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Seasonal patterns of microbial diversity across the world oceans Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-07-17 Eric J. Raes, Shannon Myles, Liam MacNeil, Matthias Wietz, Christina Bienhold, Karen Tait, Paul J. Somerfield, Andrew Bissett, Jodie van de Kamp, Josep M. Gasol, Ramon Massana, Yi‐Chun Yeh, Jed A. Fuhrman, Julie LaRoche
Understanding the patterns of marine microbial diversity (Bacteria + Archaea) is essential, as variations in their alpha‐ and beta‐diversities can affect ecological processes. Investigations of microbial diversity from global oceanographic expeditions and basin‐wide transects show positive correlations between microbial diversity and either temperature or productivity, but these studies rarely captured
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Adaptive traits of Planctomycetota bacteria to thrive in macroalgal habitats and establish mutually beneficial relationship with macroalgae Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-07-10 Xueyan Gao, Yihua Xiao, Ziwei Wang, Hanshuang Zhao, Yufei Yue, Shailesh Nair, Zenghu Zhang, Yongyu Zhang
Bacteria and macroalgae share an inseparable relationship, jointly influencing coastal ecosystems. Within macroalgae habitats, Planctomycetota, a group of bacteria notoriously challenging to cultivate, often dominate. However, the mechanisms facilitating their persistence in this environment remain unclear. Here, we successfully isolated a novel Planctomycetota bacterium, Stieleria sp. HD01, from the
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Tracking a large‐scale and highly toxic Arctic algal bloom: Rapid detection and risk communication Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-07-10 Evangeline Fachon, Robert S. Pickart, Gay Sheffield, Emma Pate, Mrunmayee Pathare, Michael L. Brosnahan, Eric Muhlbach, Kali Horn, Nathaniel N. Spada, Anushka Rajagopalan, Peigen Lin, Leah T. McRaven, Loreley S. Lago, Jie Huang, Frank Bahr, Dean A. Stockwell, Katherine A. Hubbard, Thomas J. Farrugia, Kathi A. Lefebvre, Donald M. Anderson
In recent years, blooms of the neurotoxic dinoflagellate Alexandrium catenella have been documented in Pacific Arctic waters, and the paralytic shellfish toxins (PSTs) that this species produces have been detected throughout the food web. These observations have raised significant concerns about the role that harmful algal blooms (HABs) will play in a rapidly changing Arctic. During a research cruise
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Carbon emissions from inland waters may be underestimated: Evidence from European river networks fragmented by drying Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-07-05 Naiara López‐Rojo, Thibault Datry, Francisco J. Peñas, Gabriel Singer, Nicolas Lamouroux, José Barquín, Amaia A. Rodeles, Teresa Silverthorn, Romain Sarremejane, Rubén del Campo, Edurne Estévez, Louise Mimeau, Frédéric Boyer, Annika Künne, Martin Dalvai Ragnoli, Arnaud Foulquier
River networks contribute disproportionately to the global carbon cycle. However, global estimates of carbon emissions from inland waters are based on perennial rivers, even though more than half of the world's river length is prone to drying. We quantified CO2 and CH4 emissions from flowing water and dry riverbeds across six European drying river networks (DRNs, 120 reaches) and three seasons and
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Leaf litter breakdown phenology in headwater stream networks is modulated by groundwater thermal regimes and litter type Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-07-04 Danielle K. Hare, Ashley M. Helton, Carolyn S. Cummins, Phillip M. Bumpers, Nathan J. Tomczyk, Phoenix A. Rogers, Seth J. Wenger, Erin R. Hotchkiss, Amy D. Rosemond, Jonathan P. Benstead
Leaf litter dominates particulate organic carbon inputs to forest streams. Using data‐informed simulations, we explored how litter type (slow‐ vs. fast‐decomposing species), pulsed autumn litter inputs, groundwater‐mediated temperature regimes, and climate warming affect litter breakdown in a 3rd‐order stream network. We found that the time‐dependent interactions of these variables govern network‐scale
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Consistency in marine heatwave experiments for ecological relevance and application: Key problems and solutions Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-07-02 Deevesh A. Hemraj, Bayden D. Russell
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Changes in phytoplankton size–structure alter trophic transfer in a temperate, coastal planktonic food web Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-07-02 Pierre Marrec, Susanne Menden‐Deuer
Microzooplankton grazing is an essential parameter to predict the fate of organic matter production in planktonic food webs. To identify predictors of grazing, we leveraged a 6‐yr time series of coastal plankton growth and grazing rates across contrasting environmental conditions. Phytoplankton size–structure and trophic transfer were seasonally consistent with small phytoplankton cell dominance and
