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Fine‐grained sediment production by endolithic sponges on Caribbean coral reefs Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-07-25 Didier M. de Bakker, Chris T. Perry, Eden Magaña‐Gallegos, Esmeralda Pérez‐Cervantes, Lorenzo Alvarez‐Filip
Endolithic sponges are key players in carbonate cycling on coral reef systems. While their bioerosion of reef framework is relatively well studied, their role in biogenic sediment generation is poorly understood. In this study, the sedimentary attributes and production rates of eight Caribbean endolithic sponge species were characterized. The findings revealed notable species‐specific variations in
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Resolving abrupt frontal gradients in zooplankton community composition and marine snow fields with an autonomous Zooglider Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-07-24 Sven Gastauer, Mark D. Ohman
An autonomous Zooglider navigated across the California Current Front into low salinity, minty waters characteristic of the California Current proper in both summers of 2019 and 2021. Diving to 400 m depth, Zooglider transited another near‐surface frontal gradient somewhat inshore. These frontal gradients were generally associated with changes in intensity, size composition, and Diel Vertical Migration
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Hidden seafloor hypoxia in coastal waters Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-07-23 Jonas Patrik Fredriksson, Karl Attard, Christian Stranne, Inga Monika Koszalka, Ronnie N. Glud, Thorbjørn Joest Andersen, Christoph Humborg, Volker Brüchert
The expansion of transient and permanent coastal benthic anoxia is one of the most severe problems for the coastal ocean globally. We report frequent, hidden hypoxia in the bottom 5 cm of the water column of a coastal site in the central Baltic Sea by continuous high‐resolution profiling of oxygen (O2) directly above the sediment surface. This hypoxia stood in stark contrast to 30‐yr O2 monitoring
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Colony‐forming and single‐cell picocyanobacteria nitrogen acquisition strategies and carbon fixation in the brackish Baltic Sea Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-07-23 Christien P. Laber, Javier Alegria Zufia, Catherine Legrand, Elin Lindehoff, Hanna Farnelid
Picocyanobacteria are widespread and globally significant primary producers. In brackish waters, picocyanobacterial populations are composed of diverse species with both single‐cell and colony‐forming lifestyles. Compared to their marine counterparts, brackish picocyanobacteria are less well characterized and the focus of research has been weighted toward single‐cell picocyanobacteria. Here, we investigate
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Migrating ripples create streambed heterogeneity altering microbial diversity and metabolic activity Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-07-22 Anna Oprei, José Schreckinger, Norbert Kamjunke, Anja Worrich, Michael Mutz, Ute Risse‐Buhl
Sandy sediments of lowland streams are typically transported at low flow in the form of migrating ripples. In these bedforms, microbial communities spanning all trophic guilds (heterotrophic bacteria, fungi, photoautotrophic and phagotrophic protists) are exposed to highly frequent moving–resting cycles of sediment grains. Up to date, it is unknown to what extent ripple migration impacts community
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Zooplankton grazing reduces the persistence of an anthropogenic pollution marker in lake water Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-07-22 Giulia Borgomaneiro, Andrea Di Cesare, Cristiana Callieri, Gianluca Corno, Diego Fontaneto, Roberta Piscia, Ester M. Eckert
Wastewater treatment plant effluents release microbiological pollutants, including the intI1 gene (integrases of class 1 integron), which has been proposed as a target for monitoring anthropogenic pollution in surface waters. This gene correlates with antibiotic resistance genes, making it an important proxy for genetic contamination in aquatic environments. It is currently unclear whether intI1 found
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Seafloor bioturbation intensity on the deep sea: More complex than organic matter Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-07-20 Olmo Miguez‐Salas, Hanieh Saeedi, Angelika Brandt, Torben Riehl
Deep‐sea benthic communities are strongly controlled by the quantity and quality of organic matter sinking from the ocean surface. The interaction between benthic fauna and seafloor sediments mainly occurs through bioturbation that modifies substrate properties (e.g., geochemical profiles). The intensity of the bioturbation has long been linked with organic matter and measured as a diffusive process
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Organic matter accumulation drives methylotrophic methanogenesis and microbial ecology in a hypersaline coastal lagoon Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-07-20 Christopher Keneally, Matilda Southgate, Daniel Chilton, Virginie Gaget, David T. Welsh, Luke Mosley, Dirk V. Erler, Stephen P. Kidd, Justin Brookes
