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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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Why should I submit my article to a scientific-society journal? Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-09-08 James E. 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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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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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
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How many independent quantities can be extracted from ocean color? Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-03-14 B. B. Cael, Kelsey Bisson, Emmanuel Boss, Zachary K. Erickson
Products derived from remote sensing reflectances ( R rs λ ), for example, chlorophyll, phytoplankton carbon, euphotic depth, or particle size, are widely used in oceanography. Problematically, R rs λ may have fewer degrees of freedom (DoF) than measured wavebands or derived products. Here, we show that a global sea surface hyperspectral R rs λ dataset has DoF = 4. MODIS-like multispectral equivalent
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Tracking freshwater browning and coastal water darkening from boreal forests to the Arctic Ocean Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-03-13 Anders Frugård Opdal, Tom Andersen, Dag O. Hessen, Christian Lindemann, Dag L. Aksnes
The forest cover of Northern Europe has been steadily expanding during the last 120 years. More terrestrial vegetation and carbon fixation leads to more export to surface waters. This may cause freshwater browning, as more degraded plant-litter ends up as chromophoric (colored) dissolved organic matter. Although most freshwater ultimately drains to coastal waters, the link between freshwater browning
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Widespread synchrony in phosphorus concentrations in northern lakes linked to winter temperature and summer precipitation Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-03-03 Peter D. F. Isles, Irena F. Creed, Dag O. Hessen, Pirkko Kortelainen, Michael Paterson, Francesco Pomati, James A. Rusak, Jussi Vuorenmaa, Ann-Kristin Bergström
In recent years, unexplained declines in lake total phosphorus (TP) concentrations have been observed at northern latitudes (> 42°N latitude) where most of the world's lakes are found. We compiled data from 389 lakes in Fennoscandia and eastern North America to investigate the effects of climate on lake TP concentrations. Synchrony in year-to-year variability is an indicator of climatic influences
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Rapid phytoplankton response to wind forcing influences productivity in upwelling bays Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-03-03 Esperanza Broullón, Peter J. S. Franks, Bieito Fernández Castro, Miguel Gilcoto, Antonio Fuentes-Lema, Maria Pérez-Lorenzo, Emilio Fernández, Beatriz Mouriño-Carballido
Bays are often ecological hotspots within highly-productive eastern boundary upwelling systems. Though the physics of such bays are well understood, there is no consensus about the factors underlying their high productivity. Three weeks of high-temporal-resolution observations in two long, narrow bays (Rías Baixas, NW-Iberia), showed that during an upwelling pulse, deep, nutrient-rich isopycnals rose
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Contrasting impacts of warming and browning on periphyton Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-02-27 Isolde Callisto Puts, Jenny Ask, Maria Myrstener, Ann-Kristin Bergström
We tested interactive effects of warming (+2°C) and browning on periphyton accrual and pigment composition when grown on a synthetic substrate (plastic strips) in the euphotic zone of 16 experimental ponds. We found that increased colored dissolved organic matter (cDOM) and associated nutrients alone, or in combination with warming, resulted in a substantially enhanced biomass accrual of periphyton
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Blooms also like it cold Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-02-17 Kaitlin L. Reinl, Ted D. Harris, Rebecca L. North, Pablo Almela, Stella A. Berger, Mina Bizic, Sarah H. Burnet, Hans-Peter Grossart, Bastiaan W Ibelings, Ellinor Jakobsson, Lesley B. Knoll, Brenda M. Lafrancois, Yvonne McElarney, Ana M. Morales-Williams, Ulrike Obertegger, Igor Ogashawara, Ma Cristina Paule-Mercado, Benjamin L. Peierls, James A. Rusak, Siddhartha Sarkar, Sapna Sharma, Jessica V. Trout-Haney
