Articles | Volume 16, issue 16
https://doi.org/10.5194/bg-16-3133-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/bg-16-3133-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
21 Aug 2019
Research article |
| 21 Aug 2019
| 21 Aug 2019
Observations of deep-sea fishes and mobile scavengers from the abyssal DISCOL experimental mining area
Department of Oceanography, University of Hawaii, 1000 Pope Rd,
Honolulu, HI 96821, USA
Astrid B. Leitner
Department of Oceanography, University of Hawaii, 1000 Pope Rd,
Honolulu, HI 96821, USA
Sage Morningstar
Department of Oceanography, University of Hawaii, 1000 Pope Rd,
Honolulu, HI 96821, USA
Yann Marcon
Alfred Wegener Institute, Helmholtz Centre for Polar and Marine
Research, Am Handelshafen 12, 27570 Bremerhaven, Germany
MARUM Center for Marine Environmental Sciences and Department of
Geosciences, University of Bremen, 28359 Bremen, Germany
Jens Greinert
GEOMAR, Helmholtz Centre for Ocean Research, Wischhofstrasse 1–3, 24148 Kiel, Germany
Autun Purser
Alfred Wegener Institute, Helmholtz Centre for Polar and Marine
Research, Am Handelshafen 12, 27570 Bremerhaven, Germany
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Autun Purser, Laura Hehemann, Lilian Boehringer, Ellen Werner, Santiago E. A. Pineda-Metz, Lucie Vignes, Axel Nordhausen, Moritz Holtappels, and Frank Wenzhoefer
Earth Syst. Sci. Data, 14, 3635–3648, https://doi.org/10.5194/essd-14-3635-2022, https://doi.org/10.5194/essd-14-3635-2022, 2022
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Within this paper we present the seafloor images, maps and acoustic camera data collected by a towed underwater research platform deployed in 20 locations across the eastern Weddell Sea, Antarctica, during the PS124 COSMUS expedition with the research icebreaker RV Polarstern in 2021. The 20 deployments highlight the great variability in seafloor structure and faunal communities present. Of key interest was the discovery of the largest fish nesting colony discovered globally to date.
Wei Chen, Joanna Staneva, Sebastian Grayek, Johannes Schulz-Stellenfleth, and Jens Greinert
Nat. Hazards Earth Syst. Sci., 22, 1683–1698, https://doi.org/10.5194/nhess-22-1683-2022, https://doi.org/10.5194/nhess-22-1683-2022, 2022
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This study links the occurrence and persistence of density stratification in the southern North Sea to the increased number of extreme marine heat waves. The study further identified the role of the cold spells at the early stage of a year to the intensity of thermal stratification in summer. In a broader context, the research will have fundamental significance for further discussion of the secondary effects of heat wave events, such as in ecosystems, fisheries, and sediment dynamics.
Autun Purser, Simon Dreutter, Huw Griffiths, Laura Hehemann, Kerstin Jerosch, Axel Nordhausen, Dieter Piepenburg, Claudio Richter, Henning Schröder, and Boris Dorschel
Earth Syst. Sci. Data, 13, 609–615, https://doi.org/10.5194/essd-13-609-2021, https://doi.org/10.5194/essd-13-609-2021, 2021
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This dataset comprises 26-megapixel seafloor images collected from below ice and steeply sloped regions of the Southern Ocean (the western Weddell Sea; the Powell Basin; and the rapidly shallowing, iceberg-scoured Nachtigaller Shoal). These data were collected with the Ocean Floor Observation and Bathymetry System (OFOBS), an advanced towed camera platform incorporating various sonar devices to aid in hazard avoidance and seafloor mapping, for use in challenging, high-relief seafloor areas.
Timm Schoening, Autun Purser, Daniel Langenkämper, Inken Suck, James Taylor, Daphne Cuvelier, Lidia Lins, Erik Simon-Lledó, Yann Marcon, Daniel O. B. Jones, Tim Nattkemper, Kevin Köser, Martin Zurowietz, Jens Greinert, and Jose Gomes-Pereira
Biogeosciences, 17, 3115–3133, https://doi.org/10.5194/bg-17-3115-2020, https://doi.org/10.5194/bg-17-3115-2020, 2020
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Seafloor imaging is widely used in marine science and industry to explore and monitor areas of interest. The selection of the most appropriate imaging gear and deployment strategy depends on the target application. This paper compares imaging platforms like autonomous vehicles or towed camera frames and different deployment strategies of those in assessing the megafauna abundance of polymetallic-nodule fields. The deep-sea mining industry needs that information for robust impact monitoring.
