Long-Term Euxinia Restricts Microbial Methane Removal in Eutrophic Coastal Basins
In eutrophic coastal waters, aerobic methane-oxidizing bacteria (MOB) mitigate methane emissions by oxidizing benthic methane even in the stratified, anoxic water column. However, ongoing warming and eutrophication lead to extended stratification periods, enhancing anoxic and sulfidic conditions (eu...
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2025
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| _version_ | 1852015952096395264 |
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| author | Jessica Venetz (14507216) |
| author2 | Nicky Dotsios (18768608) Olga M. Żygadłowska (18768605) Wytze K. Lenstra (6838325) Niels A.G.M van Helmond (22391360) Christoph Humborg (1279389) Katherine D. McMahon (9072317) Dina in ’t Zandt (22391363) Caroline P. Slomp (405748) Mike S. M. Jetten (6877589) Annelies J. Veraart (12331385) |
| author2_role | author author author author author author author author author author |
| author_facet | Jessica Venetz (14507216) Nicky Dotsios (18768608) Olga M. Żygadłowska (18768605) Wytze K. Lenstra (6838325) Niels A.G.M van Helmond (22391360) Christoph Humborg (1279389) Katherine D. McMahon (9072317) Dina in ’t Zandt (22391363) Caroline P. Slomp (405748) Mike S. M. Jetten (6877589) Annelies J. Veraart (12331385) |
| author_role | author |
| dc.creator.none.fl_str_mv | Jessica Venetz (14507216) Nicky Dotsios (18768608) Olga M. Żygadłowska (18768605) Wytze K. Lenstra (6838325) Niels A.G.M van Helmond (22391360) Christoph Humborg (1279389) Katherine D. McMahon (9072317) Dina in ’t Zandt (22391363) Caroline P. Slomp (405748) Mike S. M. Jetten (6877589) Annelies J. Veraart (12331385) |
| dc.date.none.fl_str_mv | 2025-10-08T11:35:49Z |
| dc.identifier.none.fl_str_mv | 10.1021/acs.est.5c05066.s005 |
| dc.relation.none.fl_str_mv | https://figshare.com/articles/dataset/Long-Term_Euxinia_Restricts_Microbial_Methane_Removal_in_Eutrophic_Coastal_Basins/30305564 |
| dc.rights.none.fl_str_mv | CC BY-NC 4.0 info:eu-repo/semantics/openAccess |
| dc.subject.none.fl_str_mv | Biochemistry Neuroscience Pharmacology Ecology Inorganic Chemistry Mental Health Environmental Sciences not elsewhere classified Biological Sciences not elsewhere classified positive feedback loop overall bacterial diversity microbial network connectivity euxinic bottom water extended stratification periods anoxic water column persistent euxinic conditions eutrophic coastal waters eutrophic coastal basins mitigate methane emissions higher methane emissions mob relative abundance prolonged stratification enhancing anoxic sulfidic conditions redox conditions methane biofilter aerobic methane term euxinia summer 2022 sulfide accumulation stockholm archipelago simultaneous shift oxidizing bacteria ongoing warming narrow oxycline likely following global warming findings highlight filtering potential eutrophication lead |
| dc.title.none.fl_str_mv | Long-Term Euxinia Restricts Microbial Methane Removal in Eutrophic Coastal Basins |
| dc.type.none.fl_str_mv | Dataset info:eu-repo/semantics/publishedVersion dataset |
| description | In eutrophic coastal waters, aerobic methane-oxidizing bacteria (MOB) mitigate methane emissions by oxidizing benthic methane even in the stratified, anoxic water column. However, ongoing warming and eutrophication lead to extended stratification periods, enhancing anoxic and sulfidic conditions (euxinia), potentially affecting methane removal capacity. Here we compared overall water column methane removal between sites with irregular, seasonal and longer-term euxinia in the Stockholm Archipelago during summer 2022. The highest water–air methane emissions, bottom water–methane and sulfide accumulation, and the lowest methane oxidation potential were observed under longer-term euxinic bottom water conditions. While MOB relative abundance and potential activity indicated high functioning of the methane biofilter in the seasonally euxinic bottom water layer, the methane-filtering potential was much lower in the longer-term euxinic bottom water. Under persistent euxinic conditions, overall bacterial diversity and microbial network connectivity were lower, likely following a simultaneous shift in redox conditions and a shift toward anaerobic sulfur-cycling. This shift may force MOB to retreat from the euxinic bottom water into the narrow oxycline, reducing the capacity of the methane biofilter and resulting in higher methane emissions. These findings highlight the positive feedback loop that can further amplify oceanic methane emissions, particularly from eutrophic and shallow coastal waters prone to prolonged stratification under global warming. |
| eu_rights_str_mv | openAccess |
| id | Manara_eeedeb8bebc8d53463e929bdceaffc1a |
| identifier_str_mv | 10.1021/acs.est.5c05066.s005 |
| network_acronym_str | Manara |
| network_name_str | ManaraRepo |
| oai_identifier_str | oai:figshare.com:article/30305564 |
| publishDate | 2025 |
| repository.mail.fl_str_mv | |
| repository.name.fl_str_mv | |
| repository_id_str | |
| rights_invalid_str_mv | CC BY-NC 4.0 |
