Limnology and Oceanography最新文献

{"title":"Understanding stoichiometric adjustments in a freshwater plant: Responses to sediment and water nutrient dynamics across lake trophic gradients","authors":"Michał Rybak, Jakub Szymkowiak, Magdalena Woźniak, Tomasz Joniak, Piotr Klimaszyk, Łukasz Wejnerowski, Izabela Ratajczak, Mandy Velthuis","doi":"10.1002/lno.70104","DOIUrl":"https://doi.org/10.1002/lno.70104","url":null,"abstract":"Despite ongoing efforts to reduce nutrient inputs, eutrophication continues to disrupt biogeochemical cycles and destabilize freshwater food webs. In this study, we examine the stoichiometric responses of the freshwater plant <jats:italic>Myriophyllum spicatum</jats:italic> under varied environmental conditions across lakes of differing trophic status. Specimens were collected from lakes with a wide natural range of macro‐ (C, N, P) and micronutrient (Fe, Cu, Zn) concentration in both water and sediments. We applied the ecological stoichiometry framework and analyzed the relationship between nutrient availability (water and sediments) and the elemental composition of <jats:italic>M. spicatum</jats:italic>'s organs (leaves, stems, and roots). The C : N : P ratios in organs were not affected by eutrophication. Instead, all macro‐ and micronutrient concentrations differed between plant organs. N concentration was highest in leaves and roots, indicating uptake from both sources. Furthermore, sediments significantly influenced the plant organs' C, P, and Zn concentration, while nutrients in the water column showed no correlation. Leaves demonstrated flexibility in C and Zn concentrations, negatively correlating with sediment levels of these elements. The concentration of micronutrients was highest in the roots. Our results indicate distinct nutrient allocation strategies for different plant organs: leaves are rich in N to support photosynthesis, stems store C and P, aiding growth and reproduction, and roots accumulate micronutrients Fe, Zn, and Cu. It highlights sediments as a critical nutrient source for <jats:italic>M. spicatum</jats:italic>, shaping its elemental composition. The relationship between organisms' biochemistry, trophic interactions, and their transformation into dead organic matter is crucial for understanding environmental stress impacts on aquatic ecosystems.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"39 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144236969","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}

{"title":"Issue Information & Copyright","authors":"","doi":"10.1002/lno.70091","DOIUrl":"https://doi.org/10.1002/lno.70091","url":null,"abstract":"","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 5","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.70091","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144206433","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}

{"title":"Issue Information & Masthead","authors":"","doi":"10.1002/lno.70090","DOIUrl":"https://doi.org/10.1002/lno.70090","url":null,"abstract":"","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 5","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.70090","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144206432","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}

{"title":"Issue Information & Members form","authors":"","doi":"10.1002/lno.70092","DOIUrl":"https://doi.org/10.1002/lno.70092","url":null,"abstract":"","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 5","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.70092","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144206435","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}

{"title":"Issue Information & TOC","authors":"","doi":"10.1002/lno.70093","DOIUrl":"https://doi.org/10.1002/lno.70093","url":null,"abstract":"","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 5","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.70093","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144206434","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}

