Blar i NIVA-rapporter på forfatter "Velle, Gaute"
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Annual changes in aquatic plant photosynthesis in the regulated river Otra and the effect of plant removal
Demars, Benoît Olivier Laurent; Schneider, Susanne Claudia; Thiemer, Kirstine; Dörsch, Peter; Pulg, Ulrich; Stranzl, Sebastian Franz; Velle, Gaute; Pathak, Devanshi (NIVA-rapport;7858-2023, Research report, 2023)Mass development of submerged aquatic plants is often seen as nuisance for human activities. The present study used novel methods to estimate the changes in ecosystem photosynthesis (mostly Juncus bulbosus), through an ... -
Biodiversity in freshwaters: temporal trends and response to water chemistry (ICP Waters report 114/2013)
Velle, Gaute; Telford, Richard J.; Curtis, Chris; Eriksson, Lars; Fjellheim, Arne; Frolova, Marina; Fölster, Jens; Grudule, Natalja; Halvorsen, Godtfred A.; Hildrew, Alan; Hoffmann, Andreas; Indriksone, Iveta; Kamasová, Lenka; Kopáèek, Jiøí; Orton, Stuart; Krám, Pavel; Monteith, Don T.; Senoo, Takaaki; Shilland, Ewan M.; Stuchlík, Evžen; Wiklund, Magda-Lena; de Wit, Heleen; Skjelkvaale, Brit Lisa (NIVA-rapport;6580, Research report, 2013-10)This report describes trends in biological diversity of benthic invertebrates from acid-sensitive lakes and rivers sampled between 1982 and 2011 in the Czech Republic, Germany, Latvia, Norway, Sweden and the UK. The results ... -
Biodiversity of macro-invertebrates in acid-sensitive waters: trends and relations to water chemistry and climate. ICP Waters report 127/2016
Velle, Gaute; Mahlum, Shad; Monteith, Don T.; de Wit, Heleen; Arle, Jens; Eriksson, Lars; Fjellheim, Arne; Frolova, Marina; Fölster, Jens; Grudule, Natalja; Halvorsen, Godtfred A.; Hildrew, Alan; Hruška, Jakub; Indriksone, Iveta; Kamasová, Lenka; Kopáček, Jiří; Krám, Pavel; Orton, Stuart; Senoo, Takaaki; Shilland, Ewan M.; Stuchlík, Evžen; Telford, Richard J.; Ungermanová, Lenka; Wiklund, Magda-Lena; Wright, Richard F. (NIVA-rapport;7077, Research report, 2016-09)This is a study of the international impact of acid emission reductions on vulnerable freshwater biodiversity of benthic macroinvertebrates. In order to properly attribute impacts it is necessary to also incorporate the ... -
Biological intercalibration: Invertebrates 2018
Velle, Gaute; Johannessen, Arne; Landås, Torunn Svanevik (NIVA-rapport;7314, Research report, 2018)The 22nd biological intercalibration of invertebrates in the ICP Waters programme included four laboratories. The intercalibration is important for harmonising taxonomic work across countries, and is of high value in ... -
Biological intercalibration: Invertebrates 2019
Velle, Gaute; Birkeland, Ina Bakke; Johannessen, Arne; Landås, Torunn Svanevik (NIVA-rapport;7433, Research report, 2019)Two laboratories participated in the 23rd biological intercalibration of invertebrates in the ICP Waters programme. The intercalibration is important for harmonising taxonomic work across countries and is of high value ... -
Biological intercalibration: Invertebrates 2020
Velle, Gaute; Birkeland, Ina Bakke; Johannessen, Arne; Landås, Torunn Svanevik (NIVA-rapport;7556, Report, 2020)The 24th biological intercalibration of invertebrates in ICP Waters included three laboratories. The intercalibration is important for harmonizing taxonomic work across countries, to ensure high quality data in the ICP ... -
Biological intercalibration: Invertebrates 2021
Bodin, Christian Lucien; Velle, Gaute; Johannessen, Arne; Landås, Torunn Svanevik (NIVA-rapport;7685, Research report, 2021)The 25th biological intercalibration of invertebrates in ICP Waters included three participants. The intercalibration is important for harmonizing taxonomic work across countries, to ensure high quality data in the ICP ... -
Biological intercalibration: Invertebrates 2022
Bodin, Christian Lucien; Velle, Gaute; Landås, Torunn Svanevik; Kalvø, Daniel (NIVA-rapport;7840-2023, Research report, 2023)The ICP Waters biological intercalibration of invertebrates was executed to harmonise taxonomic work across countries and is of high value in programmes where the focus is on community analyses, e.g., for the classification ... -
Biological intercalibration: Invertebrates 2023
Bodin, Christian Lucien; Velle, Gaute; Landås, Torunn Svanevik (NIVA-rapport;7927-2024, Report, 2024)The ICP Waters biological intercalibration of invertebrates was executed to harmonise taxonomic work across countries and is of high value in programmes where the focus is on community analyses, e.g., for the classification ... -
Hydropower: gas supersaturation and the role of aquatic plant photosynthesis for fish health
Demars, Benoît Olivier Laurent; Dörsch, Peter; Thiemer, Kirstine; Clayer, Francois; Schneider, Susanne Claudia; Stranzl, Sebastian Franz; Pulg, Ulrich; Velle, Gaute (NIVA-rapport;7633, Research report, 2021)Fish and invertebrates breathing in water supersaturated with gas (total dissolved gas; TDG), e.g. at the outlet of hydropower plants, may develop gas bubble disease (analogous to the bends in humans). Aquatic plants also ... -
Responses of benthic invertebrates to chemical recovery from acidification
Velle, Gaute; Bodin, Christian Lucien; Arle, Jens; Austnes, Kari; Boggero, Angela; Bojkova, Jindriska; Fornaroli, Riccardo; Fölster, Jens; Goedkoop, Willem; Jones, Iwan; Juggins, Steve; Lau, Danny C.P.; Monteith, Don; Murphy, John; Musazzi, Simona; Shilland, Ewan; Steingruber, Sandra; Wiklund, Magda-Lena; de Wit, Heleen (NIVA-rapport;7881-2023, Research report, 2023)The report provides an assessment of biological recovery from acidification in freshwater environments in Europe. The report consists of two parts, a regional data analysis based on an international dataset of biological ...