Articles | Volume 18, issue 24
https://doi.org/10.5194/bg-18-6423-2021
© Author(s) 2021. 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-18-6423-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
15 Dec 2021
Research article |
| 15 Dec 2021
| 15 Dec 2021
Biophysical controls on seasonal changes in the structure, growth, and grazing of the size-fractionated phytoplankton community in the northern South China Sea
Yuan Dong
State key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China
Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, China
State key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China
Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, China
College of Marine Science, University of the Chinese Academy of Sciences, Beijing, China
Zhengchao Wu
State key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China
Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, China
Yiping Shuai
State key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China
College of Marine Science, University of the Chinese Academy of Sciences, Beijing, China
Zijia Liu
State key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China
College of Marine Science, University of the Chinese Academy of Sciences, Beijing, China
Zaiming Ge
State key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China
College of Marine Science, University of the Chinese Academy of Sciences, Beijing, China
Weiwen Zhou
State key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China
College of Marine Science, University of the Chinese Academy of Sciences, Beijing, China
Yinchao Chen
State key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China
College of Marine Science, University of the Chinese Academy of Sciences, Beijing, China
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Haibin Ye, Chaoyu Yang, Yuan Dong, Shilin Tang, and Chuqun Chen
Earth Syst. Sci. Data Discuss., https://doi.org/10.5194/essd-2024-6, https://doi.org/10.5194/essd-2024-6, 2024
Preprint under review for ESSD
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A deep learning model for gap filling based on the expected variance was developed;OI-SwinUnet achieves a good performance in reconstructing the chlorophyll-a concentration data in the South China Sea;the reconstructed dataset depicts well in both the spatiotemporal patterns at seasonal-scale & fast-change process at weather-scale;the reconstructed data can show chlorophyll perturbations of individual eddy at different life stages, giving academics a unique & complete perspective on eddy study.
Q. P. Li, Y. Dong, and Y. Wang
Biogeosciences, 13, 455–466, https://doi.org/10.5194/bg-13-455-2016, https://doi.org/10.5194/bg-13-455-2016, 2016
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Phytoplankton patchiness in the northeastern SCS during May 2014 could be largely controlled by vertical nutrient fluxes including turbulent diffusion and curl-driven upwelling. There was an increasing turbulent diffusion but decreasing curl-driven upwelling from the coastal upwelling zones to the offshore pelagic zones. Elevated fluxes near Dongsha led to net growth of a diatom-rich community, whereas low fluxes near southwest Taiwan resulted in a decline of a picoplankton bloom.
Haibin Ye, Chaoyu Yang, Yuan Dong, Shilin Tang, and Chuqun Chen
Earth Syst. Sci. Data Discuss., https://doi.org/10.5194/essd-2024-6, https://doi.org/10.5194/essd-2024-6, 2024
Preprint under review for ESSD
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A deep learning model for gap filling based on the expected variance was developed;OI-SwinUnet achieves a good performance in reconstructing the chlorophyll-a concentration data in the South China Sea;the reconstructed dataset depicts well in both the spatiotemporal patterns at seasonal-scale & fast-change process at weather-scale;the reconstructed data can show chlorophyll perturbations of individual eddy at different life stages, giving academics a unique & complete perspective on eddy study.
Zhengchao Wu, Qian P. Li, Zaiming Ge, Bangqin Huang, and Chunming Dong
Biogeosciences, 18, 1049–1065, https://doi.org/10.5194/bg-18-1049-2021, https://doi.org/10.5194/bg-18-1049-2021, 2021
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Seasonal hypoxia in the nearshore bottom waters frequently occurs in the Pearl River estuary. Aerobic respiration is the ultimate cause of local hypoxia. We found an elevated level of polyunsaturated aldehydes in the bottom water outside the estuary, which promoted the growth and metabolism of special groups of particle-attached bacteria and thus contributed to oxygen depletion in hypoxic waters. Our results may be important for understanding coastal hypoxia and its linkages to eutrophication.
Qian P. Li, Weiwen Zhou, Yinchao Chen, and Zhengchao Wu
Biogeosciences, 15, 2551–2563, https://doi.org/10.5194/bg-15-2551-2018, https://doi.org/10.5194/bg-15-2551-2018, 2018
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Variabilities of phytoplankton physiology and size-fractionated growth could be related to the physical dynamics of a frontal system. While the river plume increased growths of three phytoplankton size classes, both nano- and picocells became saturated at the frontal zone. Vertical mixing/upwelling improved phytoplankton growth on both sides of the front by altering nutrient concentrations and ratios. These are important for understanding physically driven ecosystem dynamics in the shelf sea.
