Limnology and Oceanography最新文献

{"title":"Long‐term changes to plankton communities in artificially heated lakes","authors":"Kingsly C. Beng, Slawek Cerbin, Michael T. Monaghan, Justyna Wolinska","doi":"10.1002/lno.70192","DOIUrl":"https://doi.org/10.1002/lno.70192","url":null,"abstract":"Increased surface‐water temperatures and nutrient enrichment are predicted to alter planktonic communities, impacting biodiversity and ecosystem functioning. While short‐term mesocosm studies have reported temperature‐ and nutrient‐driven effects, long‐term observations from natural systems remain limited. We studied seasonal plankton communities in 10 lakes in central Poland, five warmed by power plant discharge for six decades and ~ 2°C warmer (annual mean) than control lakes. Based on environmental DNA (eDNA) relative read abundance, green algae (Chlorophyta) were up to 15% more abundant in heated lakes, while golden algae (Chrysophyceae) were up to 7% more abundant in control lakes. Heated lakes exhibited higher diversity of diatoms, green algae, golden algae, cercozoans, basidiomycetes, and chytrids, especially in summer. Their plankton assemblages were compositionally distinct and showed reduced seasonal variability. Multiple regression revealed that rising temperature, interacting with elevated nutrients, reduced diversity in many plankton groups. Warming favored heat‐adapted taxa, driving compositional shifts. By providing insights into the long‐term impacts of anthropogenic warming, this study underscores the importance of integrating temperature‐nutrient interactions in predicting ecosystem responses to climate change.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"14 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2025-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144919573","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":"Climate change scenarios differentially modulate the impact of invasion in a native macrophyte species","authors":"Tauany Rodrigues, Joseph L. S. Ferro, Reinaldo L. Bozelli, Aliny P. F. Pires, Vinicius F. Farjalla","doi":"10.1002/lno.70179","DOIUrl":"https://doi.org/10.1002/lno.70179","url":null,"abstract":"Biological invasion and climate change threaten freshwater ecosystems, potentially amplifying their impacts through interaction. However, empirical evidence on how future climate scenarios influence the invasion process and their interactive effects on native species remains limited. We conducted a full‐factorial experiment to evaluate the independent and interactive effects of <jats:italic>Hydrilla verticillata</jats:italic> invasion and future climate scenarios (baseline, mitigation, and business‐as‐usual) on the native macrophyte <jats:italic>Cabomba caroliniana</jats:italic>. We also assessed the response of the non‐native <jats:italic>H. verticillata</jats:italic> to these climate scenarios. The climate change mitigation scenario maintained the invasive potential of <jats:italic>H. verticillata</jats:italic>, as indicated by its vertical growth and colonization potential via vegetative propagules, which were comparable to baseline conditions. Simultaneously, the mitigation scenario supported the vertical growth and production of <jats:italic>C. caroliniana</jats:italic> at levels similar to those under the baseline. Under the business‐as‐usual scenario, <jats:italic>H. verticillata</jats:italic> exhibited enhanced vertical growth and colonization capacity via vegetative propagules. Interestingly, its presence under the business‐as‐usual scenario was associated with increased vertical production of the native species. Although invasion appeared to buffer the adverse effects of extreme climatic stress, it merely enabled <jats:italic>C. caroliniana</jats:italic> to recover vertical production to baseline and mitigation levels, rather than providing a long‐term advantage. Our findings highlight the ecological benefits of climate change mitigation and the complex outcomes arising from the interaction between invasion and future climate scenarios for native species.