Articles | Volume 18, issue 4
https://doi.org/10.5194/bg-18-1321-2021
© 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-18-1321-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
22 Feb 2021
Research article |
| 22 Feb 2021
| 22 Feb 2021
Changes in population depth distribution and oxygen stratification are involved in the current low condition of the eastern Baltic Sea cod (Gadus morhua)
Department of Aquatic
Resources, Institute of Marine Research, Swedish University of Agricultural Sciences, Lysekil, Sweden
Department of Biological, Geological and
Environmental Sciences, University of Bologna, Bologna, Italy
Martin Hansson
Oceanographic Unit, Department of Data and Information, Swedish Meteorological and Hydrological Institute, Gothenburg, Sweden
Alessandro Orio
Department of Aquatic
Resources, Institute of Marine Research, Swedish University of Agricultural Sciences, Lysekil, Sweden
Karin Limburg
Department of Aquatic
Resources, Institute of Marine Research, Swedish University of Agricultural Sciences, Lysekil, Sweden
Department of Environmental and Forest Biology, State University of New York College of Environmental Science and
Forestry, Syracuse, New
York, USA
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Earth Syst. Sci. Data Discuss., https://doi.org/10.5194/essd-2024-102, https://doi.org/10.5194/essd-2024-102, 2024
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We collated data from multiple fish stomach content databases to improve understanding of marine food web interactions for the North Atlantic and Arctic Oceans. These data were used to categorise fish into feeding guilds and applied to understand change in fish populations observed in scientific trawl surveys. This revealed spatially extensive temporal change in marine ecosystem structure and functioning. Our study provides evidence supporting a candidate food web indicator for the OSPAR Area.
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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 low-oxygen stress for marine animals including their use, research needs, and application to confront the challenges of ocean oxygen loss.
Murray S. A. Thompson, Izaskun Preciado, Federico Maioli, Valerio Bartolino, Andrea Belgrano, Michele Casini, Pierre Cresson, Elena Eriksen, Gema Hernandez-Milian, Ingibjörg G. Jónsdóttir, Stefan Neuenfeldt, John F. Pinnegar, Stefán Ragnarsson, Sabine Schueckel, Ulrike Schueckel, Brian E. Smith, María Á. Torres, Thomas J. Webb, and Christopher P. Lynam
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We collated data from multiple fish stomach content databases to improve understanding of marine food web interactions for the North Atlantic and Arctic Oceans. These data were used to categorise fish into feeding guilds and applied to understand change in fish populations observed in scientific trawl surveys. This revealed spatially extensive temporal change in marine ecosystem structure and functioning. Our study provides evidence supporting a candidate food web indicator for the OSPAR Area.
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We found a 3-to-5-fold decline in boron in Baltic cod otoliths between the late 1990s and 2021. The trend correlates with declines in oxygen and pH but not with increased salinity. Otolith B : Ca correlated with phosphorus in a healthy out-group (Icelandic cod) but not in Baltic cod. The otolith biomarkers Mn : Mg (hypoxia proxy) and B : Ca in cod otoliths suggest a general increase in both hypoxia and acidification within Baltic intermediate and deep waters in the last decade.
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Biogeosciences, 21, 3271–3288, https://doi.org/10.5194/bg-21-3271-2024, https://doi.org/10.5194/bg-21-3271-2024, 2024
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We report the first benthic foraminifera with a composite test (i.e. shell) made of opal, which coats the inner part of the calcitic layer. Using comprehensive techniques, we describe the morphology and the composition of this novel opal layer and provide evidence that the opal is precipitated by the foraminifera itself. We explore the potential precipitation process and function(s) of this composite test and further discuss the possible implications for palaeoceanographic reconstructions.
Said Mohamed Hashim, Beth Wangui Waweru, and Agnes Muthumbi
Biogeosciences, 21, 2995–3006, https://doi.org/10.5194/bg-21-2995-2024, https://doi.org/10.5194/bg-21-2995-2024, 2024
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The study investigates the impact of decreasing oxygen in the ocean on macrofaunal communities using the BUS as an example. It identifies distinct shifts in community composition and feeding guilds across oxygen zones, with nematodes dominating dysoxic areas. These findings underscore the complex responses of benthic organisms to oxygen gradients, crucial for understanding ecosystem dynamics in hypoxic environments and their implications for marine biodiversity and sustainability.
Tanguy Soulié, Francesca Vidussi, Justine Courboulès, Marie Heydon, Sébastien Mas, Florian Voron, Carolina Cantoni, Fabien Joux, and Behzad Mostajir
Biogeosciences, 21, 1887–1902, https://doi.org/10.5194/bg-21-1887-2024, https://doi.org/10.5194/bg-21-1887-2024, 2024
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Due to climate change, it is projected that extreme rainfall events, which bring terrestrial matter into coastal seas, will occur more frequently in the Mediterranean region. To test the effects of runoffs of terrestrial matter on plankton communities from Mediterranean coastal waters, an in situ mesocosm experiment was conducted. The simulated runoff affected key processes mediated by plankton, such as primary production and respiration, suggesting major consequences of such events.
Chueh-Chen Tung, Yu-Shih Lin, Jian-Xiang Liao, Tzu-Hsuan Tu, James T. Liu, Li-Hung Lin, Pei-Ling Wang, and Chih-Lin Wei
Biogeosciences, 21, 1729–1756, https://doi.org/10.5194/bg-21-1729-2024, https://doi.org/10.5194/bg-21-1729-2024, 2024
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This study contrasts seabed food webs between a river-fed, high-energy canyon and the nearby slope. We show higher organic carbon (OC) flows through the canyon than the slope. Bacteria dominated the canyon, while seabed fauna contributed more to the slope food web. Due to frequent perturbation, the canyon had a lower faunal stock and OC recycling. Only 4 % of the seabed OC flux enters the canyon food web, suggesting a significant role of the river-fed canyon in transporting OC to the deep sea.