Florian Gausepohl, Anne Hennke, Timm Schoening, Kevin Köser, and Jens Greinert
Biogeosciences, 17, 1463–1493, https://doi.org/10.5194/bg-17-1463-2020, https://doi.org/10.5194/bg-17-1463-2020, 2020
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In the course of former German environmental impact studies associated with manganese-nodule mining, the DISCOL experiment was conducted in 1989 in the Peru Basin. The disturbance tracks created by a plough harrow in the area are still apparent and could be located by high-resolution mapping techniques. The analysis presented in this study reveals the age sequence and the temporal change of the tracks which facilitates more detailed sample interpretations within the area.
Mariem Saavedra-Pellitero, Karl-Heinz Baumann, Miguel Ángel Fuertes, Hartmut Schulz, Yann Marcon, Nele Manon Vollmar, José-Abel Flores, and Frank Lamy
Biogeosciences, 16, 3679–3702, https://doi.org/10.5194/bg-16-3679-2019, https://doi.org/10.5194/bg-16-3679-2019, 2019
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Open ocean phytoplankton include coccolithophore algae, a key element in carbon cycle regulation with important feedbacks to the climate system. We document latitudinal variability in both coccolithophore assemblage and the mass variation in one particular species, Emiliania huxleyi, for a transect across the Drake Passage (in the Southern Ocean). Coccolithophore abundance, diversity and maximum depth habitat decrease southwards, coinciding with changes in the predominant E. huxleyi morphotypes.
Iason-Zois Gazis, Timm Schoening, Evangelos Alevizos, and Jens Greinert
Biogeosciences, 15, 7347–7377, https://doi.org/10.5194/bg-15-7347-2018, https://doi.org/10.5194/bg-15-7347-2018, 2018
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The use of high-resolution hydroacoustic and optic data acquired by an autonomous underwater vehicle can give us detailed sea bottom topography and valuable information regarding manganese nodules' spatial distribution. Moreover, the combined use of these data sets with a random forest machine learning model can extend this spatial prediction beyond the areas with available photos, providing researchers with a new mapping tool for further investigation and links with other data.
Tanja Stratmann, Lidia Lins, Autun Purser, Yann Marcon, Clara F. Rodrigues, Ascensão Ravara, Marina R. Cunha, Erik Simon-Lledó, Daniel O. B. Jones, Andrew K. Sweetman, Kevin Köser, and Dick van Oevelen
Biogeosciences, 15, 4131–4145, https://doi.org/10.5194/bg-15-4131-2018, https://doi.org/10.5194/bg-15-4131-2018, 2018
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Extraction of polymetallic nodules will have negative impacts on the deep-sea ecosystem, but it is not known whether the ecosystem is able to recover from them. Therefore, in 1989 a sediment disturbance experiment was conducted in the Peru Basin to mimic deep-sea mining. Subsequently, the experimental site was re-visited 5 times to monitor the recovery of fauna. We developed food-web models for all 5 time steps and found that, even after 26 years, carbon flow in the system differs significantly.
Anne Peukert, Timm Schoening, Evangelos Alevizos, Kevin Köser, Tom Kwasnitschka, and Jens Greinert
Biogeosciences, 15, 2525–2549, https://doi.org/10.5194/bg-15-2525-2018, https://doi.org/10.5194/bg-15-2525-2018, 2018
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Manganese nodules are a deep-sea mineral resource considered for mining. This paper provides insights into measuring the distribution of manganese nodules at meter resolution. Nodule abundance was determined by autonomous robots using cameras and echo sounders. Based on the meter-scale abundance measurements, environmental impacts of simulated deep-sea mining were assessed. The spatial extent of a sediment plume was determined and showed correlation to small variations in seafloor topography.
