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JPR Advance Access published online on August 18, 2007
Journal of Plankton Research, doi:10.1093/plankt/fbm067
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© The Author 2007. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Dense sub-ice bloom of dinoflagellates in the Baltic Sea, potentially limited by high pH

Kristian Spilling*

Finnish environment institute, P.O. Box 140, 00251 Helsinki, Finland and Tvärminne zoological station, 10900 hanko, Finland

* Corresponding author: kristian.spilling{at}ymparisto.fi

Received on February 27, 2007; revised on June 27, 2007; accepted on August 15, 2007


  Abstract

The phytoplankton community, carbon assimilation, chlorophyll a (Chl a), pH, light and attenuation and inorganic nutrients were monitored under the ice in the coastal Gulf of Finland, Baltic Sea. Maximum ice and snow thickness was 40 and 15 cm respectively. Freshwater influence had created a halocline 1-2 m below the ice-water interface, and above this halocline a dense bloom of dinoflagellates developed (max > 300 µg Chl a L–1). The photosynthetic activity use of nitrate also raises pH} of this ‘red tide’ bloom increased the pH to a maximum of 9.0. The sub-ice phytoplankton community was dominated by the dinoflagellate Woloszynskia halophila (max. 3.6 * 107 cells L–1). The pH tolerance of this species was studied in a monoculture and the results indicate that pH > 8.5 limits growth of this species at ambient irradiance. This study show that primary productivity may raise the pH to growth limiting levels, even in marine, low-light environments where pH normally is not considered important.

Key Words: pH • red tide • ice ecology • Dinophyceae • Baltic Sea

Communicating Editor: K.J. Flynn


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