Limnology and Oceanography最新文献

{"title":"Co‐occurrence and successional patterns among diatoms, dinoflagellates, and potential parasites in a coastal upwelling experiment","authors":"Joseph H. Vineis, Jessica M. Burger, Sarah E. Fawcett, Bess B. Ward","doi":"10.1002/lno.70048","DOIUrl":"https://doi.org/10.1002/lno.70048","url":null,"abstract":"Diatom‐dominated blooms in coastal upwelling systems contribute disproportionately to global primary production. The fate of carbon captured during a diatom bloom is often influenced by species‐specific ecological differences. However, successional patterns that take place during a diatom bloom are often oversimplified, and the diversity of diatom adaptations to different stages of a bloom remains poorly characterized. To improve our understanding of diatom specificity to certain conditions within a bloom, we employed microscopy, 18S rRNA amplicons, and biogeochemical analysis within a simulated upwelling mesocosm experiment. We successfully simulated a diatom bloom and found that diatoms bloomed during early and late phases of the bloom. Surprisingly, the relative abundance of congeneric diatoms with the <jats:italic>Thalassiosira</jats:italic>, <jats:italic>Chaetoceros</jats:italic>, and <jats:italic>Pseudonitzschia</jats:italic> displayed opposing patterns that were consistent among experimental mesocosms. The late stage of the bloom was especially interesting because some diatoms continued to bloom among mixotrophic dinoflagellate genera <jats:italic>Akashiwo</jats:italic>, <jats:italic>Heterocapsa</jats:italic>, and <jats:italic>Prorocentrum</jats:italic>. Additionally, Syndiniales putative parasites were correlated with several diatoms, especially in the initial phase of the bloom. The novel observations of consistent rapid successional changes within our mesocosms reflect the ability of diatom and dinoflagellate genera to occupy bloom conditions that fall outside traditional expectations. Syndiniales parasite co‐occurrence with blooming diatoms may be important to successional trends of coastal diatom populations, and this parasitic interaction deserves further study in coastal upwelling systems. This study indicates there are underlying diatom traits and biotic interactions that should be considered when estimating their contribution to productivity and carbon cycling within upwelling systems.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"16 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143805588","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":"Seasonality modulates coral trophic plasticity in an extreme, multi‐stressor environment","authors":"Sarah L. Solomon, Jasper M. de Goeij, Emily M. Croasdale, Verena Schoepf","doi":"10.1002/lno.70046","DOIUrl":"https://doi.org/10.1002/lno.70046","url":null,"abstract":"Corals with high trophic plasticity, i.e., the ability to change the relative contribution of heterotrophic and autotrophic nutrition to their mixotrophic diet, can have increased tolerance to individual stressors, but it is poorly understood how trophic strategies shift in response to combined global (e.g., warming, acidification) and local stressors (e.g., nutrient input). Furthermore, it remains unclear how season‐associated changes in physicochemical conditions modulate trophic strategies and which coral species generally have trophic plasticity. We measured the tissue stable isotopes (δ<jats:sup>13</jats:sup>C and δ<jats:sup>15</jats:sup>N) of three coral species (<jats:styled-content style=\"fixed-case\"><jats:italic>Siderastrea siderea</jats:italic></jats:styled-content>, <jats:styled-content style=\"fixed-case\"><jats:italic>Siderastrea radians</jats:italic></jats:styled-content>, and branching <jats:italic>Porites</jats:italic> sp.) from two distinct habitats: extreme, multi‐stressor inland bay habitats and nearby fringing reefs with more benign environmental conditions. We further captured trophic plasticity between dry and wet seasons, as well as the effects of in situ heat stress on trophic strategies. Bay corals tended to be more autotrophic than fringing reef corals, which may be driven by higher nutrient input in the bays. All three coral species shifted their trophic strategy between the cool dry and warm wet seasons; however, the direction of trophic shifts varied between δ<jats:sup>13</jats:sup>C and δ<jats:sup>15</jats:sup>N. Bay <jats:styled-content style=\"fixed-case\"><jats:italic>S. siderea</jats:italic></jats:styled-content> had the highest trophic plasticity across seasons, which likely facilitates their success in these multi‐stressor habitats. Interestingly, not all species relied equally on heterotrophy, as bay <jats:italic>Porites</jats:italic> had a primarily autotrophic diet, even during the wet season when conditions were more extreme. This highlights that coral tolerance to more extreme conditions is promoted through dynamic shifts in diet, rather than only increasing heterotrophy.