Eutrophication and urbanization enhance methane emissions from coastal lagoons
Abstract Coastal lagoons are important nutrient filters and carbon sinks but may release large amounts of methane (CH4) to the atmosphere. Here, we hypothesize that eutrophication and population density will turn coastal lagoons into stronger methane emitters. We report benthic fluxes from 187 sedim...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2025-02-01
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| Series: | Limnology and Oceanography Letters |
| Online Access: | https://doi.org/10.1002/lol2.10430 |
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| author | Stefano Bonaglia Henry L. S. Cheung Tobia Politi Irma Vybernaite‐Lubiene Tristan McKenzie Isaac R. Santos Mindaugas Zilius |
| author_facet | Stefano Bonaglia Henry L. S. Cheung Tobia Politi Irma Vybernaite‐Lubiene Tristan McKenzie Isaac R. Santos Mindaugas Zilius |
| author_sort | Stefano Bonaglia |
| collection | DOAJ |
| description | Abstract Coastal lagoons are important nutrient filters and carbon sinks but may release large amounts of methane (CH4) to the atmosphere. Here, we hypothesize that eutrophication and population density will turn coastal lagoons into stronger methane emitters. We report benthic fluxes from 187 sediment cores incubated from three of the largest European lagoons suffering persistent eutrophication. Methane fluxes were mainly driven by sediment porosity, organic matter, and dissolved inorganic carbon (DIC) fluxes. Methane was always supersaturated (250–49,000%) in lagoon waters leading to large, variable emissions of 0.04–26 mg CH4 m−2 d−1. Combining our new dataset with earlier estimates revealed a global coastal lagoon emission of 7.9 (1.4–34.7) Tg CH4 yr−1 with median values of 5.4 mg CH4 m−2 d−1. Lagoons with very highly populated catchments released much more methane (223 mg CH4 m−2 d−1). Overall, projected increases in eutrophication, organic loading and population densities will enhance methane fluxes from lagoons worldwide. |
| format | Article |
| id | doaj-art-787345ff495646ac8a5c1c1985523c9b |
| institution | Kabale University |
| issn | 2378-2242 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Wiley |
| record_format | Article |
| series | Limnology and Oceanography Letters |
| spelling | doaj-art-787345ff495646ac8a5c1c1985523c9b2025-01-21T13:51:58ZengWileyLimnology and Oceanography Letters2378-22422025-02-0110114015010.1002/lol2.10430Eutrophication and urbanization enhance methane emissions from coastal lagoonsStefano Bonaglia0Henry L. S. Cheung1Tobia Politi2Irma Vybernaite‐Lubiene3Tristan McKenzie4Isaac R. Santos5Mindaugas Zilius6Department of Marine Sciences University of Gothenburg Gothenburg SwedenDepartment of Marine Sciences University of Gothenburg Gothenburg SwedenDepartment of Marine Sciences University of Gothenburg Gothenburg SwedenMarine Research Institute, Klaipeda University Klaipeda LithuaniaDepartment of Marine Sciences University of Gothenburg Gothenburg SwedenDepartment of Marine Sciences University of Gothenburg Gothenburg SwedenMarine Research Institute, Klaipeda University Klaipeda LithuaniaAbstract Coastal lagoons are important nutrient filters and carbon sinks but may release large amounts of methane (CH4) to the atmosphere. Here, we hypothesize that eutrophication and population density will turn coastal lagoons into stronger methane emitters. We report benthic fluxes from 187 sediment cores incubated from three of the largest European lagoons suffering persistent eutrophication. Methane fluxes were mainly driven by sediment porosity, organic matter, and dissolved inorganic carbon (DIC) fluxes. Methane was always supersaturated (250–49,000%) in lagoon waters leading to large, variable emissions of 0.04–26 mg CH4 m−2 d−1. Combining our new dataset with earlier estimates revealed a global coastal lagoon emission of 7.9 (1.4–34.7) Tg CH4 yr−1 with median values of 5.4 mg CH4 m−2 d−1. Lagoons with very highly populated catchments released much more methane (223 mg CH4 m−2 d−1). Overall, projected increases in eutrophication, organic loading and population densities will enhance methane fluxes from lagoons worldwide.https://doi.org/10.1002/lol2.10430 |
| spellingShingle | Stefano Bonaglia Henry L. S. Cheung Tobia Politi Irma Vybernaite‐Lubiene Tristan McKenzie Isaac R. Santos Mindaugas Zilius Eutrophication and urbanization enhance methane emissions from coastal lagoons Limnology and Oceanography Letters |
| title | Eutrophication and urbanization enhance methane emissions from coastal lagoons |
| title_full | Eutrophication and urbanization enhance methane emissions from coastal lagoons |
| title_fullStr | Eutrophication and urbanization enhance methane emissions from coastal lagoons |
| title_full_unstemmed | Eutrophication and urbanization enhance methane emissions from coastal lagoons |
| title_short | Eutrophication and urbanization enhance methane emissions from coastal lagoons |
| title_sort | eutrophication and urbanization enhance methane emissions from coastal lagoons |
| url | https://doi.org/10.1002/lol2.10430 |
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