Joost de Vries, Fanny Monteiro, Gerald Langer, Colin Brownlee, and Glen Wheeler
Biogeosciences, 21, 1707–1727, https://doi.org/10.5194/bg-21-1707-2024, https://doi.org/10.5194/bg-21-1707-2024, 2024
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Calcifying phytoplankton (coccolithophores) utilize a life cycle in which they can grow and divide into two different phases. These two phases (HET and HOL) vary in terms of their physiology and distributions, with many unknowns about what the key differences are. Using a combination of lab experiments and model simulations, we find that nutrient storage is a critical difference between the two phases and that this difference allows them to inhabit different nitrogen input regimes.
Theodor Kindeberg, Karl Michael Attard, Jana Hüller, Julia Müller, Cintia Organo Quintana, and Eduardo Infantes
Biogeosciences, 21, 1685–1705, https://doi.org/10.5194/bg-21-1685-2024, https://doi.org/10.5194/bg-21-1685-2024, 2024
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Seagrass meadows are hotspots for biodiversity and productivity, and planting seagrass is proposed as a tool for mitigating biodiversity loss and climate change. We assessed seagrass planted in different years and found that benthic oxygen and carbon fluxes increased as the seabed developed from bare sediments to a mature seagrass meadow. This increase was partly linked to the diversity of colonizing algae which increased the light-use efficiency of the seagrass meadow community.
Kristin Jones, Lenaïg Hemery, Nicholas Ward, Peter Regier, Mallory Ringham, and Matthew Eisaman
EGUsphere, https://doi.org/10.5194/egusphere-2024-972, https://doi.org/10.5194/egusphere-2024-972, 2024
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Ocean alkalinity enhancement is a marine carbon dioxide removal method that aims to mitigate the effects of climate change. This method causes localized increases in ocean pH, but the biological impacts of such changes are not well known. Our study investigated the response of two nearshore invertebrate species to increased pH and found the sea hare to be sensitive to pH changes, while the isopod was more resilient. Understanding interactions with biology is important as this field expands.
Anna-Selma van der Kaaden, Sandra R. Maier, Siluo Chen, Laurence H. De Clippele, Evert de Froe, Theo Gerkema, Johan van de Koppel, Furu Mienis, Christian Mohn, Max Rietkerk, Karline Soetaert, and Dick van Oevelen
Biogeosciences, 21, 973–992, https://doi.org/10.5194/bg-21-973-2024, https://doi.org/10.5194/bg-21-973-2024, 2024
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Combining hydrodynamic simulations and annotated videos, we separated which hydrodynamic variables that determine reef cover are engineered by cold-water corals and which are not. Around coral mounds, hydrodynamic zones seem to create a typical reef zonation, restricting corals from moving deeper (the expected response to climate warming). But non-engineered downward velocities in winter (e.g. deep winter mixing) seem more important for coral reef growth than coral engineering.
Xiaoke Xin, Giulia Faucher, and Ulf Riebesell
Biogeosciences, 21, 761–772, https://doi.org/10.5194/bg-21-761-2024, https://doi.org/10.5194/bg-21-761-2024, 2024
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Ocean alkalinity enhancement (OAE) is a promising approach to remove CO2 by accelerating natural rock weathering. However, some of the alkaline substances contain trace metals which could be toxic to marine life. By exposing three representative phytoplankton species to Ni released from alkaline materials, we observed varying responses of phytoplankton to nickel concentrations, suggesting caution should be taken and toxic thresholds should be avoided in OAE with Ni-rich materials.
Olmo Miguez-Salas, Angelika Brandt, Henry Knauber, and Torben Riehl
Biogeosciences, 21, 641–655, https://doi.org/10.5194/bg-21-641-2024, https://doi.org/10.5194/bg-21-641-2024, 2024
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In the deep sea, the interaction between benthic fauna (tracemakers) and substrate can be preserved as traces (i.e. lebensspuren), which are common features of seafloor landscapes, rendering them promising proxies for inferring biodiversity from marine images. No general correlation was observed between traces and benthic fauna. However, a local correlation was observed between specific stations depending on unknown tracemakers, tracemaker behaviour, and lebensspuren morphotypes.
Cale A. Miller, Pierre Urrutti, Jean-Pierre Gattuso, Steeve Comeau, Anaïs Lebrun, Samir Alliouane, Robert W. Schlegel, and Frédéric Gazeau
Biogeosciences, 21, 315–333, https://doi.org/10.5194/bg-21-315-2024, https://doi.org/10.5194/bg-21-315-2024, 2024
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This work describes an experimental system that can replicate and manipulate environmental conditions in marine or aquatic systems. Here, we show how the temperature and salinity of seawater delivered from a fjord is manipulated to experimental tanks on land. By constantly monitoring temperature and salinity in each tank via a computer program, the system continuously adjusts automated flow valves to ensure the seawater in each tank matches the targeted experimental conditions.
Rachel A. Kruft Welton, George Hoppit, Daniela N. Schmidt, James D. Witts, and Benjamin C. Moon
Biogeosciences, 21, 223–239, https://doi.org/10.5194/bg-21-223-2024, https://doi.org/10.5194/bg-21-223-2024, 2024
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We conducted a meta-analysis of known experimental literature examining how marine bivalve growth rates respond to climate change. Growth is usually negatively impacted by climate change. Bivalve eggs/larva are generally more vulnerable than either juveniles or adults. Available data on the bivalve response to climate stressors are biased towards early growth stages (commercially important in the Global North), and many families have only single experiments examining climate change impacts.