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"42 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2025-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144919575","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":"Dynamic benthic oxygen fluxes lessen hypoxia effects on open continental shelves","authors":"Clare E. Reimers, Sarah K. Henkel, Kristen E. Fogaren, Peter J. Chace, Anna Hughes, W. Waldo Wakefield","doi":"10.1002/lno.70197","DOIUrl":"https://doi.org/10.1002/lno.70197","url":null,"abstract":"Under the supposition that organisms inhabiting physically dynamic marine environments are better able to survive hypoxic conditions than those experiencing little turbulent or advective augmentation of oxygen fluxes, we evaluated summertime benthic macrofauna communities, in situ aquatic eddy covariance measurements, and ex situ sediment core incubations from 5 latitudinally distinct mid‐shelf locations off Oregon–Washington, USA. Despite bottom water dissolved oxygen (DO) concentrations averaging from 17 to 75 <jats:italic>μ</jats:italic>mol L<jats:sup>−1</jats:sup>, invertebrate faunal collections contained mixtures of 11 to 28 taxa per 0.1 m<jats:sup>2</jats:sup> box core and increased in richness and abundance at sites with greater velocity variation. Eddy covariance velocity records of 18‐30 hours regularly showed the arrivals of internal waves. Oxygen fluxes, derived in 15‐min intervals, correlated with multiple flow parameters assessed from velocity components. Daily averages of the oxygen fluxes to the sediment were determined to range from −3.5 to −23 mmol m<jats:sup>−2</jats:sup> d<jats:sup>−1</jats:sup>, and these fluxes, assumed to fully represent seabed respiration, were 2 to 5 times greater than rates of DO uptake by sediment cores from the same locations. Velocity profiles measured from 0.3 to 2.5 m above the seafloor at a subset of sites were consistent with a wave‐current boundary layer modulated by ocean swell. These findings illustrate how natural physical processes can relieve the stress of hypoxia exposure on the benthos. Physical dynamics play critical roles in supplying DO and determining sediment grain size, permeability, and the activities of benthic organisms. Thus, these factors need consideration when predicting the impacts of low DO concentrations in coastal regions.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"306 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144919574","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":"Effects of oligotrophication on fish growth: Insights from a mesocosm experiment","authors":"Juliana Deo Dias, Nadson Ressye Simões, Claudia Costa Bonecker, Angelo Antonio Agostinho","doi":"10.1002/lno.70198","DOIUrl":"https://doi.org/10.1002/lno.70198","url":null,"abstract":"Human activities can frequently affect aquatic ecosystems in irreversible ways, with flow regulation and water quality being major concerns. Dams can promote the retention of sediments and nutrients, increase water transparency, and reduce primary productivity, all of which characterize the oligotrophication process. Although the beneficial effects of oligotrophication in eutrophic systems are well documented, the oligotrophication process caused by river impoundment can negatively affect aquatic communities in non‐eutrophic systems. Our study aimed to assess the effects of oligotrophication on the specific growth rate of small‐bodied fish. We hypothesized that the fish‐specific growth rate would decrease under an oligotrophic scenario, due to bottom‐up processes. We performed a full‐factorial experiment with nine treatments, using three levels of inorganic turbidity crossed by three levels of nutrients, in mesocosms during 24 d. In each tank, we added plankton and 30 individuals of <jats:italic>Moenkhausia forestii</jats:italic>, a fish species with omnivorous feeding habits. The fish were weighed at the beginning and at the end of the experiment to calculate specific growth rates. We observed a significant interaction between inorganic turbidity and nutrients on the specific growth. The smallest reduction in growth rate occurred in treatments with intermediate turbidity and high nutrient levels (T2N3), and high turbidity and high nutrient levels (T3N3). Our results indicate that changes in inorganic turbidity and nutrients, coinciding with oligotrophication caused by river dams, would negatively affect fish growth, which could have severe implications for fishery production and irreversible impacts on aquatic ecosystems.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"160 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2025-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144906152","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 & Masthead","authors":"","doi":"10.1002/lno.70176","DOIUrl":"https://doi.org/10.1002/lno.70176","url":null,"abstract":"","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 8","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://aslopubs.onlinelibrary.wiley.com/doi/epdf/10.1002/lno.70176","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144888224","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 & Copyright","authors":"","doi":"10.1002/lno.70175","DOIUrl":"https://doi.org/10.1002/lno.70175","url":null,"abstract":"","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 