Evangelos Alevizos, Timm Schoening, Kevin Koeser, Mirjam Snellen, and Jens Greinert
Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-60, https://doi.org/10.5194/bg-2018-60, 2018
Revised manuscript has not been submitted
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AUV hydro-acoustic and optical data enhance high resolution quantitative mapping of deep sea hard substrates such Mn-nodules. Machine learning algorithms predict with good accuracy the Mn-nodules abundances over large scale areas utilizing one third of ground truth optical data. Accurate maps of Mn-nodule abundances raise new questions about the role of fine scale geomorphology in nodule formation, provide new insights in deep sea ecological studies, and improve mineral assessment estimations.
Heiko Sahling, Christian Borowski, Elva Escobar-Briones, Adriana Gaytán-Caballero, Chieh-Wei Hsu, Markus Loher, Ian MacDonald, Yann Marcon, Thomas Pape, Miriam Römer, Maxim Rubin-Blum, Florence Schubotz, Daniel Smrzka, Gunter Wegener, and Gerhard Bohrmann
Biogeosciences, 13, 4491–4512, https://doi.org/10.5194/bg-13-4491-2016, https://doi.org/10.5194/bg-13-4491-2016, 2016
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We were excited about nature’s diversity when we discovered spectacular flows of heavy oil at the seafloor with the remotely operated vehicle QUEST 4000 m in Campeche Bay, southern Gulf of Mexico. Vigorous methane gas bubble emissions lead to massive gas hydrate deposits at water depth as deep as 3420 m. The hydrates formed metre-sized mounds at the seafloor that were densely overgrown by vestimentiferan tubeworms and other seep-typical organisms.
Y. Marcon, H. Sahling, and G. Bohrmann
Geosci. Instrum. Method. Data Syst., 2, 189–198, https://doi.org/10.5194/gi-2-189-2013, https://doi.org/10.5194/gi-2-189-2013, 2013
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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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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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Thibauld M. Béjard, Andrés S. Rigual-Hernández, Javier P. Tarruella, José A. Flores, Anna Sanchez Vidal, Irene Llamas Cano, and Francisco J. Sierro
EGUsphere, https://doi.org/10.5194/egusphere-2023-3101, https://doi.org/10.5194/egusphere-2023-3101, 2024
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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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Silvan Urs Goldenberg, Ulf Riebesell, Daniel Brüggemann, Gregor Börner, Michael Sswat, Arild Folkvord, Maria Couret, Synne Spjelkavik, Nicolás Sánchez, Cornelia Jaspers, and Marta Moyano
EGUsphere, https://doi.org/10.5194/egusphere-2024-286, https://doi.org/10.5194/egusphere-2024-286, 2024
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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.
France Van Wambeke, Elvira Pulido, Philippe Catala, Julie Dinasquet, Kahina Djaoudi, Anja Engel, Marc Garel, Sophie Guasco, Barbara Marie, Sandra Nunige, Vincent Taillandier, Birthe Zäncker, and Christian Tamburini
Biogeosciences, 18, 2301–2323, https://doi.org/10.5194/bg-18-2301-2021, https://doi.org/10.5194/bg-18-2301-2021, 2021
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Michaelis–Menten kinetics were determined for alkaline phosphatase, aminopeptidase and β-glucosidase in the Mediterranean Sea. Although the ectoenzymatic-hydrolysis contribution to heterotrophic prokaryotic needs was high in terms of N, it was low in terms of C. This study points out the biases in interpretation of the relative differences in activities among the three tested enzymes in regard to the choice of added concentrations of fluorogenic substrates.
Oscar E. Romero, Simon Ramondenc, and Gerhard Fischer
Biogeosciences, 18, 1873–1891, https://doi.org/10.5194/bg-18-1873-2021, https://doi.org/10.5194/bg-18-1873-2021, 2021
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Upwelling intensity along NW Africa varies on the interannual to decadal timescale. Understanding its changes is key for the prediction of future changes of CO2 sequestration in the northeastern Atlantic. Based on a multiyear (1988–2009) sediment trap experiment at the site CBmeso, fluxes and the species composition of the diatom assemblage are presented. Our data help in establishing the scientific basis for forecasting and modeling future states of this ecosystem and its decadal changes.
Katharine T. Bigham, Ashley A. Rowden, Daniel Leduc, and David A. Bowden
Biogeosciences, 18, 1893–1908, https://doi.org/10.5194/bg-18-1893-2021, https://doi.org/10.5194/bg-18-1893-2021, 2021
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Turbidity flows – underwater avalanches – are large-scale physical disturbances believed to have profound impacts on productivity and diversity of benthic communities in the deep sea. We reviewed published studies and found that current evidence for changes in productivity is ambiguous at best, but the influence on regional and local diversity is clearer. We suggest study design criteria that may lead to a better understanding of large-scale disturbance effects on deep-sea benthos.
