Limnology and Oceanography最新文献

Primary production drives varied zooplankton migration strength and twilight‐zone particle dynamics across ecological gradients in the western North Pacific 初级生产驱动了北太平洋西部不同生态梯度的浮游动物迁移强度和暮光带颗粒动力学

IF 4.5 1区地球科学

Limnology and Oceanography Pub Date : 2025-04-29 DOI: 10.1002/lno.70074

Zengchao Xu, Zeqi Zheng, Chao Xu, Feipeng Xu, Jixin Chen, Xin Liu, Michael R. Landry, Bangqin Huang

{"title":"Primary production drives varied zooplankton migration strength and twilight‐zone particle dynamics across ecological gradients in the western North Pacific","authors":"Zengchao Xu, Zeqi Zheng, Chao Xu, Feipeng Xu, Jixin Chen, Xin Liu, Michael R. Landry, Bangqin Huang","doi":"10.1002/lno.70074","DOIUrl":"https://doi.org/10.1002/lno.70074","url":null,"abstract":"Diel vertical migrations (DVM) of zooplankton play a crucial role in transferring organic matter efficiently to the deep ocean. However, the spatial regulatory determinants of DVM strength, including migrant biomass and migration amplitude, remain understudied. We conducted 34 stratified trawls and 85 Underwater Vision Profiler 5 casts across latitudes 12.5°N to 41.5°N in the western North Pacific and developed a structural equation model to explain DVM variability relative to measured and remotely sensed environmental data. Migrant biomass was mainly determined by net primary productivity (NPP), being two orders of magnitude greater in high NPP waters due to higher zooplankton biomass and larger migrating individuals. Migration amplitude was also larger at high NPP stations but was determined by a direct negative correlation to euphotic zone depth and an offsetting indirect positive interaction with water clarity. Migration patterns reflect the classic tradeoff between predation risk and reduced daytime feeding for regular DVM and likely avoidance of mesopelagic visual predators at night for reverse migrants. In high‐resolution profiles, particle abundances and large particle contributions increased in the twilight zone during the daytime, generally aligning with biomass distributions and respiratory fluxes of migratory zooplankton. Migrants likely contribute to mesopelagic particle dynamics with pulsed fecal matter delivery from the euphotic zone and direct interactions with deep particle fields. Mesopelagic particle dynamics might also be linked to deep migrant mortality, the least quantified component of the biological carbon pump.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"25 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143890083","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

Phago‐mixotrophic activity within nanophytoplankton community in a subtropical marginal sea 亚热带边缘海纳米浮游植物群落的吞噬-混合营养活动

IF 4.5 1区地球科学

Limnology and Oceanography Pub Date : 2025-04-29 DOI: 10.1002/lno.70077

Wupeng Xiao, Jiayu Guo, Lingqi Ma, Lina An, Zhuyin Tong, Mingwang Xiang, Qian Li, Edward A. Laws, Jixin Chen, Bangqin Huang

{"title":"Phago‐mixotrophic activity within nanophytoplankton community in a subtropical marginal sea","authors":"Wupeng Xiao, Jiayu Guo, Lingqi Ma, Lina An, Zhuyin Tong, Mingwang Xiang, Qian Li, Edward A. Laws, Jixin Chen, Bangqin Huang","doi":"10.1002/lno.70077","DOIUrl":"https://doi.org/10.1002/lno.70077","url":null,"abstract":"An increasing number of studies have documented the ecological importance of phago‐mixotrophy within phytoplankton communities, especially in open ocean environments. We know less about the distribution and function of such phytoplankton within marginal seas. This study was an investigation of phago‐mixotrophy among nanoeukaryotic phytoplankton along a shelf‐to‐off‐shelf transect in the South China Sea with a focus on prasinophytes (Mamiellophyceae) and haptophytes (Prymnesiophyceae). We measured group‐specific grazing rates using tyramide signal amplified fluorescent in situ hybridization and assessed community‐level inorganic nutrient (including carbon and nitrogen) uptake rates to demonstrate the heterotrophic and autotrophic growth capabilities of the phytoplankton. We also used correlation analysis, principal component analysis, generalized additive models, and structural equation modeling to evaluate the interrelationship between phago‐mixotrophic activity and key environmental parameters, including abiotic factors (e.g., temperature, salinity, nutrients) and biotic factors (e.g., bacterial abundance). Our results revealed that phago‐mixotrophic Mamiellophyceae were more abundant at lower salinities and higher temperatures. Grazing rates were positively correlated with the abundance of ambient bacteria. Grazing rates of Prymnesiophyceae on bacteria were highest at stations where nutrient concentrations were low and light intensity was high and were found to be positively correlated with phytoplankton nitrate uptake rates. These findings highlighted the dynamic interplay between autotrophic and heterotrophic nutrition of phago‐mixotrophic phytoplankton and demonstrated how environmental conditions regulate their ability to balance photosynthesis and predation on bacteria. The results provided valuable insights into the ecological roles of phago‐mixotrophy and its contributions to biogeochemical cycling in an under‐investigated subtropical marginal sea.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"35 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143890082","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

