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Plant‐sediment interactions decouple inorganic from organic carbon stock development in salt marsh soils Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2024-03-09 Dirk Granse, Antonia Wanner, Martin Stock, Kai Jensen, Peter Mueller
The storage of organic carbon in the soils of salt marshes and other coastal blue carbon ecosystems has gained considerable attention by the scientific community for more than a decade now, while the relevance and mechanisms of soil inorganic carbon accumulation remain poorly understood. Using long‐term annual accretion monitoring over 17 years in N = 50 permanent plots distributed across a 1050‐ha
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Particulate organic carbon sedimentation triggers lagged methane emissions in a eutrophic reservoir Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2024-03-09 Andrés Martínez‐García, Ignacio Peralta‐Maraver, Eva Rodríguez‐Velasco, Gema L. Batanero, Miriam García‐Alguacil, Félix Picazo, Juan Calvo, Rafael Morales‐Baquero, Francisco J. Rueda, Isabel Reche
Reservoirs act as carbon sinks when sedimentation of particulate organic carbon (POC) exceeds CO2 and CH4 emissions. Here, we study the poorly explored process where phytoplankton‐derived acidic polysaccharides (APs) aggregate into particulate organic matter, promoting carbon export to sediments. This source of POC in sediments can mineralize to CO2 and CH4 over various timescales. Our research, centered
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Dissolved organic matter offsets the detrimental effects of climate change in the nitrogen‐fixing cyanobacterium Crocosphaera Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2024-03-05 Alba Filella, Jacqueline Umbricht, Angelina Klett, Angela Vogts, Thomas Vannier, Olivier Grosso, Maren Voss, Lasse Riemann, Mar Benavides
Diazotrophs provide a significant reactive nitrogen source in the ocean. Increased warming and stratification may decrease nutrient availability in the future, forcing microbial communities toward using dissolved organic matter (DOM). Not depending on reactive nitrogen availability, diazotrophs may be “winners” in a nutrient‐depleted ocean. However, their ability to exploit DOM may influence this success
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Lagging spawning and increasing phenological extremes jeopardize walleye (Sander vitreus) in north‐temperate lakes Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2024-02-26 Martha E. Barta, Greg G. Sass, Jeffrey R. Reed, Thomas A. Cichosz, Aaron D. Shultz, Mark Luehring, Zachary S. Feiner
The phenology of critical biological events in aquatic ecosystems is rapidly shifting due to climate change. Growing variability in phenological cues can increase the likelihood of trophic mismatches (i.e., mismatches in the timing of peak prey and predator abundances), causing recruitment failures in important fisheries. We assessed changes in the spawning phenology of walleye (Sander vitreus) in
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Sea-ice loss accelerates carbon cycling and enhances seasonal extremes of acidification in the Arctic Chukchi Sea Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2024-02-05 Yixing Zhang, Yingxu Wu, Wei-Jun Cai, Xiangqi Yi, Xiang Gao, Haibo Bi, Yanpei Zhuang, Liqi Chen, Di Qi
The Chukchi Sea shelf (CSS) is a highly productive region in the Arctic Ocean and it is highly efficient for absorbing atmospheric carbon dioxide and exporting and retaining carbon in the deep sea. However, with global warming, the carbon retention time in CSS may decrease, leading to less efficient carbon export. Here, we investigate the seasonal variability of carbonate chemistry in CSS using three
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Biotic and thermal drivers alter zooplankton phenology in western Lake Erie Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2024-02-02 Jenna Bailey, James M. Hood
Environmental change, particularly warming and eutrophication, can alter phenology in aquatic systems. Understanding controls on zooplankton phenology is important due to their central role in food webs. While patterns in zooplankton phenology have been well documented, we lack an understanding of how abiotic and biotic drivers influence lake zooplankton phenology during the summer. We examined the
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Enhanced stream greenhouse gas emissions at night and during flood events Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2024-01-28 Rebecca L. Woodrow, Shane A. White, Stephen R. Conrad, Praktan D. Wadnerkar, Gerard Rocher-Ros, Christian J. Sanders, Ceylena J. Holloway, Isaac R. Santos
Headwater streams play a large role in aquatic greenhouse gas emissions. Carbon dioxide (CO2) and dissolved oxygen in streams often undergo changes through diel cycles. However, methane (CH4) and nitrous oxide (N2O) have unknown diel dynamics. Here, we reveal consistent patterns in CO2, CH4, and N2O over diel cycles and during flood events using high-frequency continuous observations in a subtropical
