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, Data from lakes Annecy, L eman, and Bourget were collected by OLA observatory, with thanks to INRA Thonon-les-Bains, CISALB, CIPEL, SILA, and the SOERE OLA-IS developed by ORE Eco-Informatique group. Data from Lake Stechlin were collected by the MIBI group with special thanks to Elke Mach, IGB and the Leibniz Association for financial support. For the majority of the Qu ebec, Canada lakes, we acknowledge Maria Lorena Longhi, Allain Barnett, Fonds de Recherche du Qu ebec -Nature et Technologie (FRQNT) and the Natural Sciences and Engineering Research Council of Canada (NSERC) to BEB. KCR acknowledges funding support from NSF grant EF 1638704. JAR acknowledges funding from the Ontario Ministry of the Environment and Climate Change and the Inter-American Institute for Global Change Research (Grant CRN3038). Thanks to Craig Williamson, Acknowledgments We thank Erin Overholt for assistance with processing and management of data from lakes in