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Ecological resilience in tropical Andean lakes: A paleolimnological perspective Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-04-13 Xavier Benito, Melina Luethje, Tobias Schneider, Sherilyn C. Fritz, Paul A. Baker, Eric J. Pedersen, Pierre Gaüzère, Majoi de Novaes Nascimento, Mark Bush, Albert Ruhi
Little is known about whether changes in lake ecosystem structure over the past 150 years are unprecedented when considering longer timescales. Similarly, research linking environmental stressors to lake ecological resilience has traditionally focused on a few sentinel sites, hindering the study of spatially synchronous changes across large areas. Here, we studied signatures of paleolimnological resilience
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Heterotrophic nitrogen fixation in response to nitrate loading and sediment organic matter in an emerging coastal deltaic floodplain within the Mississippi River Delta plain Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-04-13 Song Li, Robert R. Twilley, Aixin Hou
Increasing nitrate (NO3−) loading in rivers due to agricultural fertilization alters benthic nitrogen (N) cycling and shifts coastal wetlands from being a net source to net sink of reactive N. Heterotrophic N2 fixation that converts N2 to reactive N is often assumed negligible in eutrophic ecosystems and excluded in coastal N budget evaluations. We investigated N2 fixation and denitrification in response
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Lipid biomarkers reveal the trophic plasticity of octocorals along a depth gradient Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-04-13 Chloé Alexandra Pupier, Miguel Mies, Maoz Fine, Ronaldo Bastos Francini‐Filho, Frederico Pereira Brandini, Leonardo Zambotti‐Villela, Pio Colepicolo, Christine Ferrier‐Pagès
Symbiotic octocorals are important reef inhabitants, from shallow to mesophotic depths. However, information regarding their nutritional ecology along the depth gradient, and in particular the changes in the autotrophic and heterotrophic acquisition of nutrients, is limited, despite the fact that nutrient acquisition is a fundamental process in explaining the distribution of reef organisms. Here, the
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The influence of lipid content and taxonomic affiliation on methane and carbon dioxide production from phytoplankton biomass in lake sediment Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-04-09 Minna Hiltunen, Hannu Nykänen, Jari Syväranta
The greenhouse gases methane (CH4) and carbon dioxide (CO2) are end products of microbial anaerobic degradation of organic matter (OM) in lake sediments. Although previous research has shown that phytoplankton lipid content influences sediment methanogenesis, current understanding on how OM quality affects methanogenesis is still limited. Such information is needed to more accurately assess how lake
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Influence of settling organic matter quantity and quality on benthic nitrogen cycling Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-04-07 Séréna Albert, Stefano Bonaglia, Nellie Stjärnkvist, Monika Winder, Bo Thamdrup, Francisco J. A. Nascimento
Coastal sediments are major contributors to global carbon (C) mineralization and nutrient cycling and are tightly linked to processes in the pelagic environment. In this study, we aimed to investigate the regulating potential of quantity and quality of planktonic organic matter (OM) deposition on benthic metabolism, with a particular focus on nitrogen (N) cycling processes. We simulated inputs of spring
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Selective feeding and linkages to the microbial food web by the doliolid Dolioletta gegenbauri Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-04-07 Marc E. Frischer, Lauren M. Lamboley, Tina L. Walters, Jay A. Brandes, Erin Arneson, Lulu E. Lacy, Natalia B. López‐Figueroa, Áurea E. Rodríguez‐Santiago, Deidre M. Gibson
Gelatinous zooplankton play a crucial role in pelagic marine food webs, however, due to methodological challenges and persistent misconceptions of their importance, the trophic role of gelatinous zooplankton remains poorly investigated. This is particularly true for small gelatinous zooplankton including the marine pelagic tunicate, Dolioletta gegenbauri. D. gegenbauri and other doliolid species occur
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The extent and variability of storm‐induced temperature changes in lakes measured with long‐term and high‐frequency data Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-04-07 Jonathan P. Doubek, Orlane Anneville, Gaël Dur, Aleksandra M. Lewandowska, Vijay P. Patil, James A. Rusak, Nico Salmaso, Christian Torsten Seltmann, Dietmar Straile, Pablo Urrutia‐Cordero, Patrick Venail, Rita Adrian, María B. Alfonso, Curtis L. DeGasperi, Elvira de Eyto, Heidrun Feuchtmayr, Evelyn E. Gaiser, Scott F. Girdner, Jennifer L. Graham, Hans‐Peter Grossart, Josef Hejzlar, Stéphan Jacquet
The intensity and frequency of storms are projected to increase in many regions of the world because of climate change. Storms can alter environmental conditions in many ecosystems. In lakes and reservoirs, storms can reduce epilimnetic temperatures from wind‐induced mixing with colder hypolimnetic waters, direct precipitation to the lake's surface, and watershed runoff. We analyzed 18 long‐term and
