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The slow and steady salinization of Sparkling Lake, Wisconsin Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2021-04-05 Hilary A. Dugan, Linnea A. Rock
The concentrations of conservative solutes in seepage lakes are determined by the relative inputs of precipitation vs. groundwater. In areas of road salt application, seepage lakes may be at high risk of salinization depending on groundwater flow. Here, we revisit a 1992 analysis on the salinization of Sparkling Lake, a deep seepage lake in Northern Wisconsin. The original analysis predicted a rapid
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Sea urchin microbiomes vary with habitat and resource availability Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2021-04-03 Paige M. Miller, Thomas Lamy, Henry M. Page, Robert J. Miller
Sea urchins are key grazers in coastal seas, where they can survive a variety of conditions and diets, enhancing their ecological impact on kelp forests and other ecosystems. Using 16S rRNA gene sequencing, we characterized bacterial communities associated with guts of the two dominant sea urchin species in southern California, the red urchin Mesocentrotus franciscanus, and the purple urchin Strongylocentrotus
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On thin ice: Linking elevation and long‐term losses of lake ice cover Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2021-02-05 Kyle R. Christianson, Kelly A. Loria, Peter D. Blanken, Nel Caine, Pieter T. J. Johnson
Despite long‐term analyses of lake ice phenology globally, comparatively little is known about high‐elevation lakes, for which climate shifts are thought to be occurring faster than at lower elevations. Using a 36‐yr dataset (1983–2018) on alpine lakes (> 3000 m ASL) from the Green Lakes Valley, Colorado (GLV), we found that ice‐cover duration decreased by an average of ~ 24 d, due to both earlier
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Size‐based characterization of freshwater dissolved organic matter finds similarities within a waterbody type across different Canadian ecozones Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2021-02-09 Pieter J. K. Aukes, Sherry L. Schiff, Jason J. Venkiteswaran, Richard J. Elgood, John Spoelstra
Dissolved organic matter (DOM) represents a mixture of organic molecules that vary due to different source materials and degree of processing. Characterizing how DOM composition evolves along the aquatic continuum can be difficult. Using a size‐exclusion chromatography technique (liquid chromatography‐organic carbon detection [LC‐OCD]), we assessed the variability in DOM composition from both surface
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Augmentation of global marine sedimentary carbon storage in the age of plastic Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2021-03-08 Craig Smeaton
Plastic is entering the world's oceans at an unprecedented rate impacting the functioning of the natural marine environment. Yet little consideration has been given to the potential of carbon (C) in the form of plastic (Cplas) to augment the marine carbon system. Here it is shown that Cplas is an integral part of the anthropogenic marine C cycle. Annually, 7.8 ± 1.73 Mt of Cplas is deposited at the
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Sea‐level rise drives wastewater leakage to coastal waters and storm drains Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2021-02-25 Trista McKenzie, Shellie Habel, Henrietta Dulai
Sea‐level rise (SLR) is expected to compromise coastal wastewater infrastructure (WIS) via groundwater inundation (GWI). We conducted a field‐based study in urban Honolulu, Hawai'i using spring tides as a proxy for future sea levels to quantify the hydrologic connection of WIS. This study focused on two possible pathways: (1) direct GWI of WIS and subsequent discharge into the coastal ocean and (2)
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Seascape topography slows predicted range shifts in fish under climate change Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2021-02-25 Curtis Champion, Melinda A. Coleman
Shifts in marine species distributions are occurring rapidly in response to climate change, yet predicted rates of change are partly dependent on the data used to estimate species distributions. While pelagic fishes are known to respond to dynamic oceanographic variables, static topographic features can also regulate their distributions, yet the effect of topography on rates of range shifts remains
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Biogeochemical control points of connectivity between a tidal creek and its floodplain Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2021-02-24 Peter Regier, Nicholas D. Ward, Julia Indivero, Cora Wiese Moore, Matt Norwood, Allison Myers‐Pigg
As global climates shift, coastal systems experience changes that alter function within the tidal zone. However, it remains uncertain how changes in tidal extent and magnitude will alter coastal biogeochemical cycling. We present high‐frequency data collected in situ along two transects across a tidal creek and floodplain to capture how vertical and lateral connectivity changes act as biogeochemical