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Knowing your limits: Patterns and drivers of nutrient limitation and nutrient–chlorophyll relationships in US lakes Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-07-01 Ian M. McCullough, Xinyu Sun, Patrick J. Hanly, Patricia A. Soranno
Although understanding nutrient limitation of primary productivity in lakes is among the oldest research priorities in limnology, there have been few broad‐scale studies of the characteristics of phosphorus (P)‐, nitrogen (N)‐, and co‐limited lakes and their environmental context. By analyzing 3342 US lakes with concurrent P, N, and chlorophyll a (Chl a) samples, we showed that US lakes are predominantly
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Grazer‐induced changes on mechanical properties of diatoms frustule: A new proof for a watery arms race Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-07-01 Huo Xu, Fengyuan Chen, Xiaodong Zhang, Zhen Zhang, Ke Pan, Hongbin Liu
We investigated changes in physiology and mechanical properties of diatoms exposed to chemical cues released by copepods Pseudodiaptomus annandalei. Our results showed that the diatoms Phaeodactylum tricornutum, Cylindrotheca closterium, Thalassiosira weissflogii, and Amphora coffeaeformis exhibited elevated growth rates and a substantial 2‐ to 50‐fold increase in biogenic silica (BSi) content increase
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Low‐molecular‐weight reduced sulfur substances: A major component of nonvolatile dissolved organic sulfur in the Pacific Ocean Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-06-28 Pierre Fourrier, Gabriel Dulaquais
The low‐molecular‐weight (LMW) reduced sulfur substances (RSS) composition of dissolved organic matter (DOM) was examined along the GEOTRACES US‐GP15 section in the Pacific Ocean. We demonstrate that LMW RSS constitutes a significant fraction of nonvolatile dissolved organic sulfur (DOS). While thiols such as glutathione were below our detection limit (300 pM), RSS containing two carbon (C) sulfur
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Energy inputs imprint seasonality and fractal structure on river metabolic regimes Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-06-25 Yuseung Shin, James W. Jawitz, Matthew J. Cohen
The temporal structures of gross primary production (GPP) and ecosystem respiration (ER) vary across time scales in response to complex interactions among dynamic drivers (e.g., flow, light, temperature, organic matter supply). To explore emergent patterns of river metabolic variation, we applied frequency‐domain analysis to multiyear records of metabolism across 87 US rivers. We observed a dominant
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pCO2 variation in ice‐covered regions of the Arctic Ocean from the summer 2022 observation Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-06-20 Ahra Mo, Keyhong Park, Tae‐Wook Kim, Doshik Hahm, Jung‐Ok Choi, Sohyeon Geum, Jinyoung Jung, Eun Jin Yang
To enhance our understanding of the carbon cycle in the Arctic Ocean, comprehensive observational data are crucial, including measurements from the underlying ice water. This study proposed a practical method for calibrating pCO2 sensor using measured dissolved inorganic carbon and total alkalinity. Our findings suggested the minimum number of bottle samples needed for calibration to ensure 1% accuracy
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Vegetation promotes flow retardation and retention in deltaic wetlands Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-05-31 Xiaohe Zhang, Cathleen E. Jones, Marc Simard, Paola Passalacqua, Talib Oliver‐Cabrera, Sergio Fagherazzi
We introduce a new approach to observe the impact of vegetation on tidal flow retardation and retention at large spatial scales. Using radar interferometry and in situ water level gauge measurements during low tide, we find that vegetation in deltaic intertidal zones of the Wax Lake Delta, Louisiana, causes significant tidal distortion with both a delay (between 80 and 140 min) and amplitude reduction
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A two‐year physicochemical and acoustic observation reveals spatiotemporal effects of earthquake‐induced shallow‐water hydrothermal venting on the surrounding environments Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-05-30 Ling Chiu, Min‐Chen Wang, Chih‐Lin Wei, Tzu‐Hao Lin, Yung‐Che Tseng
Shallow‐water hydrothermal vents have gained growing attention for their intricate characteristics caused by various epipelagic factors. The shallow‐water hydrothermal system offshore Kueishan Island, Taiwan, situated in an earthquake‐prone area, has prompted our exploration into the relationship between hydrothermal and seismic activities. Our 2‐yr observation uncovered that the hydrothermal venting
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Sedimentary ancient DNA and HBI biomarkers as sea‐ice indicators: A complementary approach in Antarctic fjord environments Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-05-27 Anna J. Pieńkowski, Witold Szczuciński, Agnieszka Breszka, Maciej Chyleński, Anna Juras, Paulina Romel, Piotr Rozwalak, Artur Trzebny, Mirosława Dabert, Simon T. Belt, Robert Jagodziński, Lukas Smik, Wojciech Włodarski