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Ecological stoichiometry of functional traits in a colonial harmful cyanobacterium Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-04-07 Zhipeng Duan, Xiao Tan, Hans W. Paerl, Dedmer B. Van de Waal
Trait‐based approaches provide a mechanistic framework crossing scales from cellular traits to community dynamics, while ecological stoichiometry applies first principles to understand how the balance of energy and elements shape ecological interactions. However, few studies have explicitly linked both frameworks. In this study, we tested the stoichiometric regulation of a number of carbon (C) based
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Control of a phytoplankton bloom by wind‐driven vertical mixing and light availability Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-04-07 Joanne E. Hopkins, Matthew R. Palmer, Alex J. Poulton, Anna E. Hickman, Jonathan Sharples
The balance of physical and biological processes governing phytoplankton growth rates and the accumulation of biomass is widely debated in the literature, notably during the winter–spring transition. Here we show, in a temperate shelf sea that variability in the depth of the actively mixing surface layer is the leading order control. During a 2‐week period preceding the peak of the spring bloom we
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Scaling effects of a eutrophic river plume on organic carbon consumption Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-04-07 Chung‐Chi Chen, Gwo‐Ching Gong, Kuo‐Ping Chiang, Fuh‐Kwo Shiah, Chih‐Ching Chung, Chin‐Chang Hung
The amount of fluvial input has important impacts on shelf regions. To understand how the magnitude of fluvial discharge affects plume ecosystems, particularly organic carbon consumption, data over 10 consecutive summers (2003–2012) were examined in the Changjiang River plume of the East China Sea. The area of the Changjiang River plume ranged from approximately 4.90 × 103 km2 to 94.83 × 103 km2 and
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The importance of jellyfish–microbe interactions for biogeochemical cycles in the ocean Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-04-07 Tinkara Tinta, Katja Klun, Gerhard J. Herndl
Jellyfish blooms can represent a significant but largely overlooked source of organic matter (OM), in particular at the local and regional scale. We provide an overview of the current state of knowledge on the bloom‐forming jellyfish as sink and source of OM for microorganisms. In particularly, we compare the composition, concentration, and release rates of the OM excreted by living jellyfish with
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Toward resolving disparate accounts of the extent and magnitude of nitrogen fixation in the Eastern Tropical South Pacific oxygen deficient zone Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-04-07 Corday R. Selden, Margaret R. Mulholland, Brittany Widner, Peter Bernhardt, Amal Jayakumar
Examination of dinitrogen (N2) fixation in the Eastern Tropical South Pacific oxygen deficient zone has raised questions about the range of diazotrophs in the deep sea and their quantitative importance as a source of new nitrogen globally. However, technical considerations in the deployment of stable isotopes in quantifying N2 fixation rates have complicated interpretation of this research. Here, we
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Seasonal shifts of microbial methane oxidation in Arctic shelf waters above gas seeps Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-04-07 Friederike Gründger, David Probandt, Katrin Knittel, Vincent Carrier, Dimitri Kalenitchenko, Anna Silyakova, Pavel Serov, Bénédicte Ferré, Mette M. Svenning, Helge Niemann
The Arctic Ocean subseabed holds vast reservoirs of the potent greenhouse gas methane (CH4), often seeping into the ocean water column. In a continuously warming ocean as a result of climate change an increase of CH4 seepage from the seabed is hypothesized. Today, CH4 is largely retained in the water column due to the activity of methane‐oxidizing bacteria (MOB) that thrive there. Predicted future
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The impact of seasonal sulfate–methane transition zones on methane cycling in a sulfate‐enriched freshwater environment Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-04-07 Jan F. Kleint, Yannic Wellach, Moritz Schroll, Frank Keppler, Margot Isenbeck‐Schröter
Lake Willersinnweiher located in south‐western Germany is a small eutrophic gravel pit lake fed by sulfate‐enriched groundwater. The aim of this study was to investigate the total methane (CH4) mass balance of Lake Willersinnweiher with a particular focus on the interaction of carbon and sulfur cycling within the lake sediments and the redoxcline of the water column. Our results show that Lake Willersinnweiher
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Amino acid δ13C and δ15N analyses reveal distinct species‐specific patterns of trophic plasticity in a marine symbiosis Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-04-07 Christopher B. Wall, Natalie J. Wallsgrove, Ruth D. Gates, Brian N. Popp