Hypersalinity is common in coastal wetlands throughout warm, tropical, and arid regions. Climate‐induced changes in rainfall, sea level, and anthropogenic modification to basins and coastlines are likely to further increase salinization in these ecosystems. Yet, carbon cycling in hypersaline coastal wetlands is not well understood, and poorly constrained in climate models. In the Coorong, a eutrophic
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Different temperature sensitivities of key physiological processes lead to divergent trait response patterns in Arctic phytoplankton Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-07-19 Linda Rehder, Sebastian D. Rokitta, Clara J. M. Hoppe, Isabelle Buschmann, Levke Jasper, Björn Rost
Ocean warming is especially pronounced in the Arctic, and phytoplankton will face thermodynamically driven changes in their physiology, potentially pushing them beyond their thermal optimum. We assessed temperature responses of multiple functional traits over their entire thermal window (growth rates, quotas of particulate organic carbon, nitrogen, and chlorophyll a, as well as photophysiological parameters)
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A sequence of weather‐driven hydrodynamic events stimulates the formation of harmful algal blooms on an oligotrophic lake Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-07-18 Michael R. Kelly, Vincent W. Moriarty, Harry R. Kolar, Guillaume A. R. Auger, Michael E. Henderson, Campbell D. Watson, Rick A. Relyea, Christopher A. Scholz, Charles T. Driscoll, Kevin C. Rose
Harmful algal blooms (HABs) are common in many eutrophic lakes and frequently associated with nutrient excesses, warm waters, and calm conditions. While HABs can also occur in oligotrophic waterbodies, bloom‐stimulating factors remain elusive for these ecosystems. Here, using a high‐frequency sensor platform supported by hydrodynamic modeling, we document a clearly linked sequence of three hydrodynamic
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Transport and reactivity of nitrous oxide and methane in two contrasting subterranean estuaries Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-07-15 Elisa Calvo‐Martin, Mercedes de la Paz, Xosé Antón Álvarez‐Salgado, María José Pazó Fernández, Vanesa Vieitez Dos Santos, J. Severino P. Ibánhez
Continental groundwaters are commonly enriched in nitrous oxide (N2O) and methane (CH4), which can discharge into the coast. The contribution of this diffuse source to coastal N2O and CH4 emissions largely depends on the biogeochemical processes of coastal aquifer exit zones, known as subterranean estuaries. Here, we study the role of subterranean estuaries in modulating N2O and CH4 exports toward
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Concurrent DNA meta‐barcoding and plankton imaging reveal novel parasitic infection and competition in a diatom Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-07-13 Dylan Catlett, Emily E. Peacock, Diana N. Fontaine, Emily T. Crockford, Mary J. McKenzie, Tatiana A. Rynearson, Heidi M. Sosik
Little is known about diatom parasitism in marine systems. Guinardia delicatula, a biomass‐dominant diatom on the Northeast US Shelf (NES), is regularly parasitized by the protistan nanoflagellate, Cryothecomonas aestivalis in this region. While G. delicatula is known to host other protistan parasites, direct observation of these interactions and their dynamics in nature remain elusive. Here, we integrate
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The experimental implications of the rate of temperature change and timing of nutrient availability on growth and stoichiometry of a natural marine phytoplankton community Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-07-09 Anika Happe, Antonia Ahme, Marco J. Cabrerizo, Miriam Gerhard, Uwe John, Maren Striebel
Climate change increases the need to understand the effect of predicted future temperature and nutrient scenarios on marine phytoplankton. However, experimental studies addressing the effects of both drivers use a variety of design approaches regarding their temperature change rate and nutrient supply regimes. This study combines a systematic literature map to identify the existing bias in the experimental
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Strain‐dependent and host genotype–dependent priority effects in gut microbiome assembly affect host fitness in Daphnia Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-07-08 Aditi Gurung, Shinjini Mukherjee, Maj Declercq, Caroline Souffreau, Luc De Meester
The arrival order of species can strongly influence the early assembly of ecological communities. Such events, known as priority effects, are documented in various ecological settings, but remain understudied within the context of the gut microbiome. Given the fundamental link between the gut microbiome and host health, exploring the potential role of priority effects in shaping the assembly and development
