Title: Silicon Load and the Development of Diatoms in Three River-Lake Systems in Countries Surrounding the Baltic Sea
Authors: NOGES PEETERNOGES TIINAADRIAN RitaWEYHENMEYER Gesa
Citation: HYDROBIOLOGIA vol. 599 no. 1 p. 67-76
Publisher: SPRINGER
Publication Year: 2008
JRC Publication N°: JRC35016
ISSN: 0018-8158
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC35016
DOI: 10.1007/s10750-007-9194-y
Type: Articles in Journals
Abstract: We studied coherence in dissolved silicon loads from rivers into lakes, the development of diatoms in lakes, and the role of climatic forcing on the Si cycle in three river-lake systems in Sweden, Estonia, and Germany. We found coherent seasonality in the silicon loads of the two northern rivers, which was probably caused by the common snow type hydrology of the catchments as compared to the rain type hydrology of the catchment further south. The coherence of the studied Si-related variables between lakes was rather based on similarities in lake morphometry than on the climatic region. Among measured variables at the three sites, river water discharge responded most coherently to climatic forcing as synchronized by the North Atlantic Oscillation winter index (NAOw). Water discharge and Si load as strongly linked variables, showed coherent pattern among the river systems. We found significant seasonal specific correlations of the NAOw either with the biomass or the share of diatoms for each lake but no coherent pattern among the lakes. Our results indicate that water discharge driven processes are more coherent across regions than are lake-internal processes.
JRC Institute:Institute for Environment and Sustainability

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