Impact of copper and iron on growth and silicic acid uptake in two Southern Ocean diatoms 铜和铁对两种南大洋硅藻生长和硅酸吸收的影响

IF 4.5 1区地球科学

Limnology and Oceanography Pub Date : 2025-04-28 DOI: 10.1002/lno.70071

Prayna P. P. Maharaj, Michael J. Ellwood

{"title":"Impact of copper and iron on growth and silicic acid uptake in two Southern Ocean diatoms","authors":"Prayna P. P. Maharaj, Michael J. Ellwood","doi":"10.1002/lno.70071","DOIUrl":"https://doi.org/10.1002/lno.70071","url":null,"abstract":"Copper (Cu) and iron (Fe) are vital micronutrients that influence diatom physiology, growth rate, and nutrient stoichiometry. This study examines the interactive effects of Cu and Fe on two Southern Ocean diatoms, Proboscia inermis and Chaetoceros flexuosus, cultured under varying Fe and Cu conditions. Results show that Cu and Fe interactions lead to an overall decline in growth rates with decreasing Fe and Cu concentrations. Cu deficiency inhibits growth rate, suggesting a constitutive role of Cu in biochemical pathways, especially under Fe‐limiting conditions. Changes in Fe and Cu also influenced cell volume (CV) and surface area (SA), with P. inermis showing an increased CV and SA under Fe stress. For C. flexuosus, changes in CV and SA were more variable. Changes in Fe and Cu bioavailability significantly affected silicic acid (Si(OH)4) uptake, as reflected in the maximum Si(OH)4 uptake rate and the half‐saturation constant for Si(OH)4 uptake. Both diatoms also displayed a wide range of Si isotope fractionation values, ranging from −0.38‰ ± 0.03‰ to −1.43‰ ± 0.11‰ in P. inermis and −1.33‰ ± 0.10‰ to −2.18‰ ± 0.05‰ in C. flexuosus under changing Fe and Cu concentrations. Our findings confirm that Cu and Fe interactions significantly affect morphological and physiological parameters in diatoms, particularly Si(OH)4 affinity and Si isotope fractionation. This work highlights the need for further investigation into these synergistic effects, as they can influence diatom production, which may, in turn, impact community composition dynamics in the Southern Ocean.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143880401","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 functional responses of benthic and hyporheic stream biofilms to light availability and macronutrient stoichiometry 底栖生物和潜流生物膜对光有效性和宏量营养素化学计量的功能响应对比

IF 4.5 1区地球科学

Limnology and Oceanography Pub Date : 2025-04-26 DOI: 10.1002/lno.70069

Anika Große, Daniel Graeber, Patrick Fink, Alexander J. Reisinger, Norbert Kamjunke, Michele Meyer, Maja Ilić, Dietrich Borchardt, Nuria Perujo

