Limnology and Oceanography最新文献_第6页

Trait‐based responses of nitrogen‐fixing cyanobacteria to nitrogen limitation and light availability: Insights from 45 years of monitoring 固氮蓝藻对氮限制和光可用性的性状响应：来自45年监测的见解

IF 4.5 1区地球科学

Limnology and Oceanography Pub Date : 2026-08-22 DOI: 10.1002/lno.70462

Jordan A. Facey, Jan Köhler

{"title":"Trait‐based responses of nitrogen‐fixing cyanobacteria to nitrogen limitation and light availability: Insights from 45 years of monitoring","authors":"Jordan A. Facey, Jan Köhler","doi":"10.1002/lno.70462","DOIUrl":"https://doi.org/10.1002/lno.70462","url":null,"abstract":"The degree to which N 2 ‐fixation compensates for reduced external nitrogen loading has significant implications for eutrophication recovery. We analyzed 45 years of monitoring data from the shallow, polymictic Lake Müggelsee during which external P‐ and N‐loading declined by about 80% and there were extended periods of N‐limitation in summer. Contrary to expectations, decreasing N availability resulted in significant and prolonged reductions in the biomass of N 2 ‐fixing cyanobacteria of order Nostocales, leading to decreased total heterocyte concentration. Differences were observed within the Nostocales community, as periods of Aphanizomenon dominance were characterized by greater DIN and low light availability. Dolichospermum was more competitive in low DIN conditions, albeit at lower biomasses than previous Aphanizomenon blooms, indicating a significant growth penalty when utilizing N 2 ‐fixation. Increased light availability on account of biomass reductions appeared to facilitate heterocyte production, particularly by Dolichospermum , which produced more heterocytes under a narrower range of DIN concentrations compared to Aphanizomenon , which generally produced fewer heterocytes and formation often preceded growth limiting DIN concentrations. Nutrient supply conditions likely dictate the success of each strategy. Regression tree analyses indicated that light and temperature strongly regulate heterocyte production. Together, these results indicate that compensation of reduced external N‐loading by N 2 ‐fixation was low and heavily dependent on the lakes thermal and light regime, which in turn influences community composition.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"50 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2026-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148768336","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

Remotely sensed lake color measurements suggest strong seasonal yet limited multi-decadal trends in turbid and productive lakes in the Nebraska Sandhills 遥感湖泊颜色测量表明，内布拉斯加州沙丘浑浊和多产的湖泊具有强烈的季节性但有限的多年代际趋势

IF 3.5 1区地球科学

Limnology and Oceanography Pub Date : 2026-08-20 DOI: 10.1002/lno.70483

Daniel Gschwentner, Carly R. Olson, Jessica R. Corman

{"title":"Remotely sensed lake color measurements suggest strong seasonal yet limited multi-decadal trends in turbid and productive lakes in the Nebraska Sandhills","authors":"Daniel Gschwentner, Carly R. Olson, Jessica R. Corman","doi":"10.1002/lno.70483","DOIUrl":"10.1002/lno.70483","url":null,"abstract":"Long-term monitoring of lakes is necessary to detect and determine drivers of water quality impairment and ecological change. Yet extensive water quality records are limited to few lakes and are cost- and labor-intensive. In contrast, remotely sensed data such as the dominant wavelength, a measure of lake color, is an accessible water quality metric with high spatial and temporal coverage. We tracked changes in remotely sensed lake color across the understudied and data-poor Nebraska Sandhills, a turbid and eutrophic lake district, over three decades. We found that remotely sensed lake color exhibited strong seasonal variability and that changes in dominant wavelength related to climatic and groundwater controls in the Nebraska Sandhills although this relation weakened at local spatial scales. Surprisingly, long-term trends in remotely sensed lake color were rare, suggesting that intra-annual variation in lake color was more pronounced than inter-annual variation in Sandhill lakes. Our study suggests that the dominant wavelength (1) is a viable indicator of ecological change in lakes, (2) is capable of detecting seasonal variation in water quality even in turbid and eutrophic lakes, and (3) provides an opportunity to study mechanisms and rates of ecological change in lakes at multiple spatiotemporal scales and in understudied, data-poor regions.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"71 8","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148768337","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

Contrasting temporal drivers of methane flux across land uses in freshwater wetlands 对比淡水湿地不同土地利用方式甲烷通量的时间驱动因素