Q. P. Li, Y. Dong, and Y. Wang
Biogeosciences, 13, 455–466, https://doi.org/10.5194/bg-13-455-2016, https://doi.org/10.5194/bg-13-455-2016, 2016
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Phytoplankton patchiness in the northeastern SCS during May 2014 could be largely controlled by vertical nutrient fluxes including turbulent diffusion and curl-driven upwelling. There was an increasing turbulent diffusion but decreasing curl-driven upwelling from the coastal upwelling zones to the offshore pelagic zones. Elevated fluxes near Dongsha led to net growth of a diatom-rich community, whereas low fluxes near southwest Taiwan resulted in a decline of a picoplankton bloom.
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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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Claudine Hauri, Brita Irving, Sam Dupont, Rémi Pagés, Donna D. W. Hauser, and Seth L. Danielson
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William Hiles, Lucy C. Miller, Craig Smeaton, and William E. N. Austin
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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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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.
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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.
David González-Santana, María Segovia, Melchor González-Dávila, Librada Ramírez, Aridane G. González, Leonardo J. Pozzo, Veronica Arnone, Victor Vázquez, Ulf Riebesell, and J. Magdalena Santana-Casiano
EGUsphere, https://doi.org/10.5194/egusphere-2023-2868, https://doi.org/10.5194/egusphere-2023-2868, 2023
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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.
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.
Sandy E. Tenorio and Laura Farías
Biogeosciences Discuss., https://doi.org/10.5194/bg-2023-185, https://doi.org/10.5194/bg-2023-185, 2023
Revised manuscript accepted for BG
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Time series studies show that CH4 is highly dynamic on the coastal ocean surface and that planktonic communities are linked to CH4 accumulation as is found in coastal upwelling off Central Chile. We’ve identified the crucial role of picoplankton (>3μm) in CH4 recycling, especially with the addition of methylated substrates (TMA and MPn) during upwelling and non-upwelling periods. These insights improve understanding of surface ocean CH4 recycling, aiding accurate CH4 emissions estimates.
Jiaying A. Guo, Robert F. Strzepek, Kerrie M. Swadling, Ashley T. Townsend, and Lennart T. Bach
EGUsphere, https://doi.org/10.5194/egusphere-2023-2120, https://doi.org/10.5194/egusphere-2023-2120, 2023
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Ocean alkalinity enhancement (OAE) aims to increase atmospheric CO2 sequestration in the oceans by spreading ground alkaline materials into the ocean. To assess the environmental impacts of OAE, we used 53 L microcosms to test how coastal plankton communities respond to OAE with olivine or steel slag as alkalinity sources. Overall, steel slag is much more efficient for CO2 removal than olivine and appears to be induce less changes in the phytoplankton and zooplankton communities.
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.
Sabine Schmidt and Ibrahima I. Diallo
Biogeosciences Discuss., https://doi.org/10.5194/bg-2023-150, https://doi.org/10.5194/bg-2023-150, 2023
Revised manuscript accepted for BG
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Along the French coast facing the Bay of Biscay, the two main estuaries, the Gironde and the Loire, experience hypoxia, motivating this study of the small Charente estuary between them. This work highlights a minimum oxygen zone in the Charente estuary extending for about 25 km, temperature being the main factor controlling the hypoxia. This calls for the monitoring of small highly turbid macrotidal estuaries vulnerable to hypoxia, a risk that will increase with global warming.
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.
Charlotte Williams, Tom Hull, Matthew Palmer, Claire Mahaffey, Naomi Greenwood, Jan Kaiser, and Matthew Toberman
Biogeosciences Discuss., https://doi.org/10.5194/bg-2023-100, https://doi.org/10.5194/bg-2023-100, 2023
Revised manuscript accepted for BG
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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 reach ecologically low levels.