{"title":"Contrasting functional responses of benthic and hyporheic stream biofilms to light availability and macronutrient stoichiometry","authors":"Anika Große, Daniel Graeber, Patrick Fink, Alexander J. Reisinger, Norbert Kamjunke, Michele Meyer, Maja Ilić, Dietrich Borchardt, Nuria Perujo","doi":"10.1002/lno.70069","DOIUrl":"https://doi.org/10.1002/lno.70069","url":null,"abstract":"Nutrient dynamics in headwater streams are governed by benthic and hyporheic biofilms, with carbon (C) : nitrogen (N) : phosphorus (P) ratios driving the heterotrophic microbial biofilm development through nutrient limitation. Furthermore, heterotrophic responses to changes in C : N : P ratios are probably modulated by autotrophic responses to light and C : N : P ratios, which modify the amount and composition of photosynthetic exudates and increase competition for nutrients. Effects on functional properties like the use of organic compounds by the heterotrophic biofilm community are largely unknown. We conducted a stream mesocosm experiment with a factorial design with different C : N : P ratios and light availability levels to test direct and indirect effects on heterotrophic biofilm functioning via community‐level physiological profiles in benthic and hyporheic biofilms. When inducing a resource C : N : P ratio closer to heterotrophic microbial biomass C : N : P ratios, we found an increased functional diversity of metabolized substrates, especially in hyporheic biofilms. Furthermore, this alteration shaped substrate preferences toward less P‐containing substrates and more N‐containing substrates in early‐stage biofilms. Despite the absence of a direct impact of light on hyporheic biofilms, we detected a propagation of a benthic autotrophic effect into hyporheic biofilms. Light availability induced effects on hyporheic bacterial density and the use of phenolic compounds, amino acids, and carbohydrates. In benthic biofilms, only the use of carbohydrates was affected by light. These results emphasize the significant indirect effects of benthic autotrophs on the functionality of hyporheic microbial heterotrophs and suggest consequences of human impacts, such as nutrient inputs and clear‐cutting, on stream nutrient cycling.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"44 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2025-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143876143","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 “A 7‐yr spatial time series resolves the island mass effect and associated shifts in picocyanobacteria abundances near O'ahu, Hawai'i” 更正“一个7年的空间时间序列解决了夏威夷奥胡岛附近的岛质量效应和picocyanobacteria丰度的相关变化”

IF 4.5 1区地球科学

Limnology and Oceanography Pub Date : 2025-04-26 DOI: 10.1002/lno.12737

引用次数: 0

Correction to “Aluminum increases net carbon fixation by marine diatoms and decreases their decomposition: Evidence for the iron–aluminum hypothesis” 对“铝增加海洋硅藻的净固碳量并减少其分解：铁铝假说的证据”的更正

IF 4.5 1区地球科学

Limnology and Oceanography Pub Date : 2025-04-26 DOI: 10.1002/lno.12377

引用次数: 0

Mass deposition of microbes from wildfire smoke to the sea surface microlayer 野火烟雾中的微生物大量沉积到海面微层

IF 4.5 1区地球科学

Limnology and Oceanography Pub Date : 2025-04-26 DOI: 10.1002/lno.70078

Siyao Yue, Yafang Cheng, Lishan Zheng, Senchao Lai, Shan Wang, Tianli Song, Linjie Li, Ping Li, Jialei Zhu, Meng Li, Lianfang Wei, Chaoqun Ma, Rui Jin, Yingyi Zhang, Yele Sun, Zifa Wang, Kimitaka Kawamura, Cong‐Qiang Liu, Hang Su, Meinrat O. Andreae, Pingqing Fu

引用次数: 0

Issue Information & Masthead 发行信息和报头

IF 3.8 1区地球科学

Limnology and Oceanography Pub Date : 2025-04-25 DOI: 10.1002/lno.70066

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Issue Information & Members form 发行信息和会员表格

IF 3.8 1区地球科学

Limnology and Oceanography Pub Date : 2025-04-25 DOI: 10.1002/lno.70068

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Issue Information & Copyright 发行信息及版权

IF 3.8 1区地球科学

Limnology and Oceanography Pub Date : 2025-04-25 DOI: 10.1002/lno.70065

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