Invasive North American beaver alters greenhouse gas fluxes in sub-Antarctic riparian forests
北米ビーバーの侵入が亜南極河畔林の温室効果ガスフラックスを変化させる (AI 翻訳)
Julio Alberto Salas-Rabaza, Carla Knappik, María Soledad Astorga-España, Brenda Riquelme-del Río, José Luis Andrade, Frederic Thalasso
🤖 gxceed AI 要約
日本語
本研究は、亜南極の河畔林において、侵入種である北米ビーバーが造成した湿地と隣接する未撹乱林におけるメタンと二酸化炭素のフラックスを比較した。ビーバー劣化エリアではCH4排出が顕著に高いが、CO2排出は未撹乱林で高く、樹木の総一次生産を考慮すると未撹乱林は正味の吸収源、ビーバー湿地は排出源となることを示した。
English
This study compares GHG fluxes (CH4 and CO2) between beaver-created wetlands and intact riparian forests in sub-Antarctic ecosystems. CH4 emissions were higher in degraded areas, while CO2 was higher in intact forests. Including tree gross primary production, the intact forest is a net carbon sink, whereas the beaver wetland is a net source, highlighting climate impacts of invasive beaver-driven deforestation.
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
南米亜南極地域の事例であり日本の生態系に直接適用できないが、外来種による炭素収支変化の定量化手法は、日本の土地利用変化や外来種管理の温室効果ガスインベントリに示唆を与える可能性がある。
In the global GX context
This empirical evidence on invasive species altering ecosystem carbon balance is relevant to global climate policy on land-use change and natural climate solutions, providing methodology applicable to IPCC guidelines for wetlands and forestry.
👥 読者別の含意
🔬研究者:Provides detailed quantification of GHG fluxes from beaver-modified wetlands for ecosystem carbon modeling and invasive species impact assessments.
🏛政策担当者:Highlights climate mitigation value of preventing invasive species-driven deforestation, relevant for national GHG inventories and nature-based solution policies.
📄 Abstract（原文）
Abstract The North American beaver (Castor canadensis) is a keystone species that has become a major invasive threat in the sub-Antarctic forests of the Fuegian Archipelago. By constructing dams, beavers flood and kill extensive forest areas, convert riparian forests into wetlands, and disrupt hydrological and biogeochemical processes. This study presents an integrated assessment of the greenhouse gas balance, including methane (CH4) and carbon dioxide (CO2), in a beaver-created wetland compared with an adjacent intact riparian forest. Fluxes were measured from water, soil, and tree stem surfaces. CH4 emissions were markedly higher in the beaver-degraded area than in the intact forest, with total ecosystem emissions of 74.3 and −5.8 kg CH4 ha-1 yr-1, respectively. Contrastingly, CO2 emissions were greater in the intact riparian forest (143.27 t CO2 ha-1 yr-1) than beaver-degraded forest (15.72 t CO2 ha-1 yr-1), but CO2 uptake was found in the ponds and rivers of both areas. Total greenhouse gas emissions, expressed as carbon dioxide equivalents (CO2-eq), were 125.15 t CO2-eq ha-1 yr-1 higher in the intact forest than in the beaver-created wetland. However, this difference does not account for the substantial tree gross primary production (GPP), which was not directly measured in the present study. When including this GPP, the intact riparian forest likely functions as a net carbon sink (-15 t CO2-eq ha-1 yr-1), whereas the beaver-created wetland, devoid of live trees, remains a net source (17.94 t CO2-eq ha-1 yr-1). This imbalance underscores the climate impact of beaver-driven deforestation in southernmost ecosystems.
🔗 Provenance — このレコードを発見したソース
- crossref https://doi.org/10.1088/1748-9326/ae8d39first seen 2026-07-21 06:02:04
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