IF 3.5 1区地球科学

Limnology and Oceanography Pub Date : 2026-08-18 DOI: 10.1002/lno.70482

Graham A. Stewart, Michael R. Williams, Gregory W. McCarty, Margaret A. Palmer

{"title":"Contrasting temporal drivers of methane flux across land uses in freshwater wetlands","authors":"Graham A. Stewart, Michael R. Williams, Gregory W. McCarty, Margaret A. Palmer","doi":"10.1002/lno.70482","DOIUrl":"10.1002/lno.70482","url":null,"abstract":"Wetlands are collectively the largest natural source of methane (CH4), which complicates the climate mitigation potential of wetland restoration. Land-use change alters wetland soils, vegetation, and hydrology, but the impact of this disturbance legacy on CH4 fluxes from restored wetlands is uncertain. To better understand CH4 dynamics across a gradient of human disturbance, we examined 5 yr of continuous CH4 flux data from a drained, restored, and least-disturbed (“natural”) freshwater mineral-soil wetland. We quantified temporal relationships between CH4 flux and three key biophysical drivers: soil temperature, gross primary productivity, and hydrology. Using information theoretic and nonlinear state-space reconstruction approaches, we assessed how these relationships varied across different time scales and evaluated evidence for causality. All sites had highest diel CH4 fluxes at night, primarily driven by gross primary productivity in the natural wetland and soil temperature in the restored and drained wetland. The seasonal scale accounted for most variability in CH4 fluxes at the natural and restored wetland, with fluxes influenced by the hysteretic causal effects of soil temperature and water level. The effects of seasonal drivers were less evident at the drained site, where fluxes varied more on shorter timescales. Overall, CH4 fluxes in the natural and restored wetland were comparable in magnitude, had similar temporal patterns, and responded similarly to drivers, indicating convergence in underlying processes. Our work furthers understanding of how land-use history modulates wetland ecosystem processes, which is essential for accurate climate projections and effective management amid global change.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"71 8","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.70482","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148754528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Synergistic effects of warming and organic matter enrichment on coastal phosphorus dynamics at high-nitrogen concentrations 增温和有机质富集对高氮浓度下沿海磷动态的协同效应

IF 3.5 1区地球科学

Limnology and Oceanography Pub Date : 2026-08-17 DOI: 10.1002/lno.70481

Shuonan Ma, Ying Zeng, Haijun Wang, Jilin Xu, Cheng Luo, Chunpu Zhao, Zhanfeng Liang, Miao Liu, Erik Jeppesen

{"title":"Synergistic effects of warming and organic matter enrichment on coastal phosphorus dynamics at high-nitrogen concentrations","authors":"Shuonan Ma, Ying Zeng, Haijun Wang, Jilin Xu, Cheng Luo, Chunpu Zhao, Zhanfeng Liang, Miao Liu, Erik Jeppesen","doi":"10.1002/lno.70481","DOIUrl":"10.1002/lno.70481","url":null,"abstract":"Warming and enhanced nutrient and organic matter (OM) pollution are pervasive drivers of global environmental change that may significantly influence the dynamics of coastal sediment phosphorus (P). Traditional studies have predominantly focused on individual environmental stressors. However, the superposition of multiple stressors can trigger additive or synergistic effects, thereby inducing a cascading response of P dynamics and potentially exacerbating the risk of ecosystem collapse. To elucidate the individual and combined impacts of multiple stressors on sediment P dynamics, we performed a 2-month mesocosm experiment with factorial combinations of three temperature gradients and two sediment types differing in OM content under high nitrogen loading conditions. We found that: (i) warming and OM, each taken individually, increased sediment P release by 39–207% and 45%, respectively, whereas their combined effect collectively amplified P release to 179–440%; (ii) the interactive impacts of these two co-occurring stressors on sediment P release were synergistic; (iii) these factors, along with their synergistic interactions, had a cascading net facilitation effect on P release; involving increased populations of phosphate-solubilizing bacteria, up-regulation of functional genes (phoD), enhanced alkaline phosphatase activity, and decreased dissolved oxygen concentration. Combined, these factors, as suggested by piecewise structural equation modeling, explain up to 97% of the observed P release. Our findings provide novel insights into the interactive impacts of co-occurring anthropogenic stressors on coastal P dynamics, highlighting the necessity of considering the synergistic effects of warming and OM pollution on P release in future conservation planning and coastal zone management.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"71 8","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148729053","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