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First lacustrine application of the diatom‐bound nitrogen isotope paleo‐proxy reveals coupling of denitrification and N2 fixation in a hyper‐eutrophic lake Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-07-08 Anja S. Studer, Lars Wörmer, Hendrik Vogel, Nathalie Dubois, Maciej Bartosiewicz, Kai‐Uwe Hinrichs, Fabio Lepori, Moritz F. Lehmann
Past changes in the input/output, and internal cycling, of bioavailable nitrogen (N) in marine and lacustrine environments can be reconstructed by analyzing the N isotopic composition (δ15N) of organic matter in the sedimentary record. To verify, and eliminate, potential biases of bulk sedimentary δ15N (δ15Nbulk) signatures by diagenetic alteration and external N inputs, we applied, for the first time
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Dynamics of alongshore current in the Taiwan Strait: A perspective on the southward Kuroshio branch in winter Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-07-06 Xiaolong Zong, Zhong Sheng, Shuwen Zhang, Aijun Wang, Fangjing Deng, Qiang Wang, Zhaoyun Chen
In winter, the Kuroshio Current intrudes onto the continental shelf in the East China Sea with a cyclonic branch occasionally veering northeast of the Taiwan Strait. The dynamic process and mechanism by which the southward Kuroshio branch enters the Taiwan Strait is investigated using a numerical model. Decomposition of the flow field and sea surface height (SSH) using the empirical orthogonal function
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Determination of site‐specific nitrogen cycle reaction kinetics allows accurate simulation of in situ nitrogen transformation rates in a large North American estuary Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-07-06 Weiyi Tang, Samantha G. Fortin, Naomi Intrator, Jenna A. Lee, Moriah A. Kunes, Amal Jayakumar, Bess B. Ward
Nitrogen (N) bioavailability affects phytoplankton growth and primary production in the aquatic environment. N bioavailability is partly determined by biological N cycling processes that either transform N species or remove fixed N. Reliable estimates of their kinetic parameters can help understand the distribution of N cycling processes. However, available estimates of kinetic parameters are often
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Winter convective mixing regulates oceanic C : N : P ratios Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-07-06 Deepika Sahoo, Himanshu Saxena, Sipai Nazirahmed, Mohammad Atif Khan, Deepak Kumar Rai, Niharika Sharma, Sebin John, Sanjeev Kumar, A. K. Sudheer, Ravi Bhushan, Arvind Singh
Recent studies have challenged the validity of the Redfield ratio. It is proposed that physical and biogeochemical processes govern the geographical variations in carbon : nitrogen : phosphorus (C : N : P) ratios. However, this proposal remains to be examined through concurrent observations of C : N : P ratios with physical and biogeochemical processes in various marine reservoirs. Here, we sampled
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Scaling of respiration in colonial invertebrates Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-07-06 Patrick D. Brown, Elizabeth J. Walsh
Coloniality may grant colony members an energetic advantage in the form of lower individual respiration rates as colony size increases. If this occurs it should be apparent as negative allometric scaling of respiration with colony size, and colonial organisms should have scaling factors < 1. However, colonial members from phylum Rotifera have yet to be examined. To test if colonial rotifers possess
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Ecological and functional niches comparison reveals differentiated resource‐use strategies and ecological thresholds in four key floating‐leaved macrophytes Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-07-04 Alice Dalla Vecchia, Maria Beatrice Castellani, Mattia Martin Azzella, Rossano Bolpagni
Niche theory has been widely used in ecology; however, few studies have attempted to combine information on functional and ecological niches (i.e., variation in traits and environmental requirements), especially for freshwater macrophytes. In this study, we aim to describe the functional and ecological niches of four key nymphaeid species (Nuphar lutea, Nymphaea alba, Nelumbo nucifera, and Nymphoides
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Changes to upper‐ocean ecosystems may directly impact abyssal scavenger communities Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-07-04 Daniëlle S. W. de Jonge, Alycia J. Smith, Andrew K. Sweetman
Human pressures are changing ocean environments, such as a shift from fish‐ to squid‐dominated ecosystems in overfished, poorly oxygenated environments. After death, carcasses of upper ocean fauna sink to the seafloor where they provide food for demersal scavengers. It is unclear how shifts in carcass type impact abyssal scavengers. We performed baited benthic camera lander deployments in the Cabo
