Dissolved CH4 coupled to photosynthetic picoeukaryotes in oxic waters and to cumulative chlorophyll a in anoxic waters of reservoirs León Palmero, Elizabeth Contreras Ruiz, Alba Sierra, Ana Morales Baquero, Rafael Reche Cañabate, Isabel Methane (CH4) emissions from reservoirs are responsible for most of the atmospheric climatic forcing of these aquatic ecosystems, comparable to emissions from paddies or biomass burning. Primarily, CH4 is produced during the anaerobic mineralization of organic carbon in anoxic sediments by methanogenic archaea. However, the origin of the recurrent and ubiquitous CH4 supersaturation in oxic waters (i.e., the methane paradox) is still controversial. Here, we determined the dissolved CH4 concentration in the water column of 12 reservoirs during summer stratification and winter mixing to explore CH4 sources in oxic waters. 2020-11-10T08:49:00Z 2020-11-10T08:49:00Z 2020-06-26 journal article León-Palmero, E., Contreras-Ruiz, A., Sierra, A., Morales-Baquero, R., & Reche, I. (2020). Dissolved CH 4 coupled to photosynthetic picoeukaryotes in oxic waters and to cumulative chlorophyll a in anoxic waters of reservoirs. Biogeosciences, 17(12), 3223-3245. [https://doi.org/10.5194/bg-17-3223-2020] http://hdl.handle.net/10481/64159 10.5194/bg-17-3223-2020 eng http://creativecommons.org/licenses/by/3.0/es/ open access Atribución 3.0 España Copernicus Gesellschaft MBH