Giovanni Galli, Sarah Wakelin, James Harle, Jason Holt, and Yuri Artioli
EGUsphere, https://doi.org/10.5194/egusphere-2023-1049, https://doi.org/10.5194/egusphere-2023-1049, 2023
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In this work we looked at the projected change in bottom water oxygen content in an ensemble of ocean climate change models of the North Western European Shelf. What emerged is that, 1. oxygen decreases in all models, 2. in the models with the most warming, a change in circulation patterns is tied to the emergence of low oxygen hotspots in the Eastern North Sea, and, 3. in relatively shallow coastal areas increasing in primary production partially mitigates oxygen decline.
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.
Coline Poppeschi, Guillaume Charria, Anne Daniel, Romaric Verney, Peggy Rimmelin-Maury, Michaël Retho, Eric Goberville, Emilie Grossteffan, and Martin Plus
Biogeosciences, 19, 5667–5687, https://doi.org/10.5194/bg-19-5667-2022, https://doi.org/10.5194/bg-19-5667-2022, 2022
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This paper aims to understand interannual changes in the initiation of the phytoplankton growing period (IPGP) in the current context of global climate changes over the last 20 years. An important variability in the timing of the IPGP is observed with a trend towards a later IPGP during this last decade. The role and the impact of extreme events (cold spells, floods, and wind burst) on the IPGP is also detailed.
Lin Yang, Jing Zhang, Anja Engel, and Gui-Peng Yang
Biogeosciences, 19, 5251–5268, https://doi.org/10.5194/bg-19-5251-2022, https://doi.org/10.5194/bg-19-5251-2022, 2022
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Enrichment factors of dissolved organic matter (DOM) in the eastern marginal seas of China exhibited a significant spatio-temporal variation. Photochemical and enrichment processes co-regulated DOM enrichment in the sea-surface microlayer (SML). Autochthonous DOM was more frequently enriched in the SML than terrestrial DOM. DOM in the sub-surface water exhibited higher aromaticity than that in the SML.
Mona Norbisrath, Johannes Pätsch, Kirstin Dähnke, Tina Sanders, Gesa Schulz, Justus E. E. van Beusekom, and Helmuth Thomas
Biogeosciences, 19, 5151–5165, https://doi.org/10.5194/bg-19-5151-2022, https://doi.org/10.5194/bg-19-5151-2022, 2022
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Total alkalinity (TA) regulates the oceanic storage capacity of atmospheric CO2. TA is also metabolically generated in estuaries and influences coastal carbon storage through its inflows. We used water samples and identified the Hamburg port area as the one with highest TA generation. Of the overall riverine TA load, 14 % is generated within the estuary. Using a biogeochemical model, we estimated potential effects on the coastal carbon storage under possible anthropogenic and climate changes.
Le Zhang and Z. George Xue
Biogeosciences, 19, 4589–4618, https://doi.org/10.5194/bg-19-4589-2022, https://doi.org/10.5194/bg-19-4589-2022, 2022
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We adopt a high-resolution carbon model for the Gulf of Mexico (GoM) and calculate the decadal trends of important carbon system variables in the GoM from 2001 to 2019. The GoM surface CO2 values experienced a steady increase over the past 2 decades, and the ocean surface pH is declining. Although carbonate saturation rates remain supersaturated with aragonite, they show a slightly decreasing trend. The northern GoM is a stronger carbon sink than we thought.
Michael M. Whitney
Biogeosciences, 19, 4479–4497, https://doi.org/10.5194/bg-19-4479-2022, https://doi.org/10.5194/bg-19-4479-2022, 2022
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Coastal hypoxia is a major environmental problem of increasing severity. The 21st-century projections analyzed indicate global coastal waters will warm and experience rapid declines in oxygen. The forecasted median coastal trends for increasing sea surface temperature and decreasing oxygen capacity are 48 % and 18 % faster than the rates observed over the last 4 decades. Existing hypoxic areas are expected to worsen, and new hypoxic areas likely will emerge under these warming-related pressures.
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.
Jiaying Abby Guo, Robert Strzepek, Anusuya Willis, Aaron Ferderer, and Lennart Thomas Bach
Biogeosciences, 19, 3683–3697, https://doi.org/10.5194/bg-19-3683-2022, https://doi.org/10.5194/bg-19-3683-2022, 2022
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Ocean alkalinity enhancement is a CO2 removal method with significant potential, but it can lead to a perturbation of the ocean with trace metals such as nickel. This study tested the effect of increasing nickel concentrations on phytoplankton growth and photosynthesis. We found that the response to nickel varied across the 11 phytoplankton species tested here, but the majority were rather insensitive. We note, however, that responses may be different under other experimental conditions.
