PJB-2003-8
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.
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