Ximena Velasquez, Tal Ozer, Maria Grazia Mazzocchi, Francois Carlotti, Dalit Meron, Mireille Pujo‐Pay, Pascal Conan, Xavier Durrieu de Madron, Tamar Guy‐Haim
{"title":"Copepod‐associated microbial biogeography in the epipelagic ocean","authors":"Ximena Velasquez, Tal Ozer, Maria Grazia Mazzocchi, Francois Carlotti, Dalit Meron, Mireille Pujo‐Pay, Pascal Conan, Xavier Durrieu de Madron, Tamar Guy‐Haim","doi":"10.1002/lol2.70054","DOIUrl":"https://doi.org/10.1002/lol2.70054","url":null,"abstract":"Zooplankton‐microbial interactions play crucial roles in epipelagic ecosystem functions. The distinct west‐to‐east gradients and complex circulation patterns in the Mediterranean Sea, combined with the ubiquity of pelagic copepods, provide an ideal model to study the ecological processes driving host‐associated microbial spatial distribution. Here, we characterized and compared the copepod‐associated microbial metacommunities (CAMC) with those from seawater microbial metacommunities (SMC). Copepod‐associated microbial metacommunities displayed spatial dissimilarity between the western and eastern basins, while SMC exhibited similar microbial compositions. The within‐basin similarity observed in CAMC was associated with connectivity by the surface currents. Ecological drift explained most of CAMC variability, likely as a response to the restricted co‐dispersal of the hosts with their microbes, which presented low prevalence and abundance. Seawater microbial metacommunities displayed higher homogenizing dispersal, with widely distributed generalist taxa. We conclude that CAMC better reflect cross‐basin gradients and connectivity patterns than SMC, suggesting that CAMC may serve as a useful proxy for studying microbial biogeography.","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"104 1","pages":""},"PeriodicalIF":7.8,"publicationDate":"2025-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144850854","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Matthew R. Hipsey, Cayelan C. Carey, Justin D. Brookes, Michele A. Burford, Hoang V. Dang, Bas W. Ibelings, David P. Hamilton
{"title":"Integrating phytoplankton phenology, traits, and model‐data fusion to advance bloom prediction","authors":"Matthew R. Hipsey, Cayelan C. Carey, Justin D. Brookes, Michele A. Burford, Hoang V. Dang, Bas W. Ibelings, David P. Hamilton","doi":"10.1002/lol2.70052","DOIUrl":"https://doi.org/10.1002/lol2.70052","url":null,"abstract":"While there is a diversity of approaches for modeling phytoplankton blooms, their accuracy in predicting the onset and manifestation of a bloom is still lagging behind what is needed to support effective management. We outline a framework that integrates trait theory and ecosystem modeling to improve bloom prediction. This framework builds on the concept that the phenology of blooms is determined by the dynamic interaction between the environment and traits within the phytoplankton community. Phytoplankton groups exhibit a collection of traits that govern the interplay of processes that ultimately control the phases of bloom initiation, maintenance, and collapse. An example of process‐trait mapping is used to demonstrate a more consistent approach to bloom model parameterization that allows better alignment with models and laboratory‐ and ecosystem‐scale datasets. Further approaches linking statistical‐mechanistic models to trait parameter databases are discussed as a way to help optimize models to better simulate bloom phenology and allow them to support a wider range of management needs.","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"478 1","pages":""},"PeriodicalIF":7.8,"publicationDate":"2025-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144850856","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Sequestration by the biological carbon pump: Do we really know what we are talking about?","authors":"Andre W. Visser","doi":"10.1002/lol2.70053","DOIUrl":"https://doi.org/10.1002/lol2.70053","url":null,"abstract":"","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"183 1","pages":""},"PeriodicalIF":7.8,"publicationDate":"2025-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144850859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Elena Terzić, Vanessa Cardin, Julien Le Meur, Natalija Dunić, Martin Vodopivec, Ivica Vilibić
{"title":"Unprecedented warming and salinization observed in the deep Adriatic","authors":"Elena Terzić, Vanessa Cardin, Julien Le Meur, Natalija Dunić, Martin Vodopivec, Ivica Vilibić","doi":"10.1002/lol2.70051","DOIUrl":"https://doi.org/10.1002/lol2.70051","url":null,"abstract":"The deep Southern Adriatic is a Mediterranean region highly sensitive to climate change, influenced by dense water cascading from the northern Adriatic and heat/salt transport from the Eastern Mediterranean. Historical (since 1957) and modern (permanent and opportunistic temperature and salinity sampling, Argo floats, fixed moorings) measurements reveal a substantial change since the mid‐2000s in thermohaline properties. Historically marked by steady increases in temperature, salinity, and density, with substantial saw‐tooth decadal variability, the near‐bottom Southern Adriatic has experienced unprecedented warming (0.8°C) and salinization (0.2) over the past decade, accelerating in time and reversing density trends. The inflow of much more saline waters reduced stratification and altered dense water properties at its source in the northern Adriatic. This at least fivefold acceleration of the high‐emission regional climate projections may have substantial effects on the Adriatic biogeochemistry and living organisms, changing sea level trends and more.","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"13 1","pages":""},"PeriodicalIF":7.8,"publicationDate":"2025-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144770037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Asmita Singh, Sandy J. Thomalla, Susanne Fietz, Saumik Samanta, Thato N. Mtshali, Alakendra N. Roychoudhury, Johannes J. Viljoen, Thomas J. Ryan‐Keogh