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Invertebrate trophic structure on marine ferromanganese and phosphorite hardgrounds Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-07-03 Olívia S. Pereira, Devin Vlach, Angelica Bradley, Jennifer Gonzalez, Kira Mizell, Lisa A. Levin
The Southern California Borderland hosts a variety of geologic and oceanographic features that allow for diverse habitats to occur in a restricted region with a strong oxygen minimum zone (OMZ) and hard substrates. These include ferromanganese (FeMn) crusts and phosphorites targeted for deep‐seabed mining in other regions. Baseline studies regarding hardground macro‐ (> 0.3 mm) and megafaunal (> 2
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CO2‐induced seawater acidification impairs the stinging cells of a jellyfish Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-07-03 Tingting Sun, Yongxue Li, Saijun Peng, Fanghan Wang, Lei Wang, Jianmin Zhao, Zhijun Dong
CO2‐induced seawater acidification has been shown to modify predator–prey interactions in many marine taxa. Scyphozoans play an important role in the trophic dynamics of marine ecosystems during their blooms in coastal waters; however, the impacts of seawater acidification on the predation behavior of these animals are poorly understood. Here, we aimed to examine the impact of a decrease in seawater
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Phytoplankton biomass responses to a marine heat wave align with altered nitracline depth Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-07-03 Michael R. Landry, Alexandra L. Freibott, Jennifer L. Beatty, Karen E. Selph
The 2014–2015 warm anomaly (aka “the Blob”), the largest of periodic and intensifying marine heat wave (MHW) perturbations in the northeast Pacific, may provide some insight about the future warmer ocean. Here, we use mixed‐layer carbon estimates for total phytoplankton, major size classes and functional groups from 45 CalCOFI cruises to: (1) compare 2014–2015 MHW impacts in the southern California
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Temperature, water travel time, and dissolved organic matter structure river microbial communities in a large temperate watershed Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-06-29 Ted Bambakidis, Byron C. Crump, Byungman Yoon, Ethan D. Kyzivat, Kelly S. Aho, Charles F. Leal, Jennifer H. Fair, Aron Stubbins, Sasha Wagner, Peter A. Raymond, Jacob D. Hosen
There is growing evidence that the composition of river microbial communities gradually transitions from terrestrial taxa in headwaters to unique planktonic and biofilm taxa downstream. Yet, little is known about fundamental controls on this community transition across scales in river networks. We hypothesized that community composition is controlled by flow‐weighted travel time of water, in combination
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Seagrass ecosystem recovery: Experimental removal and synthesis of disturbance studies Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-06-28 Spencer J. Tassone, Carolyn J. Ewers Lewis, Karen J. McGlathery, Michael L. Pace
Net global losses of seagrasses have accelerated efforts to understand recovery from disturbances. Stressors causing disturbances (e.g., storms, heatwaves, boating) vary temporally and spatially within meadows potentially affecting recovery. To test differential recovery, we conducted a removal experiment at sites that differed in thermal stress for a temperate seagrass (Zostera marina). We also synthesized
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Fatty acid composition as a function of latitude in barnacle cyprid larvae Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-06-27 Inês Leal, Jakob Thyrring, Augusto A. V. Flores, Philippe Archambault, Rachel Collin, Mikael K. Sejr, Ricardo A. Scrosati, Réjean Tremblay
Broadly distributed species need to perform well in a range of environmental conditions, but knowledge of how wide‐ranging marine larvae perform along latitudinal gradients remains limited. The fatty acid composition of larvae is important for their physiological responses to changing conditions. Here, we investigated the fatty acid composition of the last, non‐feeding stage of barnacle larvae (cyprids)
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Nutrient limitation dampens the response of a harmful algae to a marine heatwave in an upwelling system Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-06-27 Alexis D. Fischer, Emilie Houliez, Brian D. Bill, Maria T. Kavanaugh, Simone R. Alin, Andrew U. Collins, Raphael M. Kudela, Stephanie K. Moore
Harmful algal blooms caused by toxin‐producing species of the diatom genus Pseudo‐nitzschia have been linked to anomalously warm ocean conditions in the Northern California Current System. This study compares summertime concentrations of Pseudo‐nitzschia spp. and the toxin they produce, domoic acid, during a marine heatwave year (2019) and a climatologically neutral year (2021). An Imaging FlowCytobot
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Viral infection of coccolithophore host induces shifts in particulate organic matter stoichiometry Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-06-27 Tamar Dikstein, Gilad Antler, André Pellerin, Shlomit Sharoni, Miguel J. Frada
