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ICES Journal of Marine Science: Journal du Conseil 1998 55(4):767-774; doi:10.1006/jmsc.1998.0398
© 1998 by ICES/CIEM International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer
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Proportion of copepod biomass declines with decreasing salinity in the Baltic Sea

I. Vuorinen, J. Hänninen, M. Viitasalo, U. Helminen and H. Kuosa

Archipelago Research Institute, University of Turku FIN-20 014
Department of Ecology and Systematics, Division of Hydrobiology, University of Helsinki P.O. Box 17, FIN-00 014, Helsinki
Finnish Institute of Marine Research P.O. Box 33, FIN-00 931, Helsinki, Finland

Correspondence to J. Hänninen: e-mail: jari.hanninen{at}utu.fi

The biomass ratio of copepoda/cladocera decreased in the Northern Baltic Archipelago Sea (SW Finland) in concert with a decrease in the seawater salinity during the 1980s. There also was an increase in freshwater run-off from the watershed of the Baltic Proper. Seawater salinity correlated negatively with freshwater run-off with a time lag of several years. The abundance percentages of most dominant zooplankton species correlated significantly with salinity, either positively (large neritic copepods), or negatively (freshwater cladocerans). All data sets together indicate a close connection between the functioning of the pelagic Baltic Sea ecosystem and large-scale weather patterns over the run-off area.

Keywords: Baltic Sea, freshwater run-off, salinity, time series, zooplankton


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