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Recent and subfossil chironomids as a tool for tracing of environmental changes in mountain lakes of glacial origin
Tátosová, Jolana ; Stuchlík, Evžen (advisor) ; Šporka, Ferdinand (referee) ; Brabec, Karel (referee)
JOLANA TÁTOSOVÁ, Charles University in Prague Ph.D. Thesis, 2008 ____________________________________________________________________________________ Summary Chironomid seasonality in a high mountain lake ecosystem - case study This paper summarizes result of the first complete round-year study of chironomids in the profundal zone of an oligotrophic high mountain Tatra lake - Ľadové lake - chosen as the key site in the EMERGE project. High mountain or arctic lakes are typical by the specific chironomid species composition, low species diversity at all and low abundances as well (Bretschko, 1974, Rieradevall & Prat, 1999, Aagaard, 1986, Brundin, 1956, Steinböck, 1955) Four chironomid taxa identified in the profundal of Ľadové lake (after average abundances) - Micropsectra radialis (Goetghebuer, 1939), Pseudodiamesa nivosa (Goetghebuer, 1928), Procladius (Holotanypus) sp. and Heterotrisscladius marcidus (Walker, 1856) - and the average chironomid density of 1 700 ind m-2 have confirmed this fact. The two most abundant taxa P. nivosa and M. radialis have demonstrated a univoltine life history with emergences in July and in August, respectively. According to published data, the univolitne life cycle of chironomids is expectable in high mountain or subarctic lakes (Moore, 1979, Wiederholm, 1977, Pechlaner et...
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