Phillip Williamson, Hans-Otto Pörtner, Steve Widdicombe, and Jean-Pierre Gattuso
Biogeosciences, 18, 1787–1792, https://doi.org/10.5194/bg-18-1787-2021, https://doi.org/10.5194/bg-18-1787-2021, 2021
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The reliability of ocean acidification research was challenged in early 2020 when a high-profile paper failed to corroborate previously observed impacts of high CO2 on the behaviour of coral reef fish. We now know the reason why: the
replicatedstudies differed in many ways. Open-minded and collaborative assessment of all research results, both negative and positive, remains the best way to develop process-based understanding of the impacts of ocean acidification on marine organisms.
Michael Lintner, Bianca Lintner, Wolfgang Wanek, Nina Keul, and Petra Heinz
Biogeosciences, 18, 1395–1406, https://doi.org/10.5194/bg-18-1395-2021, https://doi.org/10.5194/bg-18-1395-2021, 2021
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Foraminifera are unicellular marine organisms that play an important role in the marine element cycle. Changes of environmental parameters such as salinity or temperature have a significant impact on the faunal assemblages. Our experiments show that changes in salinity immediately influence the foraminiferal activity. Also the light regime has a significant impact on carbon or nitrogen processing in foraminifera which contain no kleptoplasts.
Michele Casini, Martin Hansson, Alessandro Orio, and Karin Limburg
Biogeosciences, 18, 1321–1331, https://doi.org/10.5194/bg-18-1321-2021, https://doi.org/10.5194/bg-18-1321-2021, 2021
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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.
Elizabeth D. LaBone, Kenneth A. Rose, Dubravko Justic, Haosheng Huang, and Lixia Wang
Biogeosciences, 18, 487–507, https://doi.org/10.5194/bg-18-487-2021, https://doi.org/10.5194/bg-18-487-2021, 2021
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The hypoxic zone is an area of low dissolved oxygen (DO) in the Gulf of Mexico. Fish can be killed by exposure to hypoxia and can be negatively impacted by exposure to low, nonlethal DO concentrations (sublethal DO). We found that high sublethal area resulted in higher exposure and DO variability had a small effect on exposure. There was a large variation in exposure among individuals, which when combined with spatial variability of DO, can result in an underestimation of exposure when averaged.
Svenja Reents, Peter Mueller, Hao Tang, Kai Jensen, and Stefanie Nolte
Biogeosciences, 18, 403–411, https://doi.org/10.5194/bg-18-403-2021, https://doi.org/10.5194/bg-18-403-2021, 2021
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By conducting a flooding experiment with two genotypes of the salt-marsh grass Elymus athericus, we show considerable differences in biomass response to flooding within the same species. As biomass production plays a major role in sedimentation processes and thereby salt-marsh accretion, we emphasise the importance of taking intraspecific differences into account when evaluating ecosystem resilience to accelerated sea level rise.
Cited articles
Amon, D., Ziegler, A. F., Drazen, J. C., Grisschenko, A. V., Leitner, A.
B., Lindsay, D. J., Wicksten, M. K., Voight, J. R., Young, C. M., and Smith,
C. R.: Megafauna of the UKSRL exploration contract area and eastern
Clarion-Clipperton Zone in the Pacific Ocean: Annelida, Arthropoda, Bryozoa,
Chordata, Ctenophora, Mollusca, Biodiversity Data Journal, 5, e14598
https://doi.org/10.3897/BDJ.5.e14598, 2017.
Amon, D. J., Ziegler, A. F., Dahlgren, T. G., Glover, A. G., Goineau, A.,
Gooday, A. J., Wiklund, H., and Smith, C. R.: Insights into the abundance
and diversity of abyssal megafauna in a polymetallic-nodule region in the
eastern Clarion-Clipperton Zone, Sci. Rep.-UK, 6, 30492,
https://doi.org/10.1038/srep30492, 2016.