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Mesocosm experiments validate induction of Daphnia vertical migration by the fish-derived kairomone 5α-cyprinol sulfate Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2024-01-26 Johanna Ahlers, Meike Hahn, Maria Stockenreiter, Herwig Stibor, Eric von Elert
The fish-derived bile salt 5α-cyprinol sulfate (CPS) has been identified as a kairomone inducing the predator avoidance behavior “diel vertical migration” (DVM) in Daphnia magna in response to fish. However, conclusions about the ecological significance of CPS have been derived from laboratory experiments only. Using a mesocosm approach, we investigate whether the role of CPS as a kairomone can be
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How to write lay summaries of research articles for wider accessibility Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2024-01-16 Laura J. Falkenberg, Patrick W. S. Joyce, Patricia A. Soranno
Scientific Significance Statement Scientific writing can be hard for nonspecialists to understand. Journals are trying to make findings more accessible by asking authors to write “lay summaries.” These texts are intended to be more widely understood than abstracts. We show, however, that they are not more accessible due to high jargon and low readability scores of the writing. We offer tips to authors
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Establishing fluvial silicon regimes and their stability across the Northern Hemisphere Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2024-01-13 Keira Johnson, Kathi Jo Jankowski, Joanna Carey, Nicholas J. Lyon, William H. McDowell, Arial Shogren, Adam Wymore, Lienne Sethna, Wilfred M. Wollheim, Amanda E. Poste, Pirkko Kortelainen, Ruth Heindel, Hjalmar Laudon, Antti Räike, Jeremy B. Jones, Diane McKnight, Paul Julian, Sidney Bush, Pamela L. Sullivan
Fluvial silicon (Si) plays a critical role in controlling primary production, water quality, and carbon sequestration through supporting freshwater and marine diatom communities. Geological, biogeochemical, and hydrological processes, as well as climate and land use, dictate the amount of Si exported by streams. Understanding Si regimes—the seasonal patterns of Si concentrations—can help identify processes
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Characterization of a Southern Ocean deep chlorophyll maximum: Response of phytoplankton to light, iron, and manganese enrichment Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-12-27 Pauline Latour, Sam Eggins, Pier van der Merwe, Lennart T. Bach, Philip W. Boyd, Michael J. Ellwood, Andrew R. Bowie, Kathrin Wuttig, Robert F. Strzepek
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Ice-melt period dominates annual carbon dioxide evasion from clear-water Arctic lakes Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-12-18 J. Karlsson, H. A. Verheijen, D. A. Seekell, D. Vachon, M. Klaus
Current estimates of carbon dioxide (CO2) evasion from Arctic lakes are highly uncertain because few studies integrate seasonal variability, specifically evasion during spring ice-melt. We quantified annual CO2 evasion for 14 clear-water Arctic lakes in Northern Sweden through mass balance (ice-melt period) and high-frequency loggers (open-water period). On average, 80% (SD: ± 18) of annual CO2 evasion
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Shedding light on cobalamin photodegradation in the ocean Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-12-14 Catherine C. Bannon, Elizabeth M. Mudge, Erin M. Bertrand
Cobalamin, vitamin B12, is an important micronutrient that has been investigated for decades in the marine context because it is required for phytoplankton growth. The biologically active forms (Me-B12, Ado-B12) and the synthetic form (CN-B12) quickly convert to OH-B12 after light exposure in various aqueous solutions, but puzzlingly have been frequently reported to dominate dissolved cobalamin pools
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Persistent hot spots of CO2 and CH4 in coastal nearshore environments Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-12-13 Eero Asmala, Matias Scheinin
Nearshore environments are typically supersaturated with the potent greenhouse gases methane and carbon dioxide, due to intense remineralization of the elevated supply of organic carbon in these systems. These environments are characterized by overlapping biogeochemical gradients and heterogeneous morphology, and the overall spatial variability in nearshore greenhouse gas concentrations remains unclear
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A new metric for sunlight exposure in rivers, lakes, and oceans Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-11-22 John R. Gardner, Martin W. Doyle, Scott H. Ensign, David M. Kahler
Vertical motion is an important driver of sunlight exposure in aquatic environments, shaping the growth and fate of materials and organisms. We derive a simple model accounting for turbulent depth fluctuations of particles to predict the depth that contributes the most sunlight exposure (effective depth) as well as the single depth that, if measured at one place over time, produces the same total sunlight