Compound‐specific isotope analyses (CSIA) and multivariate “isotope fingerprinting” track biosynthetic sources and reveal trophic interactions in food webs. However, CSIA have not been widely applied in the study of marine symbioses. Here, we exposed a reef coral (Montipora capitata) in symbiosis with Symbiodiniaceae algae to experimental treatments (autotrophy, mixotrophy, heterotrophy) to test for
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Rapid photoacclimation during episodic deep mixing augments the biological carbon pump Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-04-05 W. Bryce Penta, James Fox, Kimberly H. Halsey
Episodic deep mixing events are one component of the biological carbon pump that physically transports organic carbon into the mesopelagic. Episodic deep mixing also disrupts summertime thermal stratification thereby changing the light field and nutrient concentrations available for phytoplankton growth. Phytoplankton survival and growth below the mixed layer following restratification depends on how
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Dynamic macromolecular composition and high exudation rates in Prochlorococcus Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-04-03 Dalit Roth‐Rosenberg, Dikla Aharonovich, Anne Willem Omta, Michael J. Follows, Daniel Sher
Every living cell is composed of macromolecules such as proteins, DNA, RNA, and pigments. The ratio between these macromolecular pools depends on the allocation of resources within the organism to different physiological requirements, and in turn affects biogeochemical cycles of elements such as carbon, nitrogen, and phosphorus. Here, we present detailed measurements of the macromolecular composition
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A coastal N2 fixation hotspot at the Cape Hatteras front: Elucidating spatial heterogeneity in diazotroph activity via supervised machine learning Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-04-03 Corday R. Selden, P. Dreux Chappell, Sophie Clayton, Alfonso Macías‐Tapia, Peter W. Bernhardt, Margaret R. Mulholland
In the North Atlantic Ocean, dinitrogen (N2) fixation on the western continental shelf represents a significant fraction of basin‐wide nitrogen (N) inputs. However, the factors regulating coastal N2 fixation remain poorly understood, in part due to sharp physico‐chemical gradients and dynamic water mass interactions that are difficult to constrain via traditional oceanographic approaches. This study
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Sulfate reduction and methanogenesis in the hypersaline deep waters and sediments of a perennially ice‐covered lake Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-04-03 Matthew A. Saxton, Vladimir A. Samarkin, Michael T. Madigan, Marshall W. Bowles, William Matthew Sattley, Charles A. Schutte, Samantha B. Joye
Documenting anaerobic microbial metabolisms in hypersaline perennially ice‐covered lakes in Antarctica further refines the environmental limits to life and may reveal rare biogeochemical mechanisms and/or novel microbial catalysts of elemental cycling. We assessed rates of sulfate reduction, methanogenesis, and anaerobic oxidation of methane using radiotracers and generated 16S rRNA gene libraries
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Multi‐omics reveal the pathways involved in induced defensive colony formation of Tetradesmus obliquus in response to Daphnia grazing cues Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-03-29 Xuexia Zhu, Yunfei Sun, Lu Zhang, Jun Wang, Lei Gu, Yuan Huang, Zhou Yang
Inducible defenses occur in various taxa of prey organisms. Many phytoplankton species, including the freshwater Chlorophyta Tetradesmus spp., can form defensive morphs under the zooplankton‐released grazing cues. However, definite statements on the actual mechanisms of inducible defense in phytoplankton are quite deficient. In the present study, the defensive mechanism of Tetradesmus obliquus (formerly
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A chemosynthetic ecotone—“chemotone”—in the sediments surrounding deep‐sea methane seeps Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-03-29 Oliver S. Ashford, Shuzhe Guan, Dante Capone, Katherine Rigney, Katelynn Rowley, Victoria Orphan, Sean W. Mullin, Kat S. Dawson, Jorge Cortés, Greg W. Rouse, Guillermo F. Mendoza, Raymond W. Lee, Erik E. Cordes, Lisa A. Levin
Ecotones have been described as “biodiversity hotspots” from myriad environments, yet have not been studied extensively in the deep ocean. While physiologically challenging, deep‐water methane seeps host highly productive communities fueled predominantly by chemosynthetic pathways. We hypothesized that the biological and geochemical influence of methane seeps extends into background habitats, resulting
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Greening of the boreal peatland food web: Periphyton supports secondary production in northern peatlands Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-03-19 Hannah M. Ferguson, Elizabeth J. Slagle, Ann Ashlea McCann, Jeremy T. Walls, Kevin H. Wyatt, Allison R. Rober
Characterizing spatial and temporal variability of food web dynamics is necessary to predict how wetter and more nutrient‐rich conditions expected with climate change will influence the fate of organic matter within northern peatlands. The goals of this study were to (1) document spatial and temporal variability in the contribution of periphyton to peatland food webs using isotope analysis (13C and