Malcolm E. Scully, W. Rockwell Geyer, David Borkman, Tracy L. Pugh, Amy Costa, and Owen C. Nichols
Biogeosciences, 19, 3523–3536, https://doi.org/10.5194/bg-19-3523-2022, https://doi.org/10.5194/bg-19-3523-2022, 2022
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For two consecutive summers, the bottom waters in southern Cape Cod Bay became severely depleted of dissolved oxygen. Low oxygen levels in bottom waters have never been reported in this area before, and this unprecedented occurrence is likely the result of a new algae species that recently began blooming during the late-summer months. We present data suggesting that blooms of this new species are the result of regional climate change including warmer waters and changes in summer winds.
Zheng Chen, Bin Wang, Chuang Xu, Zhongren Zhang, Shiyu Li, and Jiatang Hu
Biogeosciences, 19, 3469–3490, https://doi.org/10.5194/bg-19-3469-2022, https://doi.org/10.5194/bg-19-3469-2022, 2022
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Deterioration of low-oxygen conditions in the coastal waters off Hong Kong was revealed by monitoring data over two decades. The declining wind forcing and the increasing nutrient input contributed significantly to the areal expansion and intense deterioration of low-oxygen conditions. Also, the exacerbated eutrophication drove a shift in the dominant source of organic matter from terrestrial inputs to in situ primary production, which has probably led to an earlier onset of hypoxia in summer.
Stella-Theresa Stoicescu, Jaan Laanemets, Taavi Liblik, Māris Skudra, Oliver Samlas, Inga Lips, and Urmas Lips
Biogeosciences, 19, 2903–2920, https://doi.org/10.5194/bg-19-2903-2022, https://doi.org/10.5194/bg-19-2903-2022, 2022
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Coastal basins with high input of nutrients often suffer from oxygen deficiency. In summer 2018, the extent of oxygen depletion was exceptional in the Gulf of Riga. We analyzed observational data and found that extensive oxygen deficiency appeared since the water layer close to the seabed, where oxygen is consumed, was separated from the surface layer. The problem worsens if similar conditions restricting vertical transport of oxygen occur more frequently in the future.
Justin C. Tiano, Jochen Depestele, Gert Van Hoey, João Fernandes, Pieter van Rijswijk, and Karline Soetaert
Biogeosciences, 19, 2583–2598, https://doi.org/10.5194/bg-19-2583-2022, https://doi.org/10.5194/bg-19-2583-2022, 2022
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This study gives an assessment of bottom trawling on physical, chemical, and biological characteristics in a location known for its strong currents and variable habitats. Although trawl gears only removed the top 1 cm of the seabed surface, impacts on reef-building tubeworms significantly decreased carbon and nutrient cycling. Lighter trawls slightly reduced the impact on fauna and nutrients. Tubeworms were strongly linked to biogeochemical and faunal aspects before but not after trawling.
Inda Brinkmann, Christine Barras, Tom Jilbert, Tomas Næraa, K. Mareike Paul, Magali Schweizer, and Helena L. Filipsson
Biogeosciences, 19, 2523–2535, https://doi.org/10.5194/bg-19-2523-2022, https://doi.org/10.5194/bg-19-2523-2022, 2022
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The concentration of the trace metal barium (Ba) in coastal seawater is a function of continental input, such as riverine discharge. Our geochemical records of the severely hot and dry year 2018, and following wet year 2019, reveal that prolonged drought imprints with exceptionally low Ba concentrations in benthic foraminiferal calcium carbonates of coastal sediments. This highlights the potential of benthic Ba / Ca to trace past climate extremes and variability in coastal marine records.
Shichao Tian, Birgit Gaye, Jianhui Tang, Yongming Luo, Wenguo Li, Niko Lahajnar, Kirstin Dähnke, Tina Sanders, Tianqi Xiong, Weidong Zhai, and Kay-Christian Emeis
Biogeosciences, 19, 2397–2415, https://doi.org/10.5194/bg-19-2397-2022, https://doi.org/10.5194/bg-19-2397-2022, 2022
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We constrain the nitrogen budget and in particular the internal sources and sinks of nitrate in the Bohai Sea by using a mass-based and dual stable isotope approach based on δ15N and δ18O of nitrate. Based on available mass fluxes and isotope data an updated nitrogen budget is proposed. Compared to previous estimates, it is more complete and includes the impact of the interior cycle (nitrification) on the nitrate pool. The main external nitrogen sources are rivers contributing 19.2 %–25.6 %.