Reliable high‐resolution, pre‐observational‐period sea‐ice datasets are rare but critical for contextualizing recent sea‐ice declines and future scenarios. We combine sedimentary ancient DNA of the sea‐ice dinoflagellate Polarella glacialis (Pgla‐sedaDNA) with selected highly branched isoprenoid (HBI) biomarkers alongside other indicators to reconstruct sub‐decadal sea‐ice changes in a marine archive
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Combined exposure to CO2 and H2S significantly reduces the performance of the Mediterranean seagrass Posidonia oceanica: Evidence from a volcanic vent Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-05-23 Geraldina Signa, Valentina Sciutteri, Agostino Tomasello, Valentina Costa, Silvia Casabianca, Giovanna Cilluffo, Cristina Andolina, Salvatrice Vizzini
Although seagrasses are expected to thrive in future acidified oceans by overcoming low CO2 diffusion into plant tissues, the co‐occurrence of environmental stressors may affect their growth. Volcanic CO2 vents are often associated with toxic gases and metal‐rich fluids representing ideal sites to assess the effects of multiple stressors. We evaluated the response of Posidonia oceanica growing near
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Unveiling differential thermal sensitivities in marine phytoplankton within the China Seas Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-05-23 Changyun Wang, Shujie Cai, Zhuyin Tong, Jixin Chen, Lizhen Lin, Wupeng Xiao, Xin Liu, Bangqin Huang
In this study, we explored the realized thermal sensitivities of various phytoplankton groups in natural seawater, a crucial aspect for understanding the dynamics of marine ecosystems under climate change. Utilizing a decadal pigment dataset (2002–2015) from China Seas and employing generalized additive mixed models coupled with maximum entropy modeling, we discerned thermal sensitivity differentiations
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Stream CO2 emissions are overestimated without consideration of diel water and atmospheric CO2 variability Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-05-17 Theresa Reichenpfader, Katrin Attermeyer
Streams are significant emitters of carbon dioxide (CO2) to the atmosphere that are influenced by diel CO2 dynamics. However, we know little about diel CO2 variability within streams, the diel dynamics of CO2 in the air above streams, and the consequences for emission calculations. We studied five pre‐alpine streams by equipping three sites per stream in close proximity (~ 1 km apart) with automatic
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Global subterranean estuaries modify groundwater nutrient loading to the ocean Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-05-16 Stephanie J. Wilson, Amy Moody, Tristan McKenzie, M. Bayani Cardenas, Elco Luijendijk, Audrey H. Sawyer, Alicia Wilson, Holly A. Michael, Bochao Xu, Karen L. Knee, Hyung‐Mi Cho, Yishai Weinstein, Adina Paytan, Nils Moosdorf, Chen‐Tung Aurthur Chen, Melanie Beck, Cody Lopez, Dorina Murgulet, Guebuem Kim, Mathew A. Charette, Hannelore Waska, J. Severino P. Ibánhez, Gwénaëlle Chaillou, Till Oehler, Shin‐ichi
Terrestrial groundwater travels through subterranean estuaries before reaching the sea. Groundwater‐derived nutrients drive coastal water quality, primary production, and eutrophication. We determined how dissolved inorganic nitrogen (DIN), dissolved inorganic phosphorus (DIP), and dissolved organic nitrogen (DON) are transformed within subterranean estuaries and estimated submarine groundwater discharge
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The elephant in the conference room: reducing the carbon footprint of aquatic science meetings Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-05-11 Marie‐Elodie Perga, Thorsten Dittmar, Damien Bouffard, Emma Kritzberg
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Short wave attenuation by a kelp forest canopy Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-05-10 M. Lindhart, M. A. Daly, H. Walker, I. B. Arzeno‐Soltero, J. Z. Yin, T. W. Bell, S. G. Monismith, G. Pawlak, J. J. Leichter
Giant kelp (Macrocystis pyrifera) forests are common along the California coast. Attached on the rocky bottom at depths of approximately 5–25 m, the kelp, when mature, spans the water column and develops dense, buoyant canopies that interact with waves and currents. We present two novel results based on observations of surface gravity waves in a kelp forest in Point Loma, California. First, we report
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Species richness and intraspecific variation interactively shape marine diatom community functioning Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-05-08 Patrick K. Thomas, Marrit Jacob, Esteban Acevedo‐Trejos, Helmut Hillebrand, Maren Striebel
Biodiversity generally increases productivity in ecosystems; however, this is mediated by the specific functional traits that come with biodiversity loss or gain and how these traits interact with environmental conditions. Most biodiversity studies evaluate the effects of species richness alone, despite our increasing understanding that intraspecific diversity can have equally strong impacts. Here