Anderson, M. E. and Bluhm, H.: Description of a new species of Pachycara
Zugmayer, 1911 from the abyssal south-eastern Pacific and redescription of
P. thermophilum Geistdoerfer, 1994, with a new key to the species,
T. Roy. Soc. S. Afr., 51, 219–227, 1997.
Bailey, D. M., King, N. J., and Priede, I. G.: Cameras and carcasses:
historical and current methods for using artificial food falls to study
deep-water animals, Mar. Ecol.-Prog. Ser., 350, 179–191, 2007.
Bluhm, H.: Monitoring megabenthic communities in abyssal manganese nodule
sites of the East Pacific Ocean in association with commercial deep-sea
mining, Aquat. Conserv., 4, 187–201, https://doi.org/10.1002/aqc.3270040302, 1994.
Bluhm, H.: Re-establishment of an abyssal megabenthic community after
experimental physical disturbance of the seafloor, Deep-Sea Res. Pt.
II, 48, 3841–3868, https://doi.org/10.1016/S0967-0645(01)00070-4, 2001.
Bluhm, H., Schriever, G., and Thiel, H.: Megabenthic recolonization in an
experimentally disturbed abyssal manganese nodule area, Mar. Georesour. Geotec., 13, 393–416, https://doi.org/10.1080/10641199509388295, 1995.
Bonito, L. T., Hamdoun, A., and Sandin, S. A.: Evaluation of the global
impacts of mitigation on persistent, bioaccumulative and toxic pollutants in
marine fish, PeerJ, 4, e1573, https://doi.org/10.7717/peerj.1573, 2016.
Borowski, C.: Physically disturbed deep-sea macrofauna in the Peru Basin,
southeast Pacific, revisited 7 years after the experimental impact, Deep-Sea
Res. Pt. II, 48, 3809–3839, https://doi.org/10.1016/S0967-0645(01)00069-8, 2001.
Brandt, A., Malyutina, M., Borowski, C., Schriever, G., and Thiel, H.:
Munnopsidid isopod attracted to bait in the DISCOL area, Pacific Ocean,
Mitt. hamb. Zool. Mus. Inst., 101, 275–279, 2004.
Chouvelon, T., Spitz, J., Caurant, F., Mendez-Fernandez, P., Autier, J.,
Lassus-Debat, A., Chappuis, A., and Bustamante, P.: Enhanced bioaccumulation
of mercury in deep-sea fauna from the Bay of Biscay (north-east Atlantic) in
relation to trophic positions identified by analysis of carbon and nitrogen
stable isotopes, Deep-Sea Res. Pt. 1, 65, 113–124, 2012.
Choy, C. A., Popp, B. N., Kaneko, J. J., and Drazen, J. C.: The influence of
depth on mercury levels in pelagic fishes and their prey, P. Natl. Acad.
Sci. USA, 106, 13865–13869, 2009.
Colton, M. A. and Swearer, S. E.: A comparison of two survey methods:
differences between underwater visual census and baited remote underwater
video, Mar. Ecol.-Prog. Ser., 400, 19–36, https://doi.org/10.3354/meps08377, 2010.
Crabtree, R. E., Carter, J., and Musick, J. A.: The comparative feeding
ecology of temperate and tropical deep-sea fishes from the western North
Atlantic, Deep Sea Res., 38, 1277–1298, 1991.
Doya, C., Chatzievangelou, D., Bahamon, N., Purser, A., De Leo, F. C.,
Juniper, S. K., Thomsen, L., and Aguzzi, J.: Seasonal monitoring of deep-sea
megabenthos in Barkley Canyon cold seep by internet operated vehicle (IOV),
PLOS ONE, 12, e0176917, https://doi.org/10.1371/journal.pone.0176917, 2017.
Drazen, J. C. and Sutton, T. T.: Dining in the deep: The feeding ecology of
deep-sea fishes, Annu. Rev. Mar. Sci., 9, 337–366,
https://doi.org/10.1146/annurev-marine-010816-060543, 2017.
Estes, J. A., Terborgh, J., Brashares, J. S., Power, M. E., Berger, J.,
Bond, W. J., Carpenter, S. R., Essington, T. E., Holt, R. D., Jackson, J. B.
C., Marquis, R. J., Oksanen, L., Oksanen, T., Paine, R. T., Pikitch, E. K.,
Ripple, W. J., Sandin, S. A., Scheffer, M., Schoener, T. W., Shurin, J. B.,
Sinclair, A. R. E., Soulé, M. E., Virtanen, R., and Wardle, D. A.:
Trophic downgrading of planet Earth, Science, 333, 301–306,
https://doi.org/10.1126/science.1205106, 2011.