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"59 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143784676","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":"Water column ammonium regeneration supports productivity in two large, eutrophic lakes","authors":"Margot Sepp, Marju Tamm, Silvia E. Newell, Justin A. Myers, Triin Hunt, Kadi Palmik‐Das, Lea Tuvikene, Peeter Nõges, Tiina Nõges, Mark J. McCarthy","doi":"10.1002/lno.70047","DOIUrl":"https://doi.org/10.1002/lno.70047","url":null,"abstract":"Phytoplankton often rely on the regeneration of ammonium () to produce biomass and, for some cyanobacteria, nitrogen‐rich toxins, despite low or unmeasurable concentrations in water. Thus, measuring turnover rates (i.e., uptake and regeneration) is necessary to determine its actual availability. The objectives of this study were to quantify water column turnover rates in two large, shallow, eutrophic, cyanobacteria‐dominated lakes in Estonia (Lakes Võrtsjärv and Peipsi), explore which in‐lake variables drive these processes, and evaluate the importance of internal nitrogen loading in supporting community uptake. Stable isotope () incubations were conducted almost monthly in Võrtsjärv and several times per year in Peipsi (from March 2019 to March 2022). Despite being located at a higher latitude, turnover rates in Võrtsjärv and Peipsi were similar to those reported for other large, eutrophic lakes. turnover rates were strongly related to seasonally changing water quality variables, including temperature, nutrient concentrations, and chlorophyll <jats:italic>a</jats:italic> concentrations, which, combined, explained 68–71% of the variation in measured rates. regeneration supported, on average, 65.2% ± 9.6% (in Võrtsjärv) and 75.6% ± 16.8% (in Peipsi) of community uptake during the warm season (May to October). For 2020, estimated internal nitrogen loading from regeneration in the water column exceeded, by ~ 18 times, estimated external nitrogen loading to Võrtsjärv from the three main inflows. These results emphasize the importance of internal nitrogen loading in driving primary productivity in lakes and highlight the necessity to reduce external nitrogen loading, in addition to phosphorus, into eutrophic lakes.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"30 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143757761","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":"Differential effects of Daphnia genotype composition on spatial environmental heterogeneity in experimental metacommunities","authors":"Romana Limberger, Jenny Spaak, Helmut Bürgmann, Piet Spaak, Blake Matthews","doi":"10.1002/lno.70043","DOIUrl":"https://doi.org/10.1002/lno.70043","url":null,"abstract":"Spatial environmental heterogeneity is an important driver of aquatic biodiversity. Ecological and evolutionary theory often consider spatial heterogeneity as being driven by exogenous factors, yet heterogeneity can also be generated and modified by organisms. Here we used a mesocosm experiment to investigate if consumers influence the build‐up of spatial heterogeneity. We expected that consumer effects on heterogeneity would depend on consumer composition and differ among response variables. We constructed metacommunities consisting of three mesocosms and manipulated the presence and composition of consumers, using four treatment levels: (1) no consumers, (2) two genotypes of <jats:italic>Daphnia galeata</jats:italic>, (3) <jats:italic>D. galeata</jats:italic> and <jats:italic>Daphnia longispina</jats:italic>, and (4) <jats:italic>D. galeata</jats:italic> and a hybrid of <jats:italic>D. galeata × D. longispina</jats:italic>. We then continuously increased heterogeneity among the three patches of each metacommunity by adding nutrients and dissolved organic carbon (DOC), respectively, to two of the three mesocosms. We found that consumers affected the build‐up of heterogeneity, but the direction and magnitude of this effect differed among consumer compositions. Metacommunities with only <jats:italic>D. galeata</jats:italic> had increased heterogeneity in phytoplankton biomass, whereas metacommunities with <jats:italic>D. longispina</jats:italic> or the hybrid had low phytoplankton heterogeneity. The differential effects of <jats:italic>Daphnia</jats:italic> taxa on phytoplankton heterogeneity cascaded down to the abiotic environment and resulted in taxon‐specific effects on heterogeneity in light extinction, dissolved inorganic nitrogen, and total inorganic carbon. Our results imply that changes in consumer species (e.g., due to environmental change or invasion) might affect not only the local environment but could also impact heterogeneity among environments, with important consequences for aquatic biodiversity.