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Qualitative and quantitative changes in phenology of chlorophyll a concentrations during the transition from eutrophy to oligotrophy Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-05-03 Dietmar Straile, Karl‐Otto Rothhaupt
The PEG (Plankton Ecology Group) model predicts differences in phenology between eutrophic and oligotrophic lakes regarding the occurrence, timing and magnitude of annual chlorophyll maxima and minima. While these predictions have been tested between lakes, hardly any tests exist using long‐term data. We test these predictions using chlorophyll time‐series (1980–2019) from Lake Constance in which trophic
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Assessing N2 fixation flux and its controlling factors in the (sub)tropical western North Pacific through high‐resolution observations Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-05-03 Xinran Yu, Zuozhu Wen, Ruotong Jiang, Jin‐Yu Terence Yang, Zhimian Cao, Haizheng Hong, Yuntao Zhou, Dalin Shi
The (sub)tropical western North Pacific is potentially an area of intense nitrogen (N2) fixation in the global ocean, despite limited understanding of the flux and controlling factors. We conducted high‐resolution observations from 2016 to 2021 in this region and used machine learning algorithms to simulate N2 fixation flux. Models estimated an N2 fixation flux from 5.72 to 6.45 Tg N yr−1, with strong
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Key bacterial groups maintain stream multifunctionality in response to episodic drying Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-04-30 Giulia Gionchetta, Rebeca Arias‐Real, Pilar Hurtado, Helmut Bürgmann, Cayetano Gutiérrez‐Cánovas
Microbial biodiversity is fundamental to maintain ecosystem functioning in seasonally variable ecosystems. However, it remains unclear how alterations in water availability caused by episodic drying compromise the ability of stream microbes to maintain multiple functions simultaneously (e.g., primary production and carbon cycling). Using data from 32 streams, we investigated how the phenology of annual
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Bivalve tissues as a recorder of multidecadal global anthropogenic and climate‐mediated change in coastal areas Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-04-26 Camilla Liénart, Alan Fournioux, Andrius Garbaras, Arnaud Lheureux, Hugues Blanchet, Nicolas Briant, Stanislas F. Dubois, Aline Gangnery, Anne Grouhel Pellouin, Pauline Le Monier, Xavier De Montaudouin, Nicolas Savoye
Recent rapid changes in climate and environmental conditions have significantly impacted coastal ecosystem functioning. However, the complex interplay between global and local effects makes it challenging to pinpoint the primary drivers. In a multi‐ecosystem study, we analyzed pluri‐decadal trends of bivalve‐δ13C as recorder of global environmental changes. These trends were correlated with large‐scale
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Whales and cephalopods in a deep‐sea arms race Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-04-24 Henk‐Jan Hoving, Fleur Visser
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Deep‐learning‐powered data analysis in plankton ecology Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-04-18 Harshith Bachimanchi, Matthew I. M. Pinder, Chloé Robert, Pierre De Wit, Jonathan Havenhand, Alexandra Kinnby, Daniel Midtvedt, Erik Selander, Giovanni Volpe
The implementation of deep learning algorithms has brought new perspectives to plankton ecology. Emerging as an alternative approach to established methods, deep learning offers objective schemes to investigate plankton organisms in diverse environments. We provide an overview of deep‐learning‐based methods including detection and classification of phytoplankton and zooplankton images, foraging and
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Recent warming of the Kuroshio Current has promoted offshore sediment transport in the Yellow Sea Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-04-18 Yong Shi, Xiaomei Xu, Tao Liu, Guang Yang, Shengjing Liu, Jixuan Lyu, Shuo Zhang, Hui Sheng, Jianhua Gao
As cross‐shelf gradients of most properties are typically much steeper than those in the alongshore direction, transport across isobaths tends to be inhibited, particularly at oceanic fronts where cross‐shelf gradients are markedly pronounced. Consequently, variations in cross‐shelf gradients may exert a significant influence on offshore transport; however, this influence is not yet well understood
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Weakening Indian Ocean carbon uptake in 2015: The role of amplified basin‐wide warming and reduced Indonesian throughflow Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-04-17 Enhui Liao, Wenfang Lu, Liang Xue, Yan Du
In 2015, the Indian Ocean exhibits an exceptionally weakened CO2 uptake, highlighting strong interannual variability of ocean carbon sink. By utilizing multiple ocean CO2 partial pressure (pCO2) data and a state‐of‐the‐art ocean biogeochemical model, we show that the 2015 ocean CO2 anomaly is characterized by a basin‐wide amplification of ocean pCO2, differing from ocean pCO2 responses to other Indian