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Salinization, warming, and loss of water clarity inhibit vertical mixing of small urban ponds Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-11-16 Charlie J.G. Loewen, Donald A. Jackson
Urbanization drives multiple environmental changes that influence critical ecosystem processes. Factors such as salinization by deicing road salts, reduced water clarity (and greater light attenuation) from eutrophication and sediment loading, and warming constrain not only the biodiversity of ponds, but also their physical mixing (with consequences for oxygen availability and the provision of ecosystem
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Increased anoxia following species invasion of a eutrophic lake Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-11-14 Robin R. Rohwer, Robert Ladwig, Paul C. Hanson, Jake R. Walsh, M. Jake Vander Zanden, Hilary A. Dugan
Species invasions can disrupt aquatic ecosystems by re-wiring food webs. A trophic cascade triggered by the invasion of the predatory zooplankter spiny water flea (Bythotrephes cederströmii) resulted in increased phytoplankton due to decreased zooplankton grazing. Here, we show that increased phytoplankton biomass led to an increase in lake anoxia. The temporal and spatial extent of anoxia experienced
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Warming-induced changes in benthic redox as a potential driver of increasing benthic algal blooms in high-elevation lakes Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-10-31 Stephanie E. Hampton, Jill S. Baron, Robert Ladwig, Ryan P. McClure, Michael F. Meyer, Isabella A. Oleksy, Anna Shampain
Scientific Significance Statement Algal blooms appear to be increasing on benthic substrates of naturally nutrient-poor lakes worldwide, yet common drivers across these systems remain elusive. The phenomenon has been notable in high-elevation mountain lakes, which is enigmatic given their relative remoteness from human disturbance. We suggest that warming-induced changes in redox conditions that promote
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Significant benthic fluxes of bioavailable dissolved amino acids to the ocean: Results from the East/Japan Sea Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-10-26 Hyekyung Park, Guebuem Kim, Sung-Han Kim, Jae Seong Lee
We measured dissolved organic carbon (DOC) and total dissolved amino acid (TDAA) in seawater and sediment porewater of the Ulleung Basin in the East/Japan Sea. The DOC and TDAA concentrations were 1.1- and 1.4-fold higher in the euphotic zone, and 11- and 43-fold higher in sediment porewater, respectively, than those in the deep ocean. Consequently, in the deep ocean, TDAA and DOC input fluxes from
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Hydrology, rather than wildfire burn extent, determines post-fire organic and black carbon export from mountain rivers in central coastal California Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-10-18 Riley Barton, Christina M. Richardson, Evelyn Pae, Maya S. Montalvo, Michael Redmond, Margaret A. Zimmer, Sasha Wagner
Coastal mountain rivers export disproportionately high quantities of terrestrial organic carbon (OC) directly to the ocean, feeding microbial communities and altering coastal ecology. To better predict and mitigate the effects of wildfires on aquatic ecosystems and resources, we must evaluate the relationships between fire, hydrology, and carbon export, particularly in the fire-prone western United
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Acoustic twilight: A year-long seafloor monitoring unveils phenological patterns in the abyssal soundscape Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-10-17 Tzu-Hao Lin, Shinsuke Kawagucci
Despite the perpetual darkness of the deep sea, contrasting the sunlit epipelagic waters, many deep-sea organisms exhibit rhythmic activities. To discern environmental cues that may serve as entrainment signals for deep-sea organisms, this study investigated the soundscape of the abyssal plain south of Minamitorishima Island. Our analysis revealed clear diel and seasonal patterns, primarily driven
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Relative importance of bacterivorous mixotrophs in an estuary-coast environment Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-10-14 Qian Li, Kaiyi Dong, Ying Wang, Kyle F. Edwards
Mixotrophic eukaryotes are important bacterivores in oligotrophic open oceans, but their significance as grazers in more nutrient-rich waters is less clear. Here, we investigated the bacterivory partition between mixotrophs and heterotrophs in a productive, estuary-influenced coastal region in the East China Sea. We found ubiquitous, actively feeding phytoplankton populations and taxa with mixotrophic
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Direct contribution of invertebrate holobionts to methane release from coastal sediments Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-10-07 Tobia Politi, Mindaugas Zilius, Marco Bartoli, Ulisse Cardini, Ugo Marzocchi, Stefano Bonaglia
