Limnology and Oceanography Letters最新文献_第9页

Low methane emissions from nutrient-rich former river channels in a hydrologically managed dryland delta 在一个水文管理的旱地三角洲，以前营养丰富的河道的低甲烷排放

IF 5 2区地球科学

Limnology and Oceanography Letters Pub Date : 2026-05-05 DOI: 10.1002/lol2.70131

Siena Stassi, Jude A. Benavides, Chu-Lin Cheng, Marcelo Gomes da Silva, Nicholas E. Ray, Nathan Barros, Rafael M. Almeida

{"title":"Low methane emissions from nutrient-rich former river channels in a hydrologically managed dryland delta","authors":"Siena Stassi, Jude A. Benavides, Chu-Lin Cheng, Marcelo Gomes da Silva, Nicholas E. Ray, Nathan Barros, Rafael M. Almeida","doi":"10.1002/lol2.70131","DOIUrl":"https://doi.org/10.1002/lol2.70131","url":null,"abstract":"Anthropogenic stresses in dryland regions can alter hydrology, salinization, and biogeochemical processes. How these pressures influence methane (CH4) cycling and emissions from aquatic ecosystems remains poorly understood. Over the course of 1 year, we measured diffusive and ebullitive CH4 emissions from resacas—shallow, hydrologically managed distributary channels prevalent throughout the Lower Rio Grande Valley along the US–Mexico border. Despite warm, nutrient-rich waters, CH4 emissions from resacas were low, and more comparable to rates observed in estuarine systems. CH4 fluxes were positively related to temperature but negatively related to salinity and rainfall. Elevated salinity, driven by evaporation and source water from the salinized Rio Grande, may suppress methanogenesis. These findings highlight the complex interplay of salinity, hydrology, and management in shaping aquatic CH4 emissions from dryland regions. As dryland water bodies face growing salinization and warming temperatures, resacas offer valuable insight into CH4 dynamics in increasingly altered freshwater ecosystems.","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"11 3","pages":""},"PeriodicalIF":5.0,"publicationDate":"2026-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lol2.70131","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148046965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

IF 5 2区地球科学

Limnology and Oceanography Letters Pub Date : 2026-05-05

引用次数: 0

Low methane emissions from nutrient-rich former river channels in a hydrologically managed dryland delta 在一个水文管理的旱地三角洲，以前营养丰富的河道的低甲烷排放

IF 5 2区地球科学

Limnology and Oceanography Letters Pub Date : 2026-05-05 DOI: 10.1002/lol2.70131

Siena Stassi, Jude A. Benavides, Chu-Lin Cheng, Marcelo Gomes da Silva, Nicholas E. Ray, Nathan Barros, Rafael M. Almeida

{"title":"Low methane emissions from nutrient-rich former river channels in a hydrologically managed dryland delta","authors":"Siena Stassi, Jude A. Benavides, Chu-Lin Cheng, Marcelo Gomes da Silva, Nicholas E. Ray, Nathan Barros, Rafael M. Almeida","doi":"10.1002/lol2.70131","DOIUrl":"https://doi.org/10.1002/lol2.70131","url":null,"abstract":"Anthropogenic stresses in dryland regions can alter hydrology, salinization, and biogeochemical processes. How these pressures influence methane (CH4) cycling and emissions from aquatic ecosystems remains poorly understood. Over the course of 1 year, we measured diffusive and ebullitive CH4 emissions from resacas—shallow, hydrologically managed distributary channels prevalent throughout the Lower Rio Grande Valley along the US–Mexico border. Despite warm, nutrient-rich waters, CH4 emissions from resacas were low, and more comparable to rates observed in estuarine systems. CH4 fluxes were positively related to temperature but negatively related to salinity and rainfall. Elevated salinity, driven by evaporation and source water from the salinized Rio Grande, may suppress methanogenesis. These findings highlight the complex interplay of salinity, hydrology, and management in shaping aquatic CH4 emissions from dryland regions. As dryland water bodies face growing salinization and warming temperatures, resacas offer valuable insight into CH4 dynamics in increasingly altered freshwater ecosystems.","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"11 3","pages":""},"PeriodicalIF":5.0,"publicationDate":"2026-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lol2.70131","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148046966","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

IF 5 2区地球科学

Limnology and Oceanography Letters Pub Date : 2026-04-30

引用次数: 0

IF 5 2区地球科学

Limnology and Oceanography Letters Pub Date : 2026-04-30

引用次数: 0

Seasonal differences and potential biological drivers of the methane paradox in two peri-Alpine lakes 两个近高山湖泊甲烷悖论的季节差异和潜在的生物驱动因素