Vincent Mouchi, Christophe Pecheyran, Fanny Claverie, Cécile Cathalot, Marjolaine Matabos, Yoan Germain, Olivier Rouxel, Didier Jollivet, Thomas Broquet, and Thierry Comtet
Biogeosciences, 21, 145–160, https://doi.org/10.5194/bg-21-145-2024, https://doi.org/10.5194/bg-21-145-2024, 2024
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The impact of deep-sea mining will depend critically on the ability of larval dispersal of hydrothermal mollusks to connect and replenish natural populations. However, assessing connectivity is extremely challenging, especially in the deep sea. Here, we investigate the potential of using the chemical composition of larval shells to discriminate larval origins between multiple hydrothermal sites in the southwest Pacific. Our results confirm that this method can be applied with high accuracy.
Anna-Marie Winter, Nadezda Vasilyeva, and Artem Vladimirov
Biogeosciences, 20, 3683–3716, https://doi.org/10.5194/bg-20-3683-2023, https://doi.org/10.5194/bg-20-3683-2023, 2023
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There is an increasing number of fish in poor state, and many do not recover, even when fishing pressure is ceased. An Allee effect can hinder population recovery because it suppresses the fish's productivity at low abundance. With a model fitted to 17 Atlantic cod stocks, we find that ocean warming and fishing can cause an Allee effect. If present, the Allee effect hinders fish recovery. This shows that Allee effects are dynamic, not uncommon, and calls for precautionary management measures.
Afrah Alothman, Daffne López-Sandoval, Carlos M. Duarte, and Susana Agustí
Biogeosciences, 20, 3613–3624, https://doi.org/10.5194/bg-20-3613-2023, https://doi.org/10.5194/bg-20-3613-2023, 2023
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This study investigates bacterial dissolved inorganic carbon (DIC) fixation in the Red Sea, an oligotrophic ecosystem, using stable-isotope labeling and spectroscopy. The research reveals that bacterial DIC fixation significantly contributes to total DIC fixation, in the surface and deep water. The study demonstrates that as primary production decreases, the role of bacterial DIC fixation increases, emphasizing its importance with photosynthesis in estimating oceanic carbon dioxide production.
Arianna Zampollo, Thomas Cornulier, Rory O'Hara Murray, Jacqueline Fiona Tweddle, James Dunning, and Beth E. Scott
Biogeosciences, 20, 3593–3611, https://doi.org/10.5194/bg-20-3593-2023, https://doi.org/10.5194/bg-20-3593-2023, 2023
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This paper highlights the use of the bottom mixed layer depth (BMLD: depth between the end of the pycnocline and the mixed layer below) to investigate subsurface Chlorophyll a (a proxy of primary production) in temperate stratified shelf waters. The strict correlation between subsurface Chl a and BMLD becomes relevant in shelf-productive waters where multiple stressors (e.g. offshore infrastructure) will change the stratification--mixing balance and related carbon fluxes.
Marco Fusi, Sylvain Rigaud, Giovanna Guadagnin, Alberto Barausse, Ramona Marasco, Daniele Daffonchio, Julie Régis, Louison Huchet, Capucine Camin, Laura Pettit, Cristina Vina-Herbon, and Folco Giomi
Biogeosciences, 20, 3509–3521, https://doi.org/10.5194/bg-20-3509-2023, https://doi.org/10.5194/bg-20-3509-2023, 2023
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Oxygen availability in marine water and freshwater is very variable at daily and seasonal scales. The dynamic nature of oxygen fluctuations has important consequences for animal and microbe physiology and ecology, yet it is not fully understood. In this paper, we showed the heterogeneous nature of the aquatic oxygen landscape, which we defined here as the
oxyscape, and we addressed the importance of considering the oxyscape in the modelling and managing of aquatic ecosystems.
Anne L. Morée, Tayler M. Clarke, William W. L. Cheung, and Thomas L. Frölicher
Biogeosciences, 20, 2425–2454, https://doi.org/10.5194/bg-20-2425-2023, https://doi.org/10.5194/bg-20-2425-2023, 2023
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Ocean temperature and oxygen shape marine habitats together with species’ characteristics. We calculated the impacts of projected 21st-century warming and oxygen loss on the contemporary habitat volume of 47 marine species and described the drivers of these impacts. Most species lose less than 5 % of their habitat at 2 °C of global warming, but some species incur losses 2–3 times greater than that. We also calculate which species may be most vulnerable to climate change and why this is the case.
Markus A. Min, David M. Needham, Sebastian Sudek, Nathan Kobun Truelove, Kathleen J. Pitz, Gabriela M. Chavez, Camille Poirier, Bente Gardeler, Elisabeth von der Esch, Andrea Ludwig, Ulf Riebesell, Alexandra Z. Worden, and Francisco P. Chavez
Biogeosciences, 20, 1277–1298, https://doi.org/10.5194/bg-20-1277-2023, https://doi.org/10.5194/bg-20-1277-2023, 2023
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Emerging molecular methods provide new ways of understanding how marine communities respond to changes in ocean conditions. Here, environmental DNA was used to track the temporal evolution of biological communities in the Peruvian coastal upwelling system and in an adjacent enclosure where upwelling was simulated. We found that the two communities quickly diverged, with the open ocean being one found during upwelling and the enclosure evolving to one found under stratified conditions.
Wojciech Majewski, Witold Szczuciński, and Andrew J. Gooday
Biogeosciences, 20, 523–544, https://doi.org/10.5194/bg-20-523-2023, https://doi.org/10.5194/bg-20-523-2023, 2023
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We studied foraminifera living in the fjords of South Georgia, a sub-Antarctic island sensitive to climate change. As conditions in water and on the seafloor vary, different associations of these microorganisms dominate far inside, in the middle, and near fjord openings. Assemblages in inner and middle parts of fjords are specific to South Georgia, but they may become widespread with anticipated warming. These results are important for interpretating fossil records and monitoring future change.