{"title":"Tradeoffs between elemental homeostasis and growth govern freshwater phytoplankton responses to salinization","authors":"Samuel A. T. Dias, Clay Prater, Adriana Diaz‐Delgado, Natalie A. Clay, Sally A. Entrekin, Michelle A. Evans‐White","doi":"10.1002/lno.70099","DOIUrl":"https://doi.org/10.1002/lno.70099","url":null,"abstract":"Anthropogenic salinization resulting from road salt application can degrade aquatic environments by altering the structure and function of phytoplankton communities, ultimately reducing flows of resources through aquatic food webs. However, physiological mechanisms underlying taxon‐specific responses to salinization are often poorly linked to higher‐order ecosystem dynamics, limiting our ability to predict community responses to salinization. To this end, we tested hypotheses derived from Subsidy‐Stress and Ecological Stoichiometry theory by growing two cosmopolitan genera, <jats:italic>Dolichospermum</jats:italic> (prokaryotic, cyanobacteria) and <jats:italic>Scenedesmus</jats:italic> (eukaryotic, green algae), across NaCl gradients and contrasting differences in their growth rates, degree of Na homeostasis, and cellular C : N : P ratios. We found mixed support for the subsidy‐stress hypothesis, with only stress responses observed for both species. Instead, growth declines appeared to be linked to stoichiometric tradeoffs between growth and homeostatic regulation, with stronger homeostatic Na regulation coinciding with a greater reduction in <jats:italic>Scenedesmus</jats:italic> growth rates and higher variation in their stoichiometric C : N : P ratios across NaCl gradients. Nonhomeostatic Na regulation allowed <jats:italic>Dolichospermum</jats:italic> to sustain higher growth rates, which appeared to constrain variation in their stoichiometric C : N : P ratios along with their stronger physiological regulation of intracellular P storage molecule production. Differences in phytoplankton growth responses were consistent with stoichiometric theory and field observations documenting shifts from green algae to cyanobacteria in response to freshwater salinization. Our results suggest that these shifts could take place below existing North American chronic threshold limits, resulting in decreased production at higher trophic levels by reducing phytoplankton biomass production rates and inducing nutritional stress in consumers.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"45 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144192863","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}

{"title":"Smaller phytoplankton size‐groups control the stoichiometry of the autotrophic community","authors":"Thomas Mollica, Hanna Farnelid, Elin Lindehoff, Catherine Legrand","doi":"10.1002/lno.70058","DOIUrl":"https://doi.org/10.1002/lno.70058","url":null,"abstract":"In the marine environment, the prevailing paradigm is that larger organisms like diatoms are primary contributors to phytoplankton stoichiometry. Numerous studies investigated the stoichiometry of phytoplankton groups or total community but its dynamics among different size‐groups are not resolved. In exploring the influence of phytoplankton community composition and succession on seasonal stoichiometry in the Baltic Sea, our study reveals that smaller size‐groups, such as nanoplankton and picoplankton, play a more significant role than traditionally thought. During seasonal transitions in nutrient availability—from nutrient‐rich spring conditions favoring diatoms and dinoflagellates to nitrogen‐limited summer conditions favorable for cyanobacteria—the Baltic Proper exhibits marked shifts in community structure and offers a unique system to investigate stoichiometric dynamics. Our yearly sampling at an offshore station using a size‐fraction protocol unveils that the stoichiometry within larger size fractions (&gt; 20 <jats:italic>μ</jats:italic>m) does not reflect the overall community's stoichiometry. Instead, nanoplankton and picoplankton dominate nutrient cycling processes despite their smaller size. On any occasion, they represent between 55% and 90% of the biomass making them critical for nitrogen and phosphorus uptake and photosynthetic carbon fixation. These findings challenge the plankton stoichiometry paradigm and highlight the necessity to include these smaller phytoplankton groups into future climate change models to improve predictions regarding ecosystem responses to eutrophication and environmental changes.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"2 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144176580","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}

{"title":"The interaction of regional and local drivers shapes summer ecosystem metabolism in lakes across Canada","authors":"Amir Reza Shahabinia, Matthew J. Bogard, Paul A. del Girogio","doi":"10.1002/lno.70095","DOIUrl":"https://doi.org/10.1002/lno.70095","url":null,"abstract":"Assessments of lake gross primary production (GPP) and respiration (R) and their balance (net ecosystem production, NEP) have been limited to specific watersheds and a limited number of lakes, often along narrow environmental gradients. This is because conventional approaches require either lengthy incubations or the deployment of monitoring equipment, none of which are feasible for large‐scale studies. Here we present a macroscale study of lake metabolism and explore the patterns and drivers of GPP, R, and NEP in lakes across Canada as part of the LakePulse network. We measured summertime water column metabolic rates in 742 lakes, using an oxygen isotopic (δ<jats:sup>18</jats:sup>O<jats:sub>2</jats:sub>) approach, which provide an integrative snapshot of mixed‐layer metabolism in stratified lakes, or whole‐lake metabolism in polymictic lakes. The lakes were distributed across the five major Canadian continental drainage basins, covering a wide range of in‐lake, land use, and climatic features. Gross primary production and R varied by four orders of magnitude across lakes and regions, driven by factors such as total phosphorus and nitrogen, dissolved organic carbon, and chlorophyll. Net ecosystem production had a weak but significant positive linear relationship with water column light and a negative relationship with colored dissolved organic matter. Our results reveal systematic differences in regional baseline GPP and R driven by landscape properties such as altitude, and that lake metabolism in some regions may be more sensitive to eutrophication and browning, mediated by regional hydrology, which is itself linked to climate.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"5 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144176623","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}

