Methane and carbon dioxide cycles in lakes of the King George Island, maritime Antarctica

Frederic Thalasso, Armando Sepulveda-Jauregui, Léa Cabrol, Céline Lavergne, Nazlı Olgun, Karla Martinez-Cruz, Polette Aguilar-Muñoz, Natalia Calle, Andrés Mansilla, María Soledad Astorga-España*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Freshwater ecosystems are important contributors to the global greenhouse gas budget and a comprehensive assessment of their role in the context of global warming is essential. Despite many reports on freshwater ecosystems, relatively little attention has been given so far to those located in the southern hemisphere and our current knowledge is particularly poor regarding the methane cycle in non-perennially glaciated lakes of the maritime Antarctica. We conducted a high-resolution study of the methane and carbon dioxide cycle in a lake of the Fildes Peninsula, King George Island (Lat. 62°S), and a succinct characterization of 10 additional lakes and ponds of the region. The study, done during the ice-free and the ice-seasons, included methane and carbon dioxide exchanges with the atmosphere (both from water and surrounding soils) and the dissolved concentration of these two gases throughout the water column. This characterization was complemented with an ex-situ analysis of the microbial activities involved in the methane cycle, including methanotrophic and methanogenic activities as well as the methane-related marker gene abundance, in water, sediments and surrounding soils. The results showed that, over an annual cycle, the freshwater ecosystems of the region are dominantly autotrophic and that, despite low but omnipresent atmospheric methane emissions, they act as greenhouse gas sinks.

Original languageEnglish
Article number157485
JournalScience of the Total Environment
Volume848
DOIs
Publication statusPublished - 20 Nov 2022

Bibliographical note

Publisher Copyright:
© 2022 Elsevier B.V.

Funding

This project was financially supported by the “ Instituto Antártico Chileno ” (INACH, project RT_14-15 ). This project was also partially funded by the Cape Horn International Center project ( CHIC-FB210018 ). F. Thalasso received financial support from the “ Consejo Nacional de Ciencia y Tecnología ” (Conacyt, project # 255704 ). N. Olgun was funded by Istanbul Technical University (ITU Project # 40265 ).

FundersFunder number
Cape Horn International CenterCHIC-FB210018
International Technological University40265
Consejo Nacional de Ciencia y Tecnología255704
Istanbul Teknik Üniversitesi
Institut chilien de l'AntarctiqueRT_14-15

    Keywords

    • Dissolved gases
    • Fluxes
    • Greenhouse gas sink/source
    • Microbial gene abundance

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