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Founding Limnology & Oceanography Letters: The challenges, risks, and rewards of launching a new scientific journal Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2021-02-02 Patricia A. Soranno, John A. Downing, Teresa L. Curto
Omnia uno tempore erant agenda (All things were to be done at one time) — Julius Caesar on how to deal with the challenges of multiple and complex operations. —Thorne 2007. The universe of scholarly publishing includes more than 30,000 peer‐reviewed journals in the sciences and humanities (Ware and Mabe 2015), approximately 250 of which cover the aquatic sciences. Establishing a new journal within
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Reconsideration of the phytoplankton seasonality in the open Black Sea Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-12-23 Oleg A. Yunev, Jacob Carstensen, Ludmila V. Stelmakh, Vladimir N. Belokopytov, Vyacheslav V. Suslin
Chlorophyll a (Chl a) observations from satellites exhibit a unimodal seasonal variation in the open Black Sea that peaks during winter, which has led to the hypothesis that phytoplankton production is sustained by convective mixing of nitrate from deeper layers. We compiled in situ carbon‐to‐Chl a ratios for the entire year, displaying an expected seasonal pattern ranging from 46 in February to 195 mg C mg Chl−1
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Taxonomic and nutrient controls on phytoplankton iron quotas in the ocean Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-12-29 Benjamin S. Twining, Olga Antipova, P. Dreux Chappell, Natalie R. Cohen, Jeremy E. Jacquot, Elizabeth L. Mann, Adrian Marchetti, Daniel C. Ohnemus, Sara Rauschenberg, Alessandro Tagliabue
Phytoplankton iron contents (i.e., quotas) directly link biogeochemical cycles of iron and carbon and drive patterns of nutrient limitation, recycling, and export. Ocean biogeochemical models typically assume that iron quotas are either static or controlled by dissolved iron availability. We measured iron quotas in phytoplankton communities across nutrient gradients in the Pacific Ocean and found that
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Cascading effects of freshwater salinization on plankton communities in the Sierra Nevada Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-12-05 Emma R. Moffett, Henry K. Baker, Christine C. Bonadonna, Jonathan B. Shurin, Celia C. Symons
Runoff containing road salt (sodium chloride, NaCl) causes the salinization of inland freshwaters, with potentially severe impacts on aquatic species. We performed a mesocosm experiment to test the effects of salinization on plankton community structure in an oligotrophic mountain lake with a limited history of elevated salt concentrations. We exposed plankton communities to a gradient of 30 salt concentrations
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Do diatoms dominate benthic production in shallow systems? A case study from a mixed seagrass bed Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-09-29 T. Erin Cox, Just Cebrian, Marnie Tabor, Laura West, Jeffrey W. Krause
We report an assessment for determining the contribution by diatoms to community productivity and respiration within a coastal benthic ecosystem with multiple autotrophs. During summer, cores of open sediment and seagrass habitat were collected from a lagoon within the Northern Gulf of Mexico. Cores were maintained in an outdoor mesocosm. Germanic acid, an inhibitor of diatom cell division, was added
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A database of ocean primary productivity from the 14C method Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-11-16 J. F. Marra, R. T. Barber, E. Barber, R. R. Bidigare, W. S. Chamberlin, R. Goericke, B. R. Hargreaves, M. Hiscock, R. Iturriaga, Z. I. Johnson, D. A. Kiefer, C. Kinkade, C. Knudson, V. Lance, C. Langdon, Z.‐P. Lee, M. J. Perry, W. O. Smith, R. Vaillancourt, L. Zoffoli
The database on ocean primary productivity comprises over two decades (1985–2008) of data that the authors have participated in collecting, using the assimilation of inorganic 14C through photosynthesis, in incubations carried out in situ. The dataset is perhaps unique in that it uses, overwhelmingly, consistent methodology while covering a wide geographic range. Ancillary data are included. Using
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Arctic seals as tracers of environmental and ecological change Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-11-12 Camille de la Vega, Claire Mahaffey, Robyn E. Tuerena, David J. Yurkowski, Steven H. Ferguson, Garry B. Stenson, Erling S. Nordøy, Tore Haug, Martin Biuw, Sophie Smout, Jo Hopkins, Alessandro Tagliabue, Rachel M. Jeffreys
Knowledge of species trophic position (TP) is an essential component of ecosystem management. Determining TP from stable nitrogen isotopes (δ15N) in predators requires understanding how these tracers vary across environments and how they relate to predator isotope composition. We used two seal species as a model for determining TP across large spatial scales in the Arctic. δ15N in seawater nitrate