Blooms of the coccolithophore Gephyrocapsa huxleyi (formerly Emiliania huxleyi) are routinely infected by a specific lytic virus (EhV) that kills host cells and drives bloom termination. However, the impact of EhV on nutrient retention and stoichiometric ratios of particulate organic matter remains unknown, limiting our current understanding of the biogeochemical significance of the G. huxleyi–EhV
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Photosynthetic processes in Antarctic sea ice during the spring melt Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-06-26 Jodi N. Young, Susan Rundell, Zachary S. Cooper, Hannah M. Dawson, Shelly D. Carpenter, Thomas Ryan‐Keogh, Elden Rowland, Erin M. Bertrand, Jody W. Deming
High‐latitude oceans experience strong seasonality where low light limits photosynthetic activity most of the year. This limitation is pronounced for algae within and underlying sea ice, and these algae are uniquely acclimated to low light levels. During spring melt, however, light intensity and daylength increase drastically, triggering blooms of ice algae that play important roles in carbon cycling
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Anoxic waters constrain the vertical distribution of fish developmental stages in an oxygen minimum zone Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-06-25 Juan Gerardo Gutiérrez‐Bravo, Laura Sánchez‐Velasco, Sylvia Patricia Adelheid Jiménez‐Rosenberg, Mark A. Altabet, Sofia Méndez‐Mendez, Sergio Cambronero‐Solano
In the Eastern Tropical North Pacific Oxygen Minimum Zone (ETNP‐OMZ), fish larvae undergo development amidst highly variable dissolved oxygen environments. As OMZs expand, understanding the implications of low‐oxygen environments on fish development becomes increasingly relevant for fisheries management and ecosystem modeling. Using horizontal zooplankton tows to track five oxygen levels (oxic [200
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Zooplankton fecal pellet flux drives the biological carbon pump during the winter–spring transition in a high‐Arctic system Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-06-25 Gérald Darnis, Maxime Geoffroy, Malin Daase, Catherine Lalande, Janne E. Søreide, Eva Leu, Paul E. Renaud, Jørgen Berge
Recent research highlighted significant marine biological activity during the Arctic winter, with poorly known implications for the biological carbon pump. We used moored instruments to (1) track the development of the pelagic food web of a high‐Arctic marine ecosystem from winter to spring, and (2) assess the role of zooplankton‐mediated processes in the sinking export of particulate organic carbon
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Food quantity and quality modulates inducible defenses in a common predator–prey system Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-06-25 Marvin Kiene, Matthias Schott, Dominik Martin‐Creuzburg, Christian Laforsch
Zooplankton displays different inducible defenses against invertebrate and vertebrate predators. The response pattern to gape‐limited invertebrate predators involves increased somatic growth and offspring body size but delayed maturity and reduced offspring numbers. In contrast to this general pattern, the freshwater model organism Daphnia magna has been reported to exhibit a different response when
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Holistic optical water type classification for ocean, coastal, and inland waters Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-06-25 Shun Bi, Martin Hieronymi
Water constituents exhibit diverse optical properties across ocean, coastal, and inland waters, which alter their remote‐sensing reflectance obtained via satellites. Optical water type (OWT) classifications utilized in satellite data processing aim to mitigate optical complexity by identifying fitting ocean color algorithms tailored to each water type. This facilitates comprehension of biogeochemical
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Quantifying spatial complexity in submerged aquatic vegetation landscapes using remote sensing: Lessons from simulated and real landscapes Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-06-25 Arthur de Grandpré, Christophe Kinnard, Andrea Bertolo
The spatial organization of vegetation has been shown to be a strong indicator of ecological state in multiple ecosystems. In this study, we analyze the relationships between spatial complexity metrics in submerged aquatic vegetation (SAV) landscapes, and we explore the potential of satellite remote sensing to quantify these metrics in submerged environments. To do so, we estimated an array of complexity
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Total alkalinity change: The perspective of phytoplankton stoichiometry Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-06-25 Dieter A. Wolf‐Gladrow, Christine Klaas
