Diversity and effect of increasing temperature on the activity of methanotrophs in sediments of fildes Peninsula Freshwater Lakes, King George Island, Antarctica

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Título

Diversity and effect of increasing temperature on the activity of methanotrophs in sediments of fildes Peninsula Freshwater Lakes, King George Island, Antarctica

Tema

ANTARTIDA
CALENTAMIENTO GLOBAL
METANOTROFOS
METANO
BACTERIA
METANOGENESIS
BIBLIOGRAFIA NACIONAL QUIMICA
2022

Abstract

Global warming has a strong impact on polar regions. Particularly, the Antarctic Peninsula and nearby islands have experienced a marked warming trend in the past 50 years. Therefore, higher methane (CH4) emissions from this area could be expected in the future. Since mitigation of these emissions can be carried out by microbial oxidation, understanding this biological process is crucial since to our knowledge,no related studies have been performed in this area before. In this work, the aerobic CH4 oxidation potential of five freshwater lake sediments of Fildes Peninsula (King George Island, South Shetland Islands) was determined with values from 0.07 to 10 mmol CH4 gdw-1 day-1 and revealed up to 100-fold increase in temperature gradients (5, 10, 15, and 20C). The structure and diversity of the bacterial community in the sediments were analyzed by next-generation sequencing (Illumina MiSeq) of 16S rRNA and pmoA genes. A total of 4,836 ASVs were identified being Proteobacteria, Actinobacteriota, Acidobacteriota, and Bacteroidota the most abundant phyla. The analysis of the pmoA gene identified 200 ASVs of methanotrophs, being Methylobacter Clade 2 (Type I, family Methylococcaceae) the main responsible of the aerobic CH4 oxidation. Moreover, both approaches revealed the presence of methanotrophs of the classes Gammaproteobacteria (families Methylococcaceae and Crenotrichaceae), Alphaproteobacteria (family Methylocystaceae), Verrucomicrobia (family  Methylacidiphilaceae), and the candidate phylum of anaerobic methanotrophs Methylomirabilota. In addition, bacterial phospholipid fatty acids (PLFA) biomarkers were studied as a proxy for aerobic methane-oxidizing bacteria and confirmed these results. Methanotrophic bacterial diversity was significantly correlated with pH. In conclusion, our findings suggest that aerobic methanotrophs could mitigate in situ CH4 emissionsin a future scenario with higher temperatures in this climate-sensitive area. This study provides new insights into the diversity of methanotrophs, as well as the influence of
temperature on the CH4 oxidation potential in sediments of freshwater lakes in polar regions of the southern hemisphere.

Autor

Carrizo, Daniel
Sánchez García, Laura

Fuente

Frontiers in Microbiology v.13, 2022. -- e822552

Editor

Frontiers

Fecha

2022

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Formato

PDF

Idioma

Inglés

Tipo

Artículo

Identificador

10.3389/fmicb.2022.822552

Document Item Type Metadata

Original Format

PDF
Fecha de agregación
June 7, 2022
Colección
Bibliografía Nacional Química
Tipo de Elemento
Document
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Citación
Roldán, Diego M., “Diversity and effect of increasing temperature on the activity of methanotrophs in sediments of fildes Peninsula Freshwater Lakes, King George Island, Antarctica,” RIQUIM - Repositorio Institucional de la Facultad de Química - UdelaR, accessed May 18, 2024, https://riquim.fq.edu.uy/items/show/6523.
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