Articles | Volume 17, issue 12
https://doi.org/10.5194/bg-17-3115-2020
© Author(s) 2020. 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-17-3115-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
19 Jun 2020
Research article |
| 19 Jun 2020
Megafauna community assessment of polymetallic-nodule fields with cameras: platform and methodology comparison
GEOMAR Helmholtz Centre for Ocean Research, Kiel, Germany
Autun Purser
Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany
Daniel Langenkämper
Biodata Mining Group, Bielefeld University, Bielefeld, Germany
Inken Suck
GEOMAR Helmholtz Centre for Ocean Research, Kiel, Germany
James Taylor
Senckenberg am Meer, Wilhelmshaven, Germany
Daphne Cuvelier
MARE – Marine and Environmental Sciences Centre, IMAR – Instituto do Mar, Horta, Portugal
Centro OKEANOS, Universidade dos Açores, Horta, Portugal
Lidia Lins
Department of Biology, Ghent University, Ghent, Belgium
Erik Simon-Lledó
National Oceanography Centre, Southampton, UK
Yann Marcon
University of Bremen, MARUM Center for Marine Environmental Sciences, Bremen, Germany
Department of Geosciences, University of Bremen, Bremen, Germany
Daniel O. B. Jones
National Oceanography Centre, Southampton, UK
Tim Nattkemper
Biodata Mining Group, Bielefeld University, Bielefeld, Germany
Kevin Köser
GEOMAR Helmholtz Centre for Ocean Research, Kiel, Germany
Martin Zurowietz
Biodata Mining Group, Bielefeld University, Bielefeld, Germany
Jens Greinert
GEOMAR Helmholtz Centre for Ocean Research, Kiel, Germany
Jose Gomes-Pereira
Naturalist, Lda., Atlantic Naturalist Association, Horta, Portugal
Centro OKEANOS, Universidade dos Açores, Horta, Portugal
Related authors
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
Short summary
Short summary
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.
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
Short summary
Short summary
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.
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
Short summary
Short summary
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
Short summary
Short summary
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.
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
Short summary
Short summary
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
Short summary
Short summary
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
Short summary
Short summary
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.
T. Möller, D. Brün, D. Langenkämper, R. van Kevelaer, and T. W. Nattkemper
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLIII-B2-2020, 1121–1127, https://doi.org/10.5194/isprs-archives-XLIII-B2-2020-1121-2020, https://doi.org/10.5194/isprs-archives-XLIII-B2-2020-1121-2020, 2020
D. Langenkämper, R. van Kevelaer, T. Möller, and T. W. Nattkemper
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLIII-B1-2020, 465–469, https://doi.org/10.5194/isprs-archives-XLIII-B1-2020-465-2020, https://doi.org/10.5194/isprs-archives-XLIII-B1-2020-465-2020, 2020
Daphne Cuvelier, Pedro A. Ribeiro, Sofia P. Ramalho, Daniel Kersken, Pedro Martinez Arbizu, and Ana Colaço
Biogeosciences, 17, 2657–2680, https://doi.org/10.5194/bg-17-2657-2020, https://doi.org/10.5194/bg-17-2657-2020, 2020
Short summary
Short summary
Polymetallic nodule mining will remove hard substrata from the abyssal deep-sea floor. The only neighbouring ecosystems featuring hard substratum are seamounts, and their inhabiting fauna could aid in recovery post-mining. Nevertheless, first observations of seamount megafauna were very different from nodule-associated megafauna and showed little overlap. The possible uniqueness of these ecosystems implies that they should be included in management plans for the conservation of biodiversity.
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
Short summary
Short summary
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
Short summary
Short summary
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.
Jeffrey C. Drazen, Astrid B. Leitner, Sage Morningstar, Yann Marcon, Jens Greinert, and Autun Purser
Biogeosciences, 16, 3133–3146, https://doi.org/10.5194/bg-16-3133-2019, https://doi.org/10.5194/bg-16-3133-2019, 2019
Short summary
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.
Y. Song, K. Köser, T. Kwasnitschka, and R. Koch
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLII-2-W10, 181–187, https://doi.org/10.5194/isprs-archives-XLII-2-W10-181-2019, https://doi.org/10.5194/isprs-archives-XLII-2-W10-181-2019, 2019
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
Short summary
Short summary
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
Short summary
Short summary
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
Short summary
Short summary
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
Short summary
Short summary
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.
Daphne Cuvelier, Pierre Legendre, Agathe Laës-Huon, Pierre-Marie Sarradin, and Jozée Sarrazin
Biogeosciences, 14, 2955–2977, https://doi.org/10.5194/bg-14-2955-2017, https://doi.org/10.5194/bg-14-2955-2017, 2017
Lidia Lins, Frederik Leliaert, Torben Riehl, Sofia Pinto Ramalho, Eliana Alfaro Cordova, André Morgado Esteves, and Ann Vanreusel
Biogeosciences, 14, 651–669, https://doi.org/10.5194/bg-14-651-2017, https://doi.org/10.5194/bg-14-651-2017, 2017
Short summary
Short summary
Anthropogenic impacts in the deep sea are regarded as high disturbers of the deep-sea bottom. This study focus in trying to understand the impact of disturbance in the ecosystem and how important functions, such as hydrodynamics and surface primary productivity, affect benthic organisms. Our results showed that high sediment variability due to hydrodynamics, and consequently disturbance, combined with high resource availability are probably the main factors promoting deep-sea species coexistence
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
Short summary
Short summary
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.
