Articles | Volume 17, issue 7
https://doi.org/10.5194/essd-17-3411-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/essd-17-3411-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Data description paper
| 
17 Jul 2025
Data description paper |
| 17 Jul 2025
| 17 Jul 2025
OLIGOTREND, a global database of multi-decadal chlorophyll a and water quality time series for rivers, lakes, and estuaries
Departament de Biologia Evolutiva, Ecologia i Ciències Ambientals, Universitat de Barcelona (UB), Diagonal 643, 08028 Barcelona, Spain
Institut de Recerca de la Biodiversitat (IRBio), Universitat de Barcelona (UB), Diagonal 643, 08028 Barcelona, Spain
Andras Abonyi
MTA-ÖK Lendület Fluvial Ecology Research Group, Karolina Street 29, 1113 Budapest, Hungary
HUN-REN Centre for Ecological Research, Institute of Aquatic Ecology, Karolina Street 29, 1113 Budapest, Hungary
WasserCluster Lunz – Biologische Station GmbH, Dr. Carl Kupelwieser Promenade 5, 3293 Lunz am See, Austria
Carles Alcaraz
Marine and Continental Waters Program, Institute of Agrifood Research and Technology (IRTA), 43540 La Ràpita, Catalonia, Spain
Jacob Diamond
Intergovernmental Hydrological Programme, UNESCO, 7 Place de Fontentoy, 75015 Paris, France
Nicholas J. K. Howden
School of Civil, Aerospace and Design Engineering, University of Bristol, Bristol, BS8 1TR, UK
Cabot Institute, University of Bristol, Bristol, BS5 9LT, UK
Michael Rode
Department of Aquatic Ecosystem Analysis and Management, Helmholtz Centre for Environmental Research – UFZ, 39104 Magdeburg, Germany
Institute of Environmental Science and Geography, University of Potsdam, 14476 Potsdam, Germany
Estela Romero
Global Ecology Unit, Centre for Ecological Research and Forestry Applications (CREAF), Campus UAB, Bellaterra, Spain
Departament de Biologia Evolutiva, Ecologia i Ciències Ambientals, Universitat de Barcelona (UB), Diagonal 643, 08028 Barcelona, Spain
Vincent Thieu
Sorbonne Université, CNRS, EPHE, UMR 7619 METIS, 4 place Jussieu, Box 105, 75005 Paris, France
Fred Worrall
Department of Earth Sciences, University of Durham, Durham, UK
Qian Zhang
University of Maryland Center for Environmental Science, US Environmental Protection Agency Chesapeake Bay Program, 1750 Forest Drive, Suite 130, Annapolis, MD 21401, USA
Xavier Benito
Marine and Continental Waters Program, Institute of Agrifood Research and Technology (IRTA), 43540 La Ràpita, Catalonia, Spain
Departament de Biologia Evolutiva, Ecologia i Ciències Ambientals, Universitat de Barcelona (UB), Diagonal 643, 08028 Barcelona, Spain
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Short summary
Many waterbodies undergo nutrient decline, called oligotrophication, globally, but a comprehensive dataset to understand ecosystem responses is lacking. The OLIGOTREND database comprises multi-decadal chlorophyll a and nutrient time series from rivers, lakes, and estuaries with 4.3 million observations from 1894 unique measurement locations. The database provides empirical evidence for oligotrophication responses with a spatial and temporal coverage that exceeds previous efforts.
Many waterbodies undergo nutrient decline, called oligotrophication, globally, but a...
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