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Unexpected role of communities colonizing dead coral substrate in the calcification of coral reefs Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-03-17 Manoela Romanó de Orte, David A. Koweek, Tyler Cyronak, Yuichiro Takeshita, Alyssa Griffin, Kennedy Wolfe, Alina Szmant, Robert Whitehead, Rebecca Albright, Ken Caldeira
Global and local anthropogenic stressors such as climate change, acidification, overfishing, and pollution are expected to shift the benthic community composition of coral reefs from dominance by calcifying organisms to dominance by non‐calcifying algae. These changes could reduce the ability of coral reef ecosystems to maintain positive net calcium carbonate accretion. However, relationships between
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Carbon and nitrogen content to biovolume relationships for marine protist of the Rhizaria lineage (Radiolaria and Phaeodaria) Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-03-15 Joost Samir Mansour, Andreas Norlin, Natalia Llopis Monferrer, Stéphane L'Helguen, Fabrice Not
Rhizaria are large protistan cells that have been shown to be a major component of the planktic community in the oceans and contribute significantly to major biogeochemical cycles such as carbon or silicon. However, unlike for many other protists, limited data is available on rhizarian cellular carbon (C) and nitrogen (N) content and cell volume. Here we present novel C and N mass to volume equations
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Pore water exchange‐driven inorganic carbon export from intertidal salt marshes Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-03-11 Joseph J. Tamborski, Meagan Eagle, Barret L. Kurylyk, Kevin D. Kroeger, Zhaoihui Aleck Wang, Paul Henderson, Matthew A. Charette
Respiration in intertidal salt marshes generates dissolved inorganic carbon (DIC) that is exported to the coastal ocean by tidal exchange with the marsh platform. Understanding the link between physical drivers of water exchange and chemical flux is a key to constraining coastal wetland contributions to regional carbon budgets. The spatial and temporal (seasonal, annual) variability of marsh pore water
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Corrigendum Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-03-05
In [1], author Catarina V. Guerreiro's present address was listed as: MARE (Marine and Environmental Science Centre), Coimbra, Portugal. It should have been listed as: Marine and Environmental Sciences Centre (MARE), Faculty of Sciences of the University of Lisbon, Portugal. We apologize for this error. Reference Korte, L.F., Brummer, G.‐J.A., van der Does, M., Guerreiro, C.V., Mienis, F., Munday,
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Spatial variability of prokaryotic and viral abundances in the Kermadec and Atacama Trench regions Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-02-28 Clemens Schauberger, Mathias Middelboe, Morten Larsen, Logan M. Peoples, Douglas H. Bartlett, Finn Kirpekar, Ashley A. Rowden, Frank Wenzhöfer, Bo Thamdrup, Ronnie N. Glud
Hadal trenches represent the deepest part of the ocean and are dynamic depocenters with intensified prokaryotic activity. Here, we explored the distribution and drivers of prokaryotic and viral abundance from the ocean surface and 40 cm into sediments in two hadal trench regions with contrasting surface productivity. In the water column, prokaryotic and viral abundance decreased with water depth before
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Element cycling and aquatic function in a changing Arctic Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-02-25 Peter J. Hernes, Suzanne E. Tank, Mikael K. Sejr, Ronnie N. Glud
Arctic systems are under intense pressure from anthropogenic activities, with climate change in particular inducing rapid change in the interlinked cycling of water and various biogeochemical constituents, and thus also the ecological processes that depend on these cycles. This special issue for Limnology and Oceanography explores our changing Arctic, with contributions across the watershed‐lake‐r
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Toward a better understanding of fish‐based contribution to ocean carbon flux Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-02-17 Grace K. Saba, Adrian B. Burd, John P. Dunne, Santiago Hernández‐León, Angela H. Martin, Kenneth A. Rose, Joseph Salisbury, Deborah K. Steinberg, Clive N. Trueman, Rod W. Wilson, Stephanie E. Wilson
Fishes are the dominant vertebrates in the ocean, yet we know little of their contribution to carbon export flux at regional to global scales. We synthesize the existing information on fish‐based carbon flux in coastal and pelagic waters, identify gaps and challenges in measuring this flux and approaches to address them, and recommend research priorities. Based on our synthesis of passive (fecal pellet
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Remarkably high and consistent tolerance of a Red Sea coral to acute and chronic thermal stress exposures Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-02-15 Nicolas R. Evensen, Maoz Fine, Gabriela Perna, Christian R. Voolstra, Daniel J. Barshis
