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Unravelling the ecological consequences of bioturbation on greenhouse gas emissions in shallow freshwaters

浅い淡水におけるバイオターベーションが温室効果ガス排出に及ぼす生態学的影響の解明 (AI 翻訳)

Lucia Cabrera Lamann

ジャーナル2026-07-01#気候科学
DOI: 10.54195/9789465152530
原典: https://doi.org/10.54195/9789465152530

🤖 gxceed AI 要約

日本語

本研究は、浅い淡水生態系において、根を持つ水生植物や底生動物などのバイオタベーターがメタンや二酸化炭素の排出に与える影響を調査した。実験と文献レビューにより、その効果は状況依存的であり、水生植物は根の酸素供給によりメタンの貯蔵を減らす一方、外来種のザリガニはメタン排出を2.7倍増加させることを示した。バイオタベーターを温室効果ガス収支に組み込む必要性を強調している。

English

This thesis investigates how bioturbators (rooted macrophytes and benthic animals) influence methane and carbon dioxide emissions in shallow freshwater ecosystems. Using experiments and a systematic review, it shows that effects are context-dependent: macrophytes reduce methane bubble storage via root oxygenation, while invasive crayfish increased CH4 emissions 2.7-fold by removing vegetation and disturbing sediments. Results highlight the need to include bioturbators in freshwater greenhouse gas budgets.

Unofficial AI-generated summary based on the public title and abstract. Not an official translation.

📝 gxceed 編集解説 — Why this matters

日本のGX文脈において

日本のGHGインベントリや自然資本管理において、淡水生態系からのメタン排出を精緻化する基礎資料として位置づけられる。SSBJや有報に直接関係しないが、生態系ベースの排出削減策を検討する際に参考となる。

In the global GX context

This paper contributes to the global climate science literature by quantifying bioturbation effects on freshwater methane emissions, which are often overlooked in greenhouse gas inventories. It supports nature-based solutions and ecosystem management for climate mitigation, though not directly tied to corporate disclosure frameworks like TCFD or CSRD.

👥 読者別の含意

🔬研究者:Ecologists and climate scientists studying natural methane emissions should consider this empirical evidence of bioturbator effects on freshwater GHG budgets.

🏢実務担当者:Land and water managers can use these findings to account for bioturbation in freshwater restoration projects aimed at reducing methane emissions.

🏛政策担当者:Policymakers involved in national greenhouse gas inventories may need to incorporate bioturbator-induced emissions from shallow freshwaters to improve accuracy.

📄 Abstract（原文）

Shallow freshwater ecosystems are significant sources of greenhouse gases, particularly methane, yet the role of bioturbators organisms in shaping these emissions remains poorly understood. This thesis investigates how bioturbators (including rooted macrophytes and benthic animals) influence methane storage, transport, and emissions in shallow freshwater ecosystems through physical and biogeochemical modifications of sediments. Using laboratory and mesocosm experiments combined with a systematic literature review, the thesis shows that rooted macrophytes reduce sediment methane bubble storage through root oxygenation and plant-mediated gas transport, as quantified using a novel cost-effective scanning method. Benthic invertebrates such as Tubifex spp. altered methane and carbon dioxide emissions in a direction and magnitude that depended on sediment organic matter content, while the invasive red swamp crayfish increased CH₄ emissions 2.7-fold by removing macrophytes and disturbing sediments. The overarching finding is that bioturbator effects on greenhouse gas emissions are strongly context-dependent, shaped by the interaction between organism functional traits, bioturbation intensity, and sediment properties. These results highlight the need to explicitly account for bioturbators in freshwater greenhouse gas budgets and ecosystem management strategies.

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