Cited articles
Anderson, S. R. and Harvey, E. L.:
Seasonal variability and drivers of microzooplankton grazing and phytoplankton growth in a subtropical estuary,
Front. Mar. Sci.,
6, 174, https://doi.org/10.3389/fmars.2019.00174, 2019.
Bergkvist, J., Thor, P., Jakobsen, H. H., Wängberg, S., and Selander, E.:
Grazer-induced chain length plasticity reduces grazing risk in a marine diatom,
Limnol. Oceanogr.,
57, 318–324, https://doi.org/10.4319/lo.2012.57.1.0318, 2012.
Bernard, C. and Rassoulzadegan, F.:
Bacteria or microflagellates as a major food source for marine ciliates: possible implications for the microzooplankton,
Mar. Ecol. Prog. Ser.,
64, 147–155, https://doi.org/10.3354/meps064147, 1990.
Calbet, A.:
Mesozooplankton grazing effect on primary production: A global comparative analysis in marine ecosystems,
Limnol. Oceanogr.,
7, https://doi.org/10.4319/lo.2001.46.7.1824, 2001.
Calbet, A. and Landry, M. R.:
Mesozooplankton influences on the microbial food web: Direct and indirect trophic interactions in the oligotrophic open ocean,
Limnol. Oceanogr.,
6, https://doi.org/10.4319/lo.1999.44.6.1370, 1999.
Calbet, A. and Landry, M. R.:
Phytoplankton growth, microzooplankton grazing, and carbon cycling in marine systems,
Limnol. Oceanogr.,
49, 51–57, https://doi.org/10.4319/lo.2004.49.1.0051, 2004.
Calbet, A. and Saiz, E.:
Effects of trophic cascades in dilution grazing experiments: from artificial saturated feeding responses to positive slopes,
J. Plankton Res.,
35, 1183–1191, https://doi.org/10.1093/plankt/fbt067, 2013.
Chen, B. Z., Liu, H. B., Landry, M. R., Chen, M. R., Sun, J., Shek, L., Chen, X., and Harrison. P. J.:
Estuarine nutrient loading affects phytoplankton growth and microzooplankton grazing at two contrasting sites in Hong Kong coastal waters,
Mar. Ecol. Prog. Ser.,
379, 77–90, https://doi.org/10.3354/meps07888, 2009.
Chen, B. Z, Laws, E. A., Liu, H. B., and Huang, B. Q.:
Estimating microzooplankton grazing half-saturation constants from dilution experiments with nonlinear feeding kinetics,
Limnol. Oceanogr.,
59, 639–644, https://doi.org/10.4319/lo.2014.59.3.0639, 2014.
Chen, M. R., Liu, H. B, Song, S. Q., and Sun, J.:
Size-fractionated mesozooplankton biomass and grazing impact on phytoplankton in northern South China Sea during four seasons,
Deep-Sea Res. Pt. II,
117, 108–118, https://doi.org/10.1016/j.dsr2.2015.02.026, 2015.
Christaki, U., Giannakourou, A., Wambeke, F. V., and Grégori, G.:
Nanoflagellate predation on auto-and heterotrophic picoplankton in the oligotrophic Mediterranean Sea,
J. Plankton Res.,
23, 1297–1310, https://doi.org/10.1093/plankt/23.11.1297, 2001.
Cloern, J. E., Foster, S. Q., and Kleckner, A. E.: Phytoplankton primary production in the world's estuarine-coastal ecosystems, Biogeosciences, 11, 2477–2501, https://doi.org/10.5194/bg-11-2477-2014, 2014.
Dong, Y., Li, Q. P., Liu, Z. J., Wu, Z. C., and Zhou, W. W.:
Size-dependent phytoplankton growth and grazing in the northern South China Sea,
Mar. Ecol. Prog. Ser.,
599, 35–47, https://doi.org/10.3354/meps12614, 2018.