Many biogeochemical processes change total alkalinity: this has been reported for carbonate precipitation and dissolution, uptake and release of various nitrogen‐containing compounds, uptake of phosphate, sulfate reduction combined with methane oxidation. However, the list is not exhaustive. Here we discuss additional processes, namely the uptake of Mg, K, Ca by phytoplankton, and calculate their contribution
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Multi‐omics analyses reveal the signatures of metabolite transfers across trophic levels in a high‐CO2 ocean Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-06-25 Mengcheng Ye, Jiale Zhang, Mengting Xiao, Jiali Huang, Yunyue Zhou, John Beardall, John A. Raven, Guang Gao, Xiao Liang, Fenghuang Wu, Baoyi Peng, Leyao Xu, Yucong Lu, Shiman Liang, Yipeng Wang, Hao Zhang, Jingyao Li, Ling Cheng, Zuoxi Ruan, Jianrong Xia, Peng Jin
Although the diverse impacts of elevated dissolved CO2 and warming on organisms within various trophic levels in marine food webs are well documented, we have yet to explore the biological links across different levels of biological organization from primary producers to secondary producers on an evolutionary time scale in a high‐CO2 ocean. Here, we cultured a model marine diatom Phaeodactylum tricornutum
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Spectrophotometrically derived seawater CO2‐system assessments: Parameter calculations using pH do not require measurements at standard temperatures Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-06-25 Katelyn M. Schockman, Robert H. Byrne, Brendan R. Carter, Richard A. Feely
The temperature range of Earth's open‐ocean waters is roughly 0–30°C, yet our understanding of the seawater carbon dioxide (CO2) system is largely derived from analyses conducted within a narrow temperature range (e.g., laboratory temperature of 20°C or 25°C). Herein, we address two aspects of open‐ocean CO2‐system measurements and modeling: (1) a highly precise spectrophotometric technique is used
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Strong marine heatwaves trigger flowering in seagrass Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-06-25 Catalina A. García‐Escudero, Victoria Litsi‐Mizan, Pavlos T. Efthymiadis, Vasilis Gerakaris, Oscar Serrano, Eugenia T. Apostolaki
In recent decades, the global intensification of marine heatwaves has impacted several ecosystems and species, including the endemic Mediterranean seagrass Posidonia oceanica. However, the scarcity of research in Eastern Mediterranean meadows, where historical and present thermal conditions differ from those of the Western Mediterranean, hampers our ability to draw comprehensive conclusions regarding
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The effect of vorticity on the feeding of a freshwater grazer Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-05-21 Luc Goulet, Warren Joseph Sproule Currie, Josef Daniel Ackerman
The transfer of energy through zooplankton grazing on phytoplankton is one of the most important interactions in aquatic ecosystems, yet the role of hydrodynamic forces is not fully understood. Factors that influence these interactions include algal size and shape and the interactions between grazer and alga dictated by hydrodynamic forces. Hydrodynamic forcing lead to unimodal relationships in grazer
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In situ aerobic methane oxidation rates in a stratified lake Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-05-18 Zachary W. Hudspeth, Joshua L. Morningstar, Howard P. Mendlovitz, Jennifer A. Baily, Karen G. Lloyd, Christopher S. Martens
Microbial aerobic methane oxidation is an important sink for aquatic methane worldwide. Despite its importance to global methane fluxes, few aerobic methane oxidation rates have been obtained in freshwater or marine environments without imposing changes to the microbial community through use of ex situ methods. A novel in situ incubation method for continuous time‐series measurements was used in Jordan
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Sight and blindness: The relationship between ostracod eyes, water depth, and light availability in the Arctic Ocean Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-05-16 Jingwen Zhang, Moriaki Yasuhara, Chih‐Lin Wei, Skye Yunshu Tian, Kyawt K. T. Aye, Laura Gemery, Thomas M. Cronin, Peter Frenzel, David J. Horne
Eye loss has been a long‐standing interest in evolutionary biology. Many organisms that inhabit environments without light penetration, for example the deep sea, exhibit eye loss and thus become blind. However, water‐depth distribution of eyes in marine organisms is poorly understood. Ostracods are widely distributed crustaceans, and many sighted marine ostracods have eye tubercles (lenses) on their
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Pan‐Arctic distribution modeling reveals climate‐change‐driven poleward shifts of major gelatinous zooplankton species Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-05-15 Dmitrii Pantiukhin, Gerlien Verhaegen, Charlotte Havermans