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Wikipedia can help resolve information inequality in the aquatic sciences Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-11-11 Dustin W. Kincaid, Whitney S. Beck, Jessica E. Brandt, Margaret Mars Brisbin, Kaitlin J. Farrell, Kelly L. Hondula, Erin I. Larson, Arial J. Shogren
Scientific Significance Statement Generation of and access to scientific information have traditionally been limited to those with privilege or power. The internet, and the development of Wikipedia, has revolutionized the way information is shared by allowing everyone connected to the internet to generate and access content. However, the scientific community has not taken full advantage of this information
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Continental margin sediments underlying the NE Pacific oxygen minimum zone are a source of nitrous oxide to the water column Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-11-11 Brett D. Jameson, Peter Berg, Damian S. Grundle, Catherine J. Stevens, S. Kim Juniper
Continental margin sediments are important sites of marine nitrogen cycling and potential contributors to atmospheric N2O emissions. We employed trace‐level N2O microsensors to measure vertical N2O profiles at submillimeter resolutions in intact cores from outer continental margin sediments underlying the NE Pacific oxygen minimum zone. We used mathematical modeling to estimate depth‐dependent rates
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Differential effects of press vs. pulse seawater intrusion on microbial communities of a tidal freshwater marsh Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-11-07 Courtney Mobilian, Nathan I. Wisnoski, Jay T. Lennon, Merryl Alber, Sarah Widney, Christopher B. Craft
Tidal freshwater marshes (TFMs) are threatened by seawater intrusion, which can affect microbial communities and alter biogeochemical processes. Here, we report on a long‐term, large‐scale manipulative field experiment that investigated continuous (press) and episodic (pulse, 2 months/yr) inputs of brackish water on microbial communities in a TFM. After 2.5 yr, microbial diversity was lower in press
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Whole‐ecosystem oxygenation experiments reveal substantially greater hypolimnetic methane concentrations in reservoirs during anoxia Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-11-02 Alexandria G. Hounshell, Ryan P. McClure, Mary E. Lofton, Cayelan C. Carey
Lakes and reservoirs globally produce large quantities of methane and carbon dioxide in their sediments, which accumulate in the hypolimnia (bottom waters) during thermally stratified conditions. A key parameter controlling hypolimnetic greenhouse gas concentrations is dissolved oxygen. Land use and climate change have increased hypolimnetic anoxia worldwide in lakes and reservoirs, which is expected
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Thinking like a consumer: Linking aquatic basal metabolism and consumer dynamics Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-10-31 Janine Rüegg, Caitlin C. Conn, Elizabeth P. Anderson, Tom J. Battin, Emily S. Bernhardt, Marta Boix Canadell, Sophia M. Bonjour, Jacob D. Hosen, Nicholas S. Marzolf, Charles B. Yackulic
The increasing availability of high‐frequency freshwater ecosystem metabolism data provides an opportunity to identify links between metabolic regimes, as gross primary production and ecosystem respiration patterns, and consumer energetics with the potential to improve our current understanding of consumer dynamics (e.g., population dynamics, community structure, trophic interactions). We describe
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Total alkalinity production in a mangrove ecosystem reveals an overlooked Blue Carbon component Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-10-16 Vincent Saderne, Marco Fusi, Timothy Thomson, Aislinn Dunne, Fatima Mahmud, Florian Roth, Susana Carvalho, Carlos M. Duarte
Mangroves have the capacity to sequester organic carbon (Corg) in their sediments permanently. However, the carbon budget of mangroves is also affected by the total alkalinity (TA) budget. Principally, TA emitted from carbonate sediment dissolution is a perennial sink of atmospheric CO2. The assessment of the TA budget of mangrove carbonate sediments in the Red Sea revealed a large TA emission of 403 ± 17 mmol m−2
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Elevated organic carbon pulses persist in estuarine environment after major storm events Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-09-15 Eero Asmala, Christopher L. Osburn, Ryan W. Paerl, Hans W. Paerl
Estuaries regulate transport of dissolved organic carbon (DOC) from land to ocean. Export of terrestrial DOC from coastal watersheds is exacerbated by increasing major rainfall and storm events and human activities, leading to pulses of DOC that are shunted through rivers downstream to estuaries. Despite an upward trend of extreme events, the fate of the pulsed terrestrial DOC in estuaries remains
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Dissolved organic matter regulates nutrient limitation and growth of benthic algae in northern lakes through interacting effects on nutrient and light availability Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-08-29 Megan L. Fork, Jan Karlsson, Ryan A. Sponseller
