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2 Oceanological and Hydrobiological Studies

2 2004

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Phytoplankton characterisitcs for different types of Estonian rivers

Piirsoo K., Pall P., Viik M.

Oceanological and Hydrobiological Studies

2004

Vol. 33, No. 1

23--35

The following phytoplankton characteristics and parameters were studied for different ecological types of river reaches: biomass (PB, mg l-1); abundance (PA, ×106 cells l-1); number of taxa per quantitative sample (PT); Nygaard's phytoplankton compound quotient (PCQ); phytoplankton dominants (PD). The quantitative characteristics of phytoplankton (species richness, abundance, biomass and PCQ) revealed an increasing trend from small to large upstream catchment areas, but did not respond to different river bedrock or flow velocity. Additionally, PCQ was the highest for the class of 'good' water quality. The phytoplankton dominants were not suitable for typology in the case of small streams where species composition was heterogeneous, without a welldeveloped phytoplankton community.

Diatom indices and stream typology in Estonia

Vilbaste S., Järvekülg R., Pall P., Piirsoo K., Trei T., Viik M.

Oceanological and Hydrobiological Studies

2004

Vol. 33, No. 1

3--10

This paper deals with the use of diatom indices in the assessment of streams in Estonia. The problem addressed is how rational it is to determine different types of streams or stream reaches based on diatom research. At the moment, there are five different typologies of running waters in Estonia, two of which are analyzed here. Diatom indices can be employed to assess the ecological quality of water but not the status or type of stream. The most promising diatom indices for such assessment are the Trophic Diatom Index, Watanabe Index, Descy Index, and Schiefele & Schreiner Index.