Sediment macrofauna play a vital role in sustaining aquatic food webs and biogeochemical cycles. Previous research demonstrated that bioturbation indirectly affects methane (CH4) dynamics through mobilization of porewater and alteration of microbial processes in the surrounding sediment. However, little is known on the direct contribution of macrofauna holobionts (the assemblage of invertebrate host
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Sustained upward groundwater discharge through salt marsh tidal creeks Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-10-03 Lucheng Zhan, Pei Xin, Jiansheng Chen, Xiaogang Chen, Ling Li
Salt marshes can export considerable nutrients and carbon to the ocean through submarine groundwater discharge (SGD). However, the complicated SGD processes in salt marshes remain poorly understood. Here, we first report the phenomenon of numerous highly saline artesian springs found in a salt marsh system of East China. Multiple methods including time-series thermal monitoring, isotope signatures
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How low can you go? Widespread challenges in measuring low stream discharge and a path forward Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-09-30 Erin C. Seybold, Anna Bergstrom, C. Nathan Jones, Amy J. Burgin, Sam Zipper, Sarah E. Godsey, Walter K. Dodds, Margaret A. Zimmer, Margaret Shanafield, Thibault Datry, Raphael D. Mazor, Mathis L. Messager, Julian D. Olden, Adam Ward, Songyan Yu, Kendra E. Kaiser, Arial Shogren, Richard H. Walker
Scientific Significance Statement Low flows pose unique challenges for accurately quantifying streamflow. Current field methods are not optimized to measure these conditions, which in turn, limits research and management. In this essay, we argue that the lack of methods for measuring low streamflow is a fundamental challenge that must be addressed to ensure sustainable water management now and into
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Decoupled growth and grazing rates of diatoms and green algae drive increased phytoplankton productivity on HNLC sub-Antarctic plateaux Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-09-13 Andres Gutiérrez-Rodríguez, Mikel Latasa, Karl Safi, Matthew H. Pinkerton, Scott D. Nodder
The combination of iron limitation and microzooplankton grazing controls phytoplankton productivity and taxonomic composition in high-nutrient low-chlorophyll (HNLC) regions. While increased productivity and diatom contribution triggered by iron enrichment support this view, direct measurements of underpinning group-specific growth and grazing rates are scarce for the Southern Ocean. To assess these
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Phytoplankton as indicators of global warming? Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-09-08 James E. Cloern, Tara S. Schraga, Erica Nejad, Taylor Eddy
Terrestrial plants are sensitive indicators of global warming because their annual cycles of growth and senescence are changing as warming proceeds. Single celled algae are distinct life forms capable of population bursts in any season, so there is uncertainty about phytoplankton phenology as a comparable indicator of global warming. We analyzed 4+ decades of monthly chlorophyll a measurements at two
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Why should I submit my article to a scientific-society journal? Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-09-08 James Cloern
Scientific publishing is a business enterprise that publishes journals following a diversity of models including those where: (1) journals are owned and published by a publishing company that retains revenues and (2) those published by a partnership between a publishing company and a scientific society where revenues are shared. Authors choose where to submit their articles from over 40,000 peer-reviewed
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Diazotrophy in the Indian Ocean: Current understanding and future perspectives Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-09-01 Subhadeep Chowdhury, Eric Raes, Cora Hörstmann, Ayaz Ahmed, Céline Ridame, Nicolas Metzl, P S Bhavya, Takuya Sato, Takuhei Shiozaki, Sophie Bonnet, Carolin R. Löscher, Arvind Singh, Mar Benavides
Dinitrogen (N2) fixation provides the major source of reactive nitrogen in the open ocean, sustaining biological productivity. The Indian Ocean (IO) covers 22% of the ocean surface, while it only represents 1% of the global diazotroph database. Hence, constraining the sources of nitrogen in the IO is crucial. Here, we compile three decades of N2 fixation and diazotroph DNA data in the IO. Our analysis
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Seagrass spatial data synthesis from north-east Australia, Torres Strait and Gulf of Carpentaria, 1983 to 2022 Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-08-23 A Carter, S McKenna, MA Rasheed, H Taylor, C van de Wetering, K Chartrand, C Reason, C Collier, L Shepherd, J Mellors, L McKenzie, NC Duke, A Roelofs, N Smit, R Groom, D Barrett, S Evans, R Pitcher, N Murphy, M Carlisle, M David, S Lui, , RG Coles
