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Diversity of freshwater red algae in Europe

Kwandrans J., Eloranta P.

Oceanological and Hydrobiological Studies

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2010

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Vol. 39, No.1

161-169

EN

Of the total number of freshwater red algae (ca. 180 taxa), one third are found in Europe (ca. 60 taxa). Over one third (24 taxa) of European taxa have been found at only one single location or at very few locations. The majority of taxa live in running waters, but some occur in lakes, on wet ground, in hot springs or in garden ponds. Diversity in the Nordic countries of Sweden and Finland seems to be somewhat higher (27 and 28 taxa, respectively) than in the central and southern parts of Europe (e.g. Austria 23, Belgium 22, Hungary 9, Poland 22, Slovakia 15, Switzerland 12 and Spain 20 taxa).

2

Indicator value of freshwater red algae in running waters for water quality assessment

Eloranta P., Kwandrans J.

Oceanological and Hydrobiological Studies

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2004

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Vol. 33, No. 1

47--54

EN

Freshwater red algae (Rhodophyta) occur mainly in running waters. They are generally indicators of good water quality (oligotrophic, oligosaprobic). Many of them are also included on lists of threatened algae. According to the literature, the range of occurrence of red algae at the group level is wide for current velocity, water conductivity and pH. At the genus level, some genera seem to prefer or need hard water and an alkaline environment (Compsopogon, Hildenbrandia, Thorea), whereas others prefer soft water (conductivity < 100 μS m-1). They may also occur in acid water (Audouinella, Batrachospermum, Lemanea, Sirodotia and Tuomeya). With the exception of those living in hard waters, most species also have a rather wide ecological tolerance as measured by common water quality variables. Trophic and saprobic classifications seem to depend rather on geographical conditions than on the real ecological preferences of red algal taxa.

3

The freshening history of a brackish water bay described by sediment diatoms

Eloranta P.

Oceanological Studies

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1999

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Vol. 28, No. 1-2

51-57

EN

The Luodonjarvi bay was cut off from the northern part of the Bothnian Bay (Baltic Sea) in 1962 by a dam to provide a supply of freshwater. The bay is fed by river water from small rivers. Monitoring results have indicated a rather fast (ca 2 years) change from brackish to freshwater. According to sediment diatom analyses, the process has lasted much longer. The northern part of the reservoir is affected by acid river waters, but some of the original brackish water is still there. The freshening process is described using different ecological groupings of diatoms.

4

Water blooms - what causes them?

Eloranta P.

Oceanological Studies

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1998

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Vol. 27, No. 1

15-19

EN

Water blooms are usually connected with cyanoprokaryote or algal mass occurrence, however, some other phenomena may also cause an intensive water colour in lakes. Common and characteristic water bloom is often brought about by mass oc-currence of tree pollens, abundant occurrence of fungal spores or, at deeper water layers, besides algae also some green or red sulphur bacteria. The most characteristic blooming algae belong to cyanoprokaryotes, but this phenomenon can be also caused by other taxa e.g. green algae, euglenophytes and chloromonads.