SS3.16 Lentic-Lotic Linkages in Freshwaters: Comparisons from Different Ecosystems
Date: Thursday, June 13, 2002
Location: Poster Session - VCC
 
AlbertRL, Environmental Change Research Unit (ECRU), Div. of Hydrobiology, Dep. of Ecology and Systematics, P.O. Box 65, FIN-00014 University of Helsinki, Finland, Raino-Lars.Albert@helsinki.fi
 
DIATOM COMMUNITIES OF DIFFERENT HABITATS IN THREE MOUNTAIN BROOKS AT SUBARCTIC LAKE SAANAJÄRVI, FINNISH LAPLAND
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Three mountain brooks in the catchment of the subarctic Lake Saanajärvi in NW Finnish Lapland (69°03'N, 20°52'E) were chosen for a master's thesis study. The aim of the study was to identify the diatom communities characteristic of different habitats and to examine their seasonal variability. Epilithic, epipsammic and epibryic diatom samples as well as water samples for monitoring physical and chemical parameters were taken every two weeks from seven sampling stations during the open water season from July to October 2000. Until now only the epibryic fraction has been analysed; preliminary results show that no substantial seasonal change occured in species proportions within the diatom communities. In contrast, multivariate analyses arranged the studied brooks into three distinct groups explained by abiotic factors. The studied brooks flow in the treeless tundra and empty into Lake Saanajärvi. Therefore, the results will also be compared to available diatom data from epilithic and sediment samples of this lake.