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Benthic macroinvertebrates along the Czech part of the Labe and lower section of the Vltava rivers from 1996–2005, with a particular focus on rare and alien species
Authors:Kate?ina Kola?íková  Jakub Horecký  Marek Li?ka  Martina Jíchová  Jolana Tátosová  Natálie Lap?anská  Zuzana Ho?ická  Pavel Chvojka  Lubo? Beran  Vladimír Ko?el  Josef Matěna  Zuzana ?iamporová-Za?ovi?ová  I?ja Krno  Eva Bulánková  Ferdinand ?porka  Petr Kment  Ev?en Stuchlík
Institution:1. Institute for Environmental Studies, Faculty of Science, Charles University in Prague, Benátská 2, CZ-12843, Praha 2, Czech Republic
2. Water Management Laboratory in Prague, Vltava River Authority, Na Hutmance 5a, CZ-15024, Praha 5, Czech Republic
3. Department of Entomology, National Museum, Kunratice 1, CZ-14800, Praha 4, Czech Republic
4. Agency for Nature Conservation and Landscape Protection of the Czech Republic, Koko?ínsko Protected Landscape Area Administration, ?eská 149, CZ-27601, Mělník, Czech Republic
5. Department of Zoology/Ecology, Comenius University in Bratislava, Mlynská dolina, SK-84215, Bratislava, Slovakia
6. Institute of Hydrobiology, Biology Centre AS CR, v.v.i., Na Sádkách 7, CZ-37005, ?eskě Budějovice, Czech Republic
7. Institute of Zoology, Slovak Academy of Sciences, Dúbravská cesta 9, SK-84506, Bratislava, Slovakia
Abstract:In the Czech part of the Labe River and the lower part of the Vltava River, we examined if the benthic macroinvertebrate composition changed from 1996 to 2005 due to expected improvements in water quality resulting from socioeconomic changes in the Czech Republic since the 1990s. Special attention was given to rare and alien species. The four biological metrics used (Number of taxa, BMWP, Number of sensitive taxa, and Number of EPT taxa) demonstrated that there was indeed an improvement in water quality as well as a slight improvement of the Labe microhabitats during the investigated period. An increasing Number of taxa over time was observed at most sites. Two main concurrent ecological processes are recently in progress in the Labe: a recovery of native species and an expansion of alien species, some of which are considered invasive. The caddisfly Setodes punctatus and the beetle Pomatinus substriatus, considered as regionally extinct in the Czech Republic until 2005, were rediscovered during our investigations. Findings of the crustacean Hemimysis anomala (invasive) and the chironomids Stenochironomus sp. and Lipiniella sp. were the first records of these taxa in the Czech Republic.
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