{"title":"Quantitative assessment of trophic flow based on polyunsaturated fatty acids reveals that high‐quality algae support aquatic food webs irrespective of dams","authors":"Juan Huang, Fen Guo, Martin J. Kainz, Stuart E. Bunn, Xiaoguang Ouyang, Feilong Li, Qingping Du, Yuan Zhang","doi":"10.1002/lno.70100","DOIUrl":"https://doi.org/10.1002/lno.70100","url":null,"abstract":"High‐quality, yet less abundant, food sources sustain river food webs. However, the impacts of dams on these sources and their nutritional contributions to aquatic animals are not well understood. A substantial knowledge gap exists in understanding the quantitative contribution of basal food sources, such as periphyton, to aquatic animal diets and their role in supporting aquatic animals. This study fills this gap by using long‐chain polyunsaturated fatty acids as biomarkers to quantify the dietary contributions of periphyton, submerged leaves, and macrophytes to macroinvertebrates and fish in dammed rivers. Our results showed that periphyton contributed more to the lipid diets of macroinvertebrates and fish than submerged leaves and macrophytes, regardless of dams, and was a high‐quality food source supporting aquatic food webs. The dietary contribution of periphyton to macroinvertebrates decreased at the downstream sites of small dams compared to the upstream sites, while the contribution of leaves and macrophytes increased due to dam‐induced changes in periphyton nutritional quality. The nutritional quality of periphyton correlated positively with its contribution to invertebrate grazers and filterers, while its contribution to fish varied depending on the feeding strategies of fish species. Our findings underscore periphyton as a high‐quality dietary source in dammed river ecosystems and suggest that improving its nutritional quality enhances its contribution to the lipid diets of macroinvertebrates and fish.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"26 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144176624","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}

{"title":"Eutrophication‐induced dinoflagellate succession contributes to marine carbon sequestration through refractory dissolved organic matter accumulation","authors":"Fu‐Tao Fang, Zhuo‐Yi Zhu, Yuan‐Bi Yi, Ding He, Hong‐Yan Bao, En‐Ren Zhang, Cheng‐Xu Zhou","doi":"10.1002/lno.70097","DOIUrl":"https://doi.org/10.1002/lno.70097","url":null,"abstract":"The increasing eutrophication of coastal seas is causing a shift in the most important phytoplankton groups from diatoms to dinoflagellates, but its feedback to marine carbon cycling remains unclear. Here, we investigated the potential of the key coastal phytoplankton, the diatom <jats:italic>Skeletonema costatum</jats:italic>, and the dinoflagellate <jats:italic>Prorocentrum donghaiense</jats:italic>, for refractory dissolved organic carbon (DOC) accumulation over dark degradation incubations of 70 d. Our multi‐method approach showed that dinoflagellate detritus, rather than diatom detritus, significantly contributes to refractory DOC. This is evidenced by the fact that the detritus of dinoflagellates compared to that of diatoms (1) has a weaker transmittance in infrared spectrometry, indicating a lower content of labile organic substances (alcohol and amide groups); (2) has a higher release and/or transformation efficiency of particulate organic carbon to DOC (81% vs. 50%); (3) has a lower content of labile fraction, amino acid (8% vs. 17% carbon) and exhibits lower degradability of the DOC formed (23% vs. 30%); (4) has a lower content of labile compounds determined by Fourier transform ion cyclotron resonance mass spectrometry (maximum molecular lability boundary: 21% vs. 31%); and (5) has a higher proportion of refractory carboxylic‐rich alicyclic molecules (57% ± 0.5% vs. 51% ± 0.7%) over incubations. Our results emphasize that eutrophication‐triggered coastal dinoflagellate succession has a significant potential for positive feedback to carbon sequestration through the formation of refractory DOC.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"83 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144153309","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}