Warming effects on marine microzooplankton and mixoplankton: Physiological responses, community reorganization, and implications for a warming ocean 变暖对海洋微型浮游动物和混合浮游动物的影响：生理反应、群落重组和海洋变暖的影响

IF 3.5 1区地球科学

Limnology and Oceanography Pub Date : 2026-08-14 DOI: 10.1002/lno.70480

Albert Calbet

{"title":"Warming effects on marine microzooplankton and mixoplankton: Physiological responses, community reorganization, and implications for a warming ocean","authors":"Albert Calbet","doi":"10.1002/lno.70480","DOIUrl":"10.1002/lno.70480","url":null,"abstract":"Microzooplankton and mixoplankton are key regulators of marine food webs, yet their responses to ocean warming and thermal extremes remain incompletely integrated across physiological, community, and ecosystem scales. This synthesis examines how temperature shapes the physiology, trophic strategies, and community dynamics of these protistan functional groups using experimental, observational, and modeling evidence from marine systems and relevant contrasts from freshwater and saline inland waters. Short-term experiments with heterotrophic microzooplankton show strong temperature dependence of growth and grazing, but increased respiratory demand can reduce gross growth efficiency, accelerating nutrient recycling without necessarily increasing biomass transfer to higher trophic levels. Mixoplankton deviate from strict heterotrophic expectations because warming can alter the balance between phototrophy and phagotrophy, rather than uniformly accelerating all rates. At the community level, warming can tighten grazer–prey coupling in productive systems, whereas warm, stratified, nutrient-poor systems more often favor communities dominated by smaller prey, trophic flexibility, and recycling-dominated pathways. Thermal variability, including marine heatwaves, introduces additional nonlinearities, temporal mismatches, and legacy effects that remain poorly represented in ecosystem models.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"71 8","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.70480","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148729052","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Connecting models, networks, and experiments: Revisiting the role of viruses in marine carbon cycling 连接模型、网络和实验：重新审视病毒在海洋碳循环中的作用

IF 3.5 1区地球科学

Limnology and Oceanography Pub Date : 2026-08-07 DOI: 10.1002/lno.70472

Maxine Pruvôt, Bart Haegeman, Fabien Joux, David Demory

{"title":"Connecting models, networks, and experiments: Revisiting the role of viruses in marine carbon cycling","authors":"Maxine Pruvôt, Bart Haegeman, Fabien Joux, David Demory","doi":"10.1002/lno.70472","DOIUrl":"10.1002/lno.70472","url":null,"abstract":"The marine microbial food web is a key driver of global carbon cycling, mediating the production, consumption, and remineralization of organic matter in the ocean. Within this food web, viruses exert strong top-down control by infecting and lysing both phytoplankton and heterotrophic bacteria. Although virus-induced mortality is recognized as a factor shaping microbial dynamics, accurately quantifying its contribution to carbon cycling remains difficult. A range of approaches have been used to estimate this contribution, notably: (1) dynamical microbial ecosystem models, (2) static carbon flux network models, and (3) direct measurements of virus-induced mortality, such as dilution assays. In this study, we bring these approaches together within a common mathematical framework. This enables us to clarify the difference between two notions of lysis percentage in the literature, to compare predictions of previous dynamical system and flux network models, and to critically evaluate the theoretical approach of eliminating viruses from the system to explore their effects. Our analysis clarifies how the different approaches capture complementary aspects of the role of marine viruses in carbon cycling across varying spatial and temporal scales.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"71 8","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.70472","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148687866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Zooplankton size structure reflects the trophic status of ponds along a latitudinal gradient 浮游动物的大小结构反映了池塘沿纬度梯度的营养状况

IF 3.5 1区地球科学

Limnology and Oceanography Pub Date : 2026-08-05 DOI: 10.1002/lno.70466

Katterine Rincón-Palau, Anna Badosa, Dani Boix, Maria Cuenca-Cambronero, Carmela Carballo, Thomas A. Davidson, Victoria Frutos-Aragón, Robby Wijns, Pieter Lemmens, Luis Martín, Mariana Meerhoff, Thomas Mehner, Sandra Brucet