Widespread increases in dissolved organic matter (DOM) concentration across northern lakes can alter rates of primary production by increasing nutrient availability and decreasing light availability. These dual effects of DOM generate a unimodal relationship in pelagic primary production and primary producer biomass among lakes over a gradient of DOM concentration. However, the responses of benthic
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Effects of lake warming on the seasonal risk of toxic cyanobacteria exposure Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-06-18 Nicole M. Hayes, Heather A. Haig, Gavin L. Simpson, Peter R. Leavitt
Incidence of elevated harmful algal blooms and concentrations of microcystin are increasing globally as a result of human‐mediated changes in land use and climate. However, few studies document changes in the seasonal and interannual concentrations of microcystin in lakes. Here, we modeled 11 yr of biweekly microcystin data from six lakes to characterize the seasonal patterns in microcystin concentration
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Deep zooplankton rely on small particles when particle fluxes are low Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-06-13 Sonia Romero‐Romero, Cassie A. Ka'apu‐Lyons, Blaire P. Umhau, Claudia R. Benitez‐Nelson, Cecelia C. S. Hannides, Hilary G. Close, Jeffrey C. Drazen, Brian N. Popp
The fate of organic matter (OM) in the deep ocean remains enigmatic, with little understood regarding the flux and its utilization by deep food webs. We used compound‐specific nitrogen stable isotope ratios of source amino acids measured in particle size classes and deep zooplankton (700–1500 m) to determine the contribution of small (0.7–53 μm) vs. large particles (> 53 μm) to their diet at four sites
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Simple rules for concise scientific writing Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-06-13 Scott Hotaling
Scientific Significance Statement One of the most common editorial refrains, regardless of discipline, is “this needs to be tighter.” It typically means too many words and ideas are jumbled together and the underlying point is obscure. The writing is not concise. But, improving conciseness is difficult because the problem is caused by a host of factors that are easily overlooked, especially by early
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Methane emission offsets carbon dioxide uptake in a small productive lake Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-06-10 Dominic Vachon, Timon Langenegger, Daphne Donis, Stan E. Beaubien, Daniel F. McGinnis
Here, we investigate the importance of net CH4 production and emissions in the carbon (C) budget of a small productive lake by monitoring CH4, CO2, and O2 for two consecutive years. During the study period, the lake was mostly a net emitter of both CH4 and CO2, while showing positive net ecosystem production. The analyses suggest that during the whole study period, 32% ± 26% of C produced by net ecosystem
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Native and invasive zooplankton show differing responses to decadal‐scale increases in maximum temperatures in a large temperate river Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-05-30 Eric Dexter, Stephen M. Bollens, Gretchen Rollwagen‐Bollens
It has been widely proposed that increasing global temperatures will promote the geographic spread of invasive species, yet few studies have examined the effects of increasing temperatures on existing populations of invaders. Here, we examine temperature trends across a 70‐year series of daily records from the lower Columbia River (Washington and Oregon), and assess the correlation between interannual
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Density‐dependent mechanisms regulate spore formation in the diatom Chaetoceros socialis Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-05-27 Angela Pelusi, Francesca Margiotta, Augusto Passarelli, Maria Immacolata Ferrante, Maurizio Ribera d'Alcalà, Marina Montresor
Resting stages are reported for several unicellular eukaryotes including diatoms that can produce spores or resting cells. These stages represent a repository of diversity in sediments but the factors that induce their formation are elusive. We investigated spore formation in the marine diatom Chaetoceros socialis. Our results confirm that nitrogen starvation is an effective experimental trigger for
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Interactive effects of iron and temperature on the growth of Fragilariopsis cylindrus Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-05-23 Loay Jabre, Erin M. Bertrand
Iron and temperature are important drivers controlling phytoplankton growth in the Southern Ocean (SO). Most studies examining phytoplankton responses to these variables consider them independently, testing responses to changing temperature under constant iron and vice versa. Consequently, we lack a phenomenological and mechanistic understanding of how concurrent changes in these variables influence
