Dissolved CH4 coupled to photosynthetic picoeukaryotes in oxic waters and to cumulative chlorophyll a in anoxic waters of reservoirs

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.

Spanish Ministry of Economy and Competitiveness CGL2014-52362-R

University of Granada - Unidades de Excelencia UCE.PP2017.03

Consejería de Economía, Conocimiento, Empresas, y Universidad de Andalucía

European Union (EU) SOMM17/6109/UGR

Ministry of Education, Culture and Sport FPU014/02917 FPU2014-04048

Youth Employment Initiative (YEI) from the Junta de Andalucia

European Commission European Commission Joint Research Centre 6017