Cyanobacterial blooms have substantial direct and indirect negative impacts on freshwater ecosystems including releasing toxins, blocking light needed by other organisms, and depleting oxygen. There is growing concern over the potential for climate change to promote cyanobacterial blooms, as the positive effects of increasing lake surface temperature on cyanobacterial growth are well documented in
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Mercury stable isotopes reveal sources of methylmercury and prey in giant Pacific bluefin tuna from the western North Pacific Ocean Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-02-11 Xiaoshuai He, Yi-Sheng Chen, Shin-Jing Ang, Jen-Chieh Shiao, Chun-Mao Tseng, John R. Reinfelder
Sources of methylmercury (MeHg) in adult Pacific bluefin tuna (Thunnus orientalis, PBT) from the western North Pacific Ocean (WPO) were examined using mercury stable isotopes. Significant increases in δ202Hg and Δ199Hg values with PBT size and age, along with those of potential prey, indicate a shift in the source of MeHg accumulated by PBT as they age. Among adults from the WPO, this shift likely
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Significant methane undersaturation during austral summer in the Ross Sea (Southern Ocean) Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-02-09 Wangwang Ye, Damian L. Arévalo-Martínez, Yuhong Li, Jianwen Wen, Hailun He, Jiexia Zhang, Jian Liu, Man Wu, Liyang Zhan
Methane (CH4) is a climate-relevant trace gas that is emitted from the open and coastal oceans in considerable amounts. However, its distribution in remote oceanic areas is largely unknown. To fill this knowledge gap, dissolved CH4 was measured at nine stations at 75°S in the Ross Sea during austral summer in January 2020. CH4 undersaturation (mean: 82 ± 20%) was found throughout the water column.
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Potential drivers and consequences of regional phosphate depletion in the western subtropical North Pacific Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-02-09 Zhongwei Yuan, Thomas J. Browning, Ruifeng Zhang, Chengwang Wang, Chuanjun Du, Yanmin Wang, Ying Chen, Zhiyu Liu, Xin Liu, Dalin Shi, Minhan Dai
In regions of the nitrogen limited low latitude ocean, phosphate can also be depleted to levels initiating stress responses in marine microbes. Here, we associate a broad region of phosphate depletion in the subtropical North Pacific with different levels of phosphorus stress. Nutrient and aerosol addition experiments demonstrated primary nitrogen limitation of the bulk phytoplankton community, with
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Alkalinity contributes at least a third of annual gross primary production in a deep stratified hardwater lake Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-02-08 Pascal Perolo, Nicolas Escoffier, Hannah E. Chmiel, Gaël Many, Damien Bouffard, Marie-Elodie Perga
In alkaline freshwater systems, the apparent absence of carbon limitation to gross primary production (GPP) at low CO2 concentrations suggests that bicarbonates can support GPP. However, the contribution of bicarbonates to GPP has never been quantified in lakes along the seasons. To detect the origin of the inorganic carbon maintaining GPP, we analyze the daily stoichiometric ratios of CO2–O2 and alkalinity–O2
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Aquatic carbon fluxes in a hemiboreal catchment are predictable from landscape morphology, temperature, and runoff Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-02-06 Sivakiruthika Balathandayuthabani, Marcus B. Wallin, Leif Klemedtsson, Patrick Crill, David Bastviken
Aquatic networks contribute greenhouse gases and lateral carbon (C) export from catchments. The magnitudes of these fluxes exceed the global land C sink but are uncertain. Resolving this uncertainty is important for understanding climate feedbacks. We quantified vertical methane (CH4) and carbon dioxide (CO2) emissions from lakes and streams, and lateral export of dissolved inorganic and organic carbon
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Groundwater-stream connections shape the spatial pattern and rates of aquatic metabolism Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-02-03 Anna Lupon, Lluís Gómez-Gener, Megan L. Fork, Hjalmar Laudon, Eugènia Martí, William Lidberg, Ryan A. Sponseller
A longstanding challenge in stream ecology is to understand how landscape configuration organizes spatial patterns of ecosystem function via lateral groundwater connections. We combined laboratory bioassays and field additions of a metabolic tracer (resazurin) to test how groundwater-stream confluences, or “discrete riparian inflow points” (DRIPs), regulate heterotrophic microbial activity along a