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Warming advances virus population dynamics in a temperate freshwater plankton community Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-05-22 Thijs Frenken, Corina P. D. Brussaard, Mandy Velthuis, Ralf Aben, Garabet Kazanjian, Sabine Hilt, Sarian Kosten, Edwin T. H. M. Peeters, Lisette N. de Senerpont Domis, Susanne Stephan, Ellen van Donk, Dedmer B. Van de Waal
Viruses are important drivers in the cycling of carbon and nutrients in aquatic ecosystems. Since viruses are obligate parasites, their production completely depends on growth and metabolism of hosts and therefore can be affected by climate change. Here, we investigated if warming (+4°C) can change the outcome of viral infections in a natural freshwater virus community over a 5‐month period in a mesocosm
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Internal loading in stormwater ponds as a phosphorus source to downstream waters Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-04-29 Vinicius J. Taguchi, Tyler A. Olsen, Poornima Natarajan, Ben D. Janke, John S. Gulliver, Jacques C. Finlay, Heinz G. Stefan
We assessed the prevalence and causes of sediment phosphorus (P) release within urban stormwater ponds, a process that may reduce P removal by sedimentation. Data collected from surface water of 98 urban stormwater ponds in Minnesota showed that nearly 40% had median summer total P concentrations in excess of average stormwater runoff (0.38 mg L−1), implying effects of internal loading. We sampled
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Light fluctuations are key in modulating plankton trophic dynamics and their impact on primary production Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-04-28 Françoise Morison, Gayantonia Franzè, Elizabeth Harvey, Susanne Menden‐Deuer
Surface‐ocean mixing creates dynamic light environments with predictable effects on phytoplankton growth but unknown consequences for predation. We investigated how variations in average mixed‐layer (ML) irradiance shaped plankton trophic dynamics by incubating a Northwest‐Atlantic plankton community for 4 days at high (H) and low (L) light, followed by exposure to either sustained or reversed light
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Giant kelp microbiome altered in the presence of epiphytes Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-04-28 Anna K. James, Chance J. English, Nicholas J. Nidzieko, Craig A. Carlson, Elizabeth G. Wilbanks
Characterizing patterns in the microbial communities associated with canopy‐forming kelps is critical to understanding the mechanisms shaping macroalgal microbiomes. Using 16S rRNA gene sequencing, we characterized bacterial and archaeal communities associated with giant kelp in the Santa Barbara Channel. Our results indicate that kelp‐associated microbial communities are altered in the presence of
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Dityrosine formation via reactive oxygen consumption yields increasingly recalcitrant humic‐like fluorescent organic matter in the ocean Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-03-18 Ryan W. Paerl, Iliana M. Claudio, Michael R. Shields, Thomas S. Bianchi, Christopher L. Osburn
Marine dissolved organic matter (DOM) is a massive elemental pool on Earth and is thought to consist of a chemically complex mixture of molecules. Part of marine DOM is fluorescent (FDOM) and includes humic‐like compounds. The chemical composition of, and biochemical pathways that yield, autochthonous humic‐like FDOM in the ocean is largely unknown. Inspired by medical and biochemical research detailing
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Stochastic dynamics of Cyanobacteria in long‐term high‐frequency observations of a eutrophic lake Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-02-26 Stephen R. Carpenter, Babak M. S. Arani, Paul C. Hanson, Marten Scheffer, Emily H. Stanley, Egbert Van Nes
Concentrations of phycocyanin, a pigment of Cyanobacteria, were measured at 1‐min intervals during the ice‐free seasons of 2008–2018 by automated sensors suspended from a buoy at a central station in Lake Mendota, Wisconsin, U.S.A. In each year, stochastic‐dynamic models fitted to time series of log‐transformed phycocyanin concentration revealed two alternative stable states and random factors that
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Beyond the trends: The need to understand multiannual dynamics in aquatic ecosystems Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-02-25 Grace M. Wilkinson, Jonathan Walter, Rachel Fleck, Michael L. Pace
Scientific Significance Statement Interannual variability is a pervasive feature of aquatic ecosystems. This variability results from short‐ and long‐term dynamics of biotic and abiotic origin, inclusive of multiannual variability and long‐term trends. Although understanding short‐term variability and forecasting directional change are important research efforts, far less attention has been paid to
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Bottom trawling reduces benthic denitrification and has the potential to influence the global nitrogen cycle Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-02-14 Angus J. P. Ferguson, Joanne Oakes, Bradley D. Eyre
