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Caddisflies (Trichoptera) as good indicators of environmental stress in mountain lotic ecosystems

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Abstract

We analysed the influence of environmental stress (mainly deforestation of catchment due to windstorm) on taxonomic structure as well as composition of functional groups (FG) based on zonation preferences and feeding types of caddisfly species in 11 streams (12 sites) with various environmental conditions situated in the High Tatra Mts, Slovakia. Using Spearman correlation, we confirmed an expected positive association between taxonomic and functional groups richness (Ri), diversity (Shannon — Wiener Index) (Di) and equitability (Eq), but not with habitat diversity (HQA indices). By testing measured physiographical, physico-chemical and hydromorphological factors using CCA analysis we found that stream order and temperature best explained the functional and taxonomic structure of caddisfly assemblages. The occurrence of Rhyacophila glareosa decreased with increasing daily mean water temperature positively correlated with deforestation, whereas R. tristis (dominating at sites most affected by erosion) showed the opposite pattern. Composition of functional groups based on zonation preferences and feeding types distinguished well near natural sites from impacted ones, dominated by crenal/rhithral predators, and explained more of the overall variance of the species-environment relationships than taxonomic composition of caddisfly assemblages.

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  1. Department of Ecology, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská dolina, SK-84215, Bratislava, Slovakia

    Daniela Kalaninová & Eva Bulánková

  2. Institute of Zoology, Slovak Academy of Sciences, Dúbravská cesta 9, SK-84506, Bratislava, Slovakia

    Ferdinand Šporka

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  1. Daniela Kalaninová
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Kalaninová, D., Bulánková, E. & Šporka, F. Caddisflies (Trichoptera) as good indicators of environmental stress in mountain lotic ecosystems. Biologia 69, 1030–1045 (2014). https://doi.org/10.2478/s11756-014-0405-5

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