{"title":"Zooplankton size structure reflects the trophic status of ponds along a latitudinal gradient","authors":"Katterine Rincón-Palau, Anna Badosa, Dani Boix, Maria Cuenca-Cambronero, Carmela Carballo, Thomas A. Davidson, Victoria Frutos-Aragón, Robby Wijns, Pieter Lemmens, Luis Martín, Mariana Meerhoff, Thomas Mehner, Sandra Brucet","doi":"10.1002/lno.70466","DOIUrl":"10.1002/lno.70466","url":null,"abstract":"Despite increasing research on warming and biodiversity, knowledge on how temperature shapes community size structure remains limited, which is one of the main challenges in assessing the consequences of climate change. This gap is evident in vulnerable ecosystems like ponds, crucial for aquatic biodiversity but highly sensitive to temperature increases due to their small size. This study assessed the main climatic and local drivers influencing zooplankton community size structure in 141 ponds across four European countries and Uruguay, covering a wide latitudinal and trophic gradient with standardized sampling. Using linear mixed models, results revealed that local factors, such as trophic status and morphometric pond characteristics, were more consistently associated with size-spectrum parameters than climatic variables. The normalized size spectrum slopes (ordinary least square regression, OLS) became steeper with higher chlorophyll a (Chl a) concentrations, reflecting dominance of small zooplankton, suggesting reduced energy transfer efficiency to higher trophic levels, and possibly weaker top-down phytoplankton control. Conversely, ponds with lower Chl a showed flatter slopes, indicating more large zooplankton and possibly greater top-down control. The overall intercept was higher in deeper ponds with abundant aquatic vegetation, suggesting greater overall abundance across size classes. Size spectrum metrics did not vary significantly along climatic gradients. These results suggest that zooplankton community size structure in ponds appears to be more closely related to local environmental conditions than large-scale climatic gradients. This highlights the key role of local habitat characteristics in shaping zooplankton size structure and energy transfer dynamics.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"71 8","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148675040","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

Biogeochemical responses to a tropical storm in an eroding estuary of the Mississippi river delta plain 密西西比河三角洲平原侵蚀河口对热带风暴的生物地球化学响应

IF 3.5 1区地球科学

Limnology and Oceanography Pub Date : 2026-08-03 DOI: 10.1002/lno.70473

Mukseet Mahmood, Kanchan Maiti, Yixuan Wang, George Xue

{"title":"Biogeochemical responses to a tropical storm in an eroding estuary of the Mississippi river delta plain","authors":"Mukseet Mahmood, Kanchan Maiti, Yixuan Wang, George Xue","doi":"10.1002/lno.70473","DOIUrl":"10.1002/lno.70473","url":null,"abstract":"The impact of abrupt hydrological changes due to extreme weather events on estuarine carbon cycling and transport remains poorly understood. This study investigates the changes in sources and transport of dissolved (DOC) and particulate organic carbon (POC) along the land-estuary-ocean continuum of the Barataria Basin estuary system, located south of Louisiana after hurricane Francine. Pre- and post-storm samplings were carried out for POC, DOC, dissolved inorganic carbon (DIC) and colored dissolved organic matter (CDOM) to assess the impact of storm on estuarine carbon dynamics. DOC ranged from 2.2 to 13.3 and 4.6 to 12.0 mg/L while POC ranged from 1.5 to 4.6 and 3.4 to 7.1 mg/L during pre- and post-storm periods, respectively. Lower humification index (HIX) and aCDOM350 suggest a transition from older, more degraded DOM to fresher, newer, more labile DOM after storm. Primary production and respiration rates both increased in the bay after the storm. The change in δ13C of sediment organic carbon showed increased terrestrial organic matter input and 7Be approach indicated recent sediment deposition in the basin. COAWST, a computer simulation model was implemented to compute the change in discharge rates due to storm which coupled with DOC and POC analysis indicate that 60.7 and 76.4 tons of additional POC and DOC were exported from this relatively small estuary within 5 d after landfall of hurricane Francine. This study highlights the impact of storms on carbon transport in eroding deltaic estuaries, emphasizing the need to incorporate storm-driven carbon fluxes into regional and global carbon budgets.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"71 8","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148675043","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

Shifts in subsurface oxygen transport and consumption patterns in a restored coastal flood plain over five years 恢复后的沿海洪泛平原5年来地下氧运输和消耗模式的变化

IF 3.5 1区地球科学

Limnology and Oceanography Pub Date : 2026-08-03 DOI: 10.1002/lno.70477

Emilio Grande, Ruby N. Ghosh, McCIntire, Mike J. Freeman, Peter Regier, Nicholas D. Ward