Eppley, R. W.:
Temperature and phytoplankton growth in the sea,
Fish. B.-NOAA,
70, 1063–1086, 1972.
Froneman, P. and Perissinotto, R.:
Microzooplankton grazing in the Southern Ocean: implications for the carbon cycle,
Mar. Ecol.,
17, 99–115, https://doi.org/10.1111/j.1439-0485.1996.tb00493.x, 1996.
Gan, J. P., Lu, Z. M., Dai, M. H., Cheung, A. Y. Y., Liu, H. B., and Harrison, P.:
Biological response to intensified upwelling and to a river plume in the northeastern South China Sea: A modeling study,
J. Geophys. Res.,
115, C09001, https://doi.org/10.1029/2009JC005569, 2010.
Garrison, D. L., Gowing, M. M., Hughes, M. P., Campbell L., Caron D. A., Dennett, M. R., Shalapyonok, A., Olson, R. J., Landry, M. R., Brown, S. L., Liu, H. B., Azam, F., Steward, G. F., Ducklow, H. W., and Smith, D. C.:
Microbial food web structure in the Arabian Sea: a US JGOFS study,
Deep-Sea Res. Pt. II,
47, 1387–1422, https://doi.org/10.1016/S0967-0645(99)00148-4, 2000.
Girault, M., Arakawa, H., and Hashihama, F.:
Phosphorus stress of microphytoplankton community in the western subtropical North Pacific,
J. Plankton Res.,
35, 146–157, https://doi.org/10.1093/plankt/fbs076, 2013.
Guillard, R. R. L. and Kilham, P.:
The ecology of marine plankton diatoms,
in: The Biology of Diatoms,
editd by: Werner, D.,
University California Press, Berkeley, 372–469, 1977.
Hansen, H. P. and Koroleff, F.:
Determination of dissolved inorganic phosphate,
in: Methods of seawater analysis,
edited by: Grasshoff, K., Kremling, K., and Ehrhardt, M.,
John Wiley and Sons, 159–228, https://doi.org/10.1002/9783527613984.ch10, 1999.
Haraguchi, L., Jakobse, H. H., Lundholm, N., and Carstensen, J.:
Phytoplankton community dynamic: a driver for ciliate trophic strategies,
Front. Mar. Sci.,
5, 272, https://doi.org/10.3389/fmars.2018.00272, 2018.
Holling, C. S.:
Some characteristics of simple types of predation and parasitism,
Can. Entomol.,
91, 385–398, 1959.
Ichinotsuka, D., Ueno, H., and Nakano, S.:
Relative importance of nanoflagellates and ciliates as consumers of bacteria in a coastal sea area dominated by oligotrichous Strombidium and Strobilidium,
Aquat. Microb. Ecol.,
42, 139–147, https://doi.org/10.3354/ame042139, 2006.
Jolliff, J. K., Smith, T. A., Barron, C. N., deRada, S., Anderson, S. C., Gould, R. W., and Arnone, R.:
The impact of coastal phytoplankton blooms on ocean-atmosphere thermal energy exchange: Evidence from a two-way coupled numerical modeling system, Geophys. Res. Lett., 39, L24607, https://doi.org/10.1029/2012GL053634, 2012.
Karu, F., Kobari, T., Honma, T., Kanayama, T., Suzuki, K., Yoshie, N., and Kume, G.:
Trophic sources and linkages to support mesozooplankton community in the Kuroshio of the East China Sea,
Fish. Oceanogr.,
29, 442–456, https://doi.org/10.1111/fog.12488, 2020.
Landry, M. R. and Hassett, R. P.:
Estimating the grazing impact of marine micro-zooplankton,
Mar. Biol.,
67, 283–288, https://doi.org/10.1007/bf00397668, 1982.
Landry, M. R., Monger, B. C., and Selph, K. E.:
Time-dependency of microzooplankton grazing and phytoplankton growth in the subarctic Pacific,
Prog. Oceanogr.,
32, 205–222, https://doi.org/10.1016/0079-6611(93)90014-5, 1993.
Landry, M. R., Ohman, M. D., Goericke, R., Stukel, M. R., and Tsyrklevich, K.:
Lagrangian studies of phytoplankton growth and grazing relationships in a coastal upwelling ecosystem off Southern California,
Prog. Oceanogr.,
83, 208–216, https://doi.org/10.1016/j.pocean.2009.07.026, 2009.