Bottom trawling and eutrophication are large stressors that are critically coupled. Here we show, using a before‐after control‐effect design, the significant reduction in denitrification as a result of experimental bottom trawling in a shallow coastal system. Trawl disturbance destroys the complex three‐dimensional redox structures in surface sediments that maximize denitrification potential, resulting
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Paired O2–CO2 measurements provide emergent insights into aquatic ecosystem function Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-02-12 Dominic Vachon, Steven Sadro, Matthew J. Bogard, Jean‐François Lapierre, Helen M. Baulch, James A. Rusak, Blaize A. Denfeld, Alo Laas, Marcus Klaus, Jan Karlsson, Gesa A. Weyhenmeyer, Paul A. del Giorgio
Metabolic stoichiometry predicts that dissolved oxygen (O2) and carbon dioxide (CO2) in aquatic ecosystems should covary inversely; however, field observations often diverge from theoretical expectations. Here, we propose a suite of metrics describing this O2 and CO2 decoupling and introduce a conceptual framework for interpreting these metrics within aquatic ecosystems. Within this framework, we interpret
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Should we be sampling zooplankton at night? Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-02-11 Jonathan P. Doubek, Sadye K. Goldfarb, Jason D. Stockwell
Limnologists generally sample during the day. Consequently, many estimates of lake ecosystem processes are derived from daytime samples. Zooplankton, which play critical roles in many such processes, are typically sampled during the day in the pelagic zone, although they commonly exhibit diel vertical and horizontal migration. Demographic estimates using day pelagic sampling may be biased depending
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Organic sulfur: A spatially variable and understudied component of marine organic matter Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-02-05 Krista Longnecker, Lisa Oswald, Melissa C. Kido Soule, Gregory A. Cutter, Elizabeth B. Kujawinski
Sulfur (S) is a major heteroatom in organic matter. This project evaluated spatial variability in the concentration and molecular‐level composition of organic sulfur along gradients of depth and latitude. We measured the concentration of total organic sulfur (TOS) directly from whole seawater. Our data reveal high variability in organic sulfur, relative to established variability in total organic carbon
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Photomineralization of organic carbon in a eutrophic, semiarid estuary Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-01-28 Hongjie Wang, Xinping Hu, Michael S. Wetz, Kenneth C. Hayes, Kaijun Lu
The effect of photomineralization on the carbon cycle in a eutrophic, semiarid estuary (Baffin Bay, Texas) was investigated using closed‐system incubations. Photochemical production rate of dissolved inorganic carbon ranged from 0.16 to 0.68 μM hr−1, with a daily removal of 0.3∼1.5% of the standing stock of dissolved organic carbon (DOC). The photomineralization rate was negatively correlated with
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Microplastic ingestion and diet composition of planktivorous fish Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-01-23 Clara Lopes, Joana Raimundo, Miguel Caetano, Susana Garrido
Planktivorous pelagic fish are susceptible to accumulating microplastics (MP), which have the same size range as their prey and accumulate in their feeding and spawning grounds. We analyzed stomach contents of pelagic fish (European sardine, horse mackerel, anchovy, chub mackerel, Atlantic mackerel, and bogue) from Atlanto‐Iberian waters to investigate the relationship between MP ingestion, their diet
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Micro‐by‐micro interactions: How microorganisms influence the fate of marine microplastics Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-01-22 Kelsey L. Rogers, Joan A. Carreres‐Calabuig, Elena Gorokhova, Nicole R. Posth
Microorganisms drive the biogeochemical cycles that link abiotic and biotic processes in the aqueous environment and are intricately associated with plastic debris. The presence of microplastics in water and sediment introduces new concerns as small particle size allows for increased pathways of microplastics in the food web and element cycles. In this review, we present the current state of knowledge
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Low snowpack reduces thermal response diversity among streams across a landscape Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-01-22 Timothy J. Cline, Daniel E. Schindler, Timothy E. Walsworth, David W. French, Peter J. Lisi
Spatial and temporal variation in thermal conditions are important dimensions of aquatic landscapes, yet we do not understand how this heterogeneity will respond to climate change. Snowpack in many regions is declining but impacts on aquatic thermal regimes remain poorly understood. Our analyses of summer stream temperatures across a complex river basin in southwest Alaska show that loss of snowpack
