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\begin{document}

\title{Stable Carbon Isotope Signature of Methane Released from Phytoplankton}



\author[1]{Thomas Klintzsch}%
\author[1]{Hannah Geisinger}%
\author[1]{Anna Wieland}%
\author[2]{Gerald Langer}%
\author[3]{Gernot Nehrke}%
\author[4]{Mina Bizic}%
\author[5]{Markus Greule}%
\author[6]{Katharina Lenhart}%
\author[7]{Christian Borsch}%
\author[5]{Moritz Schroll}%
\author[8]{Frank Keppler}%
\affil[1]{Institute of Earth Sciences}%
\affil[2]{2The Marine Biological Association of the United Kingdom}%
\affil[3]{Alfred-Wegener-Institute for Polar and Marine Research}%
\affil[4]{Leibniz Institute of Freshwater Ecology and Inland Fisheries}%
\affil[5]{Heidelberg University}%
\affil[6]{University of Applied Sciences}%
\affil[7]{Gießen University}%
\affil[8]{University of Heidelberg}%


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  \date{June 14, 2024}


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\begin{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 formation observed in the SML of
oceans and lakes.%
\end{abstract}%



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\verb`955430_0_art_file_10713663_rq4zml.docx`  available at \url{https://authorea.com/users/587513/articles/625160-stable-carbon-isotope-signature-of-methane-released-from-phytoplankton}

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