The Gulf of Carpentaria and Torres Strait in north-eastern Australia support globally significant seagrass ecosystems that underpin fishing and cultural heritage of the region. Reliable data on seagrass distribution are critical to understanding how these ecosystems are changing, while managing for resilience. Spatial data on seagrass have been collected since the early 1980s, but the early data were
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High rates of carbon burial linked to autochthonous production in artificial ponds Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-08-18 Meredith A. Holgerson, Nicholas E. Ray, Chelsea Russ
Ponds are globally abundant and important to the global carbon cycle. Although ponds have large greenhouse gas emissions, they also sequester carbon in their sediments. Here, we studied organic carbon (OC) burial rates in 22 temperate experimental ponds with negligible watersheds, where carbon sequestration derives solely from autochthonous primary production. The ponds were built identically in 1964
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A global review of pyrosomes: Shedding light on the ocean's elusive gelatinous “fire-bodies” Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-08-18 Laura E. Lilly, Iain M. Suthers, Jason D. Everett, Anthony J. Richardson
Pyrosomes are colonial tunicates that form gelatinous tubes and occasionally produce bioluminescent swarms. The rapid “bloom-bust” dynamics of pyrosomes have the potential to outcompete other zooplankton, restructure marine food webs, enhance carbon export, and interfere with human activities. Pyrosomes have been recorded for at least two centuries, yet much remains unknown about their physiology,
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Coastal marine megaripple fields are metabolic hotspots with highly dynamic oxygen exchange Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-08-08 Peter Berg, Markus Huettel
Megaripples are current-generated seafloor bedforms of well-sorted sand or gravel and wavelengths over 1 m. In this aquatic eddy covariance study, we measured large rates of benthic primary production and respiration for a shallow-water sandy megaripple field exposed to strong tidally driven currents and intense sunlight. Current and light were the main short-term drivers of a highly dynamic oxygen
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Thermal regimes of groundwater- and lake-fed headwater streams differ in their response to climate variability Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-08-07 Danielle T. Hudson, Jason A. Leach, Daniel Houle
Stream thermal regimes are being altered by climate change with consequences for aquatic organisms. Most documented long-term changes in stream temperature are from large rivers. We know less about water temperature trends for small headwater streams, especially those found in northern landscapes that contain small lakes. We analyzed 36 yr of stream temperature observations from a long-term watershed
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Validity of the Landsat surface reflectance archive for aquatic science: Implications for cloud-based analysis Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-08-06 Daniel Andrade Maciel, Nima Pahlevan, Claudio Clemente Faria Barbosa, Evlyn Márcia Leão de Moraes de Novo, Rejane Souza Paulino, Vitor Souza Martins, Eric Vermote, Christopher J. Crawford
Originally developed for terrestrial science and applications, the US Geological Survey Landsat surface reflectance (SR) archive spanning ~ 40 yr of observations has been increasingly utilized in large-scale water-quality studies. These products, however, have not been rigorously validated using in situ measured reflectance. This letter quantifies and demonstrates the quality of the SR products by
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Spatially varying plankton synchrony patterns at seasonal and interannual scales in a well-connected shelf sea Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-08-04 Isabel A. Honda, Rubao Ji, Andrew R. Solow
Spatial population synchrony, defined as spatial covariation in population density fluctuations, exists across different temporal and spatial scales. Determining the degree of spatial synchrony is useful for inferring environmental drivers of population variability in the wake of climate change. In this study, we applied novel statistical methods to detect spatial synchrony patterns of Calanus finmarchicus
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Physical controls and ecological implications of the timing of the spring phytoplankton bloom on the Newfoundland and Labrador shelf Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-07-26 Frédéric Cyr, Keith Lewis, David Bélanger, Paul Regular, Stephanie Clay, Emmanuel Devred
The timing of spring phytoplankton blooms is crucial to many species that have adapted their development to benefit from the enhanced feeding opportunity they offer. Any change to their timing may affect the productivity of an entire ecosystem. This study explores the relationship between the ocean climate, the timing of the spring bloom and the secondary production on the Newfoundland and Labrador