{"title":"Phytoplankton iron limitation in the Atlantic Southern Ocean driven by seasonal mixed‐layer dynamics","authors":"Asmita Singh, Sandy J. Thomalla, Susanne Fietz, Saumik Samanta, Thato N. Mtshali, Alakendra N. Roychoudhury, Johannes J. Viljoen, Thomas J. Ryan‐Keogh","doi":"10.1002/lol2.70049","DOIUrl":"https://doi.org/10.1002/lol2.70049","url":null,"abstract":"Phytoplankton blooms in the Southern Ocean (SO) are seasonally limited by light and micronutrients. As such, regional variations in iron supply from mixed‐layer winter entrainment are expected to impact the extent of seasonal iron limitation. Here, we determined seasonal iron limitation in the Atlantic SO by conducting iron addition incubation experiments during winter, prior to the maximum mixed‐layer deepening, and in spring, prior to the peak of the summer bloom. Both the polar and subantarctic zones displayed evidence of iron limitation in spring, based on increased photosynthetic efficiency, with evidence of the subantarctic zone being limited in winter. In contrast, there was no evidence of limitation in either season in the sub‐tropical and Antarctic zones. The large degree of zonal variability in the timing of iron supply resulting from winter entrainment impacts the seasonal characteristics of iron limitation, phytoplankton physiology and the potential for growth.","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"15 1","pages":""},"PeriodicalIF":7.8,"publicationDate":"2025-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144763442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Lina A. Holthusen, Hermann W. Bange, Damian L. Arévalo‐Martínez, Thomas H. Badewien, Juan Höfer, Carolin R. Löscher, Camila Marín‐Arias, Jens Meyerjürgens, Isabell Schlangen, Oliver Wurl
{"title":"Glacial meltwater drives high CH4 supersaturation in Maxwell Bay, King George Island (Southern Ocean)","authors":"Lina A. Holthusen, Hermann W. Bange, Damian L. Arévalo‐Martínez, Thomas H. Badewien, Juan Höfer, Carolin R. Löscher, Camila Marín‐Arias, Jens Meyerjürgens, Isabell Schlangen, Oliver Wurl","doi":"10.1002/lol2.70045","DOIUrl":"https://doi.org/10.1002/lol2.70045","url":null,"abstract":"Coastal waters exhibit the highest and most dynamic dissolved CH<jats:sub>4</jats:sub> concentrations in marine environments, but significant knowledge gaps on the distribution and emissions, particularly in the Southern Ocean, still exist. We quantified dissolved CH<jats:sub>4</jats:sub> concentrations and sea–air fluxes in the coastal waters of Maxwell Bay, King George Island, Antarctica, in December 2023. Surface waters showed exceptionally high CH<jats:sub>4</jats:sub> supersaturations (213–2342%), associated with lower salinity and higher turbidity, which were attributed primarily to meltwater discharge from a retreating tidewater glacier. Our findings suggest that glacial melt may significantly increase CH<jats:sub>4</jats:sub> emissions from Antarctic coastal waters, highlighting the need for further research to understand CH<jats:sub>4</jats:sub> dynamics and improve emission estimates in the context of accelerating climate‐driven glacial melt.","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"287 1","pages":""},"PeriodicalIF":7.8,"publicationDate":"2025-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144766165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Artificial island construction exacerbates storm‐induced loss of buried estuarine carbon","authors":"Yijing Wu, Jianfeng Su, Yang Yang, Daidu Fan","doi":"10.1002/lol2.70048","DOIUrl":"https://doi.org/10.1002/lol2.70048","url":null,"abstract":"Storm deposition is critical for burying estuarine sedimentary organic carbon (OC), yet how this process responds to artificial island construction remains unclear. We examined this issue by comparing lithology, elemental and organic geochemistry, and <jats:sup>210</jats:sup>Pb and <jats:sup>137</jats:sup>Cs profiles of two sediment cores retrieved 1 yr apart near the newly constructed Zhoushan Green Petrochemical Base (ZGPB) in Hangzhou Bay, China. We identified a post‐construction storm deposit of unprecedented thickness, likely formed by high‐turbidity flows linked to a storm‐triggered submarine landslide near ZGPB. The associated substantial OC burial during storm's waning phase was far outweighed by OC loss due to severe erosion during its waxing phase. This net OC loss was further exacerbated by enhanced remineralization within the thick deposit. These findings underscore the necessity for holistic planning of artificial islands, as their construction may amplify coastal vulnerability to emerging geohazards and undermine estuarine carbon storage capacity.","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"109 1","pages":""},"PeriodicalIF":7.8,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144639829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Cale A. C. Gushulak, Timothy H. Bertram, Hilary A. Dugan, Jennifer A. Franck, Martina N. Rogers, Samuel T. Salemink‐Harry, Benjamin J. Smith, Till J. W. Wagner, Lucas K. Zoet, Nimish Pujara, Grace M. Wilkinson