M. Gehlen, R. Séférian, D. O. B. Jones, T. Roy, R. Roth, J. Barry, L. Bopp, S. C. Doney, J. P. Dunne, C. Heinze, F. Joos, J. C. Orr, L. Resplandy, J. Segschneider, and J. Tjiputra
Biogeosciences, 11, 6955–6967, https://doi.org/10.5194/bg-11-6955-2014, https://doi.org/10.5194/bg-11-6955-2014, 2014
Short summary
Short summary
This study evaluates potential impacts of pH reductions on North Atlantic deep-sea ecosystems in response to latest IPCC scenarios.Multi-model projections of pH changes over the seafloor are analysed with reference to a critical threshold based on palaeo-oceanographic studies, contemporary observations and model results. By 2100 under the most severe IPCC CO2 scenario, pH reductions occur over ~23% of deep-sea canyons and ~8% of seamounts – including seamounts proposed as marine protected areas.
A. R. Thurber, A. K. Sweetman, B. E. Narayanaswamy, D. O. B. Jones, J. Ingels, and R. L. Hansman
Biogeosciences, 11, 3941–3963, https://doi.org/10.5194/bg-11-3941-2014, https://doi.org/10.5194/bg-11-3941-2014, 2014
A. Purser, J. Ontrup, T. Schoening, L. Thomsen, R. Tong, V. Unnithan, and T. W. Nattkemper
Biogeosciences, 10, 5779–5791, https://doi.org/10.5194/bg-10-5779-2013, https://doi.org/10.5194/bg-10-5779-2013, 2013
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
E. Pape, T. N. Bezerra, D. O. B. Jones, and A. Vanreusel
Biogeosciences, 10, 3127–3143, https://doi.org/10.5194/bg-10-3127-2013, https://doi.org/10.5194/bg-10-3127-2013, 2013
Related subject area
Biodiversity and Ecosystem Function: Marine
Ecological divergence of a mesocosm in an eastern boundary upwelling system assessed with multi-marker environmental DNA metabarcoding
Unique benthic foraminiferal communities (stained) in diverse environments of sub-Antarctic fjords, South Georgia
Upwelled plankton community modulates surface bloom succession and nutrient availability in a natural plankton assemblage
First phytoplankton community assessment of the Kong Håkon VII Hav, Southern Ocean, during austral autumn
Early life stages of a Mediterranean coral are vulnerable to ocean warming and acidification
Mediterranean seagrasses as carbon sinks: methodological and regional differences
Contrasting vertical distributions of recent planktic foraminifera off Indonesia during the southeast monsoon: implications for paleoceanographic reconstructions
The onset of the spring phytoplankton bloom in the coastal North Sea supports the Disturbance Recovery Hypothesis
Species richness and functional attributes of fish assemblages across a large-scale salinity gradient in shallow coastal areas
Modeling the growth and sporulation dynamics of the macroalga Ulva in mixed-age populations in cultivation and the formation of green tides
Spatial changes in community composition and food web structure of mesozooplankton across the Adriatic basin (Mediterranean Sea)
Predicting mangrove forest dynamics across a soil salinity gradient using an individual-based vegetation model linked with plant hydraulics
Will daytime community calcification reflect reef accretion on future, degraded coral reefs?
Modeling polar marine ecosystem functions guided by bacterial physiological and taxonomic traits
Quantifying functional consequences of habitat degradation on a Caribbean coral reef
Enhanced chlorophyll-a concentration in the wake of Sable Island, eastern Canada, revealed by two decades of satellite observations: a response to grey seal population dynamics?
Population dynamics and reproduction strategies of planktonic foraminifera in the open ocean
The Bouraké semi-enclosed lagoon (New Caledonia) – a natural laboratory to study the lifelong adaptation of a coral reef ecosystem to extreme environmental conditions
Atypical, high-diversity assemblages of foraminifera in a mangrove estuary in northern Brazil
Permanent ectoplasmic structures in deep-sea Cibicides and Cibicidoides taxa – long-term observations at in situ pressure
Ideas and perspectives: Ushering the Indian Ocean into the UN Decade of Ocean Science for Sustainable Development (UNDOSSD) through marine ecosystem research and operational services – an early career's take
Persistent effects of sand extraction on habitats and associated benthic communities in the German Bight
Spatial patterns of ectoenzymatic kinetics in relation to biogeochemical properties in the Mediterranean Sea and the concentration of the fluorogenic substrate used
A 2-decade (1988–2009) record of diatom fluxes in the Mauritanian coastal upwelling: impact of low-frequency forcing and a two-step shift in the species composition
Review and syntheses: Impacts of turbidity flows on deep-sea benthic communities
Ideas and perspectives: When ocean acidification experiments are not the same, repeatability is not tested
The effect of the salinity, light regime and food source on carbon and nitrogen uptake in a benthic foraminifer
Changes in population depth distribution and oxygen stratification are involved in the current low condition of the eastern Baltic Sea cod (Gadus morhua)
Effects of spatial variability on the exposure of fish to hypoxia: a modeling analysis for the Gulf of Mexico
Plant genotype determines biomass response to flooding frequency in tidal wetlands
Factors controlling the competition between Phaeocystis and diatoms in the Southern Ocean and implications for carbon export fluxes
Characterization of particle-associated and free-living bacterial and archaeal communities along the water columns of the South China Sea
Adult life strategy affects distribution patterns in abyssal isopods – implications for conservation in Pacific nodule areas
Diversity and distribution of nitrogen fixation genes in the oxygen minimum zones of the world oceans
Structure and function of epipelagic mesozooplankton and their response to dust deposition events during the spring PEACETIME cruise in the Mediterranean Sea
Distribution of planktonic foraminifera in the subtropical South Atlantic: depth hierarchy of controlling factors
Technical note: Estimating light-use efficiency of benthic habitats using underwater O2 eddy covariance
Ocean acidification reduces growth and grazing impact of Antarctic heterotrophic nanoflagellates
Dynamics of environmental conditions during the decline of a Cymodocea nodosa meadow
A meta-analysis on environmental drivers of marine phytoplankton C : N : P
Spatial and temporal variability in the response of phytoplankton and prokaryotes to B-vitamin amendments in an upwelling system
Biogeography and community structure of abyssal scavenging Amphipoda (Crustacea) in the Pacific Ocean
Are seamounts refuge areas for fauna from polymetallic nodule fields?
