccolithophores (8 species) and other flagellates (8 species). Comparison of phytoplankton samples from different depths and stations by cluster analysis showed an irregularity or discontinuity in species associations. The SE Aegean Sea was characterized as oligotrophic on the basis of the estimated nutrient and phytoplankton concentration levels.
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