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Storm‐induced turbulence alters shelf sea vertical fluxes Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-01-22 Larissa K. P. Schultze, Lucas M. Merckelbach, Jeffrey R. Carpenter
Storms are infrequent, intense, physical forcing events that represent a potentially significant driver of ocean ecosystems. The objective of this study was to assess changes in water column structure and turbulent fluxes caused by storms using an autonomous underwater glider, as well as the chlorophyll a (Chl a) response to the altered physical environment. The glider was able to measure throughout
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On freshwater fluxes and the Atlantic meridional overturning circulation Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-01-16 B. B. Cael, Malte F. Jansen
We address the role of freshwater forcing in the modern day ocean. Specifically, we ask the question of whether an amplification of the global freshwater forcing pattern leads to a strengthening or weakening of the steady‐state Atlantic Meridional Overturning Circulation (AMOC). While the role of freshwater forcing in the AMOC has received much attention, this question remains unresolved, in part because
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Snowpack determines relative importance of climate factors driving summer lake warming Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-01-14 Adrianne P. Smits, Sally MacIntyre, Steven Sadro
Mountain lakes experience extreme interannual climate variation as well as rapidly warming air temperatures, making them ideal systems to understand lake‐climate responses. Snowpack and water temperature are highly correlated in mountain lakes, but we lack a complete understanding of underlying mechanisms. Motivated by predicted declines in snowfall with future temperature increases, we investigated
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Microplastic contamination in Corpus Christi Bay blue crabs, Callinectes sapidus Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-01-09 Elijah N. Waddell, Nigel Lascelles, Jeremy L. Conkle
Microplastic pollution has been observed in marine environments around the world and has the potential to negatively impact marine organisms if ingested. Blue crabs (Callinectes sapidus) are susceptible to this pollution because they feed in sediment where dense plastics accumulate. Microplastic ingestion by blue crabs was assessed in Corpus Christi Bay, TX. Crab stomachs were extracted and digested
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Microplastic prevalence in two fish species in two U.S. reservoirs Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-01-08 Raven Hurt, Catherine M. O'Reilly, William L. Perry
Microplastics in the environment can impact feeding and physiological functions of organisms. Most studies have focused on marine systems, and studies of lacustrine organisms are less common. We examined microplastic concentration in 72 gizzard shad and 24 largemouth bass from two agricultural reservoirs in the midwestern U.S.A. with differing shoreline development. Microplastics were found in 100%
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Feeding behavior is the main driver for microparticle intake in mangrove crabs Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-01-07 Christelle Not, Cheuk Yan Iris Lui, Stefano Cannicci
As marine plastic debris is primarily sourced from terrestrial input, coastal environments are particularly affected by deposition. Because of their pneumatophores, mangroves have been recognized for their importance in confining plastic waste. Crabs are a dominant component of the mangrove ecosystem and play a critical role in maintaining healthy and resilient mangrove forests. Therefore, the presence
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Trophic transfer of microplastics in an estuarine food chain and the effects of a sorbed legacy pollutant Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-01-07 Samantha N. Athey, Samantha D. Albotra, Cessely A. Gordon, Bonnie Monteleone, Pamela Seaton, Anthony L. Andrady, Alison R. Taylor, Susanne M. Brander
Microplastics are of increasing concern as they are readily ingested by aquatic organisms. This study investigated microplastic trophic transfer using larval inland silversides (Menidia beryllina) (5 d posthatch) and unicellular tintinnid (Favella spp.) as a model food chain relevant to North American estuaries. Low‐density polyethylene microspheres (10–20 μm) were used to compare direct ingestion
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Microbial colonization of microplastics in the Caribbean Sea Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2020-01-06 Kassandra L. Dudek, Bianca N. Cruz, Beth Polidoro, Susanne Neuer
Microplastics in the ocean function as an artificial microbial reef, with diverse communities of eukaryotic and bacterial microbiota colonizing its surface. It is not well understood if these communities are specific for the type of microplastic on which they develop. Here, we carried out a 6‐week long incubation experiment of six common plastic polymers in Bocas del Toro, Panama. The community composition