Allanah Joy Paul, Lennart Thomas Bach, Javier Arístegui, Elisabeth von der Esch, Nauzet Hernández-Hernández, Jonna Piiparinen, Laura Ramajo, Kristian Spilling, and Ulf Riebesell
Biogeosciences, 19, 5911–5926, https://doi.org/10.5194/bg-19-5911-2022, https://doi.org/10.5194/bg-19-5911-2022, 2022
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We investigated how different deep water chemistry and biology modulate the response of surface phytoplankton communities to upwelling in the Peruvian coastal zone. Our results show that the most influential drivers were the ratio of inorganic nutrients (N : P) and the microbial community present in upwelling source water. These led to unexpected and variable development in the phytoplankton assemblage that could not be predicted by the amount of inorganic nutrients alone.
Hanna M. Kauko, Philipp Assmy, Ilka Peeken, Magdalena Różańska-Pluta, Józef M. Wiktor, Gunnar Bratbak, Asmita Singh, Thomas J. Ryan-Keogh, and Sebastien Moreau
Biogeosciences, 19, 5449–5482, https://doi.org/10.5194/bg-19-5449-2022, https://doi.org/10.5194/bg-19-5449-2022, 2022
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This article studies phytoplankton (microscopic
plantsin the ocean capable of photosynthesis) in Kong Håkon VII Hav in the Southern Ocean. Different species play different roles in the ecosystem, and it is therefore important to assess the species composition. We observed that phytoplankton blooms in this area are formed by large diatoms with strong silica armors, which can lead to high silica (and sometimes carbon) export to depth and be important prey for krill.
Chloe Carbonne, Steeve Comeau, Phoebe T. W. Chan, Keyla Plichon, Jean-Pierre Gattuso, and Núria Teixidó
Biogeosciences, 19, 4767–4777, https://doi.org/10.5194/bg-19-4767-2022, https://doi.org/10.5194/bg-19-4767-2022, 2022
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For the first time, our study highlights the synergistic effects of a 9-month warming and acidification combined stress on the early life stages of a Mediterranean azooxanthellate coral, Astroides calycularis. Our results predict a decrease in dispersion, settlement, post-settlement linear extention, budding and survival under future global change and that larvae and recruits of A. calycularis are stages of interest for this Mediterranean coral resistance, resilience and conservation.
Iris E. Hendriks, Anna Escolano-Moltó, Susana Flecha, Raquel Vaquer-Sunyer, Marlene Wesselmann, and Núria Marbà
Biogeosciences, 19, 4619–4637, https://doi.org/10.5194/bg-19-4619-2022, https://doi.org/10.5194/bg-19-4619-2022, 2022
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Seagrasses are marine plants with the capacity to act as carbon sinks due to their high primary productivity, using carbon for growth. This capacity can play a key role in climate change mitigation. We compiled and published data showing that two Mediterranean seagrass species have different metabolic rates, while the study method influences the rates of the measurements. Most communities act as carbon sinks, while the western basin might be more productive than the eastern Mediterranean.
Raúl Tapia, Sze Ling Ho, Hui-Yu Wang, Jeroen Groeneveld, and Mahyar Mohtadi
Biogeosciences, 19, 3185–3208, https://doi.org/10.5194/bg-19-3185-2022, https://doi.org/10.5194/bg-19-3185-2022, 2022
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We report census counts of planktic foraminifera in depth-stratified plankton net samples off Indonesia. Our results show that the vertical distribution of foraminifera species routinely used in paleoceanographic reconstructions varies in hydrographically distinct regions, likely in response to food availability. Consequently, the thermal gradient based on mixed layer and thermocline dwellers also differs for these regions, suggesting potential implications for paleoceanographic reconstructions.
Ricardo González-Gil, Neil S. Banas, Eileen Bresnan, and Michael R. Heath
Biogeosciences, 19, 2417–2426, https://doi.org/10.5194/bg-19-2417-2022, https://doi.org/10.5194/bg-19-2417-2022, 2022
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In oceanic waters, the accumulation of phytoplankton biomass in winter, when light still limits growth, is attributed to a decrease in grazing as the mixed layer deepens. However, in coastal areas, it is not clear whether winter biomass can accumulate without this deepening. Using 21 years of weekly data, we found that in the Scottish coastal North Sea, the seasonal increase in light availability triggers the accumulation of phytoplankton biomass in winter, when light limitation is strongest.
Birgit Koehler, Mårten Erlandsson, Martin Karlsson, and Lena Bergström
Biogeosciences, 19, 2295–2312, https://doi.org/10.5194/bg-19-2295-2022, https://doi.org/10.5194/bg-19-2295-2022, 2022
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Understanding species richness patterns remains a challenge for biodiversity management. We estimated fish species richness over a coastal salinity gradient (3–32) with a method that allowed comparing data from various sources. Species richness was 3-fold higher at high vs. low salinity, and salinity influenced species’ habitat preference, mobility and feeding type. If climate change causes upper-layer freshening of the Baltic Sea, further shifts along the identified patterns may be expected.
Uri Obolski, Thomas Wichard, Alvaro Israel, Alexander Golberg, and Alexander Liberzon
Biogeosciences, 19, 2263–2271, https://doi.org/10.5194/bg-19-2263-2022, https://doi.org/10.5194/bg-19-2263-2022, 2022
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The algal genus Ulva plays a major role in coastal ecosystems worldwide and is a promising prospect as an seagriculture crop. A substantial hindrance to cultivating Ulva arises from sudden sporulation, leading to biomass loss. This process is not yet well understood. Here, we characterize the dynamics of Ulva growth, considering the potential impact of sporulation inhibitors, using a mathematical model. Our findings are an essential step towards understanding the dynamics of Ulva growth.