| spelling | Long-Term Euxinia Restricts Microbial Methane Removal in Eutrophic Coastal BasinsJessica Venetz (14507216)Nicky Dotsios (18768608)Olga M. Żygadłowska (18768605)Wytze K. Lenstra (6838325)Niels A.G.M van Helmond (22391360)Christoph Humborg (1279389)Katherine D. McMahon (9072317)Dina in ’t Zandt (22391363)Caroline P. Slomp (405748)Mike S. M. Jetten (6877589)Annelies J. Veraart (12331385)BiochemistryNeurosciencePharmacologyEcologyInorganic ChemistryMental HealthEnvironmental Sciences not elsewhere classifiedBiological Sciences not elsewhere classifiedpositive feedback loopoverall bacterial diversitymicrobial network connectivityeuxinic bottom waterextended stratification periodsanoxic water columnpersistent euxinic conditionseutrophic coastal waterseutrophic coastal basinsmitigate methane emissionshigher methane emissionsmob relative abundanceprolonged stratificationenhancing anoxicsulfidic conditionsredox conditionsmethane biofilteraerobic methaneterm euxiniasummer 2022sulfide accumulationstockholm archipelagosimultaneous shiftoxidizing bacteriaongoing warmingnarrow oxyclinelikely followingglobal warmingfindings highlightfiltering potentialeutrophication leadIn eutrophic coastal waters, aerobic methane-oxidizing bacteria (MOB) mitigate methane emissions by oxidizing benthic methane even in the stratified, anoxic water column. However, ongoing warming and eutrophication lead to extended stratification periods, enhancing anoxic and sulfidic conditions (euxinia), potentially affecting methane removal capacity. Here we compared overall water column methane removal between sites with irregular, seasonal and longer-term euxinia in the Stockholm Archipelago during summer 2022. The highest water–air methane emissions, bottom water–methane and sulfide accumulation, and the lowest methane oxidation potential were observed under longer-term euxinic bottom water conditions. While MOB relative abundance and potential activity indicated high functioning of the methane biofilter in the seasonally euxinic bottom water layer, the methane-filtering potential was much lower in the longer-term euxinic bottom water. Under persistent euxinic conditions, overall bacterial diversity and microbial network connectivity were lower, likely following a simultaneous shift in redox conditions and a shift toward anaerobic sulfur-cycling. This shift may force MOB to retreat from the euxinic bottom water into the narrow oxycline, reducing the capacity of the methane biofilter and resulting in higher methane emissions. These findings highlight the positive feedback loop that can further amplify oceanic methane emissions, particularly from eutrophic and shallow coastal waters prone to prolonged stratification under global warming.2025-10-08T11:35:49ZDatasetinfo:eu-repo/semantics/publishedVersiondataset10.1021/acs.est.5c05066.s005https://figshare.com/articles/dataset/Long-Term_Euxinia_Restricts_Microbial_Methane_Removal_in_Eutrophic_Coastal_Basins/30305564CC BY-NC 4.0info:eu-repo/semantics/openAccessoai:figshare.com:article/303055642025-10-08T11:35:49Z |
| spellingShingle | Long-Term Euxinia Restricts Microbial Methane Removal in Eutrophic Coastal Basins Jessica Venetz (14507216) Biochemistry Neuroscience Pharmacology Ecology Inorganic Chemistry Mental Health Environmental Sciences not elsewhere classified Biological Sciences not elsewhere classified positive feedback loop overall bacterial diversity microbial network connectivity euxinic bottom water extended stratification periods anoxic water column persistent euxinic conditions eutrophic coastal waters eutrophic coastal basins mitigate methane emissions higher methane emissions mob relative abundance prolonged stratification enhancing anoxic sulfidic conditions redox conditions methane biofilter aerobic methane term euxinia summer 2022 sulfide accumulation stockholm archipelago simultaneous shift oxidizing bacteria ongoing warming narrow oxycline likely following global warming findings highlight filtering potential eutrophication lead |
| status_str | publishedVersion |
| title | Long-Term Euxinia Restricts Microbial Methane Removal in Eutrophic Coastal Basins |
| title_full | Long-Term Euxinia Restricts Microbial Methane Removal in Eutrophic Coastal Basins |
| title_fullStr | Long-Term Euxinia Restricts Microbial Methane Removal in Eutrophic Coastal Basins |
| title_full_unstemmed | Long-Term Euxinia Restricts Microbial Methane Removal in Eutrophic Coastal Basins |
| title_short | Long-Term Euxinia Restricts Microbial Methane Removal in Eutrophic Coastal Basins |
| title_sort | Long-Term Euxinia Restricts Microbial Methane Removal in Eutrophic Coastal Basins |
| topic | Biochemistry Neuroscience Pharmacology Ecology Inorganic Chemistry Mental Health Environmental Sciences not elsewhere classified Biological Sciences not elsewhere classified positive feedback loop overall bacterial diversity microbial network connectivity euxinic bottom water extended stratification periods anoxic water column persistent euxinic conditions eutrophic coastal waters eutrophic coastal basins mitigate methane emissions higher methane emissions mob relative abundance prolonged stratification enhancing anoxic sulfidic conditions redox conditions methane biofilter aerobic methane term euxinia summer 2022 sulfide accumulation stockholm archipelago simultaneous shift oxidizing bacteria ongoing warming narrow oxycline likely following global warming findings highlight filtering potential eutrophication lead |