Limnology and Oceanography最新文献_第2页

Soil carbon dioxide levels control salt marsh alkalinity generation

IF 4.5 1区地球科学

Limnology and Oceanography Pub Date : 2025-04-23 DOI: 10.1002/lno.70062

Panunporn Tutiyasarn, Peter Mueller, Gibran Romero‐Mujalli, Bryce Van Dam, Jens Hartmann, Philipp Porada

{"title":"Soil carbon dioxide levels control salt marsh alkalinity generation","authors":"Panunporn Tutiyasarn, Peter Mueller, Gibran Romero‐Mujalli, Bryce Van Dam, Jens Hartmann, Philipp Porada","doi":"10.1002/lno.70062","DOIUrl":"https://doi.org/10.1002/lno.70062","url":null,"abstract":"Recent studies have highlighted salt marshes as hotspots for alkalinity generation and export to coastal waters. Several studies emphasize the critical role of anaerobic microbial metabolism as a major source of total alkalinity (TA) generation in marsh soils. However, the contribution of mineral dissolution to salt marsh TA generation has yet to be extensively studied from a mechanistic viewpoint. Therefore, we conducted a lab‐based soil column experiment to investigate the influence of soil pCO2 levels on TA generation in organic‐poor minerogenic salt marsh soils, considering their significance in soil mineral dissolution. Results showed a maximum TA increase of up to twofold when the pCO2 level was increased from 440 to 150,000 μatm. The relationship between TA and net Ca2+ release was 1.73, close to the theoretical stoichiometric ratio of HCO3− to Ca2+ for calcium carbonate dissolution. In addition, the net release of dissolved silica responded significantly to the change in soil pCO2. Therefore, calcium carbonate dissolution was identified as the possible dominant driving force behind TA generation in the minerogenic salt marsh soil, with an additional contribution from silicate minerals. We suggest high pCO2 levels, such as the rhizosphere, might be the hotspot for alkalinity generation via mineral dissolution. Our findings advance the mechanistic understanding of TA generation in salt marshes and highlight the importance of the overlooked role of inorganic carbon. Evaluating the contribution of blue carbon ecosystems to alkalinity production is essential for integrating the roles of both organic and inorganic carbon into climate mitigation assessments.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"17 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143866927","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Correction to “Environmental and ecological drivers of harmful algal blooms revealed by automated underwater microscopy”

IF 4.5 1区地球科学

Limnology and Oceanography Pub Date : 2025-04-15 DOI: 10.1002/lno.70057

引用次数: 0

Large sediment methane production potential in reservoirs compared to lakes and rivers 与湖泊和河流相比，水库沉积物甲烷生产潜力大

IF 4.5 1区地球科学

Limnology and Oceanography Pub Date : 2025-04-14 DOI: 10.1002/lno.70063

Pascal Bodmer, Christoph Bors, Liu Liu, Andreas Lorke

{"title":"Large sediment methane production potential in reservoirs compared to lakes and rivers","authors":"Pascal Bodmer, Christoph Bors, Liu Liu, Andreas Lorke","doi":"10.1002/lno.70063","DOIUrl":"https://doi.org/10.1002/lno.70063","url":null,"abstract":"Inland waters emit a globally significant amount of methane (CH4) into the atmosphere. Measurements of potential CH4 production rates in the sediment can help constrain the magnitude of CH4 sources and time‐averaged emission rates. We explored the magnitude, variability, and drivers of potential CH4 production rates in the sediment, based on compiled measurements (238 sediment cores from 72 aquatic systems) following a standardized laboratory incubation procedure. The data reveal > 4‐fold higher potential CH4 production rates in reservoir sediments than lakes and > 14‐fold higher than rivers after being standardized for temperature. Sediment organic carbon content and depth below the sediment–water interface are universal drivers for potential CH4 production rates across freshwater ecosystems. The disproportional high CH4 production rate in sediments from human‐made water bodies calls for more comprehensive monitoring of their CH4 emissions to inform carbon footprint and inventory efforts. This first meta‐analysis of potential CH4 production rates in sediments from different types of freshwater aquatic systems may help with process‐based modeling of CH4 emissions from individual water bodies in larger‐scale assessments.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"7 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143832519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Long‐range transport of terrestrial particulate organic carbon to the open ocean by sediment resuspension 沉积物再悬浮将陆地颗粒有机碳远距离迁移到公海

IF 4.5 1区地球科学

Limnology and Oceanography Pub Date : 2025-04-14 DOI: 10.1002/lno.70059

Hyekyung Park, Hanbyul Lee, Nahyeon Kwon, Sojin Park, Jihyun Park, Weol Ae Lim, Guebuem Kim