{"title":"The role of surface water waves on cyanobacterial blooms in lakes","authors":"Cale A. C. Gushulak, Timothy H. Bertram, Hilary A. Dugan, Jennifer A. Franck, Martina N. Rogers, Samuel T. Salemink‐Harry, Benjamin J. Smith, Till J. W. Wagner, Lucas K. Zoet, Nimish Pujara, Grace M. Wilkinson","doi":"10.1002/lol2.70044","DOIUrl":"https://doi.org/10.1002/lol2.70044","url":null,"abstract":"The biophysical processes by which wind‐driven surface waves influence cyanobacterial bloom formation, transport, aerosolization, and termination in lakes represent a major knowledge gap in our understanding of bloom dynamics. We synthesized the literature that examined how waves interact with cyanobacterial bloom processes including: cyanobacterial recruitment to inoculate blooms, sediment nutrient resuspension, the transport, aggregation, and disaggregation of bloom biomass by various wave‐driven physical processes (e.g., Stokes drift, Langmuir circulation), and the aerosolization of bloom biomass and cyanotoxins. Using this synthesis, we present a set of testable hypotheses and concepts that can be used to direct future research to better understand the mechanisms that may regulate wave and bloom interactions. Further, we highlight the differences in spatial and temporal scales that these processes act upon, and argue that mechanistic research into wave and bloom interactions must be applicable to whole ecosystems to be relevant in improving bloom management strategies.","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"46 1","pages":""},"PeriodicalIF":7.8,"publicationDate":"2025-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144566208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Harnessing nature's buffer: Assessing the role of bivalve shells in coastal alkalinity regeneration","authors":"Hongjie Wang, Fiona Teevan‐Kamhawi, Olivia Rebernik","doi":"10.1002/lol2.70033","DOIUrl":"https://doi.org/10.1002/lol2.70033","url":null,"abstract":"Bivalve shells, a natural alkaline material, play a crucial role in coastal carbon cycles by influencing total alkalinity (TA) and dissolved inorganic carbon (DIC). This study investigated oyster shell dissolution in Narragansett Bay, Rhode Island, under varying <jats:italic>p</jats:italic>CO<jats:sub>2</jats:sub> conditions, revealing TA regeneration rates of 4–56 <jats:italic>μ</jats:italic>mol L<jats:sup>−1</jats:sup> d<jats:sup>−1</jats:sup>, which could mitigate localized ocean acidification (OA). Notably, significant dissolution occurred even in oversaturated waters (Ω<jats:sub>calcite</jats:sub> > 1) due to corrosive microenvironments created by microbial respiration. Although shell formation (calcification) emits CO<jats:sub>2</jats:sub>, TA regeneration (shell dissolution) buffers OA when the carbonate chemistry of the water is corrosive, offsetting the initial CO<jats:sub>2</jats:sub> emissions. Therefore, recycling shells enhances ecosystem resilience by buffering acidification stress for OA‐sensitive organisms. This research highlights the need to revisit shell management policies to promote sustainable aquaculture and sheds light on the potential of incorporating this nature‐based alkaline material into ocean alkalinity enhancement strategies for improved coastal carbon management.","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"27 1","pages":""},"PeriodicalIF":7.8,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144520500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Kyle F. Edwards, Kelsey A. McBeain, Christopher R. Schvarcz, Grieg F. Steward
{"title":"Large, double‐stranded DNA viruses tend to suppress phytoplankton populations more effectively than small viruses of diverse genome type","authors":"Kyle F. Edwards, Kelsey A. McBeain, Christopher R. Schvarcz, Grieg F. Steward","doi":"10.1002/lol2.70035","DOIUrl":"https://doi.org/10.1002/lol2.70035","url":null,"abstract":"Viruses infecting aquatic microbes vary immensely in size, but the ecological consequences of virus size are poorly understood. Here we used a unique suite of diverse phytoplankton strains and their viruses, all isolated from waters around Hawai'i, to assess whether virus size affects the suppression of host populations. We found that small viruses of diverse genome type (3–24 kb genome size, 23–70 nm capsid diameter) have very similar effects on host populations, suppressing hosts less strongly and for a shorter period of time compared to large double‐stranded DNA viruses (214–1380 kb, 112–386 nm). Suppressive effects of larger viruses were more heterogeneous, but most isolates reduced host populations by many orders of magnitude, without recovery over the ~ 25‐d experiments. Our results suggest that disparate lineages of viruses may have ecological consequences that are predictable in part based on size, and that ecosystem impacts of viral infection may vary with the size structure of the viral community.","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"656 1","pages":""},"PeriodicalIF":7.8,"publicationDate":"2025-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144515203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}