Ocean deoxygenation and copepods: coping with oxygen minimum zone variability
Unexpected high abyssal ophiuroid diversity in polymetallic nodule fields of the northeast Pacific Ocean and implications for conservation
Population dynamics of modern planktonic foraminifera in the western Barents Sea
Foraminiferal community response to seasonal anoxia in Lake Grevelingen (the Netherlands)
Light availability modulates the effects of warming in a marine N2 fixer
SiR-actin-labelled granules in foraminifera: patterns, dynamics, and hypotheses
Alpha and beta diversity patterns of polychaete assemblages across the nodule province of the eastern Clarion-Clipperton Fracture Zone (equatorial Pacific)
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
Short summary
Short summary
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
Short summary
Short summary
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
Short summary
Short summary
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
Short summary
Short summary
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
Short summary
Short summary
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
Short summary
Short summary
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
Short summary
Short summary
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
Short summary
Short summary
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
Short summary
Short summary
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
Short summary
Short summary
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
Short summary
Short summary
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
Short summary
Short summary
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
Short summary
Short summary
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
Short summary
Short summary
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
Short summary
Short summary
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
Short summary
Short summary
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
Short summary
Short summary
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
Short summary
Short summary
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
Short summary
Short summary
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
Short summary
Short summary
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
Short summary
Short summary
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
Short summary
Short summary
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
Short summary
Short summary
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
Short summary
Short summary
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
Short summary
Short summary
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
Short summary
Short summary
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
Short summary
Short summary
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
Short summary
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.
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
Short summary
Short summary
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
Short summary
Short summary
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.
Cara Nissen and Meike Vogt
Biogeosciences, 18, 251–283, https://doi.org/10.5194/bg-18-251-2021, https://doi.org/10.5194/bg-18-251-2021, 2021
Short summary
Short summary
Using a regional Southern Ocean ecosystem model, we find that the relative importance of Phaeocystis and diatoms at high latitudes is controlled by iron and temperature variability, with light levels controlling the seasonal succession in coastal areas. Yet, biomass losses via aggregation and grazing matter as well. We show that the seasonal succession of Phaeocystis and diatoms impacts the seasonality of carbon export fluxes with ramifications for nutrient cycling and food web dynamics.
Jiangtao Li, Lingyuan Gu, Shijie Bai, Jie Wang, Lei Su, Bingbing Wei, Li Zhang, and Jiasong Fang
Biogeosciences, 18, 113–133, https://doi.org/10.5194/bg-18-113-2021, https://doi.org/10.5194/bg-18-113-2021, 2021
Short summary
Short summary
Few studies have focused on the particle-attached (PA) and free-living (FL) microbes of the deep ocean. Here we determined PA and FL microbial communities along depth profiles of the SCS. PA and FL fractions accommodated divergent microbial compositions, and most of them are potentially generalists with PA and FL dual lifestyles. A potential vertical connectivity between surface-specific microbes and those in the deep ocean was indicated, likely through microbial attachment to sinking particles.
Saskia Brix, Karen J. Osborn, Stefanie Kaiser, Sarit B. Truskey, Sarah M. Schnurr, Nils Brenke, Marina Malyutina, and Pedro Martinez Arbizu
Biogeosciences, 17, 6163–6184, https://doi.org/10.5194/bg-17-6163-2020, https://doi.org/10.5194/bg-17-6163-2020, 2020
Short summary
Short summary
The Clarion–Clipperton Fracture Zone (CCZ) located in the Pacific is commercially the most important area of proposed manganese nodule mining. Extraction of this will influence the life and distribution of small deep-sea invertebrates like peracarid crustaceans, of which >90 % are undescribed species new to science. We are doing a species delimitation approach as baseline for an ecological interpretation of species distribution and discuss the results in light of future deep-sea conservation.
Amal Jayakumar and Bess B. Ward
Biogeosciences, 17, 5953–5966, https://doi.org/10.5194/bg-17-5953-2020, https://doi.org/10.5194/bg-17-5953-2020, 2020
Short summary
Short summary
Diversity and community composition of nitrogen-fixing microbes in the three main oxygen minimum zones of the world ocean were investigated using nifH clone libraries. Representatives of three main clusters of nifH genes were detected. Sequences were most diverse in the surface waters. The most abundant OTUs were affiliated with Alpha- and Gammaproteobacteria. The sequences were biogeographically distinct and the dominance of a few OTUs was commonly observed in OMZs in this (and other) studies.