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Projecting expected growth period of bivalves in a coastal temperate sea Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-04-17 Petra Zemunik Selak, Cléa Denamiel, Melita Peharda, Bernd R. Schöne, Julien Thébault, Hana Uvanović, Krešimir Markulin, Ivica Vilibić
The impact of climate warming on coastal benthic fauna is already observed, but forecasting their long‐term fate remains challenging. This study uses δ18Oshell data of specimens of five bivalve species collected at six locations and results from kilometer‐scale atmosphere–ocean climate model for the time intervals of 1987–2017 and 2070–2100, to estimate changes in bivalve growth phenology. All species
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Polyphosphate phosphorus in the Great Lakes Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-04-16 Xingyu Yang, Rixuan Gao, Audrey Huff, Sergei Katsev, Ted Ozersky, Jiying Li
Polyphosphate (polyP) is important to phytoplankton ecology, but a unified view of its variability and roles in ecosystem‐scale phosphorus (P) cycling is lacking. We study polyP in the world's largest freshwater ecosystem, the Laurentian Great Lakes, covering pelagic to nearshore areas across a wide nutrient gradient. We show that polyP (average 10.99 ± 3.90 nmol L−1) constitutes 3.8–30.2% (average
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The aquaculture industry as a global network of perturbation experiments Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-04-16 Jemma M. Fadum, Ed K. Hall, Elena Litchman, Emily J. Zakem
Scientific Significance Statement Aquaculture is a global industry that enriches the surrounding aquatic environment in nutrients, namely carbon, nitrogen, and phosphorus. Because these inputs are spatially and temporally defined, cage culture farms act as perturbation experiments for understanding the ecological impacts of nutrient enrichment on aquatic ecosystems. Individual farms form an existing
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Concentration and compositional controls on degradation of permafrost‐derived dissolved organic matter on the Qinghai–Tibetan Plateau Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-04-10 Yinghui Wang, Yasong Wang, Lulu Han, Amy M. McKenna, Anne M. Kellerman, Robert G. M. Spencer, Yuanhe Yang, Yunping Xu
Understanding the fate of permafrost‐derived dissolved organic matter (DOM) is critical for unraveling its role in carbon cycling. However, it remains unclear whether the high lability of permafrost‐derived DOM can be attributed to intrinsic chemical properties or elevated carbon concentrations. We investigated the dynamics of permafrost DOM from the Qinghai–Tibetan Plateau using both biodegradation
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Widespread warming of Earth's estuaries Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-04-05 Punwath Prum, Lora Harris, John Gardner
Water temperature responses to climate change may vary across Earth's estuaries. To understand how climate change influences estuarine surface water temperature, we need global, long‐term records of estuarine temperature. Here, we generated surface water temperature data over 1060 estuaries globally using Landsat 5, 7, and 8 from 1985 to 2022 and compared water warming rates with local air temperature
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Plankton blooms over the annual cycle shape trophic interactions under climate change Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-04-03 Kinlan M. G. Jan, Baptiste Serandour, Jakob Walve, Monika Winder
Understanding species phenology and temporal co‐occurrence across trophic levels is essential to assess anthropogenic impacts on ecological interactions. We analyzed 15 yr of monitoring data to identify trends and drivers of timing and magnitude of bloom‐forming phytoplankton and diverse zooplankton taxa in the central Baltic Sea. We show that the timings of phytoplankton blooms advance, whereas crustacean
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Earlier ice melt increases hypolimnetic oxygen despite regional warming in small Arctic lakes Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-04-02 Václava Hazuková, Benjamin T. Burpee, Robert M. Northington, N. John Anderson, Jasmine E. Saros
Although trends toward earlier ice‐out have been documented globally, the links between ice‐out timing and lake thermal and biogeochemical structure vary spatially. In high‐latitude lakes where ice‐out occurs close to peak intensity of solar radiation, these links remain unclear. Using a long‐term dataset from 13 lakes in West Greenland, we investigated how changing ice‐out and weather conditions affect
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Measurements of the inherent optical properties of aqueous suspensions of microplastics Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-03-25 Daniel Koestner, Robert Foster, Ahmed El‐Habashi, Shea Cheatham