{"title":"Long‐range transport of terrestrial particulate organic carbon to the open ocean by sediment resuspension","authors":"Hyekyung Park, Hanbyul Lee, Nahyeon Kwon, Sojin Park, Jihyun Park, Weol Ae Lim, Guebuem Kim","doi":"10.1002/lno.70059","DOIUrl":"https://doi.org/10.1002/lno.70059","url":null,"abstract":"The transport of particulate organic carbon (POC) from land to deep‐sea sediments is a critical component of the global carbon cycle. However, the transport processes of terrestrial POC across continental shelves remain poorly understood due to the complexity of these systems. In this study, we investigated the vertical fluxes and fates of terrestrial vs. marine POC using stable carbon isotope ratios (δ13C) and 234Th tracers along two transects in the southern coastal region of Korea. The POC concentrations were highest in the surface layer and decreased with depth, with a slight increase near the seafloor. The δ13C values revealed that terrestrial POC contributed 29% ± 24% of the total POC, with higher contributions at the innermost stations and in the bottom layer. Based on 234Th–238U disequilibria, the residence times of particulate 234Th (8.1 ± 3.6 d) were significantly longer than those of dissolved 234Th (3.7 ± 2.2 d). The much higher vertical fluxes of terrestrial POC in the deeper layer relative to the upper layer suggest that terrestrial POC undergoes multiple turnover cycles through sediment resuspension before burial, while marine POC degrades preferentially in the course of settling. These findings highlight that effective sediment resuspension and the refractory nature of terrestrial POC allow for its long‐range transport (> 200 km) to the deep Ulleung Basin in the East Sea (Japan Sea). This study sheds new light on the mechanisms driving the transport of terrestrial POC from coastal regions to the deep ocean.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"40 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143832518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nutrient inversion but not warming drive changes in periphyton biomass and composition in shallow lake mesocosms 营养反转而非气候变暖驱动浅湖中观模型中的浮游生物生物量和组成发生变化

IF 4.5 1区地球科学

Limnology and Oceanography Pub Date : 2025-04-14 DOI: 10.1002/lno.70053

Olivera Stamenković, Juan Pablo Pacheco, Eti E. Levi, Erik Jeppesen, Thomas Alexander Davidson

{"title":"Nutrient inversion but not warming drive changes in periphyton biomass and composition in shallow lake mesocosms","authors":"Olivera Stamenković, Juan Pablo Pacheco, Eti E. Levi, Erik Jeppesen, Thomas Alexander Davidson","doi":"10.1002/lno.70053","DOIUrl":"https://doi.org/10.1002/lno.70053","url":null,"abstract":"Periphyton plays an important functional role in shallow lakes and is sensitive to variation in nutrient availability and global warming. Understanding the responses of periphyton to changes in nutrient availability in contrasting warming scenarios can contribute to the development of more efficient techniques for the restoration of lakes in a future warmer world. We analyzed the periphyton response to early eutrophication and oligotrophication under three different warming scenarios and explored the associated environmental drivers of periphyton in 24 shallow lake mesocosms. These were initially set up in 2003 with two nutrient treatments (with or without nutrient addition) and three temperatures (ambient, A2 IPCC scenario and A2 increased by 50%) following a full factorial design. In 2023, the nutrient treatment was inverted, starting nutrient addition in low nutrient mesocosms (nutrient increase) and stopping nutrient addition (nutrient decrease) in the remaining. Artificial plants were placed in each mesocosm to allow periphyton to develop for 21 d, both before and after the inversion of the nutrient treatments. We found marked changes in periphyton biomass and composition to the nutrient inversion, but no response to warming. Nutrient decrease induced lower periphyton biomass and compositional changes at species and group levels. Nutrient increase had no effect on biomass accrual or species composition but altered the group composition. Our results suggest that lower nitrate availability was a crucial factor driving biomass and compositional changes with the cessation of nutrient addition, while a combination of environmental variables explained the altered periphyton group composition in the nutrient increase treatment.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"27 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143832520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Stratification stability of tropical lakes and their sensitivity to climate 热带湖泊的分层稳定性及其对气候的敏感性

