Tobias Vrede

Presentation
I am a researcher at the Department of Aquatic Sciences and Assessment. My expertise includes ecology in limnic ecosystems (especially lakes), with a main focus on plankton, nutrient dynamics, ecological stoichiometry, food webs and biodiversity. The research concerns several different applied areas such as acidification, nutrient depletion (oligotrophication), eutrophication and climate change.
- Doctor of Philosophy in Limnology, Uppsala University (1998). Thesis: The role of crustacean zooplankton in pelagic nutrient cycling.
- Associate Professor of Biology with specialisation in Limnology, Uppsala University 2006
Selected publications
Sagrario, M. D. G., T. Vrede & S. Belle, 2024. Late Holocene cooling drove drastic decreases in cladoceran diversity in a subarctic lake. Scientific Reports 14: 13. doi: 10.1038/s41598-024-81690-7
Paltsev, A., A. K. Bergström, K. Vuorio, I. F. Creed, D. O. Hessen, P. Kortelainen, J. Vuorenmaa, H. A. de Wit, D. C. P. Lau, T. Vrede, P. D. F. Isles, A. Jonsson, E. Geibrink, K. K. Kahilainen & S. Drakare, 2024. Phytoplankton biomass in northern lakes reveals a complex response to global change. Science of the Total Environment 940: 17. doi: 10.1016/j.scitotenv.2024.173570
Chaguaceda, F., D. C. P. Lau, W. Goedkoop, M. Fadhlaoui, I. Lavoie & T. Vrede, 2024. Zooplankton in northern lakes show taxon-specific responses in fatty acids across climate-productivity and ecosystem size gradients. Limnology and Oceanography 69: 947-960. doi: 10.1002/lno.12539
Bergström, A. K., I. F. Creed, A. Paltsev, H. A. de Wit, D. C. P. Lau, S. Drakare, T. Vrede, P. D. F. Isles, A. Jonsson, E. Geibrink, P. Kortelainen, J. Vuorenmaa, K. Vuorio, K. K. Kahilainen & D. O. Hessen, 2024. Declining calcium concentration drives shifts toward smaller and less nutritious zooplankton in northern lakes. Global Change Biology 30: 16. doi: 10.1111/gcb.17220
Huser, B. J., M. N. Futter, D. Bogan, J. E. Brittain, J. M. Culp, W. Goedkoop, I. Gribovskaya, J. Karlsson, D. C. P. Lau, K. M. Ruhland, A. K. Schartau, R. Shaftel, J. P. Smol, T. Vrede & J. Lento, 2022. Spatial and temporal variation in Arctic freshwater chemistry – Reflecting climate-induced landscape alterations and a changing template for biodiversity. Freshwater Biology 67: 14-29. doi: 10.1111/fwb.13645
Lau, D. C. P., K. S. Christoffersen, J. Erkinaro, B. Hayden, J. Heino, S. Hellsten, K. Holmgren, K. K. Kahilainen, M. Kahlert, S. M. Karjalainen, J. Karlsson, L. Forsstrom, J. Lento, M. Mjelde, J. Ruuhijarvi, S. Sandoy, A. K. Schartau, M. A. Svenning, T. Vrede & W. Goedkoop, 2022. Multitrophic biodiversity patterns and environmental descriptors of sub-Arctic lakes in northern Europe. Freshwater Biology 67: 30-48. doi: 10.1111/fwb.13477
Schartau, A. K., H. L. Mariash, K. S. Christoffersen, D. Bogan, O. P. Dubovskaya, E. B. Fefilova, B. Hayden, H. R. Ingvason, E. A. Ivanova, O. N. Kononova, E. S. Kravchuk, J. Lento, M. Majaneva, A. A. Novichkova, M. Rautio, K. M. Ruhland, R. Shaftel, J. P. Smol, T. Vrede & K. K. Kahilainen, 2022. First circumpolar assessment of Arctic freshwater phytoplankton and zooplankton diversity: Spatial patterns and environmental factors. Freshwater Biology 67: 141-158. doi: 10.1111/fwb.13783