Emanuela Fanelli, Samuele Menicucci, Sara Malavolti, Andrea De Felice, and Iole Leonori
Biogeosciences, 19, 1833–1851, https://doi.org/10.5194/bg-19-1833-2022, https://doi.org/10.5194/bg-19-1833-2022, 2022
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Zooplankton play a key role in marine ecosystems, forming the base of the marine food web and a link between primary producers and higher-order consumers, such as fish. This aspect is crucial in the Adriatic basin, one of the most productive and overexploited areas of the Mediterranean Sea. A better understanding of community and food web structure and their response to water mass changes is essential under a global warming scenario, as zooplankton are sensitive to climate change.
Masaya Yoshikai, Takashi Nakamura, Rempei Suwa, Sahadev Sharma, Rene Rollon, Jun Yasuoka, Ryohei Egawa, and Kazuo Nadaoka
Biogeosciences, 19, 1813–1832, https://doi.org/10.5194/bg-19-1813-2022, https://doi.org/10.5194/bg-19-1813-2022, 2022
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This study presents a new individual-based vegetation model to investigate salinity control on mangrove productivity. The model incorporates plant hydraulics and tree competition and predicts unique and complex patterns of mangrove forest structures that vary across soil salinity gradients. The presented model does not hold an empirical expression of salinity influence on productivity and thus may provide a better understanding of mangrove forest dynamics in future climate change.
Coulson A. Lantz, William Leggat, Jessica L. Bergman, Alexander Fordyce, Charlotte Page, Thomas Mesaglio, and Tracy D. Ainsworth
Biogeosciences, 19, 891–906, https://doi.org/10.5194/bg-19-891-2022, https://doi.org/10.5194/bg-19-891-2022, 2022
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Coral bleaching events continue to drive the degradation of coral reefs worldwide. In this study we measured rates of daytime coral reef community calcification and photosynthesis during a reef-wide bleaching event. Despite a measured decline in coral health across several taxa, there was no change in overall daytime community calcification and photosynthesis. These findings highlight potential limitations of these community-level metrics to reflect actual changes in coral health.
Hyewon Heather Kim, Jeff S. Bowman, Ya-Wei Luo, Hugh W. Ducklow, Oscar M. Schofield, Deborah K. Steinberg, and Scott C. Doney
Biogeosciences, 19, 117–136, https://doi.org/10.5194/bg-19-117-2022, https://doi.org/10.5194/bg-19-117-2022, 2022
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Heterotrophic marine bacteria are tiny organisms responsible for taking up organic matter in the ocean. Using a modeling approach, this study shows that characteristics (taxonomy and physiology) of bacteria are associated with a subset of ecological processes in the coastal West Antarctic Peninsula region, a system susceptible to global climate change. This study also suggests that bacteria will become more active, in particular large-sized cells, in response to changing climates in the region.
Alice E. Webb, Didier M. de Bakker, Karline Soetaert, Tamara da Costa, Steven M. A. C. van Heuven, Fleur C. van Duyl, Gert-Jan Reichart, and Lennart J. de Nooijer
Biogeosciences, 18, 6501–6516, https://doi.org/10.5194/bg-18-6501-2021, https://doi.org/10.5194/bg-18-6501-2021, 2021
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The biogeochemical behaviour of shallow reef communities is quantified to better understand the impact of habitat degradation and species composition shifts on reef functioning. The reef communities investigated barely support reef functions that are usually ascribed to conventional coral reefs, and the overall biogeochemical behaviour is found to be similar regardless of substrate type. This suggests a decrease in functional diversity which may therefore limit services provided by this reef.
Emmanuel Devred, Andrea Hilborn, and Cornelia Elizabeth den Heyer
Biogeosciences, 18, 6115–6132, https://doi.org/10.5194/bg-18-6115-2021, https://doi.org/10.5194/bg-18-6115-2021, 2021
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A theoretical model of grey seal seasonal abundance on Sable Island (SI) coupled with chlorophyll-a concentration [chl-a] measured by satellite revealed the impact of seal nitrogen fertilization on the surrounding waters of SI, Canada. The increase in seals from about 100 000 in 2003 to about 360 000 in 2018 during the breeding season is consistent with an increase in [chl-a] leeward of SI. The increase in seal abundance explains 8 % of the [chl-a] increase.
Julie Meilland, Michael Siccha, Maike Kaffenberger, Jelle Bijma, and Michal Kucera
Biogeosciences, 18, 5789–5809, https://doi.org/10.5194/bg-18-5789-2021, https://doi.org/10.5194/bg-18-5789-2021, 2021
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Planktonic foraminifera population dynamics has long been assumed to be controlled by synchronous reproduction and ontogenetic vertical migration (OVM). Due to contradictory observations, this concept became controversial. We here test it in the Atlantic ocean for four species of foraminifera representing the main clades. Our observations support the existence of synchronised reproduction and OVM but show that more than half of the population does not follow the canonical trajectory.
Federica Maggioni, Mireille Pujo-Pay, Jérome Aucan, Carlo Cerrano, Barbara Calcinai, Claude Payri, Francesca Benzoni, Yves Letourneur, and Riccardo Rodolfo-Metalpa
Biogeosciences, 18, 5117–5140, https://doi.org/10.5194/bg-18-5117-2021, https://doi.org/10.5194/bg-18-5117-2021, 2021
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Based on current experimental evidence, climate change will affect up to 90 % of coral reefs worldwide. The originality of this study arises from our recent discovery of an exceptional study site where environmental conditions (temperature, pH, and oxygen) are even worse than those forecasted for the future.
While these conditions are generally recognized as unfavorable for marine life, we found a rich and abundant coral reef thriving under such extreme environmental conditions.
