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Seasonal variations in the phytoplankton community in the north-eastern Sea of Marmara and a species list

Published online by Cambridge University Press:  20 January 2009

Niyazi Deniz  and
Seyfettin Taş
Niyazi Deniz*
Affiliation:
Istanbul University, Institute of Marine Sciences and Management, 34470, Muskule Street, No. 1, Vefa, Istanbul, Turkey
Seyfettin Taş
Affiliation:
Istanbul University, Institute of Marine Sciences and Management, 34470, Muskule Street, No. 1, Vefa, Istanbul, Turkey
*
Correspondence should be addressed to: N. Deniz, Istanbul University, Institute of Marine Sciences and Management, 34470, Muskule Street, No. 1, Vefa, Istanbul, Turkey email: niyazideniz@hotmail.com
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Abstract

This paper describes phytoplankton abundance data collected in the Sea of Marmara in 2000 and identifies new species to the region. The quantitative sampling was carried out monthly at 3 stations and seasonally at 6 stations at depths of 0.5, 5, 10 and 20 m. Additionally, vertical samplings by plankton net from 15–0 m were carried out in order to determine the species diversity. Simultaneously measured physical (salinity, temperature and Secchi disc) and chemical parameters (dissolved oxygen, nitrate + nitrite, chlorophyll-a, phosphate and silicate) were evaluated together with phytoplankton data. One hundred and fifteen species were recorded which are members of 55 dinoflagellates, 42 diatoms, 11 silicoflagellates and 7 other groups. Those species include toxic species with high reproduction rates and species that are accepted as carrying risk. Blooms of Anabaena sp., Nitzschia longissima (Brébisson in Kützing) Ralfs in Pritchard and Prorocentrum triestinum Schiller species were observed during the study. Dictyocha antarctica Lohmann 1919, Dictyocha crux Ehrenberg 1840 and Nitzschia rectilonga Takano 1983 species were recorded for the first time from the coastal waters of Turkey. The maximum phytoplankton abundance has been observed during the winter and autumn seasons in the 0.5 and 5 m depths; the concentration of the diatoms was higher during late winter and autumn, however, the concentration of the dinoflagellates was always high during the whole year and they did not show a seasonal variation. The phytoplankton density was lower at the 20 m depths because of the low light penetration property of the Sea of Marmara.

Keywords

phytoplanktonthe Sea of Marmaraeutrophicationtoxic microalgae
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 89 , Issue 2 , March 2009 , pp. 269 - 276
Copyright
Copyright © Marine Biological Association of the United Kingdom 2009

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