8","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://aslopubs.onlinelibrary.wiley.com/doi/epdf/10.1002/lno.70175","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144888155","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":"Short‐term net community production enhanced by internal wave–driven nutrient supply in the lower euphotic zone of the western subtropical North Pacific","authors":"Fuminori Hashihama, Takeyoshi Nagai, Takuhei Shiozaki, Ichiro Yasuda, Hiroaki Saito, Hiroshi Ogawa","doi":"10.1002/lno.70183","DOIUrl":"https://doi.org/10.1002/lno.70183","url":null,"abstract":"The metabolic status of lower euphotic zones (EZs) in subtropical oceans—whether they are net autotrophic or heterotrophic—has been a subject of debate. In this study, we demonstrated net community production (NCP) enhanced by internal wave–driven nutrient supply in the lower EZ of the western subtropical North Pacific. Near 6‐h interval observations conducted from July 20, 2016 to July 28, 2016 at a fixed station revealed oxygen production and nutrient consumption in the deep layer around a potential density of 25 <jats:italic>σ</jats:italic><jats:sub><jats:italic>θ</jats:italic></jats:sub> (129–161 m depth), where relative irradiance to the surface was less than 1%. On July 25–26, internal waves generated strong turbulence, driving an upward nutrient supply. Following this event, the 25 <jats:italic>σ</jats:italic><jats:sub><jats:italic>θ</jats:italic></jats:sub> isopycnal was maintained at a shallower depth for one and a half days, providing favorable conditions for nutrient utilization by photoautotrophs. Over the study period, increased oxygen in the upper 200 m was estimated at 0.95 ± 0.40 mol m<jats:sup>−2</jats:sup>, corresponding to decreases in nitrogen and phosphorus of 0.049 ± 0.042 and 0.0030 ± 0.0027 mol m<jats:sup>−2</jats:sup>, respectively. This indicated that their O<jats:sub>2</jats:sub> : N : P stoichiometry (313 ± 305 : 16 ± 20 : 1) overlapped with the canonical Redfield stoichiometry. The observed NCP statistically corresponded to approximately half of the annual NCP in subtropical oceans, although this short‐term NCP may have been offset by respiration over time. This study demonstrated that the lower EZ could temporarily exhibit net autotrophy, with NCP enhanced by internal wave–driven nutrient supply.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"15 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2025-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144900621","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":"Environmental controls of autotrophic biofilm biomass and community composition in subarctic lakes and streams in Greenland","authors":"Sanne Mariël Moedt, Tenna Riis, Dean Jacobsen, Ole Geertz‐Hansen, Kenneth Thorø Martinsen, Kirsten Seestern Christoffersen","doi":"10.1002/lno.70188","DOIUrl":"https://doi.org/10.1002/lno.70188","url":null,"abstract":"Photosynthetic biofilms are key components of Arctic freshwater ecosystems, supporting primary production and forming the base of aquatic food webs. While several environmental factors regulating biofilms are known, their relative importance and connection to catchment characteristics across different Arctic ecosystems remain unclear. This study assessed epilithic biofilm biomass and autotrophic community composition in lakes and streams near Narsaq, South Greenland. Lake biofilms were dominated by cyanobacteria, with autotrophic biomass positively associated with catchment greenness and water conductivity. In streams, biofilms primarily comprised diatoms and green algae, with autotrophic biomass linked to phosphate, pH, and temperature. Total biofilm biomass in lakes was also related to catchment greenness and conductivity, while no consistent environmental drivers were found for stream biomass. These findings underscore how environmental controls on biofilm structure differ between lentic and lotic systems. As climate warming intensifies tundra greening and alters nutrient regimes, autotrophic biofilm biomass is likely to increase, potentially affecting food web dynamics and carbon cycling in Arctic freshwater ecosystems. Our findings advance the understanding of Arctic freshwater biofilm dynamics and their sensitivity to climate‐driven changes.