Libraries of inherent optical properties (IOPs) of microplastics are sparse, yet they are essential for the development of optical techniques to detect and quantify microplastics in the ocean. In this study, we describe our results and technique for the measurement of the IOPs of microplastic suspensions generated from commonly utilized plastics. The measurements included angle‐resolved polarized light
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Plant‐sediment interactions decouple inorganic from organic carbon stock development in salt marsh soils Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-03-09 Dirk Granse, Antonia Wanner, Martin Stock, Kai Jensen, Peter Mueller
The storage of organic carbon in the soils of salt marshes and other coastal blue carbon ecosystems has gained considerable attention by the scientific community for more than a decade now, while the relevance and mechanisms of soil inorganic carbon accumulation remain poorly understood. Using long‐term annual accretion monitoring over 17 years in N = 50 permanent plots distributed across a 1050‐ha
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Particulate organic carbon sedimentation triggers lagged methane emissions in a eutrophic reservoir Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-03-09 Andrés Martínez‐García, Ignacio Peralta‐Maraver, Eva Rodríguez‐Velasco, Gema L. Batanero, Miriam García‐Alguacil, Félix Picazo, Juan Calvo, Rafael Morales‐Baquero, Francisco J. Rueda, Isabel Reche
Reservoirs act as carbon sinks when sedimentation of particulate organic carbon (POC) exceeds CO2 and CH4 emissions. Here, we study the poorly explored process where phytoplankton‐derived acidic polysaccharides (APs) aggregate into particulate organic matter, promoting carbon export to sediments. This source of POC in sediments can mineralize to CO2 and CH4 over various timescales. Our research, centered
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Dissolved organic matter offsets the detrimental effects of climate change in the nitrogen‐fixing cyanobacterium Crocosphaera Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-03-05 Alba Filella, Jacqueline Umbricht, Angelina Klett, Angela Vogts, Thomas Vannier, Olivier Grosso, Maren Voss, Lasse Riemann, Mar Benavides
Diazotrophs provide a significant reactive nitrogen source in the ocean. Increased warming and stratification may decrease nutrient availability in the future, forcing microbial communities toward using dissolved organic matter (DOM). Not depending on reactive nitrogen availability, diazotrophs may be “winners” in a nutrient‐depleted ocean. However, their ability to exploit DOM may influence this success
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Lagging spawning and increasing phenological extremes jeopardize walleye (Sander vitreus) in north‐temperate lakes Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-02-26 Martha E. Barta, Greg G. Sass, Jeffrey R. Reed, Thomas A. Cichosz, Aaron D. Shultz, Mark Luehring, Zachary S. Feiner
The phenology of critical biological events in aquatic ecosystems is rapidly shifting due to climate change. Growing variability in phenological cues can increase the likelihood of trophic mismatches (i.e., mismatches in the timing of peak prey and predator abundances), causing recruitment failures in important fisheries. We assessed changes in the spawning phenology of walleye (Sander vitreus) in
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Sea-ice loss accelerates carbon cycling and enhances seasonal extremes of acidification in the Arctic Chukchi Sea Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-02-05 Yixing Zhang, Yingxu Wu, Wei-Jun Cai, Xiangqi Yi, Xiang Gao, Haibo Bi, Yanpei Zhuang, Liqi Chen, Di Qi
The Chukchi Sea shelf (CSS) is a highly productive region in the Arctic Ocean and it is highly efficient for absorbing atmospheric carbon dioxide and exporting and retaining carbon in the deep sea. However, with global warming, the carbon retention time in CSS may decrease, leading to less efficient carbon export. Here, we investigate the seasonal variability of carbonate chemistry in CSS using three
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Biotic and thermal drivers alter zooplankton phenology in western Lake Erie Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-02-02 Jenna Bailey, James M. Hood
Environmental change, particularly warming and eutrophication, can alter phenology in aquatic systems. Understanding controls on zooplankton phenology is important due to their central role in food webs. While patterns in zooplankton phenology have been well documented, we lack an understanding of how abiotic and biotic drivers influence lake zooplankton phenology during the summer. We examined the
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Enhanced stream greenhouse gas emissions at night and during flood events Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-01-28 Rebecca L. Woodrow, Shane A. White, Stephen R. Conrad, Praktan D. Wadnerkar, Gerard Rocher-Ros, Christian J. Sanders, Ceylena J. Holloway, Isaac R. Santos
