Limnology and Oceanography Letters最新文献

Concurrent global change and marine heatwaves disturb phototrophic more than heterotrophic protist diversity

IF 7.8 2区地球科学

Limnology and Oceanography Letters Pub Date : 2025-04-17 DOI: 10.1002/lol2.70017

Antonia Ahme, Inga Vanessa Kirstein, Cedric Leo Meunier, Sylke Wohlrab, Uwe John

{"title":"Concurrent global change and marine heatwaves disturb phototrophic more than heterotrophic protist diversity","authors":"Antonia Ahme, Inga Vanessa Kirstein, Cedric Leo Meunier, Sylke Wohlrab, Uwe John","doi":"10.1002/lol2.70017","DOIUrl":"https://doi.org/10.1002/lol2.70017","url":null,"abstract":"Anthropogenic pressures like ocean warming, acidification, rising N : P ratios, and marine heatwaves (MHWs) are affecting eukaryotic plankton diversity, though their combined impacts are rarely studied. To address this, we conducted a mesocosm experiment on a North Sea plankton community, testing the influence of a MHW under ambient and future environmental conditions. Using 18S rRNA amplicon sequencing, we found that global change generally reduced protist diversity, in particular that of phototrophic organisms. While heterotrophs were largely unaffected by heatwaves, phototrophic diversity declined especially during cooling and only recovered under ambient conditions. Global change shifted the community from nano‐ to pico‐sized phototrophs and increased harmful algae bloom species and parasites, while heatwaves elevated marine ochrophytes. The coccolithophore Gephyrocapsa oceanica thrived under both stressors. Our findings suggest that changing baseline conditions and extreme events can differentially impact heterotrophic and phototrophic diversity, with potential consequences for the metabolic balance of eukaryotic plankton communities.","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"41 1","pages":""},"PeriodicalIF":7.8,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143847239","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}

引用次数: 0

Brachiopods as archives of intrannual, annual, and interannual environmental variations

IF 7.8 2区地球科学

Limnology and Oceanography Letters Pub Date : 2025-04-16 DOI: 10.1002/lol2.70004

G. Crippa, H. Jurikova, M. J. Leng, M. Zanchi, E. M. Harper, J. W. B. Rae, K. Savickaite, M. Viaretti, L. Angiolini

{"title":"Brachiopods as archives of intrannual, annual, and interannual environmental variations","authors":"G. Crippa, H. Jurikova, M. J. Leng, M. Zanchi, E. M. Harper, J. W. B. Rae, K. Savickaite, M. Viaretti, L. Angiolini","doi":"10.1002/lol2.70004","DOIUrl":"https://doi.org/10.1002/lol2.70004","url":null,"abstract":"Brachiopods have been employed for environmental and climatic reconstructions in the near and geological past. Traditionally, one datapoint is obtained per shell, providing time‐averaged bulk signals. However, brachiopods also have the potential to provide time‐resolved information on (sub)annual timescales, but this has been understudied due to difficulties in accounting for brachiopod shell growth. We investigated the distribution of δ18O, δ13C and Element/Ca along growth profiles of three Recent terebratulides from temperate and polar latitudes. We employed a novel approach using the Brody–Bertalanffy equation to transform shell distances into ages, permitting the study of periodicity in the measured signatures. We show that, superimposed on ontogenetic trends, faster‐growing temperate species record annual and intrannual changes at collection sites, whereas slower‐growing Antarctic species are also controlled by endogenous cycles. δ18O profiles reflect annual and intrannual variations in midlatitudes and interannual variations at high latitudes. δ13C and Element/Ca are additionally influenced by vital effects.","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"59 1","pages":""},"PeriodicalIF":7.8,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143841796","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}

引用次数: 0

Impacts of riverine heatwaves on rates of ecosystem metabolism in the United States

IF 7.8 2区地球科学

Limnology and Oceanography Letters Pub Date : 2025-04-11 DOI: 10.1002/lol2.70014

Spencer J. Tassone, Michelle C. Kelly, Olivia N. Beidler, Michael L. Pace, Amy M. Marcarelli