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Upper limits for road salt pollution in lakes Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-07-25 Christopher T. Solomon, Hilary A. Dugan, William D. Hintz, Stuart E. Jones
Widespread and increasing use of road deicing salt is a major driver of increasing lake chloride concentrations, which can negatively impact aquatic organisms and ecosystems. We used a simple model to explore the controls on road salt concentrations and predict equilibrium concentrations in lakes across the contiguous United States. The model suggests that equilibrium salt concentration depends on
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An integrative salt marsh conceptual framework for global comparisons Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-07-15 Erik S. Yando, Scott F. Jones, W. Ryan James, Denise D. Colombano, Diana I. Montemayor, Stefanie Nolte, Jacqueline L. Raw, Shelby L. Ziegler, Luzhen Chen, Daniele Daffonchio, Marco Fusi, Kerrylee Rogers, Liudmila Sergienko
Salt marshes occur globally across climatic and coastal settings, providing key linkages between terrestrial and marine ecosystems. However, salt marsh science lacks a unifying conceptual framework; consequently, historically well-studied locations have been used as normative benchmarks. To allow for more effective comparisons across the diversity of salt marshes, we developed an integrative salt marsh
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Depth profiles of Jerlov water types Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-07-11 Craig A. Williamson, Richard C. Hollins
Typical depth profiles of Jerlov water types have been derived to characterize the clarity of the world's oceans. Measured values of the downwelling diffuse attenuation coefficient, taken from a world-wide database, were quantitatively analyzed. Depth profiles were extracted from more than 2500 data collection campaigns, consisting of the closest-matching Jerlov water types at the uppermost layer (0–10 m)
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Global Ocean dimethylsulfide photolysis rates quantified with a spectrally and vertically resolved model Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-07-04 Martí Galí, Emmanuel Devred, Gonzalo L. Pérez, David J. Kieber, Rafel Simó
Photochemical reactions initiated by ultraviolet radiation remove the climate-active gas dimethylsulfide (DMS) from the ocean's surface layer. Here, we quantified DMS photolysis using a satellite-based model that accounts for spectral irradiance attenuation in the water column, its absorption by chromophoric dissolved organic matter, and the apparent quantum yields (AQYs) with which absorbed photons
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Coral growth persistence amidst bleaching events Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-06-29 Hanna C. Mantanona, Thomas M. DeCarlo
As mass bleaching events decimate stony coral populations, production of calcium carbonate is diminished on reefs, dampening their capacity to keep pace with rising sea levels. However, perturbations to the calcification process of surviving wild corals during bleaching are poorly constrained, owing to the lack of suitable techniques to retroactively extract this information from coral skeletons at
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CDOM spectral slope (S275–295) as tracers of water masses, CDOM heterogeneity, and Δ14C-DOC in an oligotrophic marginal sea Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-06-28 Guisheng Song, Fangming Yang, Philippe Massicotte, Hao Wei, Huixiang Xie
The absorption spectral slope, S275–295, is an optical metric frequently employed for characterizing chromophoric dissolved organic matter (CDOM). We collected CDOM absorption (aCDOM) and fluorescence spectra from the oligotrophic offshore South China Sea to identify the major determinant of S275–295 and to explore the potential of S275–295 as physical and biogeochemical tracers. S275–295 linearly
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Environmental adaptations by the intertidal Antarctic cyanobacterium Halotia branconii CENA392 as revealed using long-read genome sequencing Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-06-20 Rafael B. Dextro, Endrews Delbaje, Paloma N. N. Freitas, Vanessa Geraldes, Ernani Pinto, Paul F. Long, Marli F. Fiore
Antarctica poses numerous challenges to life such as cold shock, low nutrient concentrations, and periodic desiccation over a wide range of extreme temperatures. Cyanobacteria survive this harsh environment having evolved adaptive metabolic plasticity to become the dominant primary producers. The type strain cyanobacterium Halotia branconii CENA392 was isolated from an Antarctic intertidal seashore
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Establishing a long-term citizen science project? Lessons learned from the Community Lake Ice Collaboration spanning over 30 yr and 1000 lakes Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-06-17 Lianna S. Lopez, Aman Basu, Kevin Blagrave, Gerald Bove, Kenton Stewart, Dawn Bazely, Sapna Sharma