IF 5 2区地球科学

Limnology and Oceanography Letters Pub Date : 2026-04-30 DOI: 10.1002/lol2.70129

Niharika Sharma, Manuela Felsberger, Zeynep Kurt, Markus Möst, Barbara Bayer

{"title":"Seasonal differences and potential biological drivers of the methane paradox in two peri-Alpine lakes","authors":"Niharika Sharma, Manuela Felsberger, Zeynep Kurt, Markus Möst, Barbara Bayer","doi":"10.1002/lol2.70129","DOIUrl":"https://doi.org/10.1002/lol2.70129","url":null,"abstract":"Seasonal variations and the biological drivers underlying the methane paradox in freshwater lakes are poorly understood. Here, we investigated the relationship between subsurface methane inventories and phytoplankton in two peri-Alpine lakes across different seasons. Surface waters of both lakes were consistently saturated in methane, with maxima reaching 570 and 205 nmol L−1 during summer in the metalimnion of lakes Mondsee and Attersee, respectively. Methane concentrations were positively correlated with phytoplankton abundance in meso-oligotrophic lake Mondsee but not in ultra-oligotrophic lake Attersee. However, although phytoplankton peaked in abundance at the methane maxima in Mondsee, incubation experiments with 13C-labeled bicarbonate revealed negligible methane production from primary productivity. Instead, our results suggest that phytoplankton might only be indirectly involved in methane production through alternative pathways, or by providing precursor compounds to other members of the microbial community in these oligotrophic lakes.","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"11 3","pages":""},"PeriodicalIF":5.0,"publicationDate":"2026-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lol2.70129","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148050659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Seasonal differences and potential biological drivers of the methane paradox in two peri-Alpine lakes 两个近高山湖泊甲烷悖论的季节差异和潜在的生物驱动因素

IF 5 2区地球科学

Limnology and Oceanography Letters Pub Date : 2026-04-30 DOI: 10.1002/lol2.70129

Niharika Sharma, Manuela Felsberger, Zeynep Kurt, Markus Möst, Barbara Bayer

{"title":"Seasonal differences and potential biological drivers of the methane paradox in two peri-Alpine lakes","authors":"Niharika Sharma, Manuela Felsberger, Zeynep Kurt, Markus Möst, Barbara Bayer","doi":"10.1002/lol2.70129","DOIUrl":"https://doi.org/10.1002/lol2.70129","url":null,"abstract":"Seasonal variations and the biological drivers underlying the methane paradox in freshwater lakes are poorly understood. Here, we investigated the relationship between subsurface methane inventories and phytoplankton in two peri-Alpine lakes across different seasons. Surface waters of both lakes were consistently saturated in methane, with maxima reaching 570 and 205 nmol L−1 during summer in the metalimnion of lakes Mondsee and Attersee, respectively. Methane concentrations were positively correlated with phytoplankton abundance in meso-oligotrophic lake Mondsee but not in ultra-oligotrophic lake Attersee. However, although phytoplankton peaked in abundance at the methane maxima in Mondsee, incubation experiments with 13C-labeled bicarbonate revealed negligible methane production from primary productivity. Instead, our results suggest that phytoplankton might only be indirectly involved in methane production through alternative pathways, or by providing precursor compounds to other members of the microbial community in these oligotrophic lakes.","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"11 3","pages":""},"PeriodicalIF":5.0,"publicationDate":"2026-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lol2.70129","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148050660","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Divergent responses of the diatom Thalassiosira weissflogii to ocean acidification during light and dark periods 光照期和黑暗期硅藻对海洋酸化的不同响应

IF 5 2区地球科学

Limnology and Oceanography Letters Pub Date : 2026-04-26 DOI: 10.1002/lol2.70128

Guang Gao, Liming Qu, Jingke Ge, Kunshan Gao

{"title":"Divergent responses of the diatom Thalassiosira weissflogii to ocean acidification during light and dark periods","authors":"Guang Gao, Liming Qu, Jingke Ge, Kunshan Gao","doi":"10.1002/lol2.70128","DOIUrl":"10.1002/lol2.70128","url":null,"abstract":"Given the limited understanding of discrepancies in responses of diatoms to ocean acidification (OA), we comparatively investigated the physiological and transcriptional performances of a diatom Thalassiosira weissflogii acclimated to OA (pHt drop of 0.35–0.41) between day and night periods. We found that OA enhanced its specific growth rate (up to 10%) in the light period by upregulating light reaction, Calvin cycle and H+ pumps to cope with the decreased pH. On the other hand, OA reduced its apparent specific growth rate (14%) in the dark period due to additive pH drop caused by OA-enhanced respiratory CO2 release. In the dark period, the cells could not effectively cope with the decreased pH since H+ pumps were downregulated. Consequently, OA did not affect cell growth during a 24 h diel cycle. These findings suggest that daytime positive and night negative effects of OA on diatoms could be responsible for differential results observed under different conditions, with implications for possible seasonal and latitudinal effects of OA.","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"11 3","pages":""},"PeriodicalIF":5.0,"publicationDate":"2026-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lol2.70128","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147751667","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

IF 5 2区地球科学

Limnology and Oceanography Letters Pub Date : 2026-04-26

引用次数: 0

IF 5 2区地球科学

Limnology and Oceanography Letters Pub Date : 2026-04-26

引用次数: 0