Nisan Sariaslan and Martin R. Langer
Biogeosciences, 18, 4073–4090, https://doi.org/10.5194/bg-18-4073-2021, https://doi.org/10.5194/bg-18-4073-2021, 2021
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Analyses of foraminiferal assemblages from the Mamanguape mangrove estuary (northern Brazil) revealed highly diverse, species-rich, and structurally complex biotas. The atypical fauna resembles shallow-water offshore assemblages and are interpreted to be the result of highly saline ocean waters penetrating deep into the estuary. The findings contrast with previous studies, have implications for the fossil record, and provide novel perspectives for reconstructing mangrove environments.
Jutta E. Wollenburg, Jelle Bijma, Charlotte Cremer, Ulf Bickmeyer, and Zora Mila Colomba Zittier
Biogeosciences, 18, 3903–3915, https://doi.org/10.5194/bg-18-3903-2021, https://doi.org/10.5194/bg-18-3903-2021, 2021
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Cultured at in situ high-pressure conditions Cibicides and Cibicidoides taxa develop lasting ectoplasmic structures that cannot be retracted or resorbed. An ectoplasmic envelope surrounds their test and may protect the shell, e.g. versus carbonate aggressive bottom water conditions. Ectoplasmic roots likely anchor the specimens in areas of strong bottom water currents, trees enable them to elevate themselves above ground, and twigs stabilize and guide the retractable pseudopodial network.
Kumar Nimit
Biogeosciences, 18, 3631–3635, https://doi.org/10.5194/bg-18-3631-2021, https://doi.org/10.5194/bg-18-3631-2021, 2021
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The Indian Ocean Rim hosts many of the underdeveloped and emerging economies that depend on ocean resources for the livelihood of millions. Operational ocean information services cater to the requirements of resource managers and end-users to efficiently harness resources, mitigate threats and ensure safety. This paper outlines existing tools and explores the ongoing research that has the potential to convert the findings into operational services in the near- to midterm.
Finn Mielck, Rune Michaelis, H. Christian Hass, Sarah Hertel, Caroline Ganal, and Werner Armonies
Biogeosciences, 18, 3565–3577, https://doi.org/10.5194/bg-18-3565-2021, https://doi.org/10.5194/bg-18-3565-2021, 2021
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Marine sand mining is becoming more and more important to nourish fragile coastlines that face global change. We investigated the largest sand extraction site in the German Bight. The study reveals that after more than 35 years of mining, the excavation pits are still detectable on the seafloor while the sediment composition has largely changed. The organic communities living in and on the seafloor were strongly decimated, and no recovery is observable towards previous conditions.
Cited articles
Brander, K.: Reduced growth in Baltic Sea cod may be due to mild hypoxia,
ICES J. Mar. Sci., 77, 2003–2005, https://doi.org/10.1093/icesjms/fsaa041,
2020.
Breitburg, D.: Effects of hypoxia, and the balance between hypoxia and
enrichment, on coastal fishes and fisheries, Estuaries, 25, 767–781,
https://doi.org/10.1007/BF02804904, 2002.
Breitburg, D., Levin, L. A., Oschlies, A., Grégoire, M., Chavez, F. P.,
Conley, D. J., Garçon, V., Gilbert, D., Gutiérrez, D., Isensee, K.,
Jacinto, G. S., Limburg, K. E., Montes, I., Naqvi, S. W. A., Pitcher, G. C.,
Rabalais, N. N., Roman, M. R., Rose, K. A., Seibel, B. A., Telszewski, M.,
Yasuhara, M., and Zhang, J.: Declining oxygen in the global ocean and
coastal waters, Science, 359, eaam7240,
https://doi.org/10.1126/science.aam7240, 2018.
Campbell, L. A. and Rice, J. A.: Effects of hypoxia-induced habitat
compression on growth of juvenile fish in the Neuse River Estuary, North
Carolina, USA. Mar. Ecol. Prog. Ser., 497, 199–213,
https://doi.org/10.3354/meps10607, 2014.
Carstensen, J., Andersen, J. H., Gustafsson, B. G., and Conley, D. J.:
Deoxygenation of the Baltic Sea during the last century, P. Natl. Acad.
Sci. USA, 111, 5628–5633, https://doi.org/10.1073/pnas.1323156111, 2014.
Casini, M., Rouyer, T., Bartolino V., Larson N., and Grygiel, W.: Density
dependence in space and time: opposite synchronous variations in population
distribution and body condition in the Baltic Sea sprat (Sprattus sprattus) over three decades, Plos One, 9, e92278, https://doi.org/10.1371/journal.pone.0092278, 2014.
Casini, M., Käll, F., Hansson, M., Plikshs, M., Baranova, T., Karlsson,
O., Lundström, K., Neuenfeldt, S., Gårdmark, G., and Hjelm J.:
Hypoxic areas, density dependence and food limitation drive the body
condition of a heavily exploited marine fish predator, R. Soc. Open Sci., 3,
160416, https://doi.org/10.1098/rsos.160416, 2016a.
Casini, M., Eero, M., Carlshamre, S., and Lövgren, J.: Using alternative
biological information in stock assessment: condition-corrected natural
mortality of Eastern Baltic cod, ICES J. Mar. Sci., 73, 2625–2631,
https://doi.org/10.1093/icesjms/fsw117, 2016b.
Chabot, D. and Dutil, J.-D.: Reduced growth of Atlantic cod in non-lethal
hypoxic conditions, J. Fish Biol., 55, 472–491,
https://doi.org/10.1111/j.1095-8649.1999.tb00693.x, 1999.
Claireaux, G. and Chabot, D.: Responses by fishes to environmental hypoxia:
integration through Fry's concept of aerobic metabolic scope, J. Fish Biol.,
88, 232–251, https://doi.org/10.1111/jfb.12833 , 2016.
Cleveland, W. S.: Visualizing data, Hobart Press, Summit, NJ, 1993.