Global warming is resulting in unprecedented levels of coral mortality due to mass bleaching events and, more recently, marine heatwaves, where rapid increases in seawater temperature cause mortality within days. Here, we compare the response of a ubiquitous scleractinian coral, Stylophora pistillata, from the northern Red Sea to acute (7 h) and chronic (7–11 d) thermal stress events that include temperature
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Submarine groundwater discharge drives nitrous oxide source/sink dynamics in a metropolitan estuary Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-02-15 Michael J. Reading, Douglas R. Tait, Damien T. Maher, Luke C. Jeffrey, Rogger E. Correa, James P. Tucker, Haile A. Shishaye, Isaac R. Santos
Coastal waterways can be significant sources of the potent greenhouse gas nitrous oxide (N2O) due to nitrogen inputs and eutrophication. Here, we quantify groundwater derived N2O inputs and atmospheric emissions within a modified urban embayment (Sydney Harbour, Australia). Overall, we found low N2O saturation (91–171%) and air–water fluxes (−2.2 to 24.6 μmol m−2 d−1). Concentrations were highest in
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Preferential loss of Yukon River delta colored dissolved organic matter under nutrient replete conditions Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-02-15 J. Blake Clark, Antonio Mannino
The Yukon River exports a large amount of dissolved organic carbon (DOC), much of which is colored, absorbing visible and ultraviolet light. Yukon River water typically has low total dissolved nitrogen (TDN), with an average DOC : TDN ratio of 21.1 (mol C mol N−1) ~ 200 km upstream from the coast at Pilot Station, Alaska. TDN has been correlated to the bioavailability of DOC, but a direct estimate
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How hydrology and anthropogenic activity influence the molecular composition and export of dissolved organic matter: Observations along a large river continuum Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-02-11 Yongqiang Zhou, Xiaolong Yao, Lei Zhou, Zhonghua Zhao, Xiaolong Wang, Kyoung‐Soon Jang, Wei Tian, Yunlin Zhang, David C. Podgorski, Robert G. M. Spencer, Dolly N. Kothawala, Erik Jeppesen, Fengchang Wu
Large rivers are the main arteries for transportation of carbon to the ocean; yet, how hydrology and anthropogenic disturbances may change the composition and export of dissolved organic matter along large river continuums is largely unknown. The Yangtze River has a watershed area of 1.80 × 106 km2. It originates from the Qinghai‐Tibet Plateau and flows 6300 km eastward through the center of China
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Ecosystem metabolism in tropical streams and rivers: a review and synthesis Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-02-10 Nicholas S. Marzolf, Marcelo Ardón
Ecosystem metabolism of freshwater ecosystems has been studied for several decades, with theory and synthesis largely derived from temperate streams and rivers in North America and Europe. Advances in sensor technology and modeling have opened a wider range of streams to be included to test theories beyond temperate streams. In this paper, we review and synthesize ecosystem metabolism data from tropical
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Contributions of external nutrient loading and internal cycling to cyanobacterial bloom dynamics in Lake Taihu, China: Implications for nutrient management Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-02-04 Hai Xu, Mark J. McCarthy, Hans W. Paerl, Justin D. Brookes, Guangwei Zhu, Nathan S. Hall, Boqiang Qin, Yunlin Zhang, Mengyuan Zhu, Justyna J. Hampel, Silvia E. Newell, Wayne S. Gardner
Harmful cyanobacterial blooms (CyanoHABs) are linked to increasing anthropogenic nitrogen (N) and phosphorus (P) inputs. However, CyanoHABs in many large lakes continue despite extensive abatement efforts, mostly focused on external P loading. Internal nutrient cycling can modify nutrient availability and limitation; thus, understanding the relative importance of external vs. internal nutrient loading
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Persistence of bioconvection‐induced mixed layers in a stratified lake Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-02-03 Oscar Sepúlveda Steiner, Damien Bouffard, Alfred Wüest
In situ observations of biophysical interactions in natural waters typically focus on physical mechanisms influencing biological activity. Yet, biological activity can also drive physical processes in aquatic environments. A community of photoautotrophic, motile and heavy bacteria—Chromatium okenii, which requires light, sulfide, and anoxic conditions to perform anoxygenic photosynthesis, accumulates
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Daphnia depth selection in gradients of light intensity from different artificial sources: An evolutionary trap? Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-01-29 Piotr Maszczyk, Joanna Tałanda, Ewa Babkiewicz, Konrad Leniowski, Paulina Urban
It is well known that artificial light at night alters the natural patterns of light in space and time, which interrupts a variety of physiological processes of individuals, altering their life history and behavioral adjustments. However, much less is known about the effect of artificial light at night on their fitness. We tested the hypothesis that planktonic animals, such as Daphnia spp., are able