Anthropogenic activities, including climate change, are hypothesized to cause increases in gelatinous zooplankton population sizes and blooms. In the most rapidly changing ecosystem, the Arctic Ocean, this hypothesis has not yet been verified, and gelatinous zooplankton is commonly excluded from large‐scale modeling studies. Our modeling study is based on an extensive biogeographic dataset, aggregating
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High rates of erosion on a wave‐exposed fringing coral reef Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-05-14 Damian P. Thomson, Shannon Dee, Christopher Doropoulos, Melanie Orr, Shaun K. Wilson, Andrew S. Hoey
Erosion is a key process in shaping the physical structure of coral reefs, yet due to erosion being semi‐cryptic and difficult to quantify, information remains limited. Here, we investigate erosional processes along Ningaloo Reef, an extensive fringing coral reef in Western Australia. We employed both direct and indirect methods to measure erosion in wave‐exposed reef slopes and protected lagoonal
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Seasonality of submarine groundwater discharge to an Arctic coastal lagoon Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-05-13 Emma J. Bullock, Isabel V. Schaal, M. Bayani Cardenas, James W. McClelland, Paul B. Henderson, Matthew A. Charette
Supra‐permafrost submarine groundwater discharge (SGD) in the Arctic is potentially important for coastal biogeochemistry and will likely increase over the coming decades owing to climate change. Despite this, land‐to‐ocean material fluxes via SGD in Arctic environments have seldom been quantified. This study used radium (Ra) isotopes to quantify SGD fluxes to an Arctic coastal lagoon (Simpson Lagoon
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Intraspecific genetic diversity and coexistence in phytoplankton populations Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-05-04 Fredrik Ryderheim, Thomas Kiørboe
The past two decades have seen a drastic increase in the availability and use of genetic techniques to study phytoplankton communities. As a result, it is now well documented that phytoplankton populations are genetically diverse, despite predominantly asexual reproduction and minute morphological variation. Genetic variation can lead to variation also in phenotype, and some traits vary more among
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Predicting river phytoplankton blooms and community succession using ecological niche modeling Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-05-04 Michael J. Bowes, Michael G. Hutchins, David J. E. Nicholls, Linda K. Armstrong, Peter M. Scarlett, Monika D. Jürgens, Nuria Bachiller‐Jareno, Isabelle Fournier, Daniel S. Read
Excessive phytoplankton concentrations in rivers can result in the loss of plant and invertebrate communities, and threaten drinking water supplies. Whilst the physicochemical controls on algal blooms have been identified previously, how these factors combine to control the initiation, size, and cessation of blooms in rivers is not well understood. We applied flow cytometry to quantify diatom, chlorophyte
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Effects of bottom‐up factors on growth and toxin content of a harmful algae bloom dinoflagellate Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-05-01 Kristof Möller, Silke Thoms, Urban Tillmann, Bernd Krock, Florian Koch, Ilka Peeken, Cédric L. Meunier
The toxin‐producing dinoflagellate Alexandrium pseudogonyaulax has become increasingly abundant in northern European waters, replacing other Alexandrium species. A. pseudogonyaulax produces goniodomins and lytic substances, which can be cytotoxic toward other organisms, including fish, but we still know little about the environmental conditions influencing its growth and toxicity. Here, we investigated
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Ubiquitous but unique: Water depth and oceanographic attributes shape methane seep communities Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-05-01 Sarah Seabrook, Marta E. Torres, Tamara Baumberger, David Butterfield, Kevin Roe, Milo Cummings, Rebecca Crawford, Andrew R. Thurber
In the past decade, thousands of previously unknown methane seeps have been identified on continental margins around the world. As we have come to appreciate methane seep habitats to be abundant components of marine ecosystems, we have also realized they are highly dynamic in nature. With a focus on discrete depth ranges across the Cascadia Margin, we work to further unravel the drivers of seep‐associated
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Does nutrient enrichment alleviate stoichiometric constraint on plankton trophic structure? Limnol. Oceanogr. (IF 3.8) Pub Date : 2024-04-30 Qiuqi Lin, Lingli Liu, Zheng Gong, Liang Peng
Stoichiometric mismatch between phytoplankton and zooplankton has implication for trophic transfer efficiency. Phosphorus (P) enrichment is expected to lower phytoplankton carbon (C) to P ratio (C : P) and thereby either alleviate P deficiency or induce excess P for zooplankton. However, the generality of zooplankton facing excess P and its effect on plankton trophic structure in natural systems are