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

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2022

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

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Science of The Total Environment. Elsevier. 2022, 848, 157485. ISSN 0048-9697. eISSN 1879-1026. Available under: doi: 10.1016/j.scitotenv.2022.157485

Zusammenfassung

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.

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570 Biowissenschaften, Biologie

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ISO 690THALASSO, Frederic, Armando SEPULVEDA-JAUREGUI, Léa CABROL, Céline LAVERGNE, Nazlı OLGUN, Karla MARTÍNEZ-CRUZ, Polette AGUILAR-MUÑOZ, Natalia CALLE, Andrés MANSILLA, María Soledad ASTORGA-ESPAÑA, 2022. Methane and carbon dioxide cycles in lakes of the King George Island, maritime Antarctica. In: Science of The Total Environment. Elsevier. 2022, 848, 157485. ISSN 0048-9697. eISSN 1879-1026. Available under: doi: 10.1016/j.scitotenv.2022.157485
BibTex
@article{Thalasso2022-11-20Metha-59309,
  year={2022},
  doi={10.1016/j.scitotenv.2022.157485},
  title={Methane and carbon dioxide cycles in lakes of the King George Island, maritime Antarctica},
  volume={848},
  issn={0048-9697},
  journal={Science of The Total Environment},
  author={Thalasso, Frederic and Sepulveda-Jauregui, Armando and Cabrol, Léa and Lavergne, Céline and Olgun, Nazlı and Martínez-Cruz, Karla and Aguilar-Muñoz, Polette and Calle, Natalia and Mansilla, Andrés and Astorga-España, María Soledad},
  note={Article Number: 157485}
}
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