Species composition, density and biomass of coccolithophorids in the Istanbul Strait, Turkey

Aktan Y. , Luglie A., Aykulu G., Sechi N.

PAKISTAN JOURNAL OF BOTANY, vol.35, no.1, pp.45-52, 2003 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 35 Issue: 1
  • Publication Date: 2003
  • Page Numbers: pp.45-52


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 in, 10 m), on the coast of Istanbul Strait, considering four different areas: Uskudar, Cengelkoy, 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 pattern.