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Effects of environmentally relevant concentrations of microplastic fibers on Pacific mole crab (Emerita analoga) mortality and reproduction Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2019-12-30 Dorothy A. Horn, Elise F. Granek, Clare L. Steele
Microplastics are ubiquitous in marine systems; however, knowledge of the effects of these particles on marine fauna is limited. Ocean‐borne plastic debris accumulates in littoral ecosystems worldwide, and invertebrate infauna inhabiting these systems can ingest small plastic particles and fibers, mistaking them for food. We examined the effect of microplastic fibers on physiological and reproductive
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The effect of urban point source contamination on microplastic levels in water and organisms in a cold‐water stream Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2019-12-30 Claire B. Simmerman, Jill K. Coleman Wasik
We examined the influence of point and nonpoint source contamination on microplastic (MP) levels in water, macroinvertebrates, and trout in a small, cold‐water stream in western Wisconsin, U.S.A. We collected samples along an urbanization gradient centered around a 6‐mile corridor that receives numerous MP inputs from stormwater outfalls and a wastewater plant. We digested samples using a wet peroxide
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Increasing accuracy of lake nutrient predictions in thousands of lakes by leveraging water clarity data Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2019-12-27 Tyler Wagner, Noah R. Lottig, Meridith L. Bartley, Ephraim M. Hanks, Erin M. Schliep, Nathan B. Wikle, Katelyn B. S. King, Ian McCullough, Joseph Stachelek, Kendra S. Cheruvelil, Christopher T. Filstrup, Jean Francois Lapierre, Boyang Liu, Patricia A. Soranno, Pang‐Ning Tan, Qi Wang, Katherine Webster, Jiayu Zhou
Aquatic scientists require robust, accurate information about nutrient concentrations and indicators of algal biomass in unsampled lakes in order to understand and predict the effects of global climate and land‐use change. Historically, lake and landscape characteristics have been used as predictor variables in regression models to generate nutrient predictions, but often with significant uncertainty
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Diel temperature and pH variability scale with depth across diverse coral reef habitats Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2019-12-20 Tyler Cyronak, Yuichiro Takeshita, Travis A. Courtney, Eric H. DeCarlo, Bradley D. Eyre, David I. Kline, Todd Martz, Heather Page, Nichole N. Price, Jennifer Smith, Laura Stoltenberg, Martin Tresguerres, Andreas J. Andersson
Coral reefs are facing intensifying stressors, largely due to global increases in seawater temperature and decreases in pH. However, there is extensive environmental variability within coral reef ecosystems, which can impact how organisms respond to global trends. We deployed spatial arrays of autonomous sensors across distinct shallow coral reef habitats to determine patterns of spatiotemporal variability
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Ultra‐small and abundant: Candidate phyla radiation bacteria are potential catalysts of carbon transformation in a thermokarst lake ecosystem Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2019-12-03 Adrien Vigneron, Perrine Cruaud, Valérie Langlois, Connie Lovejoy, Alexander I. Culley, Warwick F. Vincent
The candidate phyla radiation (CPR) is a diverse group of uncultured bacterial lineages with poorly understood metabolic functions. CPR bacteria can represent a large proportion of the total planktonic microbial community in subarctic thermokarst lakes, but their functional roles remain unexplored. We applied sequential water filtration and metagenomic shotgun sequencing to a peatland permafrost thaw
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Capacity of the common Arctic picoeukaryote Micromonas to adapt to a warming ocean Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2019-12-02 Ina Benner, Andrew J. Irwin, Zoe V. Finkel
Phytoplankton are sensitive to temperature and other environmental conditions expected to change with warming over the next century. We quantified the capacity of an ecologically dominant Arctic phytoplankton species, Micromonas polaris, to adapt to changes in temperature, increased temperature and irradiance, and increased temperature and periodic nitrogen starvation, over several hundred generations
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Patterns of suspended and salp‐ingested microplastic debris in the North Pacific investigated with epifluorescence microscopy Limnol. Oceanogr. Lett. (IF 5.242) Pub Date : 2019-11-27 Jennifer A. Brandon, Alexandra Freibott, Linsey M. Sala
Microplastics (< 5 mm) have long been a concern in marine debris research, but quantifying the smallest microplastics (< 333 μm) has been hampered by appropriate collection methods, like net tows. We modified standard epifluorescence microscopy methods to develop a new technique to enumerate < 333 μm microplastics (mini‐microplastics) from filtered surface seawater samples and salp stomach contents
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