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SPECIES COMPOSITION, DENSITY AND BIOMASS OF COCCOLITHOPHORIDS IN THE ISTANBUL STRAIT, TURKEY

YELDA AKTAN ^*, ANTONELLA LUGLIE² , GÜLER AYKULU ¹ AND NICOLA SECHI ²

Abstract: A first report of the coccolithophorid flora in the phytoplankton of the Istanbul Strait is presented in this paper. Samples were taken with a Nansen bottle at three depths (surface, -5 m, -10 m), on the coast of Istanbul Strait, considering four different areas: Üsküdar, Çengelköy, Kanlica and Beykoz during May 97 and August 1998. Density, biomass and total phytoplankton chlorophyll a content were calculated. During the study period, some physical and chemical parameters were measured. A total of five species of coccolithophorids were observed at sites, however considerable differences were observed in the seasonal fluctuations of density and biomass. A bloom was observed during May 1997. Calyptrosphaera species was the most dominated species followed by Anacanthoica acanthos (Shiller) Deflandre. Biomass, quantified as biovolume, showed a well-defined seasonal patterntransferred to the field with 100% survival rate.
 

Istanbul University, Fisheries Faculty, Ordu Cad. No:200 Laleli, 34470, Istanbul, Turkey.
Istanbul University, Fisheries Faculty, Ordu Cad. No:200 Laleli, 34470, Istanbul, Turkey.
Department of Botany and Plant Ecology, University of Sassari, Via Muroni 25-07100 Sassari, Italy.
Corresponding Author: yaktan@istanbul.edu.tr