Li, J., Plouchart, D., Zastepa, A., and Dittrich, M.:
Picoplankton accumulate and recycle polyphosphate to support high primary productivity in coastal Lake Ontario,
Sci. Rep.,
9, 19563, https://doi.org/10.1038/s41598-019-56042-5, 2019.
Li, L., Lv, S. H., Jiang, T., and Li. X.:
Seasonal variation of size-fractionated phytoplankton in the Pearl River estuary, Chinese Sci. Bull., 58, 2303–2314, https://doi.org/10.1007/s11434-013-5823-1, 2013.
Li, Q. P.: Monthly grazing rates of microzooplankton outside Pearl River estuary, available at: http://data.scsio.ac.cn/metaData-detail/1405396650095489024 [data set], last access: 14 December 2021.
Li, Q. P., Franks, P. J. S. Landry M. R., Goericke R., and Taylor, A. G.:
Modeling phytoplankton growth rates and chlorophyll to carbon ratios in California coastal and pelagic ecosystems,
J. Geophys. Res.,
115, G04003, https://doi.org/10.1029/2009JG001111, 2010.
Li, Q. P., Franks, P. J. S., and Landry, M. R.:
Microzooplankton grazing dynamics: parameterizing grazing models with dilution experiment data in the Southern California Ecosystem,
Mar. Ecol. Prog. Ser.,
438, 59–69, https://doi.org/10.3354/meps09320, 2011.
Li, Q. P., Franks, P. J. S., Ohman, M. D., and Landry, M. R.:
Enhanced nitrate fluxes and biological processes at a frontal zone in the southern California current system,
J. Plankton Res.,
34, 790–801, https://doi.org/10.1093/plankt/fbs006, 2012.
Li, Q. P., Zhou, W., Chen, Y., and Wu, Z.: Phytoplankton response to a plume front in the northern South China Sea, Biogeosciences, 15, 2551–2563, https://doi.org/10.5194/bg-15-2551-2018, 2018.
Lie, A. A. Y. and Wong, C. K.:
Selectivity and grazing impact of microzooplankton on phytoplankton in two subtropical semi-enclosed bays with different chlorophyll concentrations,
J. Exp. Mar. Biol. Ecol.,
390, 149–159, https://doi.org/10.1016/j.jembe.2010.05.001, 2010.
Liu, H., Chen, M., Suzuki, K., Wong, C. K., and Chen, B.:
Mesozooplankton selective feeding in subtropical coastal waters as revealed by HPLC pigment analysis,
Mar. Ecol. Prog. Ser.,
407, 111–123, https://doi.org/10.3354/meps08550, 2010.
Menden-Deuer, S., Lawrence, C., and Franzè, G.:
Herbivorous protist growth and grazing rates at in situ and artificially elevated temperatures during an Arctic phytoplankton spring bloom,
PeerJ,
6, e5264, https://doi.org/10.7717/peerj.5264, 2018.
Parsons, T. R, Maita, Y., and Lalli, C. M.:
A Manual of Chemical and Biological Methods for Seawater Analysis,
Elsevier, New York, 1984.
Poulin, F. J. and Franks, P. J. S.:
Size-structured planktonic ecosystems: constraints, controls and assembly instructions,
J. Plankton Res.,
32, 1121–1130, https://doi.org/10.1093/plankt/fbp145, 2010.
Putt, M. and Stoecker, D. K.:
An experimentally determined carbon:volume ration for marine “oligotrichous” ciliates from estuarine and coastal waters,
Limnol. Oceanogr.,
34, 1097–1103, 1989.
Rose, J. M. and Caron, D. A.:
Does low temperature constrain the growth rates of heterotrophic protists? Evidence and implications for algal blooms in cold waters,
Limnol. Oceanogr.,
52, 886–895. https://doi.org/10.4319/lo.2007.52.2.0886, 2007.
Sailley, S. F., Polimene, L., Mitra, A., Atkinson, A., and Allen, J. I.:
Impact of zooplankton food selectivity on plankton dynamics and nutrient cycling,
J. Plankton Res.,
37, 519–529, https://doi.org/10.1093/plankt/fbv020, 2915.