Fleury, A. G. and Drazen, J. C.: Abyssal scavenging communities attracted
to sargassum and fish in the Sargasso sea, Deep-Sea Res. Pt. I, 72, 141–147,
https://doi.org/10.1016/j.dsr.2012.11.004, 2013.
Foell, E. J., Schriever, G., Bluhm, H., Borowski, C., Bussau, C., and Thiel, H.: Disturbance and Recolonization Experiment in the Abyssal South Pacific Ocean (DISCOL): An Update, 24th annual Offshore Technology Conference, Houston, Texas, 6805, 25–34, https://doi.org/10.4043/6805-MS, 1992.
Gollner, S., Kaiser, S., Menzel, L., Jones, D. O. B., Brown, A., Mestre, N.
C., van Oevelen, D., Menot, L., Colaço, A., Canals, M., Cuvelier, D.,
Durden, J. M., Gebruk, A., Egho, G. A., Haeckel, M., Marcon, Y., Mevenkamp,
L., Morato, T., Pham, C. K., Purser, A., Sanchez-Vidal, A., Vanreusel, A.,
Vink, A., and Martinez Arbizu, P.: Resilience of benthic deep-sea fauna to
mining activities, Mar. Environ. Res., 129, 76–101, https://doi.org/10.1016/j.marenvres.2017.04.010, 2017.
Jones, D. O. B., Kaiser, S., Sweetman, A. K., Smith, C. R., Menot, L., Vink,
A., Trueblood, D., Greinert, J., Billett, D. S. M., Arbizu, P. M.,
Radziejewska, T., Singh, R., Ingole, B., Stratmann, T., Simon-Lledó, E.,
Durden, J. M., and Clark, M. R.: Biological responses to disturbance from
simulated deep-sea polymetallic nodule mining, PLOS ONE, 12, e0171750,
https://doi.org/10.1371/journal.pone.0171750, 2017.
Jones, D. O. B., Amon, D. J., and Chapman, A. S. A.: Mining deep-ocean
mineral deposits: What are the ecological risks?, Elements, 14, 325–330,
https://doi.org/10.2138/gselements.14.5.325, 2018.
Kuhnz, L. A., Ruhl, H. A., Huffard, C. A., and Smith, K. L.: Rapid changes
and long-term cycles in the benthic megafaunal community observed over 24
years in the abyssal northeast Pacific, Prog. Oceanogr., 543, 1–11, 2014.
Leitner, A. B., Neuheimer, A. B., Donlon, E., Smith, C. R., and Drazen, J.
C.: Environmental and bathymetric influences on abyssal bait-attending
communities of the Clarion Clipperton Zone, Deep-Sea Res. Pt. I, 125, 65–80,
https://doi.org/10.1016/j.dsr.2017.04.017, 2017.
Levin, L. A., Mengerink, K., Gjerde, K. M., Rowden, A. A., Van Dover, C. L.,
Clark, M. R., Ramirez-Llodra, E., Currie, B., Smith, C. R., Sato, K. N.,
Gallo, N., Sweetman, A. K., Lily, H., Armstrong, C. W., and Brider, J.:
Defining “serious harm” to the marine environment in the context of
deep-seabed mining, Mar. Policy, 74, 245–259, https://doi.org/10.1016/j.marpol.2016.09.032, 2016.
Linley, T. D., Gerringer, M. E., Yancey, P. H., Drazen, J. C., Weinstock, C.
L., and Jamieson, A. J.: Fishes of the hadal zone including new species, in
situ observations and depth records of hadal snailfishes Deep-Sea Res. Pt. I,
114, 99–110, https://doi.org/10.1016/j.dsr.2016.05.003, 2016.
Linley, T. D., Stewart, A., McMillan, P., Clark, M., Gerringer, M., Drazen,
J. C., Fujii, T., and Jamieson, A. J.: Bait attending fishes of the abyssal
zone and hadal boundary: community structure, functional groups and species
distribution in the Kermadec, New Hebrides and Mariana trenches, Deep-Sea
Res. Pt. I, 121, 38–53, 2017.