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"26 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2025-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143736621","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":"Dynamics of surface accretion and surface elevation differ between river and tide dominated settings in tropical mangroves","authors":"Catherine E. Lovelock, Marilyn C. Ball, Nigel Brothers, Alex Pearse, Ruth Reef","doi":"10.1002/lno.70024","DOIUrl":"https://doi.org/10.1002/lno.70024","url":null,"abstract":"The maintenance of soil surface elevation in mangroves supports the persistence of mangroves with sea level rise. The processes contributing to soil surface elevation have rarely been assessed in the humid tropics, despite most mangroves occurring in river deltas and tidal estuaries within this climate zone. Using surface elevation table (SET) with marker horizon methods over sites that occurred on either the main river channel or a tidal channel, we assessed the role of rainfall and associated river discharge in moderating surface elevation in mangroves of the Daintree River, Queensland, Australia. In the sites in the main river channel close to the river mouth, increases in soil surface elevation were episodic, with river flooding leading to greater accretion of sediment and increases in surface elevation in years with high river discharge, while in the tidal channel further from the mouth, sediment accretion and surface elevation increments were variable among years and not linked to river discharge. Our study finds that the 32.7 km<jats:sup>2</jats:sup> of mangroves of the Daintree River estuary have surface elevation gains that are variable but similar to current rates of sea level rise through trapping of around 40,000 t of sediment annually, mainly within the downstream mangroves and those in the main river channel. Extreme rainfall and river flows have spatially variable influences on surface elevation in mangroves of the Daintree River, which may lead to similarly variable responses to accelerating sea level rise.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"66 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143734136","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":"Trout have weak effects on zooplankton diversity but strong effects on community biomass","authors":"Matthew D. Green, Kurt E. Anderson","doi":"10.1002/lno.70041","DOIUrl":"https://doi.org/10.1002/lno.70041","url":null,"abstract":"The introduction and extirpation of predators can have large impacts on food web structure and ecosystem function. The magnitude of these predator effects can be influenced by species diversity and turnover along environmental gradients in space or time, which have the potential to buffer or magnify the impact of trophic interactions on ecosystem functioning. In this study, we explored the individual species and community effects of fish predators on lake zooplankton in the Sierra Nevada, CA, USA. Local and beta diversity in zooplankton communities were resilient to fish, only marginally differing among fish and fishless sites, and were more structured along elevational gradients. Observed diversity changes were attributed to species turnover in zooplankton communities, which suggests elevational gradients and fish are acting as ecological filters excluding subsets of species rather than reducing species density. We found that fish significantly reduced densities of larger‐bodied zooplankton species. Further, as larger‐bodied species densities were lower in the presence of fish, we found that the community weighted mean of body mass decreased in the presence of fish in lakes. Although species turnover largely maintained diversity over elevational gradients and in the presence of fish, such changes in larger‐bodied taxa and community biomass may have important implications in the transfer of energy throughout the food web and to connected riparian and aquatic ecosystems that are dependent on the flow of biomass and nutrients.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"7 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143734106","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":"Correction to: Summer dynamics drive the microbial response to carbon and nutrient additions in a high-altitude lake","authors":"","doi":"10.1002/lno.12472","DOIUrl":"10.1002/lno.12472","url":null,"abstract":"<p>Dory, F., L. Cavalli, E. Franquet, M. Claeys-Bruno, B. Misson, T. Tatoni, and C. Bertrand. 2022. Summer dynamics drive the microbial response to carbon and nutrient additions in a high-altitude lake. Limnol. Oceanogr. <b>67</b>: 1142–1156. https://doi.org/10.1002/lno.12062</p><p>The captions for Supporting Information Figs. S1–S5 were mistakenly assigned to Figs. 1–5 in the main document. They have been replaced with the correct captions.</p><p><b>Fig. 1.</b> Experimental design performed in early summer and in late summer, with four carbon additions (0, 2, 4, 6 mg C L⁻¹), two nutrient concentrations (0NP and +N+P), two light treatments (light and dark), and two temperatures (10°C and 18°C), in three replicates.