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Long-term changes in chironomid assemblages of the River Hron, Slovakia
Title Long-term changes in chironomid assemblages of the River Hron, Slovakia Author info Peter Bitušík, Marek Svitok Author Bitušík Peter 1957- UMBFP09 - Katedra biológie a environmentálnych štúdií
Co-authors Svitok Marek
Source document Programme and Abstracts : SEFS-5, symposium for European Freshwater Sciences, Palermo, Italy, July 8.-13. 2007. S. 180. - Palermo, Italy, 2007 Keywords pakomáre - midges - Chironomidae dvojkrídlovce - Diptera long-term changes Headings Geogr. Hron (Slovensko : rieka) Language English Country Italy Annotation Changes in chironomid assemblage structure were determined at time scale of two decades (1986-2003) at nine sites along the River Hron. In addition, a number of water quality variables were measured monthly over the same periods. Statistical significant upward trends of pH were detected at most studied sites. Long-term decrease of nutrients concentration and increase of oxygen amount was apparent at three upper situated sites. Environmental conditions at lower reaches appeared to be rather stable without significant trends in water quality variables. The greatest component of variation between the chironomid assemblages was related to spatial differences rather than temporal differences. Responses of species richness to altitudinal gradient to position on the longitudinal gradient showed in 1980s bimodal pattern with a distinct peak in the middle reaches, while beli shaped pattern with a peak in lower reaches and continual decrease towards higher altitudes was found in 2003. Differences in chironomid distributional patterns along the longitudinal profile appeared to be driven mostly by changes in water quality Public work category AFG No. of Archival Copy 10846 Catal.org. BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici Database xpca - PUBLIKAČNÁ ČINNOSŤ 
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Number of the records: 1