{"title":"Shifts in subsurface oxygen transport and consumption patterns in a restored coastal flood plain over five years","authors":"Emilio Grande, Ruby N. Ghosh,  McCIntire, Mike J. Freeman, Peter Regier, Nicholas D. Ward","doi":"10.1002/lno.70477","DOIUrl":"https://doi.org/10.1002/lno.70477","url":null,"abstract":"Groundwater dissolved oxygen (DO) variability in coastal systems remains poorly understood despite its importance for biogeochemical cycling and ecosystem modeling. This study investigates temporal variability in groundwater DO and its hydro-climatic drivers across timescales (hourly to seasonal) in a coastal floodplain at Beaver Creek, Washington, USA, a site transitioning from a freshwater forest to brackish tidal wetland following restoration of tidal influence. Using 5 years of high-frequency (5-min) hydro-meteorological and continuous groundwater DO data, we applied wavelet and information theory analyses to disentangle the role of different drivers (e.g., groundwater levels, temperature, precipitation, among others) on DO dynamics. Monitoring was initiated 5 years after the site was restored but prior to subsurface conditions reaching a new steady state. We found that DO pulses related to tidal flooding events were most frequent during earlier water years, dominated by hourly, daily and multiday variability. In later years both the frequency and magnitude of these DO pulses decreased, resulting in more prolonged subsurface anoxia. These shifts in DO patterns reflect gradually changing subsurface biogeochemical conditions as the system continues to fully transition from lowland forest to brackish wetland 10 years after restoration. This study highlights the critical role of timescale-specific analyses in understanding wetland biogeochemistry by identifying dominant drivers of DO variability and linking them to ecosystem transitions. Our scale-aware approach offers a framework for evaluating ecosystem responses to climate change, sea-level rise, and restoration efforts in tidal wetlands.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"71 8","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.70477","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752602","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Phosphate modulates elemental and macromolecular composition of unicellular nitrogen-fixing cyanobacteria 磷酸盐调节单细胞固氮蓝藻的元素和大分子组成

IF 3.5 1区地球科学

Limnology and Oceanography Pub Date : 2026-08-03 DOI: 10.1002/lno.70475

Sing-how Tuo, Ying-Yu Hu, Andrew J. Irwin, Michael J. Follows, Zoe V. Finkel

{"title":"Phosphate modulates elemental and macromolecular composition of unicellular nitrogen-fixing cyanobacteria","authors":"Sing-how Tuo, Ying-Yu Hu, Andrew J. Irwin, Michael J. Follows, Zoe V. Finkel","doi":"10.1002/lno.70475","DOIUrl":"10.1002/lno.70475","url":null,"abstract":"The C : N : P of nitrogen-fixing cyanobacteria regulates phosphate-limited nitrogen fixation in the ocean yet the causes and range in variation C : N : P is not well constrained. Here we quantify the C : N : P and underlying macromolecular composition of Crocosphaera. Crocosphaera is a nitrogen-fixing cyanobacterium that substantively contributes to elemental biogeochemistry in the (sub)tropical oceans. We observed variation in C : N : P and macromolecular composition over the photoperiod, across two different sized phenotypes and with phosphate concentration. In both phenotypes, C : N is ~ 1.3-fold higher in the day than the night due to increasing carbohydrate in the smaller phenotype and increasing lipid in the larger phenotype during the day and increasing protein in both phenotypes at night. Detectable levels of surface adsorbed phosphorus were only observed at night. The two sized phenotypes differed in macromolecular allocation: the smaller phenotype had a higher proportion of carbon to DNA, RNA, and chlorophyll a while the larger phenotype was higher in lipids relative to carbohydrates. The largest variation in C : N : P arose with changes in phosphate concentration. Decreasing phosphate in the media from 50 to 0.5 μM induced a 27-fold decrease in cellular P, increasing molar N : P from ~ 2 to between 41 and 64 and C : P from ~ 15 to between 335 and 484 across the phenotypes. Much of these changes can be attributed to changes in polyphosphate content and secondarily DNA content. The accumulation and storage of polyphosphate under higher phosphate concentrations could temporarily increase Crocosphaera's capacity to fix nitrogen when phosphate is scarce.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"71 8","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.70475","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148675045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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