Publication Details |
| Category | Text Publication |
| Reference Category | Journals |
| DOI | 10.5194/essd-17-3411-2025 |
Licence  |
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| Title (Primary) | OLIGOTREND, a global database of multi-decadal chlorophyll a and water quality time series for rivers, lakes, and estuaries |
| Author | Minaudo, C.; Abonyi, A.; Alcaraz, C.; Diamond, J.; Howden, N.J.K.; Rode, M.
; Romero, E.; Thieu, V.; Worrall, F.; Zhang, Q.; Benito, X. |
| Source Titel | Earth System Science Data |
| Year | 2025 |
| Department | ASAM |
| Volume | 17 |
| Issue | 7 |
| Page From | 3411 |
| Page To | 3430 |
| Language | englisch |
| Topic | T4 Coastal System T5 Future Landscapes |
| Data and Software links | https://doi.org/10.6073/pasta/a7ad060a4dbc4e7dfcb763a794506524 |
| Abstract | Reversed eutrophication, called oligotrophication, has been widely documented globally over the last 30 years in rivers, lakes, and estuaries. However, the absence of a comprehensive and harmonized dataset has hindered a deeper understanding of its ecological consequences. To address this data gap, we developed the OLIGOTREND database, which contains multi-decadal time series of chlorophyll a, nutrients (nitrogen and phosphorus), and related physicochemical parameters, totalling 4.3 million observations. These data originate from 1894 unique monitoring locations across estuaries (n = 238), lakes (687), and rivers (969). Most time series cover the period from 1986–2022 and comprise at least 15 years of chlorophyll a observations. Each location is associated with catchment and hydroclimatic attributes. Trend and breakpoint analyses were applied to all time series. Chlorophyll a showed temporally variable and ecosystem-specific responses to nutrient declines with an overall declining trend for 18 % of the time series, contrasting greatly with a majority of declining trends for nutrient concentrations. We harmonized the database to ensure reproducibility and ease of access and support future updates and contributions. Available at https://doi.org/10.6073/pasta/a7ad060a4dbc4e7dfcb763a794506524 (Minaudo and Benito, 2024), the OLIGOTREND database supports collaborative efforts aimed at further advancing our understanding of biogeochemical and biological mechanisms underlining oligotrophication and ecological impacts of global long-term environmental change. |
| Persistent UFZ Identifier | https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=31085 |
| Minaudo, C., Abonyi, A., Alcaraz, C., Diamond, J., Howden, N.J.K., Rode, M., Romero, E., Thieu, V., Worrall, F., Zhang, Q., Benito, X. (2025): OLIGOTREND, a global database of multi-decadal chlorophyll a and water quality time series for rivers, lakes, and estuaries Earth Syst. Sci. Data 17 (7), 3411 - 3430 10.5194/essd-17-3411-2025 |
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