Guillermo Feliú, Marc Pagano, Pamela Hidalgo, and François Carlotti
Biogeosciences, 17, 5417–5441, https://doi.org/10.5194/bg-17-5417-2020, https://doi.org/10.5194/bg-17-5417-2020, 2020
Short summary
Short summary
The impact of Saharan dust deposition events on the Mediterranean Sea ecosystem was studied during a basin-scale survey (PEACETIME cruise, May–June 2017). Short-term responses of the zooplankton community were observed after episodic dust deposition events, highlighting the impact of these events on productivity up to the zooplankton level in the poorly fertilized pelagic ecosystems of the southern Mediterranean Sea.
Douglas Lessa, Raphaël Morard, Lukas Jonkers, Igor M. Venancio, Runa Reuter, Adrian Baumeister, Ana Luiza Albuquerque, and Michal Kucera
Biogeosciences, 17, 4313–4342, https://doi.org/10.5194/bg-17-4313-2020, https://doi.org/10.5194/bg-17-4313-2020, 2020
Short summary
Short summary
We observed that living planktonic foraminifera had distinct vertically distributed communities across the Subtropical South Atlantic. In addition, a hierarchic alternation of environmental parameters was measured to control the distribution of planktonic foraminifer's species depending on the water depth. This implies that not only temperature but also productivity and subsurface processes are signed in fossil assemblages, which could be used to perform paleoceanographic reconstructions.
Karl M. Attard and Ronnie N. Glud
Biogeosciences, 17, 4343–4353, https://doi.org/10.5194/bg-17-4343-2020, https://doi.org/10.5194/bg-17-4343-2020, 2020
Short summary
Short summary
Light-use efficiency defines the ability of primary producers to convert sunlight energy to primary production. This report provides a framework to compute hourly and daily light-use efficiency using underwater eddy covariance, a recent technological development that produces habitat-scale rates of primary production for many different habitat types. The approach, tested on measured flux data, provides a useful means to compare habitat productivity across time and space.
Stacy Deppeler, Kai G. Schulz, Alyce Hancock, Penelope Pascoe, John McKinlay, and Andrew Davidson
Biogeosciences, 17, 4153–4171, https://doi.org/10.5194/bg-17-4153-2020, https://doi.org/10.5194/bg-17-4153-2020, 2020
Short summary
Short summary
Our study showed how ocean acidification can exert both direct and indirect influences on the interactions among trophic levels within the microbial loop. Microbial grazer abundance was reduced at CO2 concentrations at and above 634 µatm, while microbial communities increased in abundance, likely due to a reduction in being grazed. Such changes in predator–prey interactions with ocean acidification could have significant effects on the food web and biogeochemistry in the Southern Ocean.
Mirjana Najdek, Marino Korlević, Paolo Paliaga, Marsej Markovski, Ingrid Ivančić, Ljiljana Iveša, Igor Felja, and Gerhard J. Herndl
Biogeosciences, 17, 3299–3315, https://doi.org/10.5194/bg-17-3299-2020, https://doi.org/10.5194/bg-17-3299-2020, 2020
Short summary
Short summary
The response of Cymodocea nodosa to environmental changes was reported during a 15-month period. The meadow decline was triggered in spring by the simultaneous reduction of available light in the water column and the creation of anoxic conditions in the rooted area. This disturbance was critical for the plant since it took place during its recruitment phase when metabolic needs are maximal and stored reserves minimal. The loss of such habitat-forming seagrass is a major environmental concern.
Tatsuro Tanioka and Katsumi Matsumoto
Biogeosciences, 17, 2939–2954, https://doi.org/10.5194/bg-17-2939-2020, https://doi.org/10.5194/bg-17-2939-2020, 2020
Short summary
Short summary
We conducted an extensive literature survey (meta-analysis) on how the C : N : P ratio varies with change in key environmental drivers. We found that the expected reduction in nutrients and warming under the future climate change scenario is likely to result in increased C : P and C : N of marine phytoplankton. Further, our findings highlight the greater stoichiometric plasticity of eukaryotes over prokaryotes, which provide us insights on how to understand and model plankton.
Vanessa Joglar, Antero Prieto, Esther Barber-Lluch, Marta Hernández-Ruiz, Emilio Fernández, and Eva Teira
Biogeosciences, 17, 2807–2823, https://doi.org/10.5194/bg-17-2807-2020, https://doi.org/10.5194/bg-17-2807-2020, 2020
Short summary
Short summary
Coastal marine ecosystems are among the most ecologically and economically productive areas providing a large fraction of ecosystem goods and services to human populations, and B vitamins have long been considered important growth factors for phytoplankton. Our findings indicate that the responses of microbial plankton to B-vitamin supply are mainly driven by the bacterial community composition and that microbial plankton in this area seems to be well adapted to cope with B-vitamin shortage.
Tasnim Patel, Henri Robert, Cedric D'Udekem D'Acoz, Koen Martens, Ilse De Mesel, Steven Degraer, and Isa Schön
Biogeosciences, 17, 2731–2744, https://doi.org/10.5194/bg-17-2731-2020, https://doi.org/10.5194/bg-17-2731-2020, 2020
Short summary
Short summary
Exploitation of deep-sea resources in one of the largest ecosystems on the planet has rendered research of its biodiversity more urgent than ever before. We investigated the known habitats and connectivity of deep-sea scavenging amphipods and obtained important knowledge about several species. We also demonstrated that a long-term disturbance experiment has possibly reduced amphipod biodiversity. These data and further sampling expeditions are instrumental for formulating sustainable policies.
