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Structure and dynamics of the algal flora in subalpine mires in the Krkonoše Mountains (Giant Mountains; Czech Republic)

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The algal flora of the pools in a subalpine peatbog and its mineral-ground surroundings was examined. Although the water chemistry (pH, conductivity) seemed to be similar in most of the sampled waterbodies, both environments differed considerably both in the composition of the algal flora and in the number of species. Mineral-ground pools had a more diversified algal flora and were especially rich in diatoms.

Three microbiotopes were sampled in all pools: plankton, benthos and metaphyton. Plankton assemblages were the lowest both in the number of species and in their abundance, and their composition varied considerably due to weather changes. Most of the cyanobacteria, diatoms (except the genus Eunotia), euglenophytes, green coccoids and biradiate desmids preferred living in benthos. Metaphyton was preferred by epiphytic species, omniradiate and polyradiate desmids, and cryptophytes and other flagellates living also in the plankton.

Seasonal succession, as typical in lakes or ponds, was not observed. The algal flora in the studied pools was subject to short-term fluctuations. However, in spite of the species variations due to weather changes, the differences in total numbers of taxa during the course of year were insignificant. Among the species which displayed noticeable seasonal dynamics a decrease of the population during the summer was the most frequent pattern. This likely corresponds with the psychrophilic character of these species and the arcto-alpine character of the whole local algal flora.
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Document Type: Research Article

Publication date: May 1, 2007

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  • Nova Hedwigia is an international journal publishing original, peer-reviewed papers on current issues of taxonomy, morphology, ultrastructure and ecology of all groups of cryptogamic plants, including cyanophytes/cyanobacteria and fungi. The half-tone plates in Nova Hedwigia are known for their high quality, which makes them especially suitable for the reproduction of photomicrographs and scanning and transmission electron micrographs.
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