Belle, S., J. L. Nilsson, I. Tonno, R. Freiberg, T. Vrede & W. Goedkoop, 2019. Climate-induced changes in carbon flows across the plant-consumer interface in a small subarctic lake. Scientific Reports 9. doi: 10.1038/s41598-019-53541-3
Creed, I. F., A. K. Bergstrom, C. G. Trick, N. B. Grimm, D. O. Hessen, J. Karlsson, K. A. Kidd, E. Kritzberg, D. M. McKnight, E. C. Freeman, O. E. Senar, A. Andersson, J. Ask, M. Berggren, M. Cherif, R. Giesler, E. R. Hotchkiss, P. Kortelainen, M. M. Palta, T. Vrede & G. A. Weyhenmeyer, 2018. Global change-driven effects on dissolved organic matter composition: Implications for food webs of northern lakes. Global Change Biology 24: 3692-3714. doi: 10.1111/gcb.14129
Lau, D. C. P., T. Vrede & W. Goedkoop, 2017. Lake responses to long-term disturbances and management practices. Freshwater Biology 62: 792-806. doi: 10.1111/fwb.12902
Lau, D. C. P., I. Sundh, T. Vrede, J. Pickova & W. Goedkoop, 2014. Autochthonous resources are the main driver of consumer production in dystrophic boreal lakes. Ecology 95: 1506-1519. doi: 10.1890/13-1141.1
Johansson, K. S. L., T. Vrede, K. Lebret & R. K. Johnson, 2013. Zooplankton feeding on the nuisance flagellate Gonyostomum semen. Plos One 8: e62557. doi: 10.1371/journal.pone.0062557
Faithfull, C. L., A.-K. Bergström & T. Vrede, 2011. Effects of nutrients and physical lake characteristics on bacterial and phytoplankton production: A meta-analysis. Limnology and Oceanography 56: 1703-1713. doi: 10.4319/lo.2011.56.5.1703
Milbrink, G., T. Vrede, L. J. Tranvik & E. Rydin, 2011. Large scale and long-term decrease in fish growth following the construction of hydroelectric reservoirs. Canadian Journal of Fisheries and Aquatic Sciences 68: 2167–2173. doi: 10.1139/F2011-131
Vrede, T., S. Drakare, P. Eklöv, A. Hein, A. Liess, J. Olsson, J. Persson, M. Quevedo, H. Ragnarsson & R. Svanbäck, 2011. Ecological stoichiometry of Eurasian perch – effects of size, habitat and diet. Oikos 120: 886-896. doi: 10.1111/j.1600-0706.2010.18939.x
Vrede, T., A. P. Ballantyne, C. Mille-Lindblom, G. Algesten, C. Gudasz, S. Lindahl & A. K. Brunberg, 2009. Effects of N:P loading ratios on phytoplankton community composition, primary production, and N fixation in a eutrophic lake. Freshwater Biology 54: 331-344. doi: 10.1111/j.1365-2427.2008.02118.x
Persson, J. & T. Vrede, 2006. Polyunsaturated fatty acids in zooplankton: variation due to taxonomy and trophic position. Freshwater Biology 51: 887-900. doi: 10.1111/j.1365-2427.2006.01540.x
Vrede, T. & L. J. Tranvik, 2006. Iron constraints on planktonic primary production in oligotrophic lakes. Ecosystems 9: 1094-1105. doi: 10.1007/s10021-006-0167-1
Vrede, T., D. R. Dobberfuhl, S. A. L. M. Kooijman & J. J. Elser, 2004. Fundamental connections among organism C:N:P stoichiometry, macromolecular composition, and growth. Ecology 85: 1217-1229. doi: 10.1890/02-0249
Vrede, T., J. Persson & G. Aronsen, 2002. The influence of food quality (P:C ratio) on RNA:DNA ratio and somatic growth rate of Daphnia. Limnology and Oceanography 47: 487-494. doi: 10.4319/lo.2002.47.2.0487