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Datasets for Does hydrogenotrophic methanogenesis occur in seagrass beds? Insights from whole-ecosystem stable isotope labelling
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Dataset
Datasets for: Does hydrogenotrophic methanogenesis occur in seagrass beds? Insights from whole-ecosystem stable isotope labelling
figshare
14/07/2026
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Abstract
Seagrass beds are blue carbon ecosystems; however, they release methane (CH4), a potent greenhouse gas. Although likely important, the influence of primary production on methanogenic pathways is unknown. We labelled intact seagrass-sediment cores and in situ seagrass beds with 13C-dissolved inorganic carbon (13C-DIC) to trace the transfer to 13C-CH4 over a short (<24 hours) and long (35 days) time frame. Labelled carbon was transferred from DIC to CH4 in the absence of primary production, indicating hydrogenotrophic methanogenesis or mixotrophy. Longer-term persistent in situ 13C-CH4 release suggests that CH4 was also produced from 13C-labelled organic substrates. The transformation rate of 13C-DIC to 13C-CH4 was slower in the light, indicating interactions with primary production via CH4 oxidation or substrate competition. These findings highlight the role of plant-sediment interactions in governing methanogenic pathways, with implications for seagrass beds as carbon sequestering hotspots and CH4 sources.These datasets contain: Dissolved oxygen, and methane and DOC specific 13C-enrichment in core incubations, specific enrichment of solid carbon pools in core incubations, methane and DOC 13C-enrichment of in situ benthic chamber water and porewater DOC specific 13C-enrichment in in situ seagrass beds.
Details
- Title
- Datasets for: Does hydrogenotrophic methanogenesis occur in seagrass beds? Insights from whole-ecosystem stable isotope labelling
- Creators
- Mona Abouhaidar Andskog - Southern Cross University
- Publisher
- figshare
- Identifiers
- 991013389815102368
- Academic Unit
- Faculty of Science and Engineering
- Language
- English
- Resource Type
- Dataset