Daphne Cuvelier, Pedro A. Ribeiro, Sofia P. Ramalho, Daniel Kersken, Pedro Martinez Arbizu, and Ana Colaço
Biogeosciences, 17, 2657–2680, https://doi.org/10.5194/bg-17-2657-2020, https://doi.org/10.5194/bg-17-2657-2020, 2020
Short summary
Short summary
Polymetallic nodule mining will remove hard substrata from the abyssal deep-sea floor. The only neighbouring ecosystems featuring hard substratum are seamounts, and their inhabiting fauna could aid in recovery post-mining. Nevertheless, first observations of seamount megafauna were very different from nodule-associated megafauna and showed little overlap. The possible uniqueness of these ecosystems implies that they should be included in management plans for the conservation of biodiversity.
Karen F. Wishner, Brad Seibel, and Dawn Outram
Biogeosciences, 17, 2315–2339, https://doi.org/10.5194/bg-17-2315-2020, https://doi.org/10.5194/bg-17-2315-2020, 2020
Short summary
Short summary
Increasing deoxygenation and oxygen minimum zone expansion are consequences of global warming. Copepod species had different vertical distribution strategies and physiologies associated with oxygen profile variability (0–1000 m). Species (1) changed vertical distributions and maximum abundance depth, (2) shifted diapause depth, (3) changed diel vertical migration depths, or (4) changed epipelagic depth range in the aerobic mixed layer. Present-day variability helps predict future scenarios.
Magdalini Christodoulou, Timothy O'Hara, Andrew F. Hugall, Sahar Khodami, Clara F. Rodrigues, Ana Hilario, Annemiek Vink, and Pedro Martinez Arbizu
Biogeosciences, 17, 1845–1876, https://doi.org/10.5194/bg-17-1845-2020, https://doi.org/10.5194/bg-17-1845-2020, 2020
Short summary
Short summary
Unexpectedly high diversity was revealed in areas licenced for polymetallic nodule mining exploration in the Pacific Ocean. For the first time, a comprehensive reference library including 287 novel ophiuroid sequences allocated to 43 species was produced. Differences in food availability along the nodule province of CCZ were reflected in the biodiversity patterns observed. The APEI3's dissimilarity with the exploration contract areas questions its ability to serve as a biodiversity reservoir.
Julie Meilland, Hélène Howa, Vivien Hulot, Isaline Demangel, Joëlle Salaün, and Thierry Garlan
Biogeosciences, 17, 1437–1450, https://doi.org/10.5194/bg-17-1437-2020, https://doi.org/10.5194/bg-17-1437-2020, 2020
Short summary
Short summary
This study reports on planktonic foraminifera (PF) diversity and distribution in the Barents Sea. The species Globigerinita uvula and Turborotalita quinqueloba dominate the water column while surface sediments are dominated by Neogloboquadrina pachyderma. We hypothesize the unusual dominance of G. uvula in the water to be a seasonal signal or a result of climate forcing. Size-normalized-protein concentrations of PF show a northward decrease, suggesting biomass to vary with the environment.
Julien Richirt, Bettina Riedel, Aurélia Mouret, Magali Schweizer, Dewi Langlet, Dorina Seitaj, Filip J. R. Meysman, Caroline P. Slomp, and Frans J. Jorissen
Biogeosciences, 17, 1415–1435, https://doi.org/10.5194/bg-17-1415-2020, https://doi.org/10.5194/bg-17-1415-2020, 2020
Short summary
Short summary
The paper presents the response of benthic foraminiferal communities to seasonal absence of oxygen coupled with the presence of hydrogen sulfide, considered very harmful for several living organisms.
Our results suggest that the foraminiferal community mainly responds as a function of the duration of the adverse conditions.
This knowledge is especially useful to better understand the ecology of benthic foraminifera but also in the context of palaeoceanographic interpretations.
Xiangqi Yi, Fei-Xue Fu, David A. Hutchins, and Kunshan Gao
Biogeosciences, 17, 1169–1180, https://doi.org/10.5194/bg-17-1169-2020, https://doi.org/10.5194/bg-17-1169-2020, 2020
Short summary
Short summary
Combined effects of warming and light intensity were estimated in N2-fixing cyanobacterium Trichodesmium. Its physiological responses to warming were significantly modulated by light, with growth peaking at 27 °C under the light-saturating condition but being non-responsive across the range of 23–31 °C under the light-limiting condition. Light shortage also weakened the acclimation ability of Trichodesmium to warming, making light-limited Trichodesmium more sensitive to acute temperature change.
Jan Goleń, Jarosław Tyszka, Ulf Bickmeyer, and Jelle Bijma
Biogeosciences, 17, 995–1011, https://doi.org/10.5194/bg-17-995-2020, https://doi.org/10.5194/bg-17-995-2020, 2020
Short summary
Short summary
We studied the organisation and dynamics of actin in foraminifera. Actin is one of the key structural proteins in most lifeforms. Our investigations show that in foraminifera it forms small granules, around 1 µm in diameter, that display rapid movement. This granularity is unusual in comparison to other organisms. We suppose that these granules are most likely involved in the formation of all types of pseudopods responsible for movement, food capturing, biomineralisation, and other functions.
Paulo Bonifácio, Pedro Martínez Arbizu, and Lénaïck Menot
Biogeosciences, 17, 865–886, https://doi.org/10.5194/bg-17-865-2020, https://doi.org/10.5194/bg-17-865-2020, 2020
Short summary
Short summary
The patterns observed in the composition of polychaete assemblages were attributed to variations in food supply at the regional scale and nodule density at the local scale. The high levels of species replacement were mainly driven by rare species, leading to regional species pool estimates between 498 and 240 000 species. The high proportion of singletons seems reflect an under-sampling bias that is currently preventing the assessment of potential biodiversity loss due to nodule mining.