引用次数: 0

Flocculation regulates suspended sediment transport in estuarine fronts

IF 7.8 2区地球科学

Limnology and Oceanography Letters Pub Date : 2025-04-11 DOI: 10.1002/lol2.70016

Leiping Ye, Jiayao Zhang, Jie Ren, Huan Liu, Jiaxue Wu

{"title":"Flocculation regulates suspended sediment transport in estuarine fronts","authors":"Leiping Ye, Jiayao Zhang, Jie Ren, Huan Liu, Jiaxue Wu","doi":"10.1002/lol2.70016","DOIUrl":"https://doi.org/10.1002/lol2.70016","url":null,"abstract":"This study examines suspended sediment transport affected by flocculation settling in a highly stratified tidal estuary. In situ observation recorded two estuarine front passages during strong‐ebb and flood‐slack tides, respectively. The strong‐ebb front enhanced turbulence, increasing sediment concentrations (~ 5 ppm), macrofloc size (~ 300 μm) and settling efficiency. The surface plume combined with middle layer together thickened from 1.5 to 2.5 m, facilitating particles mixing. The plankton and organic debris were transported into bottom water, forming fluffy, porous macroflocs. In contrast, the flood‐slack front developed stable middle barrier layer (~ 2 m) that restricted mixing and organic input, leading to denser, compact flocs (~ 150 μm) in bottom waters. Floc size distributions shifted from microfloc‐dominated to macrofloc‐dominated during strong‐ebb front passing, then returned to smaller, denser flocs. Dissolved‐oxygen changes due to sediment oxygen depletion varying. These findings help to improve predictive models for sediment transport and hypoxia dynamics in estuarine systems.","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"15 1","pages":""},"PeriodicalIF":7.8,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143822911","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}

引用次数: 0

Variable phenology but consistent loss of ice cover on 1213 Minnesota lakes

IF 7.8 2区地球科学

Limnology and Oceanography Letters Pub Date : 2025-04-09 DOI: 10.1002/lol2.70015

Jake R. Walsh, Christopher I. Rounds, Kelsey Vitense, Holly K. Masui, Kenneth A. Blumenfeld, Peter J. Boulay, Shyam M. Thomas, Andrew E. Honsey, Naomi S. Blinick, Claire L. Rude, Jonah A. Bacon, Ashley A. LaRoque, Tarciso C. C. Leão, Gretchen J. A. Hansen

引用次数: 0

Revisiting the distribution and total amount of nitrogen fixation across the Kuroshio 重新审视黑潮固氮作用的分布和总量

IF 7.8 2区地球科学

Limnology and Oceanography Letters Pub Date : 2025-04-08 DOI: 10.1002/lol2.70013

Takuya Sato, Takuhei Shiozaki, Shota Takino, Kiyotaka Hidaka, Tamaha Yamaguchi, Daiki Ito, Daisuke Ambe, Sayaka Sogawa, Takashi Setou, Yugo Shimizu, Taketoshi Kodama, Kazutaka Takahashi

引用次数: 0

Photooxidation removes biologically recalcitrant dissolved organic carbon released by the macroalga Sargassum natans 光氧化作用清除大型藻类马尾藻释放的生物难溶有机碳

IF 7.8 2区地球科学

Limnology and Oceanography Letters Pub Date : 2025-04-05 DOI: 10.1002/lol2.70011

Chance J. English, Rachel Parsons, Kevin Yongblah, Keri Opalk, Craig A. Carlson

引用次数: 0

A mangrove nitrous oxide sink attenuates methane climate impacts

IF 7.8 2区地球科学

Limnology and Oceanography Letters Pub Date : 2025-04-05 DOI: 10.1002/lol2.70007

Alex Cabral, Juliana Hayden, Bárbara Viana, Marcos de Almeida, Tiago Passos, Roberto Barcellos, Stefano Bonaglia, Vanessa Hatje, Isaac R. Santos

{"title":"A mangrove nitrous oxide sink attenuates methane climate impacts","authors":"Alex Cabral, Juliana Hayden, Bárbara Viana, Marcos de Almeida, Tiago Passos, Roberto Barcellos, Stefano Bonaglia, Vanessa Hatje, Isaac R. Santos","doi":"10.1002/lol2.70007","DOIUrl":"https://doi.org/10.1002/lol2.70007","url":null,"abstract":"We resolve mangrove nitrous oxide (N2O), methane (CH4), and carbon dioxide (CO2) vertical exchange with the atmosphere and lateral exchange with the ocean. Our new observations in Brazil were combined with literature data to reassess the overall mangrove carbon sequestration potential. The pristine mangrove creek was a source of CO2 and CH4, and a sink for N2O. The CO2‐equivalent N2O uptake offset up to 71% of local CH4 emissions. Global mangrove N2O sinks offset 34% of water–air CH4 emissions, potentially absorbing 0.6 Tg CO2 equivalents per year. Overlooking lateral exchange led to a large underestimation of mangrove N2O and CH4 fluxes. Previous observations in mangroves receiving nitrogen‐rich freshwater may have misattributed N2O sources. Pristine seawater‐dominated mangroves typically act as N2O sinks while those influenced by anthropogenic inputs are sources. Overall, the observed N2O sink further enhances the net climate benefit of mangroves.","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"22 1","pages":""},"PeriodicalIF":7.8,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143782513","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}