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Coastal wetland adaptability to sea level rise: The neglected role of semi-diurnal vs. diurnal tides Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-01-26 Jean-Philippe Belliard, Olivier Gourgue, Gerard Govers, Matthew L. Kirwan, Stijn Temmerman
Tidal marshes and mangroves are threatened by relative sea level rise (RSLR) in certain regions on Earth. Elsewhere, these coastal wetlands can adapt through sediment accretion and resulting surface elevation gain. Studies identifying drivers of the global variability in coastal wetland adaptability to RSLR ignored the role of the tidal pattern, varying from semi-diurnal to diurnal globally. Here,
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Over half a century record of limnology data from Lake Powell, desert southwest United States: From reservoir filling to present day (1964–2021) Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-01-24 Bridget R. Deemer, Caitlin M. Andrews, Kristin E. Strock, Nicholas Voichick, James Hensleigh, John R. Beaver, Robert Radtke
Lake Powell is a large water storage reservoir in the arid southwestern United States. Here, we present a 58-yr limnology dataset that captures water quality parameters from reservoir filling to present day (temperature, salinity, major ions, total suspended solids), as well as a 38-yr record of Secchi depth, and a ~ 30-yr record of nutrients, phytoplankton, and zooplankton assemblages. The dataset
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Biophysical interactions control the progression of harmful algal blooms in Chesapeake Bay: A novel Lagrangian particle tracking model with mixotrophic growth and vertical migration Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-01-19 Jilian Xiong, Jian Shen, Qubin Qin, Michelle C. Tomlinson, Yinglong J. Zhang, Xun Cai, Fei Ye, Linlin Cui, Margaret R. Mulholland
Climate change and nutrient pollution contribute to the expanding global footprint of harmful algal blooms. To better predict their spatial distributions and disentangle biophysical controls, a novel Lagrangian particle tracking and biological (LPT-Bio) model was developed with a high-resolution numerical model and remote sensing. The LPT-Bio model integrates the advantages of Lagrangian and Eulerian
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Acclimation by diverse phytoplankton species determines oceanic carbon to nitrogen ratios Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-01-14 Yoshio Masuda, Yasuhiro Yamanaka, Sherwood Lan Smith, Takafumi Hirata, Hideyuki Nakano, Akira Oka, Hiroshi Sumata, Maki Noguchi Aita
The carbon to nitrogen (CN) ratio of phytoplankton connects the carbon and nitrogen cycles in the ocean. Any variation in this ratio under climate change will alter the amount of carbon fixed by photosynthesis, and ultimately the amount sequestered in the ocean. However, a consistent mechanistic explanation remains lacking for observed species-specific variations in phytoplankton CN ratios. We show
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Taxonomic identity, biodiversity, and antecedent disturbances shape the dimensional stability of stream invertebrates Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-01-12 Daniel C. Allen, Brian A. Gill, Anya Metcalfe, Sophia Bonjour, Scott Starr, Junna Wang, Diana Valentin, Nancy B. Grimm
The “dimensional stability” approach measures different components of ecological stability to investigate how they are related. Yet, most empirical work has used small-scale and short-term experimental manipulations. Here, we apply this framework to a long-term observational dataset of stream macroinvertebrates sampled between the winter flooding and summer monsoon seasons. We test hypotheses that
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Salinization of stream water and groundwater at daily to decadal scales in a temperate climate Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-01-09 Michelle D. Shattuck, Hannah M. Fazekas, Adam S. Wymore, Aneliya Cox, William H. McDowell
Elevated salt concentrations in streams draining developed watersheds are well documented, but the effects of hydrologic variability and the role of groundwater in surface water salinization are poorly understood. To characterize these effects, we use long-term data (12–19 yr) and high-frequency specific conductance (SPC) data collected from 13 streams across New Hampshire, USA. Concentration–discharge
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Documenting the impacts of increasing salinity in freshwater and coastal ecosystems: Introduction to the special issue Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-01-04 Stephanie J. Melles, Miguel Cañedo-Argüelles, Alison M. Derry
