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Sub-fossil chironomid assemblages (Diptera: Chironomidae) from the Cerne lake and Prasilske lake (Bohemian Forest, Czech Republic)

Sub-fossil chironomid assemblages (Diptera: Chironomidae) from the Cerne lake and Prasilske lake (Bohemian Forest, Czech Republic)

Silva Gabreta 4: 253-258

Chironomid thanatocenoses of the Ceme Lake and Prasilske Lake were studied. Sub-fossil material (head capsules) was obtained from the 19.5 cm long sediment cores taken in 1991. 372 sub-fossil remains were found and 17 taxa were identified from the core taken from the Cerne Lake. The sub-fossil record was dominated by Heterotrissocladius marcidus. Taxonomic composition indicates oligotrophic conditions without anoxic events in the profundal. Decrease of both the number of chironomid taxa and individuals from the bottom to the top of the core was observed. The most apparent changes were revealed at 6.5 - 8.0 cm. They corresponded with analysis of the sub-fossil diatoms and cladocerans. Acidification caused by air pollution is considered to be the most important force in the changes of the sub-fossil records. Not only low pH but high concentrations of Al and other trace metals might be responsible for the impoverishment of chironomid fauna. 315 head capsules were recovered and 22 chironomid taxa were identified from the sediment core of the Prasilske Lake. Taxonomic composition was indicative for warmer, more productive system in comparison with the Cerne Lake. Number of taxa and specimens from the bottom to the top of the core displayed similar pattern as was recognised in the Cerne Lake sediment record. Decrease of the head capsule numbers and disappearance of most taxa (including relatively acid sensitive Corynoneura and Pagastiella orophila) from 7.0 - 6.5 cm to the top of the core is probably a reflection of a progressive acidification stress. Chironomid fauna of the older sediments consisted of some rheophilic and hygropetric taxa that might be flushed into the lake from tributaries. They may indicate more pronounced influence of the inflows in the past. Pagastiella orophila (Edwards, 1929) and Heterotrissocladius grimshawi (Edwards, 1929) from the sub-fossil record of the Prasilske Lake have never been found recently in Czech Republic yet.

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