引用次数: 0

Eutrophication triggers diel and seasonal shifts of carbon dioxide and oxygen in tropical urban coastal waters

IF 7.8 2区地球科学

Limnology and Oceanography Letters Pub Date : 2025-04-04 DOI: 10.1002/lol2.70006

Tainan da Fonseca Fernandes, Roberta Bittencourt Peixoto, Luana Queiroz Pinho, Letícia Cotrim da Cunha, Thiago Veloso Franklin, Ricardo César Pollery, Vinícius Peruzzi de Oliveira, Leonardo Amora‐Nogueira, Humberto Marotta

{"title":"Eutrophication triggers diel and seasonal shifts of carbon dioxide and oxygen in tropical urban coastal waters","authors":"Tainan da Fonseca Fernandes, Roberta Bittencourt Peixoto, Luana Queiroz Pinho, Letícia Cotrim da Cunha, Thiago Veloso Franklin, Ricardo César Pollery, Vinícius Peruzzi de Oliveira, Leonardo Amora‐Nogueira, Humberto Marotta","doi":"10.1002/lol2.70006","DOIUrl":"https://doi.org/10.1002/lol2.70006","url":null,"abstract":"Coastal waters play a pivotal role in the global carbon cycle, showing increased short‐term variability of dissolved oxygen saturation (DOsat) and partial pressure of greenhouse gases like carbon dioxide (pCO2), especially in underrepresented tropical eutrophic environments. Here, we conducted high‐frequency (1‐min interval) diel measurements of surface DOsat and pCO2 in Guanabara Bay, Brazil, a highly nutrient‐enriched coastal ecosystem. The predominant metabolic controls on pCO2 were revealed by its strong negative correlation with DOsat. Air–sea CO2 fluxes derived from high‐frequency diel sampling showed emissions of 533 mmol C m−2 annually. Conventional estimates based on daylight‐only measurements were ~73% and 319% higher in the morning (10:00–12:00 h and sunrise–8:00 h, respectively) or ~172% and 244% lower in the afternoon (12:00–14:00 h and 14:00–16:00 h, respectively). Our findings indicate that rapid diel shifts between CO2 sinks and sources in eutrophic coastal waters can introduce significant uncertainty in estimating air–water CO2 fluxes from regional to global carbon budgets.","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"34 1","pages":""},"PeriodicalIF":7.8,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143782515","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}

引用次数: 0

Initiation of bivalve shell calcification under ocean acidification: integrating insights from shell to cell

IF 7.8 2区地球科学

Limnology and Oceanography Letters Pub Date : 2025-03-28 DOI: 10.1002/lol2.70010

Yang Xu, Fortunatus Masanja, Yuewen Deng, Yong Liu, Liqiang Zhao

{"title":"Initiation of bivalve shell calcification under ocean acidification: integrating insights from shell to cell","authors":"Yang Xu, Fortunatus Masanja, Yuewen Deng, Yong Liu, Liqiang Zhao","doi":"10.1002/lol2.70010","DOIUrl":"https://doi.org/10.1002/lol2.70010","url":null,"abstract":"The formation of initial bivalve shell is sensitive to ocean acidification, encoding the basis of shell formation and environmental information. Here, we demonstrated how the initial shell building processes were affected under various acidified conditions. With decreasing pH, larvae showed smaller shells and higher incidences of deformity. Shell elemental and isotopic profiles suggested that larvae almost exclusively used seawater dissolved inorganic carbon to calcify and exhibited diminished ability to maintain the calcifying fluid homeostasis. Compared to those reared at pHNBS 8.1, larvae exposed at pHNBS 7.7 downregulated the expression of genes related to transport of calcification substrates and regulation of carbonate chemistry, all of which were subsequently upregulated at pHNBS 7.4. This integrated finding advances the application of sclerochronology by providing insights into the initial shell formation, a crucial phase that is overlooked in sclerochronological studies, particularly in how environmental stressors affect the interpretation of geochemical proxies in adult shells.","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"36 1","pages":""},"PeriodicalIF":7.8,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143733892","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}

引用次数: 0