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Food source diversity, trophic plasticity, and omnivory enhance the stability of a shallow benthic food web from a high‐Arctic fjord exposed to freshwater inputs Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-01-28 Guillaume Bridier, Frédéric Olivier, Laurent Chauvaud, Mikael K. Sejr, Jacques Grall
Under climate change, many Arctic coastal ecosystems receive increasing amounts of freshwater, with ecological consequences that remain poorly understood. In this study, we investigated how freshwater inputs may affect the small‐scale structure of benthic food webs in a low‐production high‐Arctic fjord (Young Sound, NE Greenland). We seasonally sampled benthic invertebrates from two stations receiving
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Niche partitioning of low‐light adapted Prochlorococcus subecotypes across oceanographic gradients of the North Pacific Subtropical Front Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-01-28 Anne W. Thompson, Kathleen Kouba, Nathan A. Ahlgren
The cyanobacterium Prochlorococcus is the most abundant photosynthetic cell on Earth and contributes to global ocean carbon cycling and food webs. Prochlorococcus is known for its extensive diversity that falls into two groups of ecotypes, the low‐light (LL) and high‐light (HL) adapted ecotypes. Previous work has shown niche partitioning of the very abundant HL adapted ecotypes and subecotypes across
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Identification of dissolved organic matter size components in freshwater and marine environments Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-01-26 Eero Asmala, Philippe Massicotte, Jacob Carstensen
Dissolved organic matter (DOM) in the transition zone from freshwater to marine systems was analyzed with a new approach for parameterizing the size distribution of organic compounds. We used size‐exclusion chromatography for molecular size analysis and quantified colored DOM (CDOM) on samples from two coastal environments in the Baltic Sea (Roskilde Fjord, Denmark and Gulf of Gdansk, Poland). We applied
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The mangrove CO2 pump: Tidally driven pore‐water exchange Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-01-21 Xiaogang Chen, Isaac R. Santos, Mitchell Call, Gloria M. S. Reithmaier, Damien Maher, Ceylena Holloway, Praktan D. Wadnerkar, Paula Gómez‐Álvarez, Christian J. Sanders, Ling Li
Atmospheric carbon dioxide (CO2) is fixed by mangrove vegetation and stored in its biomass and sediments. Part of the sediment carbon can be exported to coastal waters via tidally driven pore‐water exchange. Here, we quantify pore water‐derived dissolved CO2 export using in situ, high‐resolution observations of 222Rn and CO2 over a spring‐neap tidal cycle in a mangrove‐fringed estuary (Coffs Creek
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Seasonal patterns in greenhouse gas emissions from lakes and ponds in a High Arctic polygonal landscape Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-01-20 Vilmantas Prėskienis, Isabelle Laurion, Frédéric Bouchard, Peter M. J. Douglas, Michael F. Billett, Daniel Fortier, Xiaomei Xu
Lakes and ponds can be hotspots for CO2 and CH4 emissions, but Arctic studies remain scarce. Here we present diffusive and ebullition fluxes collected over several years from 30 ponds and 4 lakes formed on an organic‐rich polygonal tundra landscape. Water body morphology strongly affects the mixing regime—and thus the seasonal patterns in gas emissions—with ice‐out and autumnal turnover periods identified
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Sea‐ice microbial communities in the Central Arctic Ocean: Limited responses to short‐term pCO2 perturbations Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-01-20 Anders Torstensson, Andrew R. Margolin, Gordon M. Showalter, Walker O. Smith, Elizabeth H. Shadwick, Shelly D. Carpenter, Francesco Bolinesi, Jody W. Deming
The Arctic Ocean is more susceptible to ocean acidification than other marine environments due to its weaker buffering capacity, while its cold surface water with relatively low salinity promotes atmospheric CO2 uptake. We studied how sea‐ice microbial communities in the central Arctic Ocean may be affected by changes in the carbonate system expected as a consequence of ocean acidification. In a series
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Historical contingency via priority effects counteracts environmental change on metacommunity dynamics across decades Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-01-20 Jorge García‐Girón, Marja Lindholm, Jani Heino, Heikki Toivonen, Janne Alahuhta
Community ecology has had a strong focus on single snapshots of species compositional variation in time. However, environmental change often occurs slowly at relatively broad spatio‐temporal scales, which requires historically explicit assessments of long‐term metacommunity dynamics, such as the order of species arrival during community assembly (i.e., priority effects), a theme that merits further
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Diatom response to alterations in upwelling and nutrient dynamics associated with climate forcing in the California Current System Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-01-20 Ivia Closset, Heather M. McNair, Mark A. Brzezinski, Jeffrey W. Krause, Kimberlee Thamatrakoln, Janice L. Jones