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"24 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2025-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144901925","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":"Grazing by sea urchins is a potential co‐driver of Greenland kelp forest distribution","authors":"Jakob Breinholt Kjær, Susse Wegeberg, Mikael K. Sejr, Birgit Olesen, Núria Marbà, Michael Bo Rasmussen, Martin Emil Blicher, Annette Bruhn, Jørgen L. S. Hansen, Jannie Fries Linnebjerg, Dorte Krause‐Jensen","doi":"10.1002/lno.70150","DOIUrl":"https://doi.org/10.1002/lno.70150","url":null,"abstract":"Grazing by sea urchins is a main driver of kelp forest dynamics causing shifts from kelp forests to urchin barrens in the temperate region but there is limited information on such patterns from the Arctic region. Based on information from 132 underwater video transects along Greenland's West Coast at 59.9–77.8°N, we explored the distribution of kelps and sea urchins, including the occurrence of sea urchin barrens, along latitudinal‐ and depth‐gradients. We observed more extended kelp cover and deeper‐growing kelp forests toward south, although with marked variability among sites. Sea urchins were present along the entire West Coast, with no clear depth‐related pattern, but their densities were generally higher toward north. Kelp cover declined toward deeper, light‐limited waters and was also reduced where sea urchins were abundant, in some cases with urchin barrens within the kelp beds, suggesting a potential top‐down control of kelp distribution by sea urchins. Sea urchins left, on average, 10% of the potential kelp area barren, with the largest proportion (20%) of barren ground toward north. Earlier studies have identified the length of the sea‐ice free period and water temperature as main bottom‐up drivers of spatial distribution of kelp in this region. We conclude that sea urchins are present all along Greenland's West Coast and occur at densities suggesting they may act as local co‐drivers of kelp forest distribution and cover.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"52 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2025-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144850857","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":"Biomass‐to‐volume ratio as a central continuous functional trait for marine zooplankton","authors":"Julie Lemoine, Sakina‐Dorothée Ayata, Cornelia Jaspers, Fabien Lombard","doi":"10.1002/lno.70171","DOIUrl":"https://doi.org/10.1002/lno.70171","url":null,"abstract":"Gelatinous zooplankton are an important component of many ecosystems and important for ecosystem structure and carbon cycling. However, this group is generally not considered in biogeochemical models. Here we investigate the biomass‐to‐volume ratio as an underappreciated “master trait” that allows for the incorporation of a large diversity of zooplankton groups into modeling exercises. By considering the biomass‐to‐volume ratio as a continuum, we investigate the potential trade‐offs between body composition and physiological (e.g., clearance, respiration, carbon mass‐specific growth, assimilation) as well as ecological (e.g., predator–prey size ratio, feeding modes) traits. We find that a low carbon composition has a positive effect on the organism's fitness, as more prey could be captured for the same active mass. Thus, taking the biomass‐to‐volume ratio into account could improve the estimation of physiological rates. Additionally, we show that gelatinous feeding‐current feeders (e.g., tunicata, <jats:italic>Mnemiopsis</jats:italic> spp., <jats:italic>Rhizostoma</jats:italic> spp.) have an ability to catch smaller prey over a wider size range than non‐gelatinous feeding‐current feeding organisms (gelatinous feeding‐current feeders min–max: 10<jats:sup>2</jats:sup>–10<jats:sup>6</jats:sup> <jats:italic>μ</jats:italic>m<jats:sub>predator</jats:sub> <jats:italic>μ</jats:italic>m<jats:sub>prey</jats:sub><jats:sup>−1</jats:sup>; non‐gelatinous feeding‐current feeders min–max: 5 × 10<jats:sup>0</jats:sup>–8 × 10<jats:sup>1</jats:sup> <jats:italic>μ</jats:italic>m<jats:sub>predator</jats:sub> <jats:italic>μ</jats:italic>m<jats:sub>prey</jats:sub><jats:sup>−1</jats:sup>). However, results are only valid for the respective feeding mode, highlighting new trade‐offs. This allows us to re‐evaluate the functional role of certain organisms, such as larvaceans (appendicularians), which were previously considered to be super‐filters, or pteropods, which remain understudied. This study contributes to a wider representation of the complexity of the zooplankton community in size‐structured models. We highlight that the biomass‐to‐volume ratio, along with size, is the most important parameter required to represent the full diversity of zooplankton.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"95 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2025-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144850860","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}