IF 4.5 1区地球科学

Limnology and Oceanography Pub Date : 2025-04-14 DOI: 10.1002/lno.70055

Tongyao Pu, G. Douglas Haffner, Sean A. Crowe, Sergei Katsev

{"title":"Stratification stability of tropical lakes and their sensitivity to climate","authors":"Tongyao Pu, G. Douglas Haffner, Sean A. Crowe, Sergei Katsev","doi":"10.1002/lno.70055","DOIUrl":"https://doi.org/10.1002/lno.70055","url":null,"abstract":"Tropical lakes experience less thermal convection than temperate lakes and can be stably stratified by temperature gradients alone. Deep tropical lakes are often presumed meromictic, but conditions for sustained meromixis are poorly constrained. Here, we investigate the stratification stability of a deep (200 m) tropical Lake Towuti (Indonesia) and analyze its sensitivity to meteorological and climatic parameters using exploratory hydrodynamic simulations. The inferred effects on water chemistry are further evaluated with a reactive‐transport biogeochemical model. In contrast to the previous assumption of meromixis, our results suggest that in 2008 Lake Towuti experienced mixing over most of its water column, with the attendant weak oxygenation of the previously anoxic lower strata. The lake likely remained stratified afterwards, but the chemical distributions measured after the episode, particularly during the International Continental Scientific Drilling Program in 2015, were out of steady state, and may be still evolving in time. We find the thermal stratification to be most sensitive to average air temperatures and wind speeds and predict further stabilization of the lake by climate change. We also describe a negative feedback mechanism that can stabilize oligomictic tropical lakes for a number of years after the episodes of mixing and cooling, and infer that such episodes should be significantly less frequent in deeper lakes.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"4 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143832517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Role of virus‐mediated lysis in spatiotemporal dynamics of prokaryotic communities in river–estuary–coastal ecosystems 病毒介导的溶解在河流-河口-海岸生态系统原核生物群落时空动态中的作用

IF 4.5 1区地球科学

Limnology and Oceanography Pub Date : 2025-04-14 DOI: 10.1002/lno.70051

Lu Liu, Qi Chen, Jiaxin Chen, Nengwang Chen, Kevin Xu Zhong, Qiang Zheng

{"title":"Role of virus‐mediated lysis in spatiotemporal dynamics of prokaryotic communities in river–estuary–coastal ecosystems","authors":"Lu Liu, Qi Chen, Jiaxin Chen, Nengwang Chen, Kevin Xu Zhong, Qiang Zheng","doi":"10.1002/lno.70051","DOIUrl":"https://doi.org/10.1002/lno.70051","url":null,"abstract":"Viral lysis accounts for approximately 50% of prokaryotic mortality, significantly influencing the diversity, composition, and succession of prokaryotic communities. Despite its importance, the specific influence of viral lysis on seasonal dynamics within aquatic ecosystems remains poorly understood. In this study, we investigated the seasonal dynamics of prokaryotes in the river–estuary–coastal ecosystem surrounding Xiamen Island and explored the environmental factors and virus‐mediated cell lysis driving microbial seasonal successions across spatiotemporal scales. A taxon‐specific cell lysis was applied to evaluate the contribution of viral lysis to seasonal variations in prokaryotes. Our findings revealed distinct spatiotemporal successions within the prokaryotic community structure, where temporal‐related factors, spatial‐related factors, and virus‐mediated cell lysis contribute comparably to the seasonal variation of prokaryotes. The viral lysis controls on prokaryotic structures were determined by a significant negative correlation between the total microbial community and the cell lysis index (CLI) from amplicon sequence variant (ASV) to order levels. Viral lytic shaping on prokaryotic communities was more pronounced in the estuary–coastal compared to the river region, with similar seasonal variations noted. Specific ASVs, such as ASV3 (Nitrosopumilales), ASV2 (Synechococcales), ASV16 (Nitrosopumilales), and ASV17 (Oceanospirillales) were significantly correlated with CLI, highlighting the pivotal role of viral lysis in their seasonal succession. This study highlights the intricate interplay between microbial populations and viral lysis across spatiotemporal scales, enhancing our understanding of how top‐down (virus‐mediated cell lysis) and bottom‐up (environmental factors) controls drive the seasonal variations in prokaryotic communities.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"3 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143832521","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Correction to “Cascading, interactive, and indirect effects of climate change on aquatic communities, habitats, and ecosystems”

IF 4.5 1区地球科学

Limnology and Oceanography Pub Date : 2025-04-10 DOI: 10.1002/lno.70044

引用次数: 0

Temperature‐dependent growth and activity in a globally distributed nitrogen‐fixing haptophyte 一种全球分布的固氮合生藻的生长和活动与温度有关

