Stable Carbon Isotope Signature of Methane Released From Phytoplankton
Klintzsch, Thomas (Heidelberg University. Institute of Earth Sciences)
Geisinger, H. (Heidelberg University. Institute of Earth Sciences)
Wieland, Anna (Heidelberg University. Institute of Earth Sciences)
Langer, Gerald (Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals)
Nehrke, G. (Alfred Wegener Institute. Helmholtz Centre for Polar and Marine Research)
Bizic, Mina (Leibniz-Institute of Freshwater Ecology and Inland Fisheries)
Greule, Markus (Heidelberg University. Institute of Earth Sciences)
Lenhart, Katharina (University of Applied Sciences (Bingen, Alemanya))
Borsch, C. (Justus Liebig University Giessen)
Schroll, M. (Heidelberg University. Institute of Earth Sciences)
Keppler, Frank (Heidelberg University. Institute of Earth Sciences)

Date:	2023
Abstract:	Aquatic ecosystems play an important role in global methane cycling and many field studies have reported methane supersaturation in the oxic surface mixed layer (SML) of the ocean and in the epilimnion of lakes. The origin of methane formed under oxic condition is hotly debated and several pathways have recently been offered to explain the "methane paradox. " In this context, stable isotope measurements have been applied to constrain methane sources in supersaturated oxygenated waters. Here we present stable carbon isotope signatures for six widespread marine phytoplankton species, three haptophyte algae and three cyanobacteria, incubated under laboratory conditions. The observed isotopic patterns implicate that methane formed by phytoplankton might be clearly distinguished from methane produced by methanogenic archaea. Comparing results from phytoplankton experiments with isotopic data from field measurements, suggests that algal and cyanobacterial populations may contribute substantially to methane formationobserved in the SML of oceans and lakes.
Grants:	Ministerio de Ciencia e Innovación CEX2019-000940-M
Note:	Unidad de excelencia María de Maeztu CEX2019-000940-M
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Algae ; Cyanobacteria ; Methane ; Methane paradox ; Phytoplankton ; Stable isotopes
Published in:	Geophysical research letters, Vol. 50, Issue 12 (June 2023) , art. e2023GL103317, ISSN 0094-8276

DOI: 10.1029/2023GL103317

12 p, 1.4 MB

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