Recruiting the public to participate in the scientific process can be invaluable in furthering our understanding of global environmental change. Several long-term citizen science projects have been active for over a decade, with most involving the public in the data collection phase of the scientific process. Our team has recently inherited a long-term citizen science project called the Community Lake
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Integrating ocean observations across body-size classes to deliver benthic invertebrate abundance and distribution information Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-05-31 Henry A. Ruhl, Brian J. Bett, Jeroen Ingels, Adrian Martin, Andrew R. Gates, Andrew Yool, Noëlie M.A. Benoist, Ward Appeltans, Kerry L. Howell, Roberto Danovaro
Invertebrate animals living at the seafloor make up a prominent component of life globally, spanning 10 orders of magnitude in body size over 71% of Earth's surface. However, integrating information across sizes and sampling methodologies has limited our understanding of the influence of natural variation, climate change and human activity. Here, we outline maturing practices that can underpin both
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Sulfate enrichment in estuaries of the northwestern Gulf of Mexico: The potential effect of sulfide oxidation on carbonate chemistry under a changing climate Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-05-30 Hang Yin, Xinping Hu, Larissa M. Dias
Water quality parameters from 2000 to 2020 were used to identify the spatial and temporal sulfate variations in estuaries of the northwestern Gulf of Mexico. Sulfate enrichment relative to conservative mixing was found to be associated with a low river discharge period from 2012 to 2014 in all estuaries. Based on reaction stoichiometry, sedimentary sulfide oxidation holds significant potential for
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Coastal acidification alters estuarine sediment nitrous oxide and methane fluxes Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-05-24 Claudia I. Mazur, Robinson W. Fulweiler
The impact of coastal acidification on sediment nitrous oxide (N2O) and methane (CH4) fluxes is largely unknown. We exposed temperate estuarine sediments to moderate (pH 7.3) and extreme (pH 6.3) acidification. Sediments were collected from two sites—one exposed to high and the other to low nitrogen loading. We demonstrate that low pH has a strong effect on greenhouse gas fluxes. The response, in terms
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Variation in fatty acid content among benthic invertebrates in a seasonally driven system Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-05-22 Per Hedberg, Danny C. P. Lau, Séréna Albert, Monika Winder
At temperate latitudes where seasonal changing environmental conditions strongly affect the magnitude, duration and species composition of pelagic primary production, macrobenthic organisms living below the photic zone rely on the sedimentation of organic matter as their primary energy source. The succession from nutritious spring blooms to summer cyanobacteria is assumed to reduce food quality for
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Temperature regulates Synechococcus population dynamics seasonally and across the continental shelf Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-05-12 Bethany L. F. Stevens, E. Taylor Crockford, Emily E. Peacock, Michael G. Neubert, Heidi M. Sosik
Hourly, year-round flow cytometry has made it possible to relate seasonal environmental variability to the population dynamics of the smallest, most abundant phytoplankton on the Northeast US Shelf. To evaluate whether the insights from these data extend to Synechococcus farther from shore, we analyze flow cytometry measurements made continuously from the underway systems on 21 cruises traveling between
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Toward a consensus framework to evaluate air–sea CO2 equilibration for marine CO2 removal Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-05-10 Lennart T. Bach, David T. Ho, Philip W. Boyd, Michael D. Tyka
Scientific Significance Statement Atmospheric carbon dioxide removal (CDR) is considered an essential component of climate change mitigation—as a supplement to emission reductions. Marine CDR methods have the potential to provide gigatonne-scale CDR but they differ from terrestrial methods in that they first reduce CO2 in seawater to ultimately increase the net flux of CO2 from the atmosphere to the
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Biogeochemical-Argo floats show that chlorophyll increases before carbon in the high-latitude Southern Ocean spring bloom Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-05-04 Clara R. Vives, Christina Schallenberg, Peter G. Strutton, Philip W. Boyd
In the Southern Ocean, phytoplankton blooms are an annually recurring prominent feature that play a significant role in ocean CO2 uptake. Understanding the timing of the phytoplankton bloom is necessary to provide insights into the underlying physiological drivers, for the study of ecosystem dynamics and consequent patterns in downward carbon export. Previous studies have used chlorophyll (chl) and