Freshwater salinization is the process of changing ion concentrations (e.g., Na+, Mg2+, K+, Cl−, CO 3 2 − , SO 4 2 − ) relative to background levels due to human activities (e.g., agriculture, application of road de-icing salts, water and resource extraction, climate change, and sea-level rise; Williams 2001; Cañedo-Argüelles et al. 2016). Although considerably less studied than other environmental
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LAGOS-US RESERVOIR: A database classifying conterminous U.S. lakes 4 ha and larger as natural lakes or reservoir lakes Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2023-01-03 Lauren K. Rodriguez, Sam M. Polus, Danielle I. Matuszak, Marcella R. Domka, Patrick J. Hanly, Qi Wang, Patricia A. Soranno, Kendra S. Cheruvelil
The LAGOS-US RESERVOIR data module classifies all 137,465 lakes ≥ 4 ha in the conterminous U.S. into three categories using a machine learning predictive model based on visual interpretation of lake outlines and a lake shape classification rule. Natural Lakes (NLs) are defined as naturally formed, lacking large, flow-altering structures; Reservoir Class A's (RSVR_A) are defined as lakes likely human-made
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Drainage-induced browning causes both loss and change of benthic biodiversity in headwater streams Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2022-12-24 Joanna Brüsecke, Timo Muotka, Kaisa-Leena Huttunen, Sanni Litjo, Wille-Pekka Lepo, Jussi Jyväsjärvi
Concentrations of dissolved organic carbon (DOC) have increased over the past few decades, causing freshwater browning. Impacts of browning on biodiversity have been little studied, despite many of the individual stressors associated with browning being known to control freshwater communities. We explored the responses of benthic invertebrates along a wide gradient of DOC concentrations (3.6–27 mg L−1)
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Microcystin as a biogeochemical cycle: Pools, fluxes, and fates of the cyanotoxin in inland waters Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2022-12-22 Quin K. Shingai, Grace M. Wilkinson
Microcystin poses a serious threat to aquatic ecosystems and human health. There is a pressing need to understand the production, movement, and storage of microcystin in lakes. We constructed a conceptual biogeochemical model for microcystin through a comprehensive literature synthesis, identifying four major pools and nine major fluxes in lakes that also connect to the terrestrial environment. This
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Clarifying water clarity: A call to use metrics best suited to corresponding research and management goals in aquatic ecosystems Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2022-12-16 Jessica S. Turner, Kelsey A. Fall, Carl T. Friedrichs
Scientific Significance Statement Water clarity is a subjective term and can be measured multiple ways. Different metrics such as light attenuation and Secchi depth vary in effectiveness depending on the research or management application. In this essay, we argue that different questions merit different water clarity metrics. In coastal and inland waters, empirical relationships to estimate light attenuation
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Extent, patterns, and drivers of hypoxia in the world's streams and rivers Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2022-12-08 Joanna R. Blaszczak, Lauren E. Koenig, Francine H. Mejia, Lluís Gómez-Gener, Christopher L. Dutton, Alice M. Carter, Nancy B. Grimm, Judson W. Harvey, Ashley M. Helton, Matthew J. Cohen
Hypoxia in coastal waters and lakes is widely recognized as a detrimental environmental issue, yet we lack a comparable understanding of hypoxia in rivers. We investigated controls on hypoxia using 118 million paired observations of dissolved oxygen (DO) concentration and water temperature in over 125,000 locations in rivers from 93 countries. We found hypoxia (DO < 2 mg L−1) in 12.6% of all river
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Understanding and predicting harmful algal blooms in a changing climate: A trait-based framework Limnol. Oceanogr. Lett. (IF 7.8) Pub Date : 2022-12-08 Elena Litchman
The worldwide proliferation of harmful algal blooms (HABs) both in freshwater and marine ecosystems make understanding and predicting their occurrence urgent. Trait-based approaches, where the focus is on functional traits, have been successful in explaining community structure and dynamics in diverse ecosystems but have not been applied extensively to HABs. The existing trait compilations suggest