Schmoker, C., Hernandez-Leon, S., and Calbet, A.:
Microzooplankton grazing in the oceans: impacts, data variability, knowledge gaps and future directions,
J. Plankton Res.,
35, 691–706, https://doi.org/10.1093/plankt/fbt023, 2013.
Shuai, Y., Li, Q. P., and Wu, Z.: Biogeochemical responses to nutrient fluxes in the open South China Sea: a 3-D modeling study, J. Geophys. Res., 126, e2020JC016895, https://doi.org/10.1029/2020JC016895, 2021.
Steinberg, D. K. and Landry, M. R.:
Zooplankton and the ocean carbon cycle,
Annu. Rev. Mar. Sci.,
9, 413–444, https://doi.org/10.1146/annurev-marine-010814-015924, 2017.
Strom, S. L., Macri, E. L., and Olson, M. B.:
Microzooplankton grazing in the coastal Gulf of Alaska: Variations in top-down control of phytoplankton,
Limnol. Oceanogr.,
52, 1480–94, https://doi.org/10.4319/lo.2007.52.4.1480, 2007.
Unrein, F., Massana, R., Alonso-Sáez, L., and Gasol, J. M.:
Significant year-round effect of small mixotrophic flagellates on bacterioplankton in an oligotrophic coastal system,
Limnol. Oceanogr.,
52, 456–469, https://doi.org/10.4319/lo.2007.52.1.0456, 2007.
Utermöhl, H.:
Zur vervolkomnung der quantitative Phytoplankton-Methodik,
Int. Ver. The.,
9, 1–38, https://doi.org/10.1080/05384680.1958.11904091, 1958.
van de Poll, W. H., Maat, D. S., Fischer, P., Visser, R. J. W., Brussaard, C. P. D., and Buma, A. G. J.:
Solar radiation and solar radiation driven cycles in warming and freshwater discharge control seasonal and inter-annual phytoplankton chlorophyll a and taxonomic composition in a high Arctic fjord (Kongsfjorden, Spitsbergen),
Limnol. Oceanogr.,
66, 1221–1236, https://doi.org/10.1002/lno.11677, 2021.
Vargas, C. A. and Martínez, R. A.:
Grazing impact of natural populations of ciliates and dinoflagellates in a river-influenced continental shelf,
Aquat. Microb. Ecol.,
56, 93-108, https://doi.org/10.3354/ame01319, 2009.
Verity, P. G. and Langdon, C.:
Relationships between lorica volume, carbon, nitrogen and ATP content of tintinnids in Narragansett Bay,
J. Plankton Res.,
6, 859–868, 1984.
Wang, W. C., Sun, S., Sun, X., Zhang, G. T., and Zhang, F.:
Spatial patterns of zooplankton size structure in relation to environmental factors in Jiaozhou Bay, South Yellow Sea,
Mar. Pollut. Bull.,
150, 110698, https://doi.org/10.1016/j.marpolbul.2019.110698, 2020.
Worden, A. Z., Nolan, J. K., and Palenik B.:
Assessing the dynamics and ecology of marine picophytoplankton : The importance of the eukaryotic component,
Limnol. Oceanogr.,
49, 168–179, https://doi.org/10.4319/lo.2004.49.1.0168, 2004.
Wu, Z. C. and Li, Q. P.:
Spatial distributions of polyunsaturated aldehydes and their biogeochemical implications in the Pearl River Estuary and the adjacent northern South China Sea,
Prog. Oceanogr.,
147, 1–9, https://doi.org/10.1016/j.pocean.2016.07.010, 2016.
Zhou, W. W., Li, Q. P., and Wu, Z. C.:
Coastal phytoplankton responses to atmospheric deposition during summer,
Limnol. Oceanogr.,
66, 1298–1315, https://doi.org/10.1002/lno.11683, 2021.
Short summary
Temporal change of plankton growth and grazing are less known in the coastal ocean, not to mention the relevant controlling mechanisms. Here, we performed monthly size-specific dilution experiments outside a eutrophic estuary over a 1-year cycle. Phytoplankton growth was correlated to nutrients and grazing mortality to total chlorophyll a. A selective grazing on small cells may be important for maintaining high abundance of large-chain-forming diatoms in this eutrophic system.
Temporal change of plankton growth and grazing are less known in the coastal ocean, not to...
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