Cited articles
Aguzzi, J., Costa, C., Fujiwara, Y., Iwase, R., Ramirez-Llorda, E., and
Menesatti, P.: A novel morphometry-based protocol of automated video-image
analysis for species recognition and activity rhythms monitoring in deep-sea
fauna, Sensors, 9, 8438–8455, 2009. a
Amante, C. and Eakins, B. W.: ETOPO1 1 Arc-Minute Global Relief Model: Procedures, Data Sources and Analysis, NOAA Technical Memorandum NESDIS NGDC-24, National Geophysical Data Center, NOAA, https://doi.org/10.7289/V5C8276M, 2009. a
Ayma, A., Aguzzi, J., Canals, M., Lastras, G., Bahamon, N., Mechó, A., and
Company, J.: Comparison between ROV video and Agassiz trawl methods for
sampling deep water fauna of submarine canyons in the Northwestern
Mediterranean Sea with observations on behavioural reactions of target
species, Deep-Sea Res. Pt. I, 114,
149–159, 2016. a
Beaulieu, S.: Life on glass houses: sponge stalk communities in the deep sea,
Mar. Biol., 138, 803–817, 2001. a
Bergmann, M., Soltwedel, T., and Klages, M.: The interannual variability of
megafaunal assemblages in the Arctic deep sea: Preliminary results from the
HAUSGARTEN observatory (79∘ N), Deep-Sea Res. Pt. I, 58, 711–723, 2011. a
Boetius, A.: RV Sonne Fahrtbericht/Cruise Report SO242-2: JPI OCEANS Ecological
Aspects of Deep-Sea Mining, DISCOL Revisited, Guayaquil – Guayaquil
(Equador), 28.08.–01.10.2015, Helmholtz-Zentrum für
Ozeanforschung, Kiel, https://doi.org/10.3289/GEOMAR_REP_NS_27_2015, 2015. a, b
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, 2001. a
Burns, R. and Burns, V. M.: The mineralogy and crystal chemistry of deep-sea
manganese nodules, a polymetallic resource of the twenty-first century,
Philos. T. Roy. Soc. A, 286, 283–301, 1977. a
Cairns, S. D.: New abyssal Primnoidae (Anthozoa: Octocorallia) from the
Clarion-Clipperton Fracture Zone, equatorial northeastern Pacific, Mar.
Biodivers., 46, 141–150, 2016. a
Cauwerts, C., Bodart, M., and Deneyer, A.: Comparison of the vignetting effects
of two identical fisheye lenses, Leukos, 8, 181–203, 2012. a
De Smet, B., Pape, E., Riehl, T., Bonifácio, P., Colson, L., and Vanreusel,
A.: The community structure of deep-sea macrofauna associated with
polymetallic nodules in the eastern part of the Clarion-Clipperton Fracture
Zone, Front. Mar. Sci., 4, 103, https://doi.org/10.3389/fmars.2017.00103, 2017. a
Drazen, J. C., Leitner, A. B., Morningstar, S., Marcon, Y., Greinert, J., and Purser, A.: Observations of deep-sea fishes and mobile scavengers from the abyssal DISCOL experimental mining area, Biogeosciences, 16, 3133–3146, https://doi.org/10.5194/bg-16-3133-2019, 2019. a
Durden, J., Schoening, T., Althaus, F., Friedman, A., Garcia, R., Glover, A., Greinert, J., Jacobsen Stout, N., Jones, D. O. B., Jordt, A., Kaeli, J., Köser, K., Kuhnz, L., Lindsay, D., Morris, K., Nattkemper, T. W., Osterloff, J., Ruhl, H. A., Singh, H., Tran, M., and Bett, B. J.:
Perspectives in visual imaging for marine biology and ecology: from acquisition to understanding, Oceanography and Marine Biology: An Annual Review, 54, 1–72, https://doi.org/10.1201/9781315368597, 2016. a
Gage, J. and Bett, B.: Deep-sea benthic sampling, Methods for the Study of the
Marine Benthos, 273–325, Blackwell, Oxford, UK, 2005. a
Gardner, J. and Struthers, C.: Comparisons among survey methodologies to test
for abundance and size of a highly targeted fish species, J. Fish
Biol., 82, 242–262, 2013. a
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 Arbizu, P. M.: Resilience
of benthic deep-sea fauna to mining activities, Mar. Environ.
Res., 129, 76–101, 2017. a
Gooday, A. J., Holzmann, M., Caulle, C., Goineau, A., Kamenskaya, O., Weber, A.
