Monitoring bioremediation of an impacted coastal lagoon through nature-based solutions: a case study of the Maricá Lagoon (RJ, Brazil)
自然由来の解決法による閉鎖性沿岸ラグーンのバイオレメディエーションのモニタリング：ブラジル・マリカラグーン（RJ）の事例研究 (AI 翻訳)
Valquíria Maria de Carvalho Aguiar, Rodrigo Coutinho Abuchacra, Beatriz Freitas dos Santos Gonçalves, Joel de Mattos, Joana Aiko Takiguchi Senra da Cruz, Paulo Henrique Campos, Milena Bertges de Carvalho Magalhães, Alcinei Rodrigues Machado, José António Baptista Neto
🤖 gxceed AI 要約
日本語
ブラジル・マリカラグーンで有効微生物（EM）を用いたバイオレメディエーションを実施し、水質改善効果を2020-2023年にモニタリングした。溶存無機窒素濃度やクロロフィルa、全有機炭素などの指標が改善し、栄養状態指数は超富栄養から中栄養へと改善したが、低酸素状態や高い栄養塩流入は続いており、バイオレメディエーションだけでは不十分で、より広範なガバナンス戦略が必要であることが示された。
English
This study monitored bioremediation using effective microorganisms (EM) in the eutrophic Maricá Lagoon, Brazil from 2020 to 2023. Indicators such as dissolved inorganic nitrogen, chlorophyll-a, and total organic carbon improved, and the Trophic State Index shifted from hypereutrophic to mesotrophic in several stations. However, persistent hypoxia and high nutrient inputs indicate that bioremediation alone is insufficient and must be integrated with broader environmental governance.
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
本論文はブラジルの事例であるが、日本の閉鎖性水域（湖沼・内湾）の水質改善にも応用可能な知見を含む。ただし、日本のGX文脈では主にカーボンニュートラルが焦点であり、直接的な関連性は限定的。
In the global GX context
This case study from Brazil demonstrates the potential of nature-based solutions for coastal lagoon restoration, relevant to global eutrophication challenges. It provides empirical evidence on bioremediation monitoring that can inform similar projects in other regions, though it does not directly address climate change mitigation.
👥 読者別の含意
🔬研究者:Provides empirical data on long-term monitoring of EM-based bioremediation and its limitations.
🏢実務担当者:Useful for water management teams considering nature-based solutions for eutrophic water bodies.
🏛政策担当者:Highlights the need for integrated governance combining bioremediation with nutrient reduction policies.
📄 Abstract（原文）
Abstract This study evaluates bioremediation using effective microorganisms (EM) to improve quality in the eutrophic Maricá Lagoon (RJ, Brazil). The intervention, implemented in late 2021, consisted of the regular application of EM in one of the lagoon’s main fluvial contributors: the Mumbuca-Ubatiba drainage basin. To evaluate bioremediation, physicochemical and biogeochemical variables were monitored in the water column and sediments from 2020 to 2023. Whereas the drainage basin was sampled monthly, the lagoon was sampled every 3 months. Dissolved inorganic nitrogen (DIN) concentrations showed strong spatial variability in the system, reaching up to 2412 µM in the eastern margin (Mumbuca-Ubatiba)—dominated by ammonium (> 80% of DIN)—and up to 234 µM in the western margin (São Bento channel), where nitrate predominated (> 70%). Chlorophyll-a concentrations declined from 240 µg L⁻ 1 in 2020 to 11.44 µg L⁻ 1 in 2023 in Mumbuca-Ubatiba basin. Improvements associated with bioremediation were more evident in sedimentary variables in the lagoon. Total organic carbon decreased from 7.79% (2021) to 2.72% (2023), while total phosphorus showed an overall decreasing trend despite a peak of 2826 mg kg⁻ 1 in August 2023. The Trophic State Index (TSI) revealed a general improvement in water quality, with conditions shifting from hypereutrophic (TSI ≥ 59.1) and supereutrophic (58.2–59.0) to mesotrophic levels (53.2–55.7) in several stations. Despite improvements, persistent hypoxia (DO < 2 mg.L −1 ) and continuous high nutrient inputs indicate that bioremediation alone is insufficient to fully restore system conditions. These findings demonstrate that EM-based bioremediation should be integrated with broader environmental governance strategies for long-term effectiveness.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1007/s10661-026-15699-yfirst seen 2026-07-26 05:21:22
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