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MacroSheds: A synthesis of long-term biogeochemical, hydroclimatic, and geospatial data from small watershed ecosystem studies Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-04-26 Michael J. Vlah, Spencer Rhea, Emily S. Bernhardt, Weston Slaughter, Nick Gubbins, Amanda G. DelVecchia, Audrey Thellman, Matthew R. V. Ross
The US Federal Government supports hundreds of watershed monitoring efforts from which solute fluxes can be calculated. Although instrumentation and methods vary between studies, the data collected and their motivating questions are remarkably similar. Nevertheless, little effort toward their compilation has previously been made. The MacroSheds project has developed a future-friendly system for harmonizing
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Ocean acidification has a strong effect on communities living on plastic in mesocosms Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-04-21 Xu Zhang, Ping Zhang, Zichao Deng, Ruiping Huang, Di Zhang, Yang Tian, Na Wang, He Li, Xuyang Wang, Xiaowen Jiang, Jiazhen Sun, Qianqian Fu, Xiangqi Yi, Liming Qu, Cong Zhou, Yuming Rao, Xiaorong Zeng, Jason M. Hall-Spencer, Guang Gao, Kunshan Gao, Xin Lin
We conducted a mesocosm experiment to examine how ocean acidification (OA) affects communities of prokaryotes and eukaryotes growing on single-use drinking bottles in subtropical eutrophic waters of the East China Sea. Based on 16S rDNA gene sequencing, simulated high CO2 significantly altered the prokaryotic community, with the relative abundance of the phylum Planctomycetota increasing by 49%. Under
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Synchronous variation of dissolved organic carbon in Adirondack lakes at multiple timescales Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-04-19 Jonathan A. Walter, Nat J. Coombs, Michael L. Pace
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A rationale for higher ratios of CH4 to CO2 production in warmer anoxic freshwater sediments and soils Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-04-17 Yizhu Zhu, Kevin J Purdy, Ana Martínez Rodríguez, Mark Trimmer
Scientific Significance Statement Freshwaters emit significant amounts of CH4 and CO2 and, as CH4 is the stronger greenhouse gas, understanding how carbon gets mineralized to either gas is important. In theory, under anoxia, methanogenesis coupled to fermentation should produce CH4 and CO2 in a 1 : 1 ratio. Here, we find that this 1 : 1 ratio is rare, with lower ratios of 0.1 : 1 being typical which
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Exploring the mismatch between the theory and application of photosynthetic quotients in aquatic ecosystems Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-04-13 Matt T. Trentman, Robert O. Hall, H. Maurice Valett
Estimates of primary productivity in aquatic ecosystems are commonly based on variation in O 2 , rather than CO 2 . The photosynthetic quotient (PQ) is used to convert primary production estimates from units of O 2 to C. However, there is a mismatch between the theory and application of the PQ. Aquatic ecologists use PQ = 1–1.4. Meanwhile, PQ estimates from the literature support PQ = 0.1–4.2. Here
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Some considerations of measuring temperature sensitivity in thermal ecology Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-03-21 Kyle B. Heine
Scientific Significance Statement Climate change is driving a need to understand how changing temperatures affect organism physiology, including whole-organism metabolic rate. This process is sometimes quantified using Q10 values, or temperature coefficients. Although intuitive at first glance, Q10 values are limited to measuring effects at two temperatures, must be assessed with similar Q10 values
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Anaerobic duration predicts biogeochemical consequences of oxygen depletion in lakes Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-03-21 Richard LaBrie, Michael Hupfer, Maximilian P. Lau
Lake deoxygenation is of growing concern because it threatens ecosystem services delivery. Complete deoxygenation, anoxia, is projected to prolong and expand in lakes, promoting the production or release of nutrients, greenhouse gases and metals from the water column and sediments. Accumulation of these compounds cannot be easily predicted thus hindering our capacity to forecast the ecological consequences
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Nonlinear water clarity trends and impacts on littoral area in Minnesota lakes Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-03-17 Kelsey Vitense, Gretchen J. A. Hansen
Lake water clarity is an indicator of water quality, trophic status, and habitat condition. Changes in clarity impact lake ecosystems and may reflect land use changes or presence of invasive species. Quantifying temporal changes in water clarity can be challenging because clarity varies seasonally, annually, and spatially within and among lakes. We developed a hierarchical generalized additive model