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Sirvi Autor "Argillier, Christine" järgi

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  • Pisipilt
    Kirje
    Impacts of multiple stressors on freshwater biota across spatial scales and ecosystems
    (Nature Publishing Group, 2020) Birk, Sebastian; Chapman, Daniel; Carvalho, Laurence; Spears, Bryan M.; Andersen, Hans Estrup; Argillier, Christine; Auer, Stefan; Baattrup-Pedersen, Annette; Banin, Lindsay; Beklioglu, Meryem; Bondar-Kunze, Elisabeth; Borja, Angel; Branco, Paulo; Bucak, Tuba; Buijse, Anthonie D.; Cardoso, Ana Cristina; Couture, Raoul-Marie; Cremona, Fabien; de Zwart, Dick; Feld, Christian K.; Ferreira, M. Teresa; Feuchtmayr, Heidrun; Gessner, Mark O.; Gieswein, Alexander; Globevnik, Lidija; Graeber, Daniel; Graf, Wolfram; Gutierrez-Canovas, Cayetano; Hanganu, Jenica; Iskin, Ugur; Jarvinen, Marko; Jeppesen, Erik; Kotamaki, Niina; Kuijper, Marijn; Lemm, Jan U.; Shenglan, Lu; Solheim, Anne Lyche; Mischke, Ute; Moe, S. Jannicke; Nõges, Peeter; Nõges, Tiina; Ormerod, Steve J.; Panagopoulos, Yiannis; Phillips, Geoff; Posthuma, Leo; Pouso, Sarai; Prudhomme, Christel; Rankinen, Katri; Rasmussen, Jes J.; Richardson, Jessica; Sagouis, Alban; Santos, Jose Maria; Schaefer, Ralf B.; Schinegger, Rafaela; Schmutz, Stefan; Schneider, Susanne C.; Schuelting, Lisa; Segurado, Pedro; Stefanidis, Kostas; Sures, Bernd; Thackeray, Stephen J.; Turunen, Jarno; Uyarra, Maria C.; Venohr, Markus; von der Ohe, Peter Carsten; Willby, Nigel; Hering, Daniel; Chair of Hydrobiology and Fishery. Institute of Agricultural and Environmental sciences
    Climate and land-use change drive a suite of stressors that shape ecosystems and interact to yield complex ecological responses (that is, additive, antagonistic and synergistic effects). We know little about the spatial scales relevant for the outcomes of such interactions and little about effect sizes. These knowledge gaps need to be filled to underpin future land management decisions or climate mitigation interventions for protecting and restoring freshwater ecosystems. This study combines data across scales from 33 mesocosm experiments with those from 14 river basins and 22 cross-basin studies in Europe, producing 174 combinations of paired-stressor effects on a biological response variable. Generalized linear models showed that only one of the two stressors had a significant effect in 39% of the analysed cases, 28% of the paired-stressor combinations resulted in additive effects and 33% resulted in interactive (antagonistic, synergistic, opposing or reversal) effects. For lakes, the frequencies of additive and interactive effects were similar for all spatial scales addressed, while for rivers these frequencies increased with scale. Nutrient enrichment was the overriding stressor for lakes, with effects generally exceeding those of secondary stressors. For rivers, the effects of nutrient enrichment were dependent on the specific stressor combination and biological response vari- able. These results vindicate the traditional focus of lake restoration and management on nutrient stress, while highlighting that river management requires more bespoke management solutions.
  • Pisipilt
    Kirje
    Model-based decomposition of environmental, spatial and species-interaction effects on the community structure of common fish species in 772 European lakes
    (Wiley, 2021) Mehner, Thomas; Argillier, Christine; Hesthagen, Trygve; Holmgren, Kerstin; Jeppesen, Erik; Kelly, Fiona; Krause, Teet; Olin, Mikko; Volta, Pietro; Winfield, Ian J.; Brucet, Sandra
    Aim: We tested whether there is a strong effect of species interactions on assembly of local lake fish communities, in addition to environmental filters and dispersal. Location: Seven hundred and seventy-two European lakes and reservoirs. Time period: 1993–2012. Major taxa studied: Nineteen species of freshwater fishes. Methods: We applied a latent variable approach using Bayesian Markov chain Monte Carlo algorithms (R package “BORAL”). We compared the contributions of six environmental predictors and the spatial organization of 772 European lakes in 209 river basins on the presence/absence of the 19 most frequent fish species and on the biomass and mean mass of the six dominant species. We inspected the residual correlation matrix for positive and negative correlations between species. Results: Environmental (50%) and spatial (10%) predictors contributed to the presence/absence assembly of lake fish communities, whereas lake size and productivity contributed strongly to the biomass and mean mass structures. We found highly significant negative correlations between predator and prey fish species pairs in the presence/absence, biomass and mean mass datasets. There were more significantly positive than negative correlations between species pairs in all three datasets. In addition, unmeasured abiotic predictors might explain some of the correlations between species. Main conclusions: Strong effects of species interactions on assembly of lake fish communities are very likely. We admit that our approach is of a correlational nature and does not generate mechanistic evidence that interactions strongly shape fish community structures; however, the results fit with present knowledge about the interactions between the most frequent fish species in European lakes and they support the assumption that, in particular, the mean masses of fish species in lakes are modified by species interactions.