Conley, D. G. Björck, S., Bonsdorff, E., Carstensen, J., Destouni, G.,
Gustafsson, B. G., Hietanen, S., Kortekaas, M., Kuosa, H., Meier, H. E. M.,
Müller-Karulis, B., Nordberg, K., Norkko, A., Nürnberg, G.,
Pitkänen, H., Rabalais, N. N., Rosenberg, R., Savchuk, O. P., Slomp, C.
P., Voss, M., Wulff, F., and Zillén L.: Hypoxia-related processes in the
Baltic Sea, Environ. Sci. Technol., 43, 3412–3420,
https://doi.org/10.1021/es802762a, 2009.
Diaz, R. J., and Rosenberg, R.: Spreading dead zones and consequences for
marine ecosystems, Science, 321, 926–929,
https://doi.org/10.1126/science.1156401, 2008.
Domenici, P., Lefrançois, C., and Shingles, A.: Hypoxia and the
antipredator behaviours of fishes, Phil. Trans. R. Soc. B, 362, 2015–2121,
https://doi.org/10.1098/rstb.2007.2103, 2007.
Eby, L. A. and Crowder, L. B.: Hypoxia-based habitat compression in the
Neuse River Estuary: context-dependent shifts in behavioral avoidance
thresholds, Can. J. Fish. Aquat. Sci., 59, 952–965,
https://doi.org/10.1139/f02-067, 2002.
Eby, L. A., Crowder, L. B., McClellan, C. M., Peterson, C. H., and Powers,
M. J.: Habitat degradation from intermittent hypoxia: impacts on demersal
fishes, Mar. Ecol. Prog. Ser., 291, 249–261,
https://doi.org/10.3354/meps291249, 2005.
Eero, M., Vinther, M., Haslob, H., Huwer, B., Casini, M., Storr-Paulsen, M.,
and Köster, F. W.: Spatial management of marine resources can enhance
the recovery of predators and avoid local depletion of forage fish, Cons.
Lett., 5, 486–492, https://doi.org/10.1111/j.1755-263X.2012.00266.x, 2012.
Eero, M., Hjelm, J., Behrens, J., Buckmann, Cardinale, M., K., Casini, M., Gasyukov, P., Holmgren, N., Horbowy, J., Hüssy, K., Kirkegaard, E., Kornilovs, G., Krumme, U., Köster, F.W., Oeberst, R., Plikshs, M., Radtke, K., Raid, T., Schmidt, J., Tomczak, M., Vinther, M., Zimmermann, C., and Storr-Paulsen, M.: Eastern Baltic cod in distress: biological changes and challenges for stock assessment, ICES J. Mar. Sci., 72, 2180–2186, https://doi.org/10.1093/icesjms/fsv109, 2015.
Ekau, W., Auel, H., Pörtner, H.-O., and Gilbert, D.: Impacts of hypoxia on the structure and processes in pelagic communities (zooplankton, macro-invertebrates and fish), Biogeosciences, 7, 1669–1699, https://doi.org/10.5194/bg-7-1669-2010, 2010.
Haase, K., Orio, A., Pawlak, J., Pachur, M., and Casini, M.: Diet of
dominant demersal fish species in the Baltic Sea: is flounder steeling
benthic food from cod?, Mar. Ecol. Progr. Ser., 645, 159–170,
https://doi.org/10.3354/meps13360, 2020.
Hastie, T. J. and Tibshirani, R. J.: Generalized additive models,
Chapman and Hall/CRC, London, UK, 1990.
Herbert, N. A. and Steffensen, J. F.: The response of Atlantic cod, Gadus morhua, to progressive hypoxia: fish swimming speed and physiological stress, Mar. Biol., 147, 1403–1412, https://doi.org/10.1007/s00227-005-0003-8, 2005.
Horbowy, J., Podolska, M., and Nadolna-Ałtyn, K.: Increasing occurrence of
anisakid nematodes in the liver of cod (Gadus morhua) from the Baltic Sea: Does infection affect the condition and mortality of fish?, Fish. Res., 179, 99–103, https://doi.org/10.1016/j.shres.2016.02.011, 2016.
Köster, F. W., Huwer, B., Hinrichsen, H.-H., Neumann, V., Makarchouk, A., Eero, M., V. Dewitz, B., Hüssy, K., Tomkiewicz, J., Margonski, P., Temming, A., Hermann, J.-P., Oesterwind, D., Dierking, J., Kotterba, P., and Plikshs, M.: Eastern Baltic cod recruitment revisited-dynamics and
impacting factors, ICES J. Mar. Sci., 74, 3–19, https://doi.org/10.1093/icesjms/fsw172, 2017.
Levin, L. A., Ekau, W., Gooday, A. J., Jorissen, F., Middelburg, J. J., Naqvi, S. W. A., Neira, C., Rabalais, N. N., and Zhang, J.: Effects of natural and human-induced hypoxia on coastal benthos, Biogeosciences, 6, 2063–2098, https://doi.org/10.5194/bg-6-2063-2009, 2009.
Limburg, K. and Casini, M.: Otolith chemistry indicates recent worsened
Baltic cod condition is linked to hypoxia exposure, Biol. Lett., 15,
20190352, https://doi.org/10.1098/rsbl.2019.0352, 2019.
Mehner, T. and Kasprzak, P.: Partial diel vertical migrations in pelagic
fish, J. Anim. Ecol., 80, 761–770,
https://doi.org/10.1111/j.1365-2656.2011.01823.x, 2011.
Mion, M., Thorsen, A., Dierking, J., Herrmann, J.-P., Huwer, B., Vitale, F.,
von Dewitz, B., and Casini, M.: Effect of fish length and nutritional
condition on the fecundity of distressed Atlantic cod Gadus morhua from the Baltic Sea, J. Fish Biol., 92, 1016–1034, https://doi.org/10.1111/jfb.13563, 2018.