A.-T., and Pawlowski, J.: Giant protists (xenophyophores, Foraminifera) are
exceptionally diverse in parts of the abyssal eastern Pacific licensed for
polymetallic nodule exploration, Biol. Conserv., 207, 106–116,
2017. a
Howell, K.-L., Piechaud, N., Downie, A.-L., and Kenny, A.: The distribution of
deep-sea sponge aggregations in the North Atlantic and implications for their
effective spatial management, Deep-Sea Res. Pt. I, 115, 309–320, 2016. a
Huvenne, V., Bett, B., Masson, D., Le Bas, T., and Wheeler, A. J.:
Effectiveness of a deep-sea cold-water coral Marine Protected Area, following
eight years of fisheries closure, Biol. Conserv., 200, 60–69, 2016. a
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. a, b, c, d, e
Kersken, D., Kocot, K., Janussen, D., Schell, T., Pfenninger, M., and Arbizu,
P. M.: First insights into the phylogeny of deep-sea glass sponges
(Hexactinellida) from polymetallic nodule fields in the Clarion-Clipperton
Fracture Zone (CCFZ), northeastern Pacific, Hydrobiologia, 811, 283–293,
2018. a
Kwasnitschka, T., Köser, K., Sticklus, J., Rothenbeck, M., Weiß, T.,
Wenzlaff, E., Schoening, T., Triebe, L., Steinführer, A., Devey, C.,
and Greinert, J.: DeepSurveyCam – A deep ocean optical mapping system, Sensors, 16,
164, https://doi.org/10.3390/s16020164, 2016. a, b, c
Langenkämper, D., Zurowietz, M., Schoening, T., and Nattkemper, T. W.:
Biigle 2.0-browsing and annotating large marine image collections, Front. Mar. Sci., 4, 83, https://doi.org/10.3389/fmars.2017.00083, 2017. a, b, c
Linke, P. and Lackschewitz, K.: Autonomous Underwater Vehicle ABYSS, Journal of large-scale research facilities, 2, 79, https://doi.org/10.17815/jlsrf-2-149, 2016. a
Lodge, M., Johnson, D., Le Gurun, G., Wengler, M., Weaver, P., and Gunn, V.:
Seabed mining: International Seabed Authority environmental management plan
for the Clarion–Clipperton Zone. A partnership approach, Mar. Policy, 49,
66–72, 2014. a
Marcon, Y. and Purser, A.: PAPARA (ZZ) I: An open-source software interface for
annotating photographs of the deep-sea, SoftwareX, 6, 69–80, 2017. a
McHugh, M. L.: Interrater reliability: the kappa statistic, Biochem. Medica, 22, 276–282, 2012. a
McPhail, S., Furlong, M., and Pebody, M.: Low-altitude terrain following and
collision avoidance in a flight-class autonomous underwater vehicle,
P. I. Mech. Eng. M-J. Eng., 224, 279–292, 2010. a
Mewes, K., Mogollón, J. M., Picard, A., Rühlemann, C., Kuhn, T.,
Nöthen, K., and Kasten, S.: Impact of depositional and biogeochemical
processes on small scale variations in nodule abundance in the
Clarion-Clipperton Fracture Zone, Deep-Sea Res. Pt. I, 91, 125–141, 2014. a
Morris, K. J., Bett, B. J., Durden, J. M., Huvenne, V. A., Milligan, R., Jones,
D. O., McPhail, S., Robert, K., Bailey, D. M., and Ruhl, H. A.: A new method
for ecological surveying of the abyss using autonomous underwater vehicle
photography, Limnol. Oceanogr.-Meth., 12, 795–809, 2014. a
Mullineaux, L. S.: Organisms living on manganese nodules and crusts:
distribution and abundance at three North Pacific sites, Deep-Sea Res.
Pt. A, 34, 165–184, 1987. a
Mullineaux, L. S.: Vertical distributions of the epifauna on manganese nodules:
implications for settlement and feeding, Limnol. Oceanogr., 34,
1247–1262, 1989. a
Murphy, H. M. and Jenkins, G. P.: Observational methods used in marine spatial
monitoring of fishes and associated habitats: a review, Mar. Freshwater
Res., 61, 236–252, 2010. a
Norse, E. A., Brooke, S., Cheung, W. W., Clark, M. R., Ekeland, I., Froese, R.,
Gjerde, K. M., Haedrich, R. L., Heppell, S. S., Morato, T., Morgan, L. E., Pauly, D., Sumaila, R., and Watson, R.:
Sustainability of deep-sea fisheries, Mar. Policy, 36, 307–320, 2012. a
Orejas, C., Gori, A., Iacono, C. L., Puig, P., Gili, J.-M., and Dale, M. R.:
Cold-water corals in the Cap de Creus canyon, northwestern Mediterranean:
spatial distribution, density and anthropogenic impact, Mar. Ecol.-Prog. Ser., 397, 37–51, 2009. a
Paul, S. A., Gaye, B., Haeckel, M., Kasten, S., and Koschinsky, A.:
Biogeochemical regeneration of a nodule mining disturbance site: trace
metals, DOC and amino acids in deep-sea sediments and pore waters, Front. Mar. Sci., 5, 117, https://doi.org/10.3389/fmars.2018.00117, 2018. a
Petersen, S., Hannington, M., and Krätschell, A.: Technology developments
in the exploration and evaluation of deep-sea mineral resources, Annales
des Mines-Responsabilite et environnement, 1, 14–18, 2017. a
Peukert, A., Petersen, S., Greinert, J., and Charlot, F.: Seabed Mining, in: Submarine Geomorphology, edited by: Micallef, A., Krastel, S., and Savini, A., Springer Geology, Springer, Cham, 2018a. a
Peukert, A., Schoening, T., Alevizos, E., Köser, K., Kwasnitschka, T., and Greinert, J.: Understanding Mn-nodule distribution and evaluation of related deep-sea mining impacts using AUV-based hydroacoustic and optical data, Biogeosciences, 15, 2525–2549, https://doi.org/10.5194/bg-15-2525-2018, 2018b. a
Peyronnet, J.-P., Person, R., and Rybicki, F.: Posidonia 6000: a new long range
highly accurate ultra short base line positioning system, in: IEEE Oceanic
Engineering Society. OCEANS'98, Conference Proceedings (Cat. No. 98CH36259),
Vol. 3, 1721–1727, IEEE, Nice, France, 1998. a
Pham, C. K., Ramirez-Llodra, E., Alt, C. H. S., Amaro, T., Bergmann, M., Canals, M., Company, J. B.,
Davies, J., Duineveld, G., Galgani, F., Howell, K. L., Huvenne, V. A. I., Isidro, E., Jones, D. O. B., Lastras, G., Morato, T., Gomes-Pereira, J. N., Purser, A., Stewart, H., Tojeira, I., Tubau, X., Van Rooij, D., and Tyler, P. A.: Marine
litter distribution and density in European seas, from the shelves to deep
basins, PloS One, 9, e95839, https://doi.org/10.1371/journal.pone.0095839, 2014. a