Marcon, Y. and Purser, A.: PAPARA(ZZ)I: An open-source software interface
for annotating photographs of the deep-sea, SoftwareX, 6, 69–80, https://doi.org/10.1016/j.softx.2017.02.002, 2017.
Miljutin, D. M., Miljutin, M. A., Arbizu, P. M., and Galeron, J.: Deep-sea
nematode assemblage has not recovered 26 years after experimental mining of
polymetallic nodules (Clarion-Clipperton Fracture Zone, Tropical Eastern
Pacific), Deep-Sea Res. Pt. I, 58, 885–897, https://doi.org/10.1016/j.dsr.2011.06.003, 2011.
Milligan, R. J., Morris, K. J., Bett, B. J., Durden, J. M., Jones, D. O. B.,
Robert, K., Ruhl, H. A., and Bailey, D. M.: High resolution study of the
spatial distributions of abyssal fishes by autonomous underwater vehicle,
Sci. Rep.-UK, 6, 26095, https://doi.org/10.1038/srep26095,
2016.
Nielsen, J. G.: Synopsis of the Ipnopidae (Pisces, Iniomi): with a
description of two new abyssal species, Galathea Report, 8, 49–75, 1966.
Nielsen, J. G. and Merrett, N. R.: Revision of the cosmopolitan deep-sea
genus Bassozetus (Pisces: Ophidiidae) with two new species, Galathea Report,
18, 7–56, 2000.
Oebius, H. U., Becker, H. J., Rolinski, S., and Jankowski, J. A.:
Parametrization and evaluation of marine environmental impacts produced by
deep-sea manganese nodule mining, Deep-Sea Res. Pt. II, 48, 3453–3467, https://doi.org/10.1016/S0967-0645(01)00052-2, 2001.
Pawson, D. L. and Foell, E. J.: Atlas of Photographs of Megafauna from the
Study Area. Report No. MS-200-146 of Deepsea Ventures Inc., Gloucester
Point, Virginia, 120 pp., 1983.
Priede, I. G.: Deep-Sea Fishes: Biology, Diversity, Ecology and Fisheries,
Cambridge University Press, Cambridge, 2017.
Priede, I. G. and Merrett, N. R.: The relationship between numbers of fish
attracted to baited cameras and population density: Studies on demersal
grenadiers Coryphaenoides (Nematonurus) armatus in the abyssal NE Atlantic Ocean, Fish. Res., 36, 133–137,
1998.
Purser, A., Marcon, Y., Hoving, H.-J. T., Vecchione, M., Piatkowski, U.,
Eason, D., Bluhm, H., and Boetius, A.: Association of deep-sea incirrate
octopods with manganese crusts and nodule fields in the Pacific Ocean,
Curr. Biol., 26, R1268–R1269, https://doi.org/10.1016/j.cub.2016.10.052, 2017.
Purser, A., Marcon, Y., Dreutter, S., Hoge, U., Sablotny, B., Hehemann, L.,
Lemburg, J., Dorschel, B., Biebow, H., and Boetius, A.: Ocean Floor
Observation and Bathymetry System (OFOBS): A new Towed Camera/Sonar System
for Deep-Sea Habitat Surveys, IEEE J. Oceanic Eng., 44, 1–13,
https://doi.org/10.1109/JOE.2018.2794095, 2018a.
Purser, A., Marcon, Y., and Boetius, A.: Seafloor images from the Peru Basin Disturbance and Colonization (DISCOL) area collected during SO242/2, Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, PANGAEA, https://doi.org/10.1594/PANGAEA.890634, 2018b.
Purser, A., Langenkämper, D., Schoening, T., Suck, I., Taylor, J., Cuvelier, D., Lins, L., Simon-Lledo, E., Marcon, Y., Jones, D., Nattkemper, T., Koeser, K., Zurowietz, M., and Nuno Pereira, J.: Polymetallic nodule megafauna community assessment: Platform and methodology comparison, Biogeosciences Discuss., in preparation, 2019.
Radziejewska, T. and Stoyanova, S.: Abyssal epibenthic megafauna of the
Clarion-Clipperton area (NE Pacific): Changes in time and space versus
anthropogenic environmental disturbance, Oceanological Studies, 29, 83–101,
2000.
Ramirez-Llodra, E., Tyler, P. A., Baker, M. C., Bergstad, O. A., Clark, M.