Mion, M., Hilvarsson, A., Hüssy, K., Krumme, U., Krüger-Johnsen, M.,
McQueen, K., Mohamed, E., Motyka, R., Orio, A., Plikšs, M., Radtke, K.,
and Casini, M.: Historical growth of Eastern Baltic cod (Gadus morhua): setting a baseline with international tagging data, Fish. Res., 223, 105442, https://doi.org/10.1016/j.fishres.2019.105442, 2020.
Neuenfeldt, S., Bartolino, V., Orio, A., Andersen, K. H., Andersen, N. G.,
Niiranen, S., Bergström, U., Ustups, D. Kallasvuo, M., Kulatska, N., and
Casini, M.: Feeding and growth of Atlantic cod (Gadus morhua L.) in the Eastern Baltic Sea under environmental change, ICES J. Mar. Sci., 77, 624–632, https://doi.org/10.1093/icesjms/fsz224, 2020.
Nilsson, G. E. and Östlund-Nilsson, S.: Does size matter for hypoxia
tolerance in fish?, Biol. Rev., 83, 173–189,
https://doi.org/10.1111/j.1469-185X.2008.00038.x, 2008.
Orio, A., Florin, A.-B., Bergström, U., Šics, I., Baranova, T., and
Casini, M.: Modelling indices of abundance and size-based indicators of cod
and flounder stocks in the Baltic Sea using newly standardized trawl survey
data, ICES J. Mar. Sci., 74, 1322–1333, https://doi.org/10.1093/icesjms/fsx005, 2017.
Orio, A., Bergström, U., Florin, A.-B., Lehmann, A., Šics, I., and
Casini, M.: Spatial contraction of demersal fish populations in a large
marine ecosystem, J. Biogeogr., 46, 633–645,
https://doi.org/10.1111/jbi.13510, 2019.
Pichavant, K., Person-Le-Ruyet, J., Le Bayon, N., Severe, A., Le Roux, A.,
and Boeuf, G.: Comparative effects of long-term hypoxia on growth, feeding
and oxygen consumption in juvenile turbot and European sea bass, J. Fish
Biol. 59, 875–883, https://doi.org/10.1111/j.1095-8649.2001.tb00158.x,
2001.
Rabalais, N. N, Turner, R. E, and Wiseman Jr, W. J.: Gulf of Mexico hypoxia,
A.K.A “The dead zone”, Annu. Rev. Ecol. Syst., 33, 235–263,
https://doi.org/10.1146/annurev.ecolsys.33.010802.150513, 2002.
Reusch, T. B. H., Dierking, J., Andersson, H., Bonsdorff, E., Carstensen,
J., Casini, M., Czajkowski, M., Hasler, B., Hinsby, K., Hyytiäinen, K.,
Johannesson, K., Jomaa, S., Jormalainen, V., Kuosa, H., Kurland, S., Laikre,
L., MacKenzie, B. R., Margonski, P., Melzner, F., Oesterwind, D., Ojaveer,
H., Refsgaard, J. C., Sandström, A., Schwarz, G., Tonderski, K., Winder,
M., and Zandersen, M.: The Baltic Sea as a time machine for the future
coastal ocean. Sci. Adv., 4, eaar8195,
https://doi.org/10.1126/sciadv.aar8195, 2018.
Røjbek, M. C., Jacobsen, C., Tomkiewicz, J., and Støttrup, J. G.: Linking lipid dynamics with the reproductive cycle in Baltic cod Gadus morhua, Mar. Ecol. Progr. Ser., 471, 215–234, https://https://doi.org/10.3354/meps10012, 2012.
Schaber, M., Hinrichsen, H.-H., and Gröger, J.: Seasonal changes in
vertical distribution patterns of cod (Gadus morhua) in the Bornholm Basin, Central Baltic Sea, Fish. Oceanogr., 21, 33–43,
https://doi.org/10.1111/j.1365-2419.2011.00607.x, 2012.
Sokolova, M., Buchmann, K., Huwer, B., Kania, P. W., Krumme, U., Galatius,
A., Hemmer-Hansen, J., and Behrens, J. W.: Spatial patterns in infection of
cod Gadus morhua with the seal-associated liver worm Contracaecum osculatum from the Skagerrak to the central
Baltic Sea, Mar. Ecol. Progr. Ser., 606, 105–118,
https://doi.org/10.3354/meps12773, 2018.
Stramma, L., Prince E. D., Schmidtko, S., Luo, J., Hoolihan, J. P., Visbeck,
M, Wallace, D. W. R., Brandt, P., and Körtzinger, A.: Expansion of
oxygen minimum zones may reduce available habitat for tropical pelagic
fishes, Nat. Clim. Change, 2, 33–37, https://doi.org/10.1038/nclimate1304,
2012.
Vaquer-Sunyer, R. and Duarte, C. M.: Thresholds of hypoxia for marine
biodiversity, P. Natl Acad. Sci. USA, 105, 15452–15457,
https://doi.org/10.1073/pnas.0803833105, 2008.
Wu, R. S. S.: Hypoxia: from molecular responses to ecosystem responses, Mar.
Pollut. Bull. 45, 35–45, https://doi.org/10.1016/S0025-326X(02)00061-9,
2002.
Short summary
In the past 20 years the condition of the eastern Baltic cod has dropped, with large implications for the fishery. Our results show that simultaneously the cod population has moved deeper while low-oxygenated waters detrimental for cod growth have become shallower. Cod have thus dwelled more in detrimental waters, explaining the drop in its condition. This study, using long-term fish and hydrological monitoring data, evidences the impact of deoxygenation on fish biology and fishing.
In the past 20 years the condition of the eastern Baltic cod has dropped, with large...
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