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ICES Journal of Marine Science: Journal du Conseil 2003 60(2):177-186; doi:10.1016/S1054-3139(02)00280-1
© 2003 by ICES/CIEM International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer
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Phytoplankton trends in the Baltic Sea

N. Wasmunda,* and S. Uhligb

a Baltic Sea Research Institute Seestrasse 15, D-18119 Rostock-Warnemünde, Germany
b Quo Data Quality Management and Statistics Ltd Siedlerweg 20, D-01465 Dresden-Langebrück, Germany

*Correspondence to N. Wasmund; tel: +49 381 5197 212; fax: +49 381 5197 440. e-mail: wasmund{at}io-warnemuende.de; uhlig{at}quodata.de.

Monitoring data of phytoplankton abundance and biomass (1979–1999) and Chl. a (1979–2000) from surface samples (0–10 m) of the Kattegat, Belt Sea and Baltic proper were investigated for long-term trends. The Mann–Kendall test as well as the LOESS smoother was applied for three taxonomic groups in spring, summer and autumn separately. Chl. a trends were analysed by linear regression. Downward trends were found for diatoms in spring and summer whereas dinoflagellates generally increased in the Baltic proper but decreased in the Kattegat. In autumn, diatoms increased at some stations. For cyanobacteria, downward trends were detected mainly in the Kattegat/Belt Sea area. Chl. a concentrations showed a general decrease in the Kattegat/Belt Sea area but an increase in the Baltic proper. Observed changes in trends during the two decades might indicate shifts in the ecosystem.

Keywords: Baltic sea, chlorophyll, cyanobacteria, diatoms, dinoflagellates, LOESS smoother, long-term changes, Mann–Kendall

Received 2 May 2002; revision received 21 November 2002; accepted 26 November 2002.


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