Headwater streams play a large role in aquatic greenhouse gas emissions. Carbon dioxide (CO2) and dissolved oxygen in streams often undergo changes through diel cycles. However, methane (CH4) and nitrous oxide (N2O) have unknown diel dynamics. Here, we reveal consistent patterns in CO2, CH4, and N2O over diel cycles and during flood events using high-frequency continuous observations in a subtropical
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Mesocosm experiments validate induction of Daphnia vertical migration by the fish-derived kairomone 5α-cyprinol sulfate Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-01-26 Johanna Ahlers, Meike Hahn, Maria Stockenreiter, Herwig Stibor, Eric von Elert
The fish-derived bile salt 5α-cyprinol sulfate (CPS) has been identified as a kairomone inducing the predator avoidance behavior “diel vertical migration” (DVM) in Daphnia magna in response to fish. However, conclusions about the ecological significance of CPS have been derived from laboratory experiments only. Using a mesocosm approach, we investigate whether the role of CPS as a kairomone can be
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How to write lay summaries of research articles for wider accessibility Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-01-16 Laura J. Falkenberg, Patrick W. S. Joyce, Patricia A. Soranno
Scientific Significance Statement Scientific writing can be hard for nonspecialists to understand. Journals are trying to make findings more accessible by asking authors to write “lay summaries.” These texts are intended to be more widely understood than abstracts. We show, however, that they are not more accessible due to high jargon and low readability scores of the writing. We offer tips to authors
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Establishing fluvial silicon regimes and their stability across the Northern Hemisphere Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2024-01-13 Keira Johnson, Kathi Jo Jankowski, Joanna Carey, Nicholas J. Lyon, William H. McDowell, Arial Shogren, Adam Wymore, Lienne Sethna, Wilfred M. Wollheim, Amanda E. Poste, Pirkko Kortelainen, Ruth Heindel, Hjalmar Laudon, Antti Räike, Jeremy B. Jones, Diane McKnight, Paul Julian, Sidney Bush, Pamela L. Sullivan
Fluvial silicon (Si) plays a critical role in controlling primary production, water quality, and carbon sequestration through supporting freshwater and marine diatom communities. Geological, biogeochemical, and hydrological processes, as well as climate and land use, dictate the amount of Si exported by streams. Understanding Si regimes—the seasonal patterns of Si concentrations—can help identify processes
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Characterization of a Southern Ocean deep chlorophyll maximum: Response of phytoplankton to light, iron, and manganese enrichment Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2023-12-27 Pauline Latour, Sam Eggins, Pier van der Merwe, Lennart T. Bach, Philip W. Boyd, Michael J. Ellwood, Andrew R. Bowie, Kathrin Wuttig, Robert F. Strzepek
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Ice-melt period dominates annual carbon dioxide evasion from clear-water Arctic lakes Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2023-12-18 J. Karlsson, H. A. Verheijen, D. A. Seekell, D. Vachon, M. Klaus
Current estimates of carbon dioxide (CO2) evasion from Arctic lakes are highly uncertain because few studies integrate seasonal variability, specifically evasion during spring ice-melt. We quantified annual CO2 evasion for 14 clear-water Arctic lakes in Northern Sweden through mass balance (ice-melt period) and high-frequency loggers (open-water period). On average, 80% (SD: ± 18) of annual CO2 evasion
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Shedding light on cobalamin photodegradation in the ocean Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2023-12-14 Catherine C. Bannon, Elizabeth M. Mudge, Erin M. Bertrand
Cobalamin, vitamin B12, is an important micronutrient that has been investigated for decades in the marine context because it is required for phytoplankton growth. The biologically active forms (Me-B12, Ado-B12) and the synthetic form (CN-B12) quickly convert to OH-B12 after light exposure in various aqueous solutions, but puzzlingly have been frequently reported to dominate dissolved cobalamin pools
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Persistent hot spots of CO2 and CH4 in coastal nearshore environments Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2023-12-13 Eero Asmala, Matias Scheinin
Nearshore environments are typically supersaturated with the potent greenhouse gases methane and carbon dioxide, due to intense remineralization of the elevated supply of organic carbon in these systems. These environments are characterized by overlapping biogeochemical gradients and heterogeneous morphology, and the overall spatial variability in nearshore greenhouse gas concentrations remains unclear
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A new metric for sunlight exposure in rivers, lakes, and oceans Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2023-11-22 John R. Gardner, Martin W. Doyle, Scott H. Ensign, David M. Kahler
