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Paired O₂–CO₂ measurements provide emergent insights into aquatic ecosystem function
(Wiley, 2020) Vachon, Dominic; Sadro, Steven; Bogard, Matthew J.; Lapierre, Jean-Francois; Baulch, Helen M.; Rusak, James A.; Denfeld, Blaize A.; Laas, Alo; Klaus, Marcus; Karlsson, Jan; Weyhenmeyer, Gesa A.; del Giorgio, Paul A.
Metabolic stoichiometry predicts that dissolved oxygen (O2 ) and carbon dioxide (CO2 ) in aquatic ecosystems should covary inversely; however, field observations often diverge from theoretical expectations. Here, we propose a suite of metrics describing this O 2 and CO2 decoupling and introduce a conceptual framework for interpreting these metrics within aquatic ecosys- tems. Within this framework, we interpret cross-system patterns of high-frequency O 2 and CO2 measurements in 11 northern lakes and extract emergent insights into the metabolic behavior and the simultaneous roles of chemical and physical forcing in shaping ecosystem processes. This approach leverages the power of high-frequency paired O 2–CO2 measurements, and yields a novel, integrative aquatic system typology which can also be applicable more broadly to streams and rivers, wetlands and marine systems.