R., Escobar, E., Levin, L. A., Menot, L., Rowden, A. A., Smith, C. R., and
Van Dover, C. L.: Man and the last great wilderness: Human impact on the
deep sea, PLoS ONE, 6, e22588, https://doi.org/10.1371/journal.pone.0022588, 2011.
Rolinski, S., Segschneider, J., and Sündermann, J.: Long-term
propagation of tailings from deep-sea mining under variable conditions by
means of numerical simulations, Deep-Sea Res. Pt. II, 48, 3469–3485, https://doi.org/10.1016/S0967-0645(01)00053-4, 2001.
Ruhl, H. A. and Smith Jr., K. L.: Shifts in deep-sea community structure
linked to climate and food supply, Science, 305, 513–515, 2004.
Stratmann, T., Voorsmit, I., Gebruk, A., Brown, A., Purser, A., Marcon, Y.,
Sweetman, A. K., Jones, D. O. B., and van Oevelen, D.: Recovery of
Holothuroidea population density, community composition, and respiration
activity after a deep-sea disturbance experiment, Limnol. Oceanogr., 63,
2140–2153, https://doi.org/10.1002/lno.10929, 2018.
Thiel, H., Schriever, G., Ahnert, A., Bluhm, H., Borowski, C., and Vopel,
K.: The large-scale environmental impact experiment DISCOL – reflection and
foresight, Deep-Sea Res. Pt. II, 48,
3869–3882, https://doi.org/10.1016/S0967-0645(01)00071-6,
2001.
Tilot, V.: Biodiversity and distribution of megafauna. Vol. 1: The
polymetallic nodule ecosystem of the Eastern Equatorial Pacific Ocean; Vol.
2: Annotated photographic atlas of the echinoderms of the Clarion-Clipperton
fracture zone, UNESCO IOC Technical Series69, 147 pp., 2006.
Trenkel, V. M., Lorance, P., and Mahevas, S.: Do visual transects provide
true population density estimates for deepwater fish?, ICES J. Mar. Sci.,
61, 1050–1056, 2004.
Vanreusel, A., Hilario, A., Ribeiro, P. A., Menot, L., and Arbizu, P. M.:
Threatened by mining, polymetallic nodules are required to preserve abyssal
epifauna, Sci. Rep.-UK, 6, 26808, https://doi.org/10.1038/srep26808, 2016.
Watling, L., Guinotte, J., Clark, M. R., and Smith, C. R.: A proposed
biogeography of the deep ocean floor, Prog. Oceanogr., 111, 91–112,
https://doi.org/10.1016/j.pocean.2012.11.003, 2013.
Wedding, L. M., Friedlander, A. M., Kittinger, J. N., Watling, L., Gaines,
S. D., Bennett, M., Hardy, S. M., and Smith, C. R.: From principles to
practice: a spatial approach to systematic conservation planning in the deep
sea, P. Roy. Soc. B-Biol., 280, 20131684,
https://doi.org/10.1098/rspb.2013.1684, 2013.
Wedding, L. M., Reiter, S. M., Smith, C. R., Gjerde, K. M., Kittinger, J.
N., Friedlander, A. M., Gaines, S. D., Clark, M. R., Thurnherr, A. M.,
Hardy, S. M., and Crowder, L. B.: Managing mining of the deep seabed,
Science, 349, 144–145, https://doi.org/10.1126/science.aac6647, 2015.
Yeh, J. and Drazen, J. C.: Depth zonation and bathymetric trends of
deep-sea megafaunal scavengers of the Hawaiian Islands, Deep-Sea Res. Pt. I, 56,
251–266, 2009.
Yeh, J. and Drazen, J. C.: Baited-camera observations of deep-sea
megafaunal scavenger ecology on the California slope, Mar. Ecol.-Prog. Ser.,
424, 145–156, 2011.
Short summary
We investigated the fish and scavenger community after a deep seafloor disturbance experiment intended to simulate the effects of deep-sea mining. Fish density returned to background levels after several years; however the dominant fish was rarely found in ploughed habitat after 26 years. Given the significantly larger scale of industrial mining, these results could translate to population-level effects. The abyssal fish community at the site was similar to that in the Clarion–Clipperton Zone.
We investigated the fish and scavenger community after a deep seafloor disturbance experiment...
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