The California Current System displays a strong seasonal cycle in water properties, circulation, and biological production. Interactions of the alongshore current with coastal and topographic features lead to high spatial variability forced by seasonal winds that displace surface coastal water offshore. This process also supplies nutrients to the euphotic zone by Ekman transport and eventually supports
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Seasonal variability in planktonic food web structure and function of the Northeast U.S. Shelf Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-01-20 Pierre Marrec, Heather McNair, Gayantonia Franzè, Françoise Morison, Jacob P. Strock, Susanne Menden‐Deuer
Herbivorous consumption of primary production is a key transformation in global biogeochemical cycles, directing matter and energy either to higher trophic levels, export production, or remineralization. Grazing by microzooplankton is often poorly constrained, particularly in dynamic coastal systems. Temperate coastal areas are seasonally and spatially variable, which presents both challenges and opportunities
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Seasonality and biological forcing modify the diel frequency of nearshore pH extremes in a subarctic Alaskan estuary Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-01-20 Cale A. Miller, Amanda L. Kelley
Acidification in nearshore waters is influenced by a multitude of drivers that shape the dynamics of pH and carbonate chemistry variability on diurnal, seasonal, and yearly time scales. Monitoring efforts aimed at characterizing high temporal variability are lacking in many nearshore systems, particularly in high‐latitude regions such as Alaska. To rectify this, a nearshore acidification sensor array
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Potential foraminiferal nitrate transport in sediments in contact with oxic overlying water Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-01-15 Zhaomeng Xu, Sumei Liu, Xiaoyan Ning
Sedimentary denitrification accounts for more than half of the global marine fixed nitrogen loss, but this removal is often restricted by nitrate diffusive supply in sediments. The results of this study showed that foraminiferal nitrate transport may supply nitrate below the nitrate penetration depth and promote nitrogen removal in sediments in contact with oxic overlying water. Six dominant foraminiferal
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Trait‐based approach using in situ copepod images reveals contrasting ecological patterns across an Arctic ice melt zone Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-01-15 Laure Vilgrain, Frédéric Maps, Marc Picheral, Marcel Babin, Cyril Aubry, Jean‐Olivier Irisson, Sakina‐Dorothée Ayata
Imaging techniques are increasingly used in ecology studies, producing vast quantities of data. Inferring functional traits from individual images can provide original insights on ecosystem processes. Morphological traits are, as other functional traits, individual characteristics influencing an organism's fitness. We measured them from in situ image data to study an Arctic zooplankton community during
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Quantifying seasonal succession of phytoplankton trait‐environment associations in human‐altered landscapes Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-01-12 Charlie J. G. Loewen, Rolf D. Vinebrooke, Ron W. Zurawell
Integration of species traits in direct gradient analysis generates insights into how communities are assembled and may respond to environmental changes. We investigated phytoplankton trait‐environment relationships for over 300 taxa during the open‐water season across 75 north‐temperate lakes and reservoirs in Alberta, Canada. An innovative, data‐driven approach was applied using iterative model selection
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Corrigendum: Time‐varying responses of lake metabolism to light and temperature Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-01-08 Joseph S. Phillips
This corrigendum concerns the following manuscript: Phillips, JS. (2020) Time‐varying responses of lake metabolism to light and temperature. Limnology and Oceanography, 65(3), 652–666 doi.org/10.1002/lno.11333. The analysis reported in Phillips (2020) is based on a model of lake ecosystem metabolism, as inferred from water column dissolved oxygen data. The model accounts for exchange of oxygen with
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Evasive plankton: Size‐independent particle capture by ascidians Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-01-08 Yuval Jacobi, Noa Shenkar, J. Evan Ward, Maria Rosa, Guy Z. Ramon, Uri Shavit, Gitai Yahel
Direct measurements of the capture efficiency of planktonic cells by seven solitary ascidians were made in situ and in the laboratory and compared with the capture efficiency of polystyrene microspheres. The capture efficiency of the microspheres was significantly higher than that of planktonic cells over the entire tested size range (0.3–15 μm). Submicron polystyrene spheres with a surface modification
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Spatiotemporal variation in coral recruitment and its association with seawater temperature Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-01-08 Peter J. Edmunds
