caa a22 4500 445890835 CHVBK 20180317145615.0 cr unu---uuuuu 170323e20110601xx s 000 0 eng 10.1007/s10750-011-0648-x doi (NATIONALLICENCE)springer-10.1007/s10750-011-0648-x The effect of in-stream gravel extraction in a pre-alpine gravel-bed river on hyporheic invertebrate community [Elektronische Daten] [Nataša Mori, Tatjana Simčič, Simon Lukančič, Anton Brancelj] We investigated the effect of in-stream gravel extraction in a pre-alpine gravel-bed river on hyporheic invertebrate community, together with changes in the hyporheic geomorphology, physico-chemistry and biofilm activity. Hyporheic invertebrates were collected, together with environmental data, on seven sampling occasions from June 2004 to May 2005, at two river reaches—at the site of in-stream gravel extraction and at a site 2.5km upstream. The hyporheic samples were taken from the river bed and from the gravel bars extending laterally from the stream channel. The invertebrate community was dominated by insect larvae (occasional hyporheos), followed by meiofauna (permanent hyporheos). Stygobionts were present at low species richness and in low densities. Gravel extraction from the stream channel led to changes in the patterns of water exchange between surface and subsurface and changes in the sediment composition at the site. Immediate reductions in density and taxonomic richness of invertebrates were observed, together with changes in their community composition. The hyporheic invertebrate community in the river recovered relatively fast (in 2.5months) by means of density and taxonomic richness, while by means of community composition invertebrates needed 5-7months to recover. The impact of fine sediments (<0.1mm) on biofilm activity measured through ETS activity and hyporheic invertebrate density and taxonomic richness was strongly confirmed in this study. Springer Science+Business Media B.V., 2011 Disturbance nationallicence In-stream gravel extraction nationallicence Pre-alpine river nationallicence Hyporheic zone nationallicence Invertebrates nationallicence Biofilm nationallicence Mori Nataša Department of Freshwater and Terrestrial Ecosystems Research, National Institute of Biology, Večna pot 111, 1001, Ljubljana, Slovenia aut Simčič Tatjana Department of Freshwater and Terrestrial Ecosystems Research, National Institute of Biology, Večna pot 111, 1001, Ljubljana, Slovenia aut Lukančič Simon Department of Freshwater and Terrestrial Ecosystems Research, National Institute of Biology, Večna pot 111, 1001, Ljubljana, Slovenia aut Brancelj Anton Department of Freshwater and Terrestrial Ecosystems Research, National Institute of Biology, Večna pot 111, 1001, Ljubljana, Slovenia aut Hydrobiologia Springer Netherlands 667/1(2011-06-01), 15-30 0018-8158 667:1<15 2011 667 10750 https://doi.org/10.1007/s10750-011-0648-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10750-011-0648-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mori Nataša Department of Freshwater and Terrestrial Ecosystems Research, National Institute of Biology, Večna pot 111, 1001, Ljubljana, Slovenia aut NATIONALLICENCE 700 1- Simčič Tatjana Department of Freshwater and Terrestrial Ecosystems Research, National Institute of Biology, Večna pot 111, 1001, Ljubljana, Slovenia aut NATIONALLICENCE 700 1- Lukančič Simon Department of Freshwater and Terrestrial Ecosystems Research, National Institute of Biology, Večna pot 111, 1001, Ljubljana, Slovenia aut NATIONALLICENCE 700 1- Brancelj Anton Department of Freshwater and Terrestrial Ecosystems Research, National Institute of Biology, Večna pot 111, 1001, Ljubljana, Slovenia aut NATIONALLICENCE 773 0- Hydrobiologia Springer Netherlands 667/1(2011-06-01), 15-30 0018-8158 667:1<15 2011 667 10750 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer