Articles | Volume 16, issue 22
https://doi.org/10.5194/bg-16-4411-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-16-4411-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
20 Nov 2019
Research article |
| 20 Nov 2019
| 20 Nov 2019
Net heterotrophy and carbonate dissolution in two subtropical seagrass meadows
Bryce R. Van Dam
CORRESPONDING AUTHOR
Center for Coastal Oceans Research, Department of Biological Sciences,
Florida International University, 11200 SW 8th St, Miami, FL 33199, USA
Institute of Coastal Research, Helmholtz-Zentrum Geesthacht (HZG),
Geesthacht, 21502, Germany
Christian Lopes
Institute of Coastal Research, Helmholtz-Zentrum Geesthacht (HZG),
Geesthacht, 21502, Germany
Christopher L. Osburn
Department of Marine, Earth, and Atmospheric Sciences, North Carolina State
University, 2800 Faucette Drive, Raleigh, NC 27695, USA
James W. Fourqurean
Institute of Coastal Research, Helmholtz-Zentrum Geesthacht (HZG),
Geesthacht, 21502, Germany
Related authors
Julia Meyer, Yoana G. Voynova, Bryce Van Dam, Lara Luitjens, Dagmar Daehne, and Helmuth Thomas
EGUsphere, https://doi.org/10.5194/egusphere-2024-3048, https://doi.org/10.5194/egusphere-2024-3048, 2024
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The study highlights the inter-seasonal variability of the carbonate dynamics of the East Frisian Wadden Sea, the world's largest intertidal area. During spring, increased biological activity leads to lower CO2 and nitrate levels, while total alkalinity (TA) rises slightly. In summer, TA increases, enhancing the ocean's ability to absorb CO2. Our research emphasizes the vital role of these intertidal regions in regulating carbon, contributing to a better understanding of carbon storage.
Bryce Van Dam, Nele Lehmann, Mary A. Zeller, Andreas Neumann, Daniel Pröfrock, Marko Lipka, Helmuth Thomas, and Michael Ernst Böttcher
Biogeosciences, 19, 3775–3789, https://doi.org/10.5194/bg-19-3775-2022, https://doi.org/10.5194/bg-19-3775-2022, 2022
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We quantified sediment–water exchange at shallow sites in the North and Baltic seas. We found that porewater irrigation rates in the former were approximately twice as high as previously estimated, likely driven by relatively high bioirrigative activity. In contrast, we found small net fluxes of alkalinity, ranging from −35 µmol m−2 h−1 (uptake) to 53 µmol m−2 h−1 (release). We attribute this to low net denitrification, carbonate mineral (re-)precipitation, and sulfide (re-)oxidation.
Julia Meyer, Yoana G. Voynova, Bryce Van Dam, Lara Luitjens, Dagmar Daehne, and Helmuth Thomas
EGUsphere, https://doi.org/10.5194/egusphere-2024-3048, https://doi.org/10.5194/egusphere-2024-3048, 2024
Short summary
Short summary
The study highlights the inter-seasonal variability of the carbonate dynamics of the East Frisian Wadden Sea, the world's largest intertidal area. During spring, increased biological activity leads to lower CO2 and nitrate levels, while total alkalinity (TA) rises slightly. In summer, TA increases, enhancing the ocean's ability to absorb CO2. Our research emphasizes the vital role of these intertidal regions in regulating carbon, contributing to a better understanding of carbon storage.
Bryce Van Dam, Nele Lehmann, Mary A. Zeller, Andreas Neumann, Daniel Pröfrock, Marko Lipka, Helmuth Thomas, and Michael Ernst Böttcher
Biogeosciences, 19, 3775–3789, https://doi.org/10.5194/bg-19-3775-2022, https://doi.org/10.5194/bg-19-3775-2022, 2022
Short summary
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We quantified sediment–water exchange at shallow sites in the North and Baltic seas. We found that porewater irrigation rates in the former were approximately twice as high as previously estimated, likely driven by relatively high bioirrigative activity. In contrast, we found small net fluxes of alkalinity, ranging from −35 µmol m−2 h−1 (uptake) to 53 µmol m−2 h−1 (release). We attribute this to low net denitrification, carbonate mineral (re-)precipitation, and sulfide (re-)oxidation.
A. R. Armitage and J. W. Fourqurean
Biogeosciences, 13, 313–321, https://doi.org/10.5194/bg-13-313-2016, https://doi.org/10.5194/bg-13-313-2016, 2016
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The emerging field of blue carbon research seeks to quantify the carbon sequestration in coastal habitats. Seagrasses are highly productive, and have a particularly large carbon storage capacity, relative to area. This study evaluated the influence of nutrient input on seagrass carbon stocks in Florida Bay (USA). There was high carbon content in the soils, indicating that seagrass beds have extremely high carbon storage potential, even in nutrient-limited areas with low biomass or productivity.
I. Mazarrasa, N. Marbà, C. E. Lovelock, O. Serrano, P. S. Lavery, J. W. Fourqurean, H. Kennedy, M. A. Mateo, D. Krause-Jensen, A. D. L. Steven, and C. M. Duarte
Biogeosciences, 12, 4993–5003, https://doi.org/10.5194/bg-12-4993-2015, https://doi.org/10.5194/bg-12-4993-2015, 2015
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There has been growing interest in quantifying the capacity of seagrass ecosystems to act as carbon sinks as a natural way of offsetting anthropogenic carbon emissions to the atmosphere. However, most of the efforts have focused on the organic fraction and ignored the inorganic carbon pool. This study offers the first global assessment of PIC stocks and accumulation rates in seagrass sediments, identifying these ecosystems as important contributors to carbonate dynamics in coastal areas.
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Riverine nutrient impact on global ocean nitrogen cycle feedbacks and marine primary production in an Earth system model
The Northeast Greenland Shelf as a potential late-summer CO2 source to the atmosphere
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Estimates of carbon sequestration potential in an expanding Arctic fjord (Hornsund, Svalbard) affected by dark plumes of glacial meltwater
An assessment of ocean alkalinity enhancement using aqueous hydroxides: kinetics, efficiency, and precipitation thresholds
Dissolved nitric oxide in the lower Elbe Estuary and the Port of Hamburg area
Variable contribution of wastewater treatment plant effluents to downstream nitrous oxide concentrations and emissions
Distribution of nutrients and dissolved organic matter in a eutrophic equatorial estuary: the Johor River and the East Johor Strait
Investigating the effect of silicate- and calcium-based ocean alkalinity enhancement on diatom silicification
Ocean alkalinity enhancement using sodium carbonate salts does not lead to measurable changes in Fe dynamics in a mesocosm experiment
Quantification and mitigation of bottom-trawling impacts on sedimentary organic carbon stocks in the North Sea
Temperature-enhanced effects of iron on Southern Ocean phytoplankton
Influence of ocean alkalinity enhancement with olivine or steel slag on a coastal plankton community in Tasmania
Multi-model comparison of trends and controls of near-bed oxygen concentration on the northwest European continental shelf under climate change
Picoplanktonic methane production in eutrophic surface waters
Vertical mixing alleviates autumnal oxygen deficiency in the central North Sea
Hypoxia also occurs in small highly turbid estuaries: the example of the Charente (Bay of Biscay)
Seasonality and response of ocean acidification and hypoxia to major environmental anomalies in the southern Salish Sea, North America (2014–2018)
The influence of zooplankton and oxygen on the particulate organic carbon flux in the Benguela Upwelling System
Oceanographic processes driving low-oxygen conditions inside Patagonian fjords
Above- and belowground plant mercury dynamics in a salt marsh estuary in Massachusetts, USA
Reviews and syntheses: Biological Indicators of Oxygen Stress in Water Breathing Animals
Variability and drivers of carbonate chemistry at shellfish aquaculture sites in the Salish Sea, British Columbia
Unusual Hemiaulus bloom influences ocean productivity in Northeastern US Shelf waters
Insights into carbonate environmental conditions in the Chukchi Sea
UAV approaches for improved mapping of vegetation cover and estimation of carbon storage of small saltmarshes: examples from Loch Fleet, northeast Scotland
Iron “ore” nothing: benthic iron fluxes from the oxygen-deficient Santa Barbara Basin enhance phytoplankton productivity in surface waters
Marine anoxia initiates giant sulfur-oxidizing bacterial mat proliferation and associated changes in benthic nitrogen, sulfur, and iron cycling in the Santa Barbara Basin, California Borderland
Uncertainty in the evolution of northwestern North Atlantic circulation leads to diverging biogeochemical projections
The additionality problem of ocean alkalinity enhancement
Short-term variation in pH in seawaters around coastal areas of Japan: characteristics and forcings
Revisiting the applicability and constraints of molybdenum- and uranium-based paleo redox proxies: comparing two contrasting sill fjords
Influence of a small submarine canyon on biogenic matter export flux in the lower St. Lawrence Estuary, eastern Canada
Single-celled bioturbators: benthic foraminifera mediate oxygen penetration and prokaryotic diversity in intertidal sediment
Assessing impacts of coastal warming, acidification, and deoxygenation on Pacific oyster (Crassostrea gigas) farming: a case study in the Hinase area, Okayama Prefecture, and Shizugawa Bay, Miyagi Prefecture, Japan
Multiple nitrogen sources for primary production inferred from δ13C and δ15N in the southern Sea of Japan
Influence of manganese cycling on alkalinity in the redox stratified water column of Chesapeake Bay
Estuarine flocculation dynamics of organic carbon and metals from boreal acid sulfate soils
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Temporal and spatial evolution of bottom-water hypoxia in the St Lawrence estuarine system
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Miriam Tivig, David P. Keller, and Andreas Oschlies
Biogeosciences, 21, 4469–4493, https://doi.org/10.5194/bg-21-4469-2024, https://doi.org/10.5194/bg-21-4469-2024, 2024
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Marine biological production is highly dependent on the availability of nitrogen and phosphorus. Rivers are the main source of phosphorus to the oceans but poorly represented in global model oceans. We include dissolved nitrogen and phosphorus from river export in a global model ocean and find that the addition of riverine phosphorus affects marine biology on millennial timescales more than riverine nitrogen alone. Globally, riverine phosphorus input increases primary production rates.
Esdoorn Willcox, Marcos Lemes, Thomas Juul-Pedersen, Mikael Kristian Sejr, Johnna Marchiano Holding, and Søren Rysgaard
Biogeosciences, 21, 4037–4050, https://doi.org/10.5194/bg-21-4037-2024, https://doi.org/10.5194/bg-21-4037-2024, 2024
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In this work, we measured the chemistry of seawater from samples obtained from different depths and locations off the east coast of the Northeast Greenland National Park to determine what is influencing concentrations of dissolved CO2. Historically, the region has always been thought to take up CO2 from the atmosphere, but we show that it is possible for the region to become a source in late summer. We discuss the variables that may be related to such changes.
Lennart Thomas Bach, Aaron James Ferderer, Julie LaRoche, and Kai Georg Schulz
Biogeosciences, 21, 3665–3676, https://doi.org/10.5194/bg-21-3665-2024, https://doi.org/10.5194/bg-21-3665-2024, 2024
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Ocean alkalinity enhancement (OAE) is an emerging marine CO2 removal method, but its environmental effects are insufficiently understood. The OAE Pelagic Impact Intercomparison Project (OAEPIIP) provides funding for a standardized and globally replicated microcosm experiment to study the effects of OAE on plankton communities. Here, we provide a detailed manual for the OAEPIIP experiment. We expect OAEPIIP to help build scientific consensus on the effects of OAE on plankton.
Marlena Szeligowska, Déborah Benkort, Anna Przyborska, Mateusz Moskalik, Bernabé Moreno, Emilia Trudnowska, and Katarzyna Błachowiak-Samołyk
Biogeosciences, 21, 3617–3639, https://doi.org/10.5194/bg-21-3617-2024, https://doi.org/10.5194/bg-21-3617-2024, 2024
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The European Arctic is experiencing rapid regional warming, causing glaciers that terminate in the sea to retreat onto land. Due to this process, the area of a well-studied fjord, Hornsund, has increased by around 100 km2 (40%) since 1976. Combining satellite and in situ data with a mathematical model, we estimated that, despite some negative consequences of glacial meltwater release, such emerging coastal waters could mitigate climate change by increasing carbon uptake and storage by sediments.
Mallory C. Ringham, Nathan Hirtle, Cody Shaw, Xi Lu, Julian Herndon, Brendan R. Carter, and Matthew D. Eisaman
Biogeosciences, 21, 3551–3570, https://doi.org/10.5194/bg-21-3551-2024, https://doi.org/10.5194/bg-21-3551-2024, 2024
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Ocean alkalinity enhancement leverages the large surface area and carbon storage capacity of the oceans to store atmospheric CO2 as dissolved bicarbonate. We monitored CO2 uptake in seawater treated with NaOH to establish operational boundaries for carbon removal experiments. Results show that CO2 equilibration occurred on the order of weeks to months, was consistent with values expected from equilibration calculations, and was limited by mineral precipitation at high pH and CaCO3 saturation.
Riel Carlo O. Ingeniero, Gesa Schulz, and Hermann W. Bange
Biogeosciences, 21, 3425–3440, https://doi.org/10.5194/bg-21-3425-2024, https://doi.org/10.5194/bg-21-3425-2024, 2024
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Our research is the first to measure dissolved NO concentrations in temperate estuarine waters, providing insights into its distribution under varying conditions and enhancing our understanding of its production processes. Dissolved NO was supersaturated in the Elbe Estuary, indicating that it is a source of atmospheric NO. The observed distribution of dissolved NO most likely resulted from nitrification.
Weiyi Tang, Jeff Talbott, Timothy Jones, and Bess B. Ward
Biogeosciences, 21, 3239–3250, https://doi.org/10.5194/bg-21-3239-2024, https://doi.org/10.5194/bg-21-3239-2024, 2024
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Wastewater treatment plants (WWTPs) are known to be hotspots of greenhouse gas emissions. However, the impact of WWTPs on the emission of the greenhouse gas N2O in downstream aquatic environments is less constrained. We found spatially and temporally variable but overall higher N2O concentrations and fluxes in waters downstream of WWTPs, pointing to the need for efficient N2O removal in addition to the treatment of nitrogen in WWTPs.
Amanda Y. L. Cheong, Kogila Vani Annammala, Ee Ling Yong, Yongli Zhou, Robert S. Nichols, and Patrick Martin
Biogeosciences, 21, 2955–2971, https://doi.org/10.5194/bg-21-2955-2024, https://doi.org/10.5194/bg-21-2955-2024, 2024
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We measured nutrients and dissolved organic matter for 1 year in a eutrophic tropical estuary to understand their sources and cycling. Our data show that the dissolved organic matter originates partly from land and partly from microbial processes in the water. Internal recycling is likely important for maintaining high nutrient concentrations, and we found that there is often excess nitrogen compared to silicon and phosphorus. Our data help to explain how eutrophication persists in this system.
Aaron Ferderer, Kai G. Schulz, Ulf Riebesell, Kirralee G. Baker, Zanna Chase, and Lennart T. Bach
Biogeosciences, 21, 2777–2794, https://doi.org/10.5194/bg-21-2777-2024, https://doi.org/10.5194/bg-21-2777-2024, 2024
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Ocean alkalinity enhancement (OAE) is a promising method of atmospheric carbon removal; however, its ecological impacts remain largely unknown. We assessed the effects of simulated silicate- and calcium-based mineral OAE on diatom silicification. We found that increased silicate concentrations from silicate-based OAE increased diatom silicification. In contrast, the enhancement of alkalinity had no effect on community silicification and minimal effects on the silicification of different genera.
David González-Santana, María Segovia, Melchor González-Dávila, Librada Ramírez, Aridane G. González, Leonardo J. Pozzo-Pirotta, Veronica Arnone, Victor Vázquez, Ulf Riebesell, and J. Magdalena Santana-Casiano
Biogeosciences, 21, 2705–2715, https://doi.org/10.5194/bg-21-2705-2024, https://doi.org/10.5194/bg-21-2705-2024, 2024
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In a recent experiment off the coast of Gran Canaria (Spain), scientists explored a method called ocean alkalinization enhancement (OAE), where carbonate minerals were added to seawater. This process changed the levels of certain ions in the water, affecting its pH and buffering capacity. The researchers were particularly interested in how this could impact the levels of essential trace metals in the water.
Lucas Porz, Wenyan Zhang, Nils Christiansen, Jan Kossack, Ute Daewel, and Corinna Schrum
Biogeosciences, 21, 2547–2570, https://doi.org/10.5194/bg-21-2547-2024, https://doi.org/10.5194/bg-21-2547-2024, 2024
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Seafloor sediments store a large amount of carbon, helping to naturally regulate Earth's climate. If disturbed, some sediment particles can turn into CO2, but this effect is not well understood. Using computer simulations, we found that bottom-contacting fishing gears release about 1 million tons of CO2 per year in the North Sea, one of the most heavily fished regions globally. We show how protecting certain areas could reduce these emissions while also benefitting seafloor-living animals.
Charlotte Eich, Mathijs van Manen, J. Scott P. McCain, Loay J. Jabre, Willem H. van de Poll, Jinyoung Jung, Sven B. E. H. Pont, Hung-An Tian, Indah Ardiningsih, Gert-Jan Reichart, Erin M. Bertrand, Corina P. D. Brussaard, and Rob Middag
EGUsphere, https://doi.org/10.5194/egusphere-2024-1508, https://doi.org/10.5194/egusphere-2024-1508, 2024
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Phytoplankton growth in the Southern Ocean (SO) is often limited by low iron (Fe) concentrations. Sea surface warming impacts Fe availability and can affect phytoplankton growth. We used Fe clean shipboard incubations to test how changes in Fe and temperature affect SO phytoplankton. Their abundances usually increased with Fe addition and temperature increase, with Fe being the major factor. These findings imply potential shifts in ecosystem structure, impacting food webs and elemental cycling.
Jiaying A. Guo, Robert F. Strzepek, Kerrie M. Swadling, Ashley T. Townsend, and Lennart T. Bach
Biogeosciences, 21, 2335–2354, https://doi.org/10.5194/bg-21-2335-2024, https://doi.org/10.5194/bg-21-2335-2024, 2024
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Ocean alkalinity enhancement aims to increase atmospheric CO2 sequestration by adding alkaline materials to the ocean. We assessed the environmental effects of olivine and steel slag powder on coastal plankton. Overall, slag is more efficient than olivine in releasing total alkalinity and, thus, in its ability to sequester CO2. Slag also had less environmental effect on the enclosed plankton communities when considering its higher CO2 removal potential based on this 3-week experiment.
Giovanni Galli, Sarah Wakelin, James Harle, Jason Holt, and Yuri Artioli
Biogeosciences, 21, 2143–2158, https://doi.org/10.5194/bg-21-2143-2024, https://doi.org/10.5194/bg-21-2143-2024, 2024
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This work shows that, under a high-emission scenario, oxygen concentration in deep water of parts of the North Sea and Celtic Sea can become critically low (hypoxia) towards the end of this century. The extent and frequency of hypoxia depends on the intensity of climate change projected by different climate models. This is the result of a complex combination of factors like warming, increase in stratification, changes in the currents and changes in biological processes.
Sandy E. Tenorio and Laura Farías
Biogeosciences, 21, 2029–2050, https://doi.org/10.5194/bg-21-2029-2024, https://doi.org/10.5194/bg-21-2029-2024, 2024
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Time series studies show that CH4 is highly dynamic on the coastal ocean surface and planktonic communities are linked to CH4 accumulation, as found in coastal upwelling off Chile. We have identified the crucial role of picoplankton (> 3 µm) in CH4 recycling, especially with the addition of methylated substrates (trimethylamine and methylphosphonic acid) during upwelling and non-upwelling periods. These insights improve understanding of surface ocean CH4 recycling, aiding CH4 emission estimates.
Charlotte A. J. Williams, Tom Hull, Jan Kaiser, Claire Mahaffey, Naomi Greenwood, Matthew Toberman, and Matthew R. Palmer
Biogeosciences, 21, 1961–1971, https://doi.org/10.5194/bg-21-1961-2024, https://doi.org/10.5194/bg-21-1961-2024, 2024
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Oxygen (O2) is a key indicator of ocean health. The risk of O2 loss in the productive coastal/continental slope regions is increasing. Autonomous underwater vehicles equipped with O2 optodes provide lots of data but have problems resolving strong vertical O2 changes. Here we show how to overcome this and calculate how much O2 is supplied to the low-O2 bottom waters via mixing. Bursts in mixing supply nearly all of the O2 to bottom waters in autumn, stopping them reaching ecologically low levels.
Sabine Schmidt and Ibrahima Iris Diallo
Biogeosciences, 21, 1785–1800, https://doi.org/10.5194/bg-21-1785-2024, https://doi.org/10.5194/bg-21-1785-2024, 2024
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Along the French coast facing the Bay of Biscay, the large Gironde and Loire estuaries suffer from hypoxia. This prompted a study of the small Charente estuary located between them. This work reveals a minimum oxygen zone in the Charente estuary, which extends for about 25 km. Temperature is the main factor controlling the hypoxia. This calls for the monitoring of small turbid macrotidal estuaries that are vulnerable to hypoxia, a risk expected to increase with global warming.
Simone R. Alin, Jan A. Newton, Richard A. Feely, Samantha Siedlecki, and Dana Greeley
Biogeosciences, 21, 1639–1673, https://doi.org/10.5194/bg-21-1639-2024, https://doi.org/10.5194/bg-21-1639-2024, 2024
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We provide a new multi-stressor data product that allows us to characterize the seasonality of temperature, O2, and CO2 in the southern Salish Sea and delivers insights into the impacts of major marine heatwave and precipitation anomalies on regional ocean acidification and hypoxia. We also describe the present-day frequencies of temperature, O2, and ocean acidification conditions that cross thresholds of sensitive regional species that are economically or ecologically important.
Luisa Chiara Meiritz, Tim Rixen, Anja K. van der Plas, Tarron Lamont, and Niko Lahajnar
EGUsphere, https://doi.org/10.5194/egusphere-2024-700, https://doi.org/10.5194/egusphere-2024-700, 2024
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The transport of particles through the water column and their subsequent burial on the seafloor is an important process for carbon storage and the mediation of carbon dioxide in the oceans. Our results from the Benguela Upwelling System distinguish between the northern and southern parts of the study area and between passive (gravitational) and active (zooplankton) transport processes. The decomposition of organic matter is doubtlessly an important factor for the size of oxygen minimum zones.
Pamela Linford, Iván Pérez-Santos, Paulina Montero, Patricio A. Díaz, Claudia Aracena, Elías Pinilla, Facundo Barrera, Manuel Castillo, Aida Alvera-Azcárate, Mónica Alvarado, Gabriel Soto, Cécile Pujol, Camila Schwerter, Sara Arenas-Uribe, Pilar Navarro, Guido Mancilla-Gutiérrez, Robinson Altamirano, Javiera San Martín, and Camila Soto-Riquelme
Biogeosciences, 21, 1433–1459, https://doi.org/10.5194/bg-21-1433-2024, https://doi.org/10.5194/bg-21-1433-2024, 2024
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The Patagonian fjords comprise a world region where low-oxygen water and hypoxia conditions are observed. An in situ dataset was used to quantify the mechanism involved in the presence of these conditions in northern Patagonian fjords. Water mass analysis confirmed the contribution of Equatorial Subsurface Water in the advection of the low-oxygen water, and hypoxic conditions occurred when the community respiration rate exceeded the gross primary production.
Ting Wang, Buyun Du, Inke Forbrich, Jun Zhou, Joshua Polen, Elsie M. Sunderland, Prentiss H. Balcom, Celia Chen, and Daniel Obrist
Biogeosciences, 21, 1461–1476, https://doi.org/10.5194/bg-21-1461-2024, https://doi.org/10.5194/bg-21-1461-2024, 2024
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The strong seasonal increases of Hg in aboveground biomass during the growing season and the lack of changes observed after senescence in this salt marsh ecosystem suggest physiologically controlled Hg uptake pathways. The Hg sources found in marsh aboveground tissues originate from a mix of sources, unlike terrestrial ecosystems, where atmospheric GEM is the main source. Belowground plant tissues mostly take up Hg from soils. Overall, the salt marsh currently serves as a small net Hg sink.
Michael R. Roman, Andrew H. Altieri, Denise Breitburg, Erica Ferrer, Natalya D. Gallo, Shin-ichi Ito, Karin Limburg, Kenneth Rose, Moriaki Yasuhara, and Lisa A. Levin
EGUsphere, https://doi.org/10.5194/egusphere-2024-616, https://doi.org/10.5194/egusphere-2024-616, 2024
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Oxygen-depleted ocean waters have increased worldwide. In order to improve our understanding of the impacts of this oxygen loss on marine life it is essential that we develop reliable indicators that track the negative impacts of low oxygen. We review various indicators of oxygen stress for marine animals including their use, research needs and application to confront the challenges of ocean oxygen loss.
Eleanor Simpson, Debby Ianson, Karen E. Kohfeld, Ana C. Franco, Paul A. Covert, Marty Davelaar, and Yves Perreault
Biogeosciences, 21, 1323–1353, https://doi.org/10.5194/bg-21-1323-2024, https://doi.org/10.5194/bg-21-1323-2024, 2024
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Shellfish aquaculture operates in nearshore areas where data on ocean acidification parameters are limited. We show daily and seasonal variability in pH and saturation states of calcium carbonate at nearshore aquaculture sites in British Columbia, Canada, and determine the contributing drivers of this variability. We find that nearshore locations have greater variability than open waters and that the uptake of carbon by phytoplankton is the major driver of pH and saturation state variability.
S. Alejandra Castillo Cieza, Rachel H. R. Stanley, Pierre Marrec, Diana N. Fontaine, E. Taylor Crockford, Dennis J. McGillicuddy Jr., Arshia Mehta, Susanne Menden-Deuer, Emily E. Peacock, Tatiana A. Rynearson, Zoe O. Sandwith, Weifeng Zhang, and Heidi M. Sosik
Biogeosciences, 21, 1235–1257, https://doi.org/10.5194/bg-21-1235-2024, https://doi.org/10.5194/bg-21-1235-2024, 2024
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The coastal ocean in the northeastern USA provides many services, including fisheries and habitats for threatened species. In summer 2019, a bloom occurred of a large unusual phytoplankton, the diatom Hemiaulus, with nitrogen-fixing symbionts. This led to vast changes in productivity and grazing rates in the ecosystem. This work shows that the emergence of one species can have profound effects on ecosystem function. Such changes may become more prevalent as the ocean warms due to climate change.
Claudine Hauri, Brita Irving, Sam Dupont, Rémi Pagés, Donna D. W. Hauser, and Seth L. Danielson
Biogeosciences, 21, 1135–1159, https://doi.org/10.5194/bg-21-1135-2024, https://doi.org/10.5194/bg-21-1135-2024, 2024
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Arctic marine ecosystems are highly susceptible to impacts of climate change and ocean acidification. We present pH and pCO2 time series (2016–2020) from the Chukchi Ecosystem Observatory and analyze the drivers of the current conditions to get a better understanding of how climate change and ocean acidification could affect the ecological niches of organisms.
William Hiles, Lucy C. Miller, Craig Smeaton, and William E. N. Austin
Biogeosciences, 21, 929–948, https://doi.org/10.5194/bg-21-929-2024, https://doi.org/10.5194/bg-21-929-2024, 2024
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Saltmarsh soils may help to limit the rate of climate change by storing carbon. To understand their impacts, they must be accurately mapped. We use drone data to estimate the size of three saltmarshes in NE Scotland. We find that drone imagery, combined with tidal data, can reliably inform our understanding of saltmarsh size. When compared with previous work using vegetation communities, we find that our most reliable new estimates of stored carbon are 15–20 % smaller than previously estimated.
De'Marcus Robinson, Anh L. D. Pham, David J. Yousavich, Felix Janssen, Frank Wenzhöfer, Eleanor C. Arrington, Kelsey M. Gosselin, Marco Sandoval-Belmar, Matthew Mar, David L. Valentine, Daniele Bianchi, and Tina Treude
Biogeosciences, 21, 773–788, https://doi.org/10.5194/bg-21-773-2024, https://doi.org/10.5194/bg-21-773-2024, 2024
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The present study suggests that high release of ferrous iron from the seafloor of the oxygen-deficient Santa Barabara Basin (California) supports surface primary productivity, creating positive feedback on seafloor iron release by enhancing low-oxygen conditions in the basin.
David J. Yousavich, De'Marcus Robinson, Xuefeng Peng, Sebastian J. E. Krause, Frank Wenzhöfer, Felix Janssen, Na Liu, Jonathan Tarn, Franklin Kinnaman, David L. Valentine, and Tina Treude
Biogeosciences, 21, 789–809, https://doi.org/10.5194/bg-21-789-2024, https://doi.org/10.5194/bg-21-789-2024, 2024
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Declining oxygen (O2) concentrations in coastal oceans can threaten people’s ways of life and food supplies. Here, we investigate how mats of bacteria that proliferate on the seafloor of the Santa Barbara Basin sustain and potentially worsen these O2 depletion events through their unique chemoautotrophic metabolism. Our study shows how changes in seafloor microbiology and geochemistry brought on by declining O2 concentrations can help these mats grow as well as how that growth affects the basin.
Krysten Rutherford, Katja Fennel, Lina Garcia Suarez, and Jasmin G. John
Biogeosciences, 21, 301–314, https://doi.org/10.5194/bg-21-301-2024, https://doi.org/10.5194/bg-21-301-2024, 2024
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We downscaled two mid-century (~2075) ocean model projections to a high-resolution regional ocean model of the northwest North Atlantic (NA) shelf. In one projection, the NA shelf break current practically disappears; in the other it remains almost unchanged. This leads to a wide range of possible future shelf properties. More accurate projections of coastal circulation features would narrow the range of possible outcomes of biogeochemical projections for shelf regions.
Lennart Thomas Bach
Biogeosciences, 21, 261–277, https://doi.org/10.5194/bg-21-261-2024, https://doi.org/10.5194/bg-21-261-2024, 2024
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Ocean alkalinity enhancement (OAE) is a widely considered marine carbon dioxide removal method. OAE aims to accelerate chemical rock weathering, which is a natural process that slowly sequesters atmospheric carbon dioxide. This study shows that the addition of anthropogenic alkalinity via OAE can reduce the natural release of alkalinity and, therefore, reduce the efficiency of OAE for climate mitigation. However, the additionality problem could be mitigated via a variety of activities.
Tsuneo Ono, Daisuke Muraoka, Masahiro Hayashi, Makiko Yorifuji, Akihiro Dazai, Shigeyuki Omoto, Takehiro Tanaka, Tomohiro Okamura, Goh Onitsuka, Kenji Sudo, Masahiko Fujii, Ryuji Hamanoue, and Masahide Wakita
Biogeosciences, 21, 177–199, https://doi.org/10.5194/bg-21-177-2024, https://doi.org/10.5194/bg-21-177-2024, 2024
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We carried out parallel year-round observations of pH and related parameters in five stations around the Japan coast. It was found that short-term acidified situations with Omega_ar less than 1.5 occurred at four of five stations. Most of such short-term acidified events were related to the short-term low salinity event, and the extent of short-term pH drawdown at high freshwater input was positively correlated with the nutrient concentration of the main rivers that flow into the coastal area.
K. Mareike Paul, Martijn Hermans, Sami A. Jokinen, Inda Brinkmann, Helena L. Filipsson, and Tom Jilbert
Biogeosciences, 20, 5003–5028, https://doi.org/10.5194/bg-20-5003-2023, https://doi.org/10.5194/bg-20-5003-2023, 2023
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Seawater naturally contains trace metals such as Mo and U, which accumulate under low oxygen conditions on the seafloor. Previous studies have used sediment Mo and U contents as an archive of changing oxygen concentrations in coastal waters. Here we show that in fjords the use of Mo and U for this purpose may be impaired by additional processes. Our findings have implications for the reliable use of Mo and U to reconstruct oxygen changes in fjords.
Hannah Sharpe, Michel Gosselin, Catherine Lalande, Alexandre Normandeau, Jean-Carlos Montero-Serrano, Khouloud Baccara, Daniel Bourgault, Owen Sherwood, and Audrey Limoges
Biogeosciences, 20, 4981–5001, https://doi.org/10.5194/bg-20-4981-2023, https://doi.org/10.5194/bg-20-4981-2023, 2023
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We studied the impact of submarine canyon processes within the Pointe-des-Monts system on biogenic matter export and phytoplankton assemblages. Using data from three oceanographic moorings, we show that the canyon experienced two low-amplitude sediment remobilization events in 2020–2021 that led to enhanced particle fluxes in the deep-water column layer > 2.6 km offshore. Sinking phytoplankton fluxes were lower near the canyon compared to background values from the lower St. Lawrence Estuary.
Dewi Langlet, Florian Mermillod-Blondin, Noémie Deldicq, Arthur Bauville, Gwendoline Duong, Lara Konecny, Mylène Hugoni, Lionel Denis, and Vincent M. P. Bouchet
Biogeosciences, 20, 4875–4891, https://doi.org/10.5194/bg-20-4875-2023, https://doi.org/10.5194/bg-20-4875-2023, 2023
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Benthic foraminifera are single-cell marine organisms which can move in the sediment column. They were previously reported to horizontally and vertically transport sediment particles, yet the impact of their motion on the dissolved fluxes remains unknown. Using microprofiling, we show here that foraminiferal burrow formation increases the oxygen penetration depth in the sediment, leading to a change in the structure of the prokaryotic community.
Masahiko Fujii, Ryuji Hamanoue, Lawrence Patrick Cases Bernardo, Tsuneo Ono, Akihiro Dazai, Shigeyuki Oomoto, Masahide Wakita, and Takehiro Tanaka
Biogeosciences, 20, 4527–4549, https://doi.org/10.5194/bg-20-4527-2023, https://doi.org/10.5194/bg-20-4527-2023, 2023
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This is the first study of the current and future impacts of climate change on Pacific oyster farming in Japan. Future coastal warming and acidification may affect oyster larvae as a result of longer exposure to lower-pH waters. A prolonged spawning period may harm oyster processing by shortening the shipping period and reducing oyster quality. To minimize impacts on Pacific oyster farming, in addition to mitigation measures, local adaptation measures may be required.
Taketoshi Kodama, Atsushi Nishimoto, Ken-ichi Nakamura, Misato Nakae, Naoki Iguchi, Yosuke Igeta, and Yoichi Kogure
Biogeosciences, 20, 3667–3682, https://doi.org/10.5194/bg-20-3667-2023, https://doi.org/10.5194/bg-20-3667-2023, 2023
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Carbon and nitrogen are essential elements for organisms; their stable isotope ratios (13C : 12C, 15N : 14N) are useful tools for understanding turnover and movement in the ocean. In the Sea of Japan, the environment is rapidly being altered by human activities. The 13C : 12C of small organic particles is increased by active carbon fixation, and phytoplankton growth increases the values. The 15N : 14N variations suggest that nitrates from many sources contribute to organic production.
Aubin Thibault de Chanvalon, George W. Luther, Emily R. Estes, Jennifer Necker, Bradley M. Tebo, Jianzhong Su, and Wei-Jun Cai
Biogeosciences, 20, 3053–3071, https://doi.org/10.5194/bg-20-3053-2023, https://doi.org/10.5194/bg-20-3053-2023, 2023
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The intensity of the oceanic trap of CO2 released by anthropogenic activities depends on the alkalinity brought by continental weathering. Between ocean and continent, coastal water and estuaries can limit or favour the alkalinity transfer. This study investigate new interactions between dissolved metals and alkalinity in the oxygen-depleted zone of estuaries.
Joonas J. Virtasalo, Peter Österholm, and Eero Asmala
Biogeosciences, 20, 2883–2901, https://doi.org/10.5194/bg-20-2883-2023, https://doi.org/10.5194/bg-20-2883-2023, 2023
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We mixed acidic metal-rich river water from acid sulfate soils and seawater in the laboratory to study the flocculation of dissolved metals and organic matter in estuaries. Al and Fe flocculated already at a salinity of 0–2 to large organic flocs (>80 µm size). Precipitation of Al and Fe hydroxide flocculi (median size 11 µm) began when pH exceeded ca. 5.5. Mn transferred weakly to Mn hydroxides and Co to the flocs. Up to 50 % of Cu was associated with the flocs, irrespective of seawater mixing.
Moritz Baumann, Allanah Joy Paul, Jan Taucher, Lennart Thomas Bach, Silvan Goldenberg, Paul Stange, Fabrizio Minutolo, and Ulf Riebesell
Biogeosciences, 20, 2595–2612, https://doi.org/10.5194/bg-20-2595-2023, https://doi.org/10.5194/bg-20-2595-2023, 2023
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The sinking velocity of marine particles affects how much atmospheric CO2 is stored inside our oceans. We measured particle sinking velocities in the Peruvian upwelling system and assessed their physical and biochemical drivers. We found that sinking velocity was mainly influenced by particle size and porosity, while ballasting minerals played only a minor role. Our findings help us to better understand the particle sinking dynamics in this highly productive marine system.
Kyle E. Hinson, Marjorie A. M. Friedrichs, Raymond G. Najjar, Maria Herrmann, Zihao Bian, Gopal Bhatt, Pierre St-Laurent, Hanqin Tian, and Gary Shenk
Biogeosciences, 20, 1937–1961, https://doi.org/10.5194/bg-20-1937-2023, https://doi.org/10.5194/bg-20-1937-2023, 2023
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Climate impacts are essential for environmental managers to consider when implementing nutrient reduction plans designed to reduce hypoxia. This work highlights relative sources of uncertainty in modeling regional climate impacts on the Chesapeake Bay watershed and consequent declines in bay oxygen levels. The results demonstrate that planned water quality improvement goals are capable of reducing hypoxia levels by half, offsetting climate-driven impacts on terrestrial runoff.
Linquan Mu, Jaime B. Palter, and Hongjie Wang
Biogeosciences, 20, 1963–1977, https://doi.org/10.5194/bg-20-1963-2023, https://doi.org/10.5194/bg-20-1963-2023, 2023
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Enhancing ocean alkalinity accelerates carbon dioxide removal from the atmosphere. We hypothetically added alkalinity to the Amazon River and examined the increment of the carbon uptake by the Amazon plume. We also investigated the minimum alkalinity addition in which this perturbation at the river mouth could be detected above the natural variability.
Karl M. Attard, Anna Lyssenko, and Iván F. Rodil
Biogeosciences, 20, 1713–1724, https://doi.org/10.5194/bg-20-1713-2023, https://doi.org/10.5194/bg-20-1713-2023, 2023
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Aquatic plants produce a large amount of organic matter through photosynthesis that, following erosion, is deposited on the seafloor. In this study, we show that plant detritus can trigger low-oxygen conditions (hypoxia) in shallow coastal waters, making conditions challenging for most marine animals. We propose that the occurrence of hypoxia may be underestimated because measurements typically do not consider the region closest to the seafloor, where detritus accumulates.
M. James McLaughlin, Cindy Bessey, Gary A. Kendrick, John Keesing, and Ylva S. Olsen
Biogeosciences, 20, 1011–1026, https://doi.org/10.5194/bg-20-1011-2023, https://doi.org/10.5194/bg-20-1011-2023, 2023
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Coral reefs face increasing pressures from environmental change at present. The coral reef framework is produced by corals and calcifying algae. The Kimberley region of Western Australia has escaped land-based anthropogenic impacts. Specimens of the dominant coral and algae were collected from Browse Island's reef platform and incubated in mesocosms to measure calcification and production patterns of oxygen. This study provides important data on reef building and climate-driven effects.
Patricia Ayón Dejo, Elda Luz Pinedo Arteaga, Anna Schukat, Jan Taucher, Rainer Kiko, Helena Hauss, Sabrina Dorschner, Wilhelm Hagen, Mariona Segura-Noguera, and Silke Lischka
Biogeosciences, 20, 945–969, https://doi.org/10.5194/bg-20-945-2023, https://doi.org/10.5194/bg-20-945-2023, 2023
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Ocean upwelling regions are highly productive. With ocean warming, severe changes in upwelling frequency and/or intensity and expansion of accompanying oxygen minimum zones are projected. In a field experiment off Peru, we investigated how different upwelling intensities affect the pelagic food web and found failed reproduction of dominant zooplankton. The changes projected could severely impact the reproductive success of zooplankton communities and the pelagic food web in upwelling regions.
Mathilde Jutras, Alfonso Mucci, Gwenaëlle Chaillou, William A. Nesbitt, and Douglas W. R. Wallace
Biogeosciences, 20, 839–849, https://doi.org/10.5194/bg-20-839-2023, https://doi.org/10.5194/bg-20-839-2023, 2023
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The deep waters of the lower St Lawrence Estuary and gulf have, in the last decades, experienced a strong decline in their oxygen concentration. Below 65 µmol L-1, the waters are said to be hypoxic, with dire consequences for marine life. We show that the extent of the hypoxic zone shows a seven-fold increase in the last 20 years, reaching 9400 km2 in 2021. After a stable period at ~ 65 µmol L⁻¹ from 1984 to 2019, the oxygen level also suddenly decreased to ~ 35 µmol L-1 in 2020.
Sachi Umezawa, Manami Tozawa, Yuichi Nosaka, Daiki Nomura, Hiroji Onishi, Hiroto Abe, Tetsuya Takatsu, and Atsushi Ooki
Biogeosciences, 20, 421–438, https://doi.org/10.5194/bg-20-421-2023, https://doi.org/10.5194/bg-20-421-2023, 2023
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We conducted repetitive observations in Funka Bay, Japan, during the spring bloom 2019. We found nutrient concentration decreases in the dark subsurface layer during the bloom. Incubation experiments confirmed that diatoms could consume nutrients at a substantial rate, even in darkness. We concluded that the nutrient reduction was mainly caused by nutrient consumption by diatoms in the dark.
Dirk Jong, Lisa Bröder, Tommaso Tesi, Kirsi H. Keskitalo, Nikita Zimov, Anna Davydova, Philip Pika, Negar Haghipour, Timothy I. Eglinton, and Jorien E. Vonk
Biogeosciences, 20, 271–294, https://doi.org/10.5194/bg-20-271-2023, https://doi.org/10.5194/bg-20-271-2023, 2023
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With this study, we want to highlight the importance of studying both land and ocean together, and water and sediment together, as these systems function as a continuum, and determine how organic carbon derived from permafrost is broken down and its effect on global warming. Although on the one hand it appears that organic carbon is removed from sediments along the pathway of transport from river to ocean, it also appears to remain relatively ‘fresh’, despite this removal and its very old age.
Georgia Filippi, Manos Dassenakis, Vasiliki Paraskevopoulou, and Konstantinos Lazogiannis
Biogeosciences, 20, 163–189, https://doi.org/10.5194/bg-20-163-2023, https://doi.org/10.5194/bg-20-163-2023, 2023
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The pollution of the western Saronikos Gulf from heavy metals has been examined through the study of marine sediment cores. It is a deep gulf (maximum depth 440 m) near Athens affected by industrial and volcanic activity. Eight cores were received from various stations and depths and analysed for their heavy metal content and geochemical characteristics. The results were evaluated by using statistical methods, environmental indicators and comparisons with old data.
Jing He and Michael D. Tyka
Biogeosciences, 20, 27–43, https://doi.org/10.5194/bg-20-27-2023, https://doi.org/10.5194/bg-20-27-2023, 2023
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Recently, ocean alkalinity enhancement (OAE) has gained interest as a scalable way to address the urgent need for negative CO2 emissions. In this paper we examine the capacity of different coastlines to tolerate alkalinity enhancement and the time scale of CO2 uptake following the addition of a given quantity of alkalinity. The results suggest that OAE has significant potential and identify specific favorable and unfavorable coastlines for its deployment.
Arnaud Laurent, Haiyan Zhang, and Katja Fennel
Biogeosciences, 19, 5893–5910, https://doi.org/10.5194/bg-19-5893-2022, https://doi.org/10.5194/bg-19-5893-2022, 2022
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The Changjiang is the main terrestrial source of nutrients to the East China Sea (ECS). Nutrient delivery to the ECS has been increasing since the 1960s, resulting in low oxygen (hypoxia) during phytoplankton decomposition in summer. River phosphorus (P) has increased less than nitrogen, and therefore, despite the large nutrient delivery, phytoplankton growth can be limited by the lack of P. Here, we investigate this link between P limitation, phytoplankton production/decomposition, and hypoxia.
Cited articles
Barrón, C., Duarte, C. M., Frankignoulle, M., and Borges, A. V.: Organic
carbon metabolism and carbonate dynamics in a Mediterranean seagrass
(Posidonia oceanica) meadow, Estuar. Coasts, 29, 417–426,
https://doi.org/10.1007/BF02784990, 2006.
Bosence, D. W. J.: Biogenic Carbonate Production in Florida Bay, Bull. Mar.
Sci., 44, 419–433, 1989.
Bosence, D. W. J., Rowlands, R. J., and Quine, M. L.: Sedimentology and
budget of a Recent carbonate mound, Florida Keys, Sedimentology, 32,
317–343, https://doi.org/10.1111/j.1365-3091.1985.tb00515.x, 1985.
Bouillon, S., Dehairs, F., Velimirov, B., Abril, G., and Borges, A. V.:
Dynamics of organic and inorganic carbon across contiguous mangrove and
seagrass systems (Gazi Bay, Kenya), J. Geophys. Res.-Biogeo., 112,
1–14, https://doi.org/10.1029/2006JG000325, 2007.
Brodersen, K. E., Trevathan-tackett, S. M., Nielsen, D. A., Macreadie, P.
I., and Durako, M. J.: Oxygen Consumption and Sulfate Reduction in Vegetated
Coastal Habitats : Effects of Physical Disturbance, Front. Mar. Sci.,
6, 1–13, https://doi.org/10.3389/fmars.2019.00014, 2019.
Burdige, D. J. and Zimmerman, R. C.: Impact of Sea Grass Density on
Carbonate Dissolution in Bahamian Sediments, Limnol. Oceanogr., 47,
1751–1763, https://doi.org/10.4319/lo.2002.47.6.1751, 2002.
Burdige, D. J., Hu, X., and Zimmerman, R. C.: The widespread occurrence of
coupled carbonate dissolution/reprecipitation in surface sediments on the
Bahamas Bank, Am. J. Sci., 310, 492–521, https://doi.org/10.2475/06.2010.03, 2010.
Camp, E. F., Suggett, D. J., Gendron, G., Jompa, J., Manfrino, C., and
Smith, D. J.: Mangrove and Seagrass Beds Provide Different Biogeochemical
Services for Corals Threatened by Climate Change, Front. Mar. Sci.,
3, 1–16, https://doi.org/10.3389/fmars.2016.00052, 2016.
Challener, R. C., Robbins, L. L., and Mcclintock, J. B.: Variability of the
carbonate chemistry in a shallow, seagrass-dominated ecosystem: Implications
for ocean acidification experiments, Mar. Freshw. Res., 67, 163–172,
https://doi.org/10.1071/MF14219, 2016.
Chapin, F. S., Pace, M. L., Harden, J. W., Schulze, E.-D., Randerson, J.
T., Harmon, M. E., McGuire, A. D., Woodwell, G. M., Wirth, C., Clark, D. A.,
Neff, J. C., Baldocchi, D. D., Lovett, G. M., Goulden, M. L., Howarth, R.
W., Valentini, R., Sala, O. E., Aber, J. D., Melillo, J. M., Matson, P. A.,
Schimel, D. S., Ryan, M. G., Houghton, R. A., Cole, J. J., Schlesinger, W.
H., Running, S. W., Heimann, M., Mooney, H. A., and Rastetter, E. B.:
Reconciling Carbon-cycle Concepts, Terminology, and Methods, Ecosystems,
9, 1041–1050, https://doi.org/10.1007/s10021-005-0105-7, 2006.
Corbett, D. R., Chanton, J., Burnett, W., Dillon, K., Rutkowski, C., and
Fourqurean, J. W.: Patterns of groundwater discharge into Florida Bay,
Limnol. Oceanogr., 44, 1045–1055, https://doi.org/10.4319/lo.1999.44.4.1045, 1999.
Cyronak, T., Santos, I. R., McMahon, A., and Eyre, B. D.: Carbon cycling
hysteresis in permeable carbonate sands over a diel cycle: Implications for
ocean acidificationn, Limnol. Oceanogr., 58, 131–143,
https://doi.org/10.4319/lo.2013.58.1.0131, 2013.
Cyronak, T., Andersson, A. J., D'Angelo, S., Bresnahan, P. J., Davidson, C.
C. C., Griffin, A., Kindeberg, T., Pennise, J., Takeshita, Y., and White,
M.: Short-Term Spatial and Temporal Carbonate Chemistry Variability in Two
Contrasting Seagrass Meadows: Implications for pH Buffering Capacities,
Estuar. Coasts, 5, 1–15, https://doi.org/10.1007/s12237-017-0356-5, 2018.
Deines, P.: The isotopic composition of reduced organic carbon, in: Handbook of Environmental Isotope Geochemistry,
vol. 1, edited by: Fritz, P.
and Fontes, J. C., Elsevier, New York, pp. 329–406, 1980.
Dickson, A. G. and Millero, F. J.: A comparison of the equilibrium constants for the dissociation of carbonic acid in seawater media, Deep-Sea Res., 34, 1733–1743, 1987.
Dickson, A. G., Afghan, J. D., and Anderson, G. C.: Reference materials for
oceanic CO2 analysis: a method for the certification of total alkalinity,
Marine Chem., 80, 185–197, 2003.
Dickson, A. G., Sabine, C. L., and Christian, J. R.: Guide to Best Practices for
Ocean CO2 Measurements, PICES Special Publication, 3, 2007.
Duarte, C. M., Middelburg, J. J., and Caraco, N.: Major role of marine vegetation on the oceanic carbon cycle, Biogeosciences, 2, 1–8, https://doi.org/10.5194/bg-2-1-2005, 2005.
Duarte, C. M., Marbà, N., Gacia, E., Fourqurean, J. W., Beggins, J.,
Barrón, C., and Apostolaki, E. T.: Seagrass community metabolism:
Assessing the carbon sink capacity of seagrass meadows, Global Biogeochem.
Cycles, 24, 1–8, https://doi.org/10.1029/2010GB003793, 2010.
DuFore, C. M.: Spatial and Temporal Variations in the Air-Sea Carbon Dioxide
Fluxes of Florida Bay, dissertation, University of South Florida, Tampa, FL,
2012.
Enríquez, S. and Schubert, N.: Direct contribution of the seagrass
Thalassia testudinum to lime mud production, Nat. Commun., 5, 1–12,
https://doi.org/10.1038/ncomms4835, 2014.
Eyre, B. D. and Ferguson, A. J. P.: Comparison of carbon production and
decomposition, benthic nutrient fluxes and denitrification in seagrass,
phytoplankton, benthic microalgae- and macroalgae-dominated warm-temperate
Australian lagoons, Mar. Ecol. Prog. Ser., 229, 43–59,
https://doi.org/10.3354/meps229043, 2002.
Fourqurean, J., Zieman, J., and Powell, G.: Phosphorus limitation of primary
production in Florida Bay: Evidence from
Fourqurean, J. W., Escoria, S. P., Anderson, W. T., and Zieman, J. C.:
Spatial and Seasonal Variability in Elemental Content, δ13C, and
δ15N of Thalassia testudinum from South Florida and Its Implications
for Ecosystem Studies, Estuaries, 28, 447–461, 2005.
Fourqurean, J. W., Duarte, C. M., Kennedy, H., Marbà, N., Holmer, M.,
Mateo, M. A., Apostolaki, E. T., Kendrick, G. A., Krause-Jensen, D.,
McGlathery, K. J., and Serrano, O.: Seagrass ecosystems as a globally
significant carbon stock, Nat. Geosci., 5, 505–509,
https://doi.org/10.1038/ngeo1477, 2012a.
Fourqurean, J. W., Kendrick, G. A., Collins, L. S., Chambers, R. M., and
Vanderklift, M. A.: Carbon, nitrogen and phosphorus storage in subtropical
seagrass meadows: Examples from Florida Bay and Shark Bay, Mar. Freshw.
Res., 63, 967–983, https://doi.org/10.1071/MF12101, 2012b.
Fourqurean, J. W., Manuel, S. A., Coates, K. A., Kenworthy, W. J., and Boyer, J. N.: Water quality, isoscapes and stoichioscapes of seagrasses indicate general P limitation and unique N cycling in shallow water benthos of Bermuda, Biogeosciences, 12, 6235–6249, https://doi.org/10.5194/bg-12-6235-2015, 2015.
Frankovich, T. A. and Zieman, J. C.: Total epiphyte and epiphytic carbonate
production on Thalassia testudinum across Florida Bay, Bull. Mar. Sci.,
54, 679–695, 1994.
Ganguly, D., Singh, G., Ramachandran, P., Selvam, A. P., Banerjee, K., and
Ramachandran, R.: Seagrass metabolism and carbon dynamics in a tropical
coastal embayment, Ambio, 46, 667–679, https://doi.org/10.1007/s13280-017-0916-8,
2017.
Hendriks, I. E., Olsen, Y. S., Ramajo, L., Basso, L., Steckbauer, A., Moore, T. S., Howard, J., and Duarte, C. M.: Photosynthetic activity buffers ocean acidification in seagrass meadows, Biogeosciences, 11, 333–346, https://doi.org/10.5194/bg-11-333-2014, 2014.
Hines, M. and Lyons, W.: Biogeochemistry of Nearshore Bermuda Sediments. I.
Sulfate Reduction Rates and Nutrient Generation, Mar. Ecol. Prog. Ser.,
8, 87–94, https://doi.org/10.3354/meps008087, 2007
Ho, D. T., Law, C. S., Smith, M. J., Schlosser, P., Harvey, M., and Hill, P.:
Measurements of air-sea gas exchange at high wind speeds in the Southern
Ocean: Implications for global parameterizations, Geophys. Res. Lett.,
33, L16611, https://doi.org/10.1029/2006GL026817, 2006.
Ho, D. T., Coffineau, N., Hickman, B., Chow, N., Koffman, T., and Schlosser, P.: Influence of current velocity and wind speed on air-water gas
exchange in a mangrove estuary, Geophys. Res. Lett., 3813–3821,
https://doi.org/10.1002/2016GL068727,
2016.
Ho, D. T., Ferrón, S., Engel, V. C., Anderson, W. T., Swart, P. K., Price, R. M., and Barbero, L.: Dissolved carbon biogeochemistry and export in mangrove-dominated rivers of the Florida Everglades, Biogeosciences, 14, 2543–2559, https://doi.org/10.5194/bg-14-2543-2017, 2017.
Holmer, M. and Nielsen, S. L.: Sediment sulfur dynamics related to
biomass- density patterns in Zostera marina (eelgrass) beds, Mar. Ecol.
Prog. Ser., 146, 163–171, 1997.
Holmer, M., Andersen, F. O., Nielsen, S. L., and Boschker, H. T. S.: The
importance of mineralization based on sulfate reduction for nutrient
regeneration in tropical seagrass sediments, Aquat. Bot., 71, 1–17,
https://doi.org/10.1016/S0304-3770(01)00170-X, 2001.
Holmer, M., Duarte, C. M., and Marba, N.: Sulfur cycling and seagrass (Posidonia oceanica) status in carbonate sediments, Biogeochemistry, 66, 223–239, 2003.
Hopkinson, C. S. and Smith, E. M.: Estuarine respiration: An overview of benthic, pelagic and whole system respiration, in: Respiration in aquatic ecosystems, edited by: del Giorgio, P. A. and Williams, P., Oxford Univ. Press., 122–146, https://doi.org/10.1093/acprof:oso/9780198527084.003.0008, 2007.
Howard, J. L., Creed, J. C., Aguiar, M. V. P., and Fouqurean, J. W.: CO2
released by carbonate sediment production in some coastal areas may offset
the benefits of seagrass “Blue Carbon” storage, Limnol. Oceanogr., 63,
160–172, https://doi.org/10.1002/lno.10621, 2018.
Jensen, H. S., McGlathery, K., Marino, J. R., and Howarth, R. W.: Forms and
availability of sediment phosphorus in carbonate sand of Bermuda seagrass
beds, Limnol. Oceanogr., 43, 799–810, 1998.
Jensen, H. S., Nielsen, O. I., Koch, M. S., and de Vicente, I.: Phosphorus
release with carbonate dissolution coupled to sulfide oxidation in Florida
Bay seagrass sediments, Limnol. Oceanogr., 54, 1753–1764,
https://doi.org/10.4319/lo.2009.54.5.1753, 2009.
Karlsson, J., Jansson, M., and Jonsson, A.: Respiration of
allochthonous organic carbon in unproductive forest lakes determined by the
Keeling plot method, Limnol. Oceanogr., 52, 603–608, https://doi.org/10.4319/lo.2007.52.2.0603, 2007.
Koweek, D. A., Zimmerman, R. C., Hewett, K. M., Gaylord, B., Giddings, S.
N., Nickols, K. J., Ruesink, J., Stachowicz, J. J., Takeshita, Y., and
Caldeira, K.: Expected limits on the ocean acidi fi cation buffering
potential of a temperate seagrass meadow, Ecol. Appl., 28, 1694–1714,
https://doi.org/10.1002/eap.1771, 2018.
Large, W. and Pond, S.: Open Ocean Momentum Flux Measurements in Moderate
to Strong Winds, J. Phys. Oceanogr., 11, 324–336, 1981.
Lee, R. J. and Saylor, J. R.: The effect of a surfactant monolayer
on oxygen transfer across an air/water interface during mixed convection.
Int. J. Heat Mass Tran., 53, 3405–3413,
https://doi.org/10.1016/j.ijheatmasstransfer.2010.03.037, 2010.
Lewis, E. and Wallace, D. W. R.: Program developed for CO2 system
calculations, Rep. ORNL/CDLAC-105, Carbon Dioxide Inf. and Anal. Cent., Oak
Ridge Natl. Lab., U.S. Dep. of Energy, Oak Ridge, Tenn., 1998.
Long, M., Berg, P., and Falter, J.: Seagrass metabolism across a
productivity gradient using the eddy covariance, Eulerian control volume,
and biomass addition techniques, J. Geophys. Res.-Ocean., 120, 2676–2700,
https://doi.org/10.1002/2014JC010441, 2015a.
Long, M. H., Charette, M. A., Martin, W. R., and Mccorkle, D. C.: Oxygen
metabolism and pH in coastal ecosystems: Eddy Covariance Hydrogen ion and
Oxygen Exchange System (ECHOES), Limnol. Oceanogr. Methods, 13, 438–450,
https://doi.org/10.1002/lom3.10038, 2015b.
MacIntyre, S., Jonsson, A., Jansson, M., Aberg, J., Turney, D. E., and
Miller, S. D.: Buoyancy flux, turbulence, and the gas transfer
coefficient in a stratified lake, Geophys. Res. Lett., 37,
2–6, https://doi.org/10.1029/2010GL044164, 2010.
Manzello, D. P., Enochs, I. C., Melo, N. Gledhill, D. K., and Johns, E. M.:
Ocean acidification refugia of the florida reef tract, PLoS One, 7, 1–10, https://doi.org/10.1371/journal.pone.0041715,
2012.
Mazarrasa, I., Marbà, N., Lovelock, C. E., Serrano, O., Lavery, P. S., Fourqurean, J. W., Kennedy, H., Mateo, M. A., Krause-Jensen, D., Steven, A. D. L., and Duarte, C. M.: Seagrass meadows as a globally significant carbonate reservoir, Biogeosciences, 12, 4993–5003, https://doi.org/10.5194/bg-12-4993-2015, 2015.
McDougall, T. J. and Barker, P. M.: Getting started with TEOS-10 and the
Gibbs Seawater (GSW) Oceanographic Toolbox, 28 pp., SCOR/IAPSO WG127, ISBN
978-0-646-55621-5, 2010.
McKenna, S. P. and McGillis, W. R.: The role of free-surface
turbulence and surfactants in air-water gas transfer, Int. J. Heat Mass Tran., 47, 539–553,
https://doi.org/10.1016/j.ijheatmasstransfer.2003.06.001, 2004.
McMahon, A., Santos, I. R., Schulz, K. G., Cyronak, T., and Maher, D. T.: Determining coral reef calcification and primary production using
automated alkalinity, pH and pCO2 measurements at high temporal resolution.
Estuarine, Coast. Shelf Sci., 209, 80–88, https://doi.org/10.1016/j.ecss.2018.04.041,
2018.
Mehrbach, C., Culberson, C. H., Hawley, J. E., and Pytkowicz, R. M.:
Measurement of the apparent dissociation constants of carbonic acid in
seawater at atmospheric pressure, Limnol. Oceanogr., 18, 897–907,
https://doi.org/10.4319/lo.1973.18.6.0897, 1973.
Middelburg, J. J.: Marine Carbon Biogeochemistry, Springer Briefs in Earth
System Sciences, 1, https://doi.org/10.1007/978-3-030-10822-9_1,
2019.
Millero, F., Hiscock, W., Huang, R., Roche, M., and Zhang, J.: Seasonal Variation of the
Carbonate System in Florida Bay, Bull. Mar. Sci., 68, 101–123, 2001.
Nixon, S. W., Oviatt, C. A., Garber, J., and Lee, V.: Diel Metabolism and Nutrient Dynamics in a Salt Marsh Embayment, Ecology, 57, 740–750, 1976.
Odum, H. T. and Hoskin, C. M.: Comparative studies on the metabolism of
marine waters, Publ. Inst. Mar. Sci., Univ. Tex., Texas, 1958.
Pacella, S. R., Brown, C. A., Waldbusser, G. G., Labiosa, R. G., and Hales,
B.: Seagrass habitat metabolism increases short-term extremes and long-term
offset of CO2 under future ocean acidification, P. Natl. Acad. Sci. USA, 115, 1–6,
https://doi.org/10.23719/1407616, 2018.
Perez, D. I., Phinn, S. R., Roelfsema, C. M., Shaw, E., Johnston, L., and
Iguel, J.: Primary Production and Calcification Rates of Algae-Dominated
Reef Flat and Seagrass Communities, J. Geophys. Res.-Biogeo., 123,
2362–2375, https://doi.org/10.1029/2017JG004241, 2018.
Podgrajsek, E., Sahleìe, E., and Rutgersson, A.: Diel cycle of
lake-air CO2 flux from a shallow lake and the impact of waterside convection
on the transfer velocity, J. Geophys. Res.-Biogeo.,
119, 487–507, https://doi.org/10.1002/2014JG002781, 2014.
Raymond, P. A. and Cole, J. J.: Gas Exchange in Rivers and Estuaries:
Choosing a Gas Transfer Velocity, Estuaries, 24, 312–317, 2001.
Röhr, M. E., Holmer, M., Baum, J. K., Björk, M., Chin, D.,
Chalifour, L., Cimon, S., Cusson, M., Dahl, M., and Deyanova, D.: Blue Carbon
Storage Capacity of Temperate Eelgrass (Zostera marina) Meadows, Glob.
Biochem. Cycles, 1457–1475, https://doi.org/10.1029/2018GB005941, 2018.
Ruiz-Halpern, S., Macko, S. A., and Fourqurean, J. W.: The effects of
manipulation of sedimentary iron and organic matter on sediment
biogeochemistry and seagrasses in a subtropical carbonate environment,
Biogeochemistry, 87, 113–126, https://doi.org/10.1007/s10533-007-9162-7, 2008.
Saderne, V., Geraldi, N. R., Macreadie, P. I., Maher, D. T., Middelburg, J.
J., Serrano, O., Almahasheer, H., Arias-Ortiz, A., Cusack, M., Eyre, B. D.,
Fourqurean, J. W., Kennedy, H., Krause-Jensen, D., Kuwae, T., Lavery, P. S.,
Lovelock, C. E., Marba, N., Masqué, P., Mateo, M. A., Mazarrasa, I.,
McGlathery, K. J., Oreska, M. P. J., Sanders, C. J., Santos, I. R., Smoak,
J. M., Tanaya, T., Watanabe, K., and Duarte, C. M.: Role of carbonate burial
in Blue Carbon budgets, Nat. Commun., 120, 29–38, https://doi.org/10.1038/s41467-019-08842-6,
2019.
Shaw, E. C., McNeil, B. I., and Tilbrook, B.: Impacts of ocean
acidification in naturally variable coral reef flat ecosystems, J.
Geophys. Res.-Oceans, 117, C3, https://doi.org/10.1029/2011jc007655, 2012.
Smith, A. C., Kostka, J. E., Devereux, R., and Yates, D. F.: Seasonal composition and activity of sulfate-reducing prokaryotic communities in seagrass bed sediments, Aquat. Microb. Ecol., 37, 183–195, https://doi.org/10.3354/ame037183, 2004.
Smith, S.: Physical, chemical and biological characteristics of CO2
gas flux across the air-water interface, Plant Cell Environ., 8,
387–398, 1985.
Stockman, K. W., Ginsburg, R. N., and Shinn, E. A.: The Production of Lime
Mud by Algae in South Florida, J. Sediment Petrol., 37, 633–648, 1967.
Turk, D., Yates, K. K., Esperance, C. L., Melo, N., Ramsewak, D., Dowd, M.,
Estrada, S. C., Herwitz, S. R., McGillis, W. R., Vega-Rodriguez, M.,
Toro-Farmer, G., L'Esperance, C., Melo, N., Ramsewak, D., Dowd, M., Estrada,
S. C., Muller-Karger, F. E., Herwitz, S. R., and McGillis, W. R.: Community
metabolism in shallow coral reef and seagrass ecosystems, lower Florida
Keys, Mar. Ecol. Prog. Ser., 538, 35–52, https://doi.org/10.3354/meps11385, 2015.
Unsworth, R. K. F., Collier, C. J., Henderson, G. M., and McKenzie, L. J.:
Tropical seagrass meadows modify seawater carbon chemistry: Implications for
coral reefs impacted by ocean acidification, Environ. Res. Lett., 7, 2,
https://doi.org/10.1088/1748-9326/7/2/024026, 2012.
Upstill-Goddard, R. C.: Air–sea gas exchange in the coastal zone, Estuar.
Coast. Shelf Sci., 70, 388–404, https://doi.org/10.1016/j.ecss.2006.05.043, 2006.
Van Dam, B.: Florida Bay Diel, figshare, https://doi.org/10.6084/m9.figshare.7707029, 2019.
Wanless, H. R. and Tagett, M. G.: Origin , Growth and Evolution of
Carbonate Mudbanks in Florida Bay, Bull. Mar. Sci., 44, 454–489, 1989.
Wanninkhof, R. H.: Relationship Between Wind Speed and Gas Exchange, J.
Geophys. Res., 97, 7373–7382, https://doi.org/10.1029/92JC00188, 1992.
Weiss, R. F.: Solubility of nitrogen, oxygen, and argon in water and
seawater, Deep-Sea Res., 17, 721–735, 1970.
Weiss, R. F.: Carbon Dioxide in Water and Seawater: The Solubility of a
Non-ideal Gas, Mar. Chem., 2, 203–215, 1974.
Welsh, D., Castadelli, G., Bartoli, M., Poli, D., Careri, M., De Wit, R., and Viaroli, P.: Denitrification in an intertidal seagrass meadow, a comparison of 15N-isotope and acetylene-block techniques: Dissimilatory nitrate reduction to ammonia as a source of N2O?, Mar. Biol., 139, 1029–1036, https://doi.org/10.1007/s002270100672, 2001.
Yamamoto, S., Kayanne, H., Tokoro, T., Kuwae, T., and Watanabe, A.: Total
alkalinity flux in coral reefs estimated from eddy covariance and sediment
pore-water profiles, Limnol. Oceanogr., 60, 229–241,
https://doi.org/10.1002/lno.10018, 2015.
Yates, K. K. and Halley, R. B.: Diurnal variation in rates of calcification
and carbonate sediment dissolution in Florida Bay, Estuar. Coasts,
29, 24–39, https://doi.org/10.1007/BF02784696, 2006.
Yates, K. K., Dufore, C., Smiley, N., Jackson, C., and Halley, R. B.:
Diurnal variation of oxygen and carbonate system parameters in Tampa Bay and
Florida Bay, Mar. Chem., 104, 110–124,
https://doi.org/10.1016/j.marchem.2006.12.008, 2007.
Zhang, J.-Z. and Fischer, C. J.: Carbon Dynamics of Florida Bay:
Spatiotemporal Patterns and Biological Control, Environ. Sci. Technol.,
48, 9161–9169, https://doi.org/10.1021/es500510z, 2014.
Ziegler, S. and Benner, R.: Ecosystem metabolism in a subtropical, seagrass-dominated lagoon, Mar. Ecol. Prog. Ser., 173, 1–12, https://doi.org/10.3354/meps173001, 1998.
Zieman, J. C., Fourqurean, J. W., and Iverson, R. L.: Distribution,
Abundance and Productivity of Seagrasses and Macroalgae in Florida Bay,
Bull. Mar. Sci., 44, 292–311, 1989.
Zimmerman, R. C., Hill, V. J., and Gallegos, C. L.: Predicting effects of
ocean warming, acidification, and water quality on Chesapeake region
eelgrass, Limnol. Oceanogr., 60, 1781–1804, https://doi.org/10.1002/lno.10139, 2015.
Short summary
We report on direct measurements of net ecosystem productivity (NEP) and net ecosystem calcification (NEC) in a Florida Bay seagrass ecosystem. We found notable differences between our carbon-based NEP and similar determinations made using oxygen. Over the study period, both NEP and NEC were negative, revealing that these sites are net heterotrophic and have dissolved CaCO3. Our findings point to sediments maintaining negative NEP and NEC despite high seagrass above-ground primary production.
We report on direct measurements of net ecosystem productivity (NEP) and net ecosystem...
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