The supply of propagules mediates recruitment and population dynamics, thereby driving community resilience following disturbances. These relationships are of interest on tropical reefs, where coral populations have drastically declined in abundance and sexual recruitment is the only means by which they will recover. To better understand the causes and implications of variation in this vital rate (i
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New insights into the biogeochemical cycling of copper in the subarctic Pacific: Distributions, size fractionation, and organic complexation Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-01-08 Kuo Hong Wong, Hajime Obata, Taejin Kim, Yoshiko Kondo, Jun Nishioka
The chemical speciation of Cu is dominated by complexation with organic ligands. However, the size fractionation of dissolved Cu and its organic ligands are not well understood. In this study, we revealed new insights into the biogeochemical cycling of Cu in the subarctic Pacific based on both chemical speciation and size fractionation analyses. Our data show that the surface waters of the subarctic
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Conceptual uncertainties in groundwater and porewater fluxes estimated by radon and radium mass balances Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-01-08 Valentí Rodellas, Thomas C. Stieglitz, Joseph J. Tamborski, Pieter van Beek, Aladin Andrisoa, Peter G. Cook
Radium isotopes and radon are routinely used as tracers to quantify groundwater and porewater fluxes into coastal and freshwater systems. However, uncertainties associated with the determination of the tracer flux are often poorly addressed and often neglect all the potential errors associated with the conceptualization of the system (i.e., conceptual uncertainties). In this study, we assess the magnitude
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The commonality of core biological groups across freshwater food webs Limnol. Oceanogr. (IF 3.778) Pub Date : 2021-01-06 Fernando Miranda Lansac‐Tôha, Bárbara Angélio Quirino, Yasmin Rodrigues Souza, Fábio Amodêo Lansac‐Tôha, Luiz Felipe Machado Velho, Matheus Tenório Baumgartner
Assessing how organisms interact is fundamental to understand biodiversity patterns. Like many ecosystems, most freshwater environments are susceptible to spatial and temporal variations, especially floodplains. In spite of the expected variability, the structure of interactions in food webs is a paramount aspect to uncover processes related to ecosystem functioning. Here, we surveyed four large floodplains
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Arctic concentration–discharge relationships for dissolved organic carbon and nitrate vary with landscape and season Limnol. Oceanogr. (IF 3.778) Pub Date : 2020-12-31 Arial J. Shogren, Jay P. Zarnetske, Benjamin W. Abbott, Frances Iannucci, Alexander Medvedeff, Sam Cairns, Megan J. Duda, William B. Bowden
Climate change is intensifying the Arctic hydrologic cycle, potentially accelerating the release of carbon and nutrients from permafrost landscapes to rivers. However, there are limited riverine flow and solute data of adequate frequency and duration to test how seasonality and catchment landscape characteristics influence production and transport of carbon and nutrients in Arctic river networks. We
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Comparing microbial composition and diversity in freshwater lakes between Greenland and the Tibetan Plateau Limnol. Oceanogr. (IF 3.778) Pub Date : 2020-12-31 Peng Xing, Ye Tao, Erik Jeppesen, Qinglong L. Wu
Greenland and the Tibetan Plateau, also known as the third pole, are both cold environments where anthropogenic activities are relatively weak. There are multitudinous lakes in both regions, especially in Greenland, where small water bodies are continuously created as glaciers retreat. It is unclear whether the community structure and community assembly mechanisms of these water bodies are consistent
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Nitrification and nitrous oxide dynamics in the Southern California Bight Limnol. Oceanogr. (IF 3.778) Pub Date : 2020-12-31 Sarah M. Laperriere, Michael Morando, Douglas G. Capone, Troy Gunderson, Jason M. Smith, Alyson E. Santoro
The amount of primary production fueled by upwelled “new” nitrate can be used to estimate the amount of organic carbon available for export to the deep ocean. Nitrate production in the euphotic zone from the microbial process of nitrification affects these estimates, yet the controls on nitrification in the upper ocean are debated. This study examines how seasonal cycles in primary production influence
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Thresholds in catchment nitrogen load for shifts from seagrass to nuisance macroalgae in shallow intertidal estuaries Limnol. Oceanogr. (IF 3.778) Pub Date : 2020-12-31 Ben P Robertson, Candida Savage
Eutrophication of shallow coastal ecosystems often manifests as dense mats of opportunistic macroalgae, degraded underlying sediments and displacement of ecologically important primary producers including seagrass beds. Ecological thresholds of drivers that cause these shifts in ecosystem state are needed to manage eutrophication symptoms before tipping points are crossed. This study quantifies total
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