Vertical motion is an important driver of sunlight exposure in aquatic environments, shaping the growth and fate of materials and organisms. We derive a simple model accounting for turbulent depth fluctuations of particles to predict the depth that contributes the most sunlight exposure (effective depth) as well as the single depth that, if measured at one place over time, produces the same total sunlight
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Salinization, warming, and loss of water clarity inhibit vertical mixing of small urban ponds Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2023-11-16 Charlie J.G. Loewen, Donald A. Jackson
Urbanization drives multiple environmental changes that influence critical ecosystem processes. Factors such as salinization by deicing road salts, reduced water clarity (and greater light attenuation) from eutrophication and sediment loading, and warming constrain not only the biodiversity of ponds, but also their physical mixing (with consequences for oxygen availability and the provision of ecosystem
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Increased anoxia following species invasion of a eutrophic lake Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2023-11-14 Robin R. Rohwer, Robert Ladwig, Paul C. Hanson, Jake R. Walsh, M. Jake Vander Zanden, Hilary A. Dugan
Species invasions can disrupt aquatic ecosystems by re-wiring food webs. A trophic cascade triggered by the invasion of the predatory zooplankter spiny water flea (Bythotrephes cederströmii) resulted in increased phytoplankton due to decreased zooplankton grazing. Here, we show that increased phytoplankton biomass led to an increase in lake anoxia. The temporal and spatial extent of anoxia experienced
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Warming-induced changes in benthic redox as a potential driver of increasing benthic algal blooms in high-elevation lakes Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2023-10-31 Stephanie E. Hampton, Jill S. Baron, Robert Ladwig, Ryan P. McClure, Michael F. Meyer, Isabella A. Oleksy, Anna Shampain
Scientific Significance Statement Algal blooms appear to be increasing on benthic substrates of naturally nutrient-poor lakes worldwide, yet common drivers across these systems remain elusive. The phenomenon has been notable in high-elevation mountain lakes, which is enigmatic given their relative remoteness from human disturbance. We suggest that warming-induced changes in redox conditions that promote
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Significant benthic fluxes of bioavailable dissolved amino acids to the ocean: Results from the East/Japan Sea Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2023-10-26 Hyekyung Park, Guebuem Kim, Sung-Han Kim, Jae Seong Lee
We measured dissolved organic carbon (DOC) and total dissolved amino acid (TDAA) in seawater and sediment porewater of the Ulleung Basin in the East/Japan Sea. The DOC and TDAA concentrations were 1.1- and 1.4-fold higher in the euphotic zone, and 11- and 43-fold higher in sediment porewater, respectively, than those in the deep ocean. Consequently, in the deep ocean, TDAA and DOC input fluxes from
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Hydrology, rather than wildfire burn extent, determines post-fire organic and black carbon export from mountain rivers in central coastal California Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2023-10-18 Riley Barton, Christina M. Richardson, Evelyn Pae, Maya S. Montalvo, Michael Redmond, Margaret A. Zimmer, Sasha Wagner
Coastal mountain rivers export disproportionately high quantities of terrestrial organic carbon (OC) directly to the ocean, feeding microbial communities and altering coastal ecology. To better predict and mitigate the effects of wildfires on aquatic ecosystems and resources, we must evaluate the relationships between fire, hydrology, and carbon export, particularly in the fire-prone western United
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Acoustic twilight: A year-long seafloor monitoring unveils phenological patterns in the abyssal soundscape Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2023-10-17 Tzu-Hao Lin, Shinsuke Kawagucci
Despite the perpetual darkness of the deep sea, contrasting the sunlit epipelagic waters, many deep-sea organisms exhibit rhythmic activities. To discern environmental cues that may serve as entrainment signals for deep-sea organisms, this study investigated the soundscape of the abyssal plain south of Minamitorishima Island. Our analysis revealed clear diel and seasonal patterns, primarily driven
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Relative importance of bacterivorous mixotrophs in an estuary-coast environment Limnol. Oceanogr. Lett. (IF 5.1) Pub Date : 2023-10-14 Qian Li, Kaiyi Dong, Ying Wang, Kyle F. Edwards
Mixotrophic eukaryotes are important bacterivores in oligotrophic open oceans, but their significance as grazers in more nutrient-rich waters is less clear. Here, we investigated the bacterivory partition between mixotrophs and heterotrophs in a productive, estuary-influenced coastal region in the East China Sea. We found ubiquitous, actively feeding phytoplankton populations and taxa with mixotrophic