IF 4.5 1区地球科学

Limnology and Oceanography Pub Date : 2025-04-09 DOI: 10.1002/lno.70050

Esther Wing Kwan Mak, Kendra A. Turk‐Kubo, Anna V. Voznyuk, Mary R. Gradoville, Tyler Coale, Kyoko Hagino, Jonathan P. Zehr

{"title":"Temperature‐dependent growth and activity in a globally distributed nitrogen‐fixing haptophyte","authors":"Esther Wing Kwan Mak, Kendra A. Turk‐Kubo, Anna V. Voznyuk, Mary R. Gradoville, Tyler Coale, Kyoko Hagino, Jonathan P. Zehr","doi":"10.1002/lno.70050","DOIUrl":"https://doi.org/10.1002/lno.70050","url":null,"abstract":"Dinitrogen (N2)‐fixing microorganisms play a crucial role in supplying nitrogen (N) to the oceans by converting atmospheric N2 into bioavailable N. N2 fixation was thought to be limited to warm oligotrophic ocean waters, but the association between the N2‐fixing UCYN‐A cyanobacterium and specific haptophytes, including Braarudosphaera bigelowii and relatives, has been found in diverse ocean environments, including warm subtropical gyres, temperate coastal systems, and cold polar waters. UCYN‐A2, previously known as the symbiont of B. bigelowii, and now considered an early‐stage organelle that exchanges fixed nitrogen for fixed carbon, has only recently been cultured. This study investigated the growth and activity of B. bigelowii in response to a range of temperatures to better understand its global distribution and ecology. Incubation experiments were conducted with B. bigelowii to determine growth rates, carbon (C) and N2 fixation rates, and cell sizes across a temperature range of 6–26°C. Growth rates were highest between 10°C and 22°C and lowest at 6°C and 26°C. Significant positive correlations were found between cell count‐based growth rates, C‐specific and N‐specific growth rates. Braarudosphaera bigelowii cell size increased at low temperatures. The growth and metabolic activity detected across a wide range of temperatures help to explain the wide geographic distribution of B. bigelowii. This study presents the first growth and activity measurements under a range of temperatures from B. bigelowii, providing vital information needed to understand the unique ecology of this organism and to parameterize its activity in ecosystem models.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"24 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143805828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Trophic strategies of freshwater nanoflagellates under variable run‐off scenarios

IF 4.5 1区地球科学

Limnology and Oceanography Pub Date : 2025-04-09 DOI: 10.1002/lno.70054

Katerina Symiakaki, Stella A. Berger, Gabriela Ágreda‐López, Bence Buttyán, Bence Gergácz, Silke Langenheder, Jens C. Nejstgaard

{"title":"Trophic strategies of freshwater nanoflagellates under variable run‐off scenarios","authors":"Katerina Symiakaki, Stella A. Berger, Gabriela Ágreda‐López, Bence Buttyán, Bence Gergácz, Silke Langenheder, Jens C. Nejstgaard","doi":"10.1002/lno.70054","DOIUrl":"https://doi.org/10.1002/lno.70054","url":null,"abstract":"Terrestrial run‐off is increasing in temperate lakes due to climate change and can lead to loading of colored dissolved organic matter (cDOM) and nutrients, thus reducing light availability and increasing carbon, nitrogen, and phosphorus. Run‐off events are highly irregular, resulting in temporal resource variability that may determine the energy flow in planktonic communities. To understand the effects of run‐off variability on natural plankton communities, we conducted a mesocosm experiment at SITES AquaNet in Lake Erken, Sweden. Treated mesocosms received equal total amount of cDOM and nutrients but at different frequencies and magnitudes (Daily, Intermittent, Extreme), while keeping an untreated Control. Here, we performed three surrogate prey incubation experiments with fluorescently labeled bacteria in the mesocosms to study the trophic strategies of nanoflagellates under the run‐off scenarios. Our results show that phototrophic nanoflagellates increased under Daily and Intermittent additions of cDOM and nutrients at early stages but declined thereafter, likely due to light limitation and grazing by rotifers. Heterotrophic nanoflagellate biovolume was highest in the beginning, while the grazing rate on bacteria was highest in the middle of the experiment when bacterial abundance was highest. The mixotrophic nanoflagellate abundance was generally low and unaffected by the treatments, despite high bacterial densities and reduced light, while the highest abundance was found in the Control. The overall development of nanoflagellates was modulated by microzooplankton grazing pressure over time. Our study contributes to better understanding the influence of future global change, including variable terrestrial run‐off scenarios, on food‐web interactions considering both bottom‐up and top‐down processes.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"97 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143813440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0