</p><p><b>Fig. 2.</b> DOC change in the microcosms between initial conditions and end of experiments, in early summer and late summer. Concentrations are shown for each glucose addition (white for control; gray for glucose additions), without nutrients and with nutrients (+N+P). The boxplots show the median, the interquartile range and the tails of the distribution, including the two temperatures and light conditions. Regression lines show the glucose addition effect in each campaign and nutrient enrichment.</p><p><b>Fig. 3.</b> Heterotrophic prokaryotic plankton (HPP) biomass per experimental day, in early summer and late summer. Dynamics are supposed to be linear between the day 0 and the day 6. Biomass is shown for each glucose addition, without nutrients and with nutrients (+N+P). Points represent the HPP biomass in all conditions of temperature and light, and regression lines show the glucose addition effect in each campaign and nutrient enrichment.</p><p><b>Fig. 4.</b> Phytoplankton groups' relative biomass and total absolute biomass (black points) at the end of experiments, in early summer and late summer. Biomass is shown for each glucose and nutrient treatments under the four temperature × light conditions.</p><p><b>Fig. 5.</b> Scheme of the phytoplankton regulation of bacterial response to glucose addition in early summer and late summer. Black lines represent processes that are reinforced (heavy line) or weakened (light line). Dashed lines represent variables or processes not measured. GLU = glucose; DOC = dissolved organic carbon; CL = ciliates; MX = mixotrophs; AT = autotrophs; HPP_BioM = Heterotrophic prokaryotic plankton biomass; Phyto_BioM = phytoplankton biomass; DOC_PHYTO = phytoplankton-derived DOC.</p>","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 4","pages":"1108"},"PeriodicalIF":3.8,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.12472","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143734109","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":"Temporal methane dynamics in the surface waters of a stratified eutrophic lake over four years","authors":"César Ordóñez, Alexandrine Massot, Tonya DelSontro, Timon Langenegger, Daphne Donis, Daniel F. McGinnis","doi":"10.1002/lno.70020","DOIUrl":"https://doi.org/10.1002/lno.70020","url":null,"abstract":"The occurrence of oxic methane production (OMP) has been reported for numerous aquatic ecosystems. Its seasonal dynamics and contribution to global methane () emissions remains uncertain, however, due to the lack of measurements constraining the spatial and temporal variability of OMP. In this study, we used data collected over 4 yrs with three types of models to estimate the net production/consumption of () in the surface mixed layer of a eutrophic lake. These models allowed us to assess the lateral contribution and the surface fluxes' variability on estimations. All model results show positive rates suggesting that OMP occurs consistently during the stratified period and was often the dominant source of surface diffusive emissions. In years with monthly data, we observed a consistent pattern of high rates at the start of stratification and a decrease towards the end of the stratified season. Along with the trends and in agreement with recent findings, correlations between vs. Secchi depth, chlorophyll <jats:italic>a</jats:italic> concentrations and light climate suggest that photoautotrophs play a role in production. Finally, using an isotopic mass balance model, we determined that the stable carbon isotopic signature of in this lake was likely between and , which aligns with published work. Clearly, OMP can be a significant component of an aquatic budget of eutrophic systems, but can vary temporally; thus, temporal variability should be considered when assessing the global contribution of OMP to aquatic emissions, particularly in systems experiencing or threatened by eutrophication.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"63 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143723311","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 & Members form","authors":"","doi":"10.1002/lno.70037","DOIUrl":"https://doi.org/10.1002/lno.70037","url":null,"abstract":"","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 3","pages":"iv"},"PeriodicalIF":3.8,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.70037","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143707586","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.70036","DOIUrl":"https://doi.org/10.1002/lno.70036","url":null,"abstract":"","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 3","pages":"i"},"PeriodicalIF":3.8,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.70036","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143707272","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}