Purser, A.: A time series study of Lophelia pertusa and reef megafauna
responses to drill cuttings exposure on the Norwegian margin, PloS One, 10,
e0134076, https://doi.org/10.1371/journal.pone.0134076, 2015. a, b, c, d
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,
87–99, 2018. a
Roark, E. B., Guilderson, T. P., Dunbar, R. B., Fallon, S. J., and Mucciarone,
D. A.: Extreme longevity in proteinaceous deep-sea corals, P.
Natl. Acad. Sci. USA, 106, 5204–5208, 2009. a
Schoening, T., Bergmann, M., Ontrup, J., Taylor, J., Dannheim, J., Gutt, J.,
Purser, A., and Nattkemper, T. W.: Semi-automated image analysis for the
assessment of megafaunal densities at the Arctic deep-sea observatory
HAUSGARTEN, PloS One, 7, e38179, https://doi.org/10.1371/journal.pone.0038179, 2012. a, b, c
Schoening, T., Osterloff, J., and Nattkemper, T. W.: RecoMIA – Recommendations
for marine image annotation: Lessons learned and future directions, Front. Mar. Sci., 3, 59, https://doi.org/10.3389/fmars.2016.00059, 2016b. a
Schoening, T., Jones, D. O., and Greinert, J.: Compact-morphology-based
poly-metallic nodule delineation, Sci. Rep.-UK, 7, 13338, https://doi.org/10.1038/s41598-017-13335-x, 2017. a, b
Schoening, T., Köser, K., and Greinert, J.: An acquisition, curation and
management workflow for sustainable, terabyte-scale marine image analysis,
Scientific Data, 5, 180–181, 2018. a
Schriever, G. and Thiel, H.: Cruise report DISCOL 3, Sonne cruise 77, January 26–February 27, 1992, Balboa/Panama – Balboa/Panama, Institut für Hydrobiologie und Fischereiwissenschaft, Universität Hamburg, 1992. a
Sharma, R.: Deep-Sea Mining, Springer, Cham, Switzerland, 2017. a
Sharma, R.: Environmental Issues of Deep-Sea Mining: Impacts, Consequences and
Policy Perspectives, Springer, Cham, Switzerland, 2019. a
Siddiqui, S. A., Salman, A., Malik, M. I., Shafait, F., Mian, A., Shortis,
M. R., and Harvey, E. S.: Automatic fish species classification in underwater
videos: exploiting pre-trained deep neural network models to compensate for
limited labelled data, ICES J. Mar. Sci., 75, 374–389, 2017. a
Simon-Lledó, E., Bett, B. J., Huvenne, V. A., Köser, K., Schoening, T.,
Greinert, J., and Jones, D. O.: Biological effects 26 years after simulated
deep-sea mining, Sci. Rep.-UK, 9, 8040, https://doi.org/10.1038/s41598-019-44492-w, 2019a. a, b, c, d
Taylor, J., Krumpen, T., Soltwedel, T., Gutt, J., and Bergmann, M.:
Regional-and local-scale variations in benthic megafaunal composition at the
Arctic deep-sea observatory HAUSGARTEN, Deep-Sea Res. Pt. I, 108, 58–72, 2016. a
Taylor, J., Krumpen, T., Soltwedel, T., Gutt, J., and Bergmann, M.: Dynamic
benthic megafaunal communities: Assessing temporal variations in structure,
composition and diversity at the Arctic deep-sea observatory HAUSGARTEN
between 2004 and 2015, Deep-Sea Res. Pt. I, 122, 81–94, 2017. a
Thiel, H.: Evaluation of the environmental consequences of polymetallic nodule
mining based on the results of the TUSCH Research Association, Deep-Sea
Res. Pt. II, 48, 3433–3452, 2001. a
Tilot, V., Ormond, R., Moreno Navas, J., and Catalá, T. S.: The benthic
megafaunal assemblages of the CCZ (Eastern Pacific) and an approach to their
management in the face of threatened anthropogenic impacts, Front.
Mar. Sci., 5, 7, https://doi.org/10.3389/fmars.2018.00007, 2018. a
Volkmann, S. E. and Lehnen, F.: Production key figures for planning the mining
of manganese nodules, Mar. Georesour. Geotec., 36, 360–375,
2018. a
Watling, H.: Review of biohydrometallurgical metals extraction from
polymetallic mineral resources, Minerals, 5, 1–60, 2015. a
Wilson, S., Graham, N., and Polunin, N.: Appraisal of visual assessments of
habitat complexity and benthic composition on coral reefs, Mar. Biol.,
151, 1069–1076, 2007. a
Yamazaki, T. and Brockett, F. H.: History of Deep-Ocean Mining, Encyclopedia of Maritime and Offshore Engineering, 1–9, https://doi.org/10.1002/9781118476406.emoe067, 2017. a
Yu, C., Xiang, X., Wilson, P., and Zhang, Q.: Guidance-error-based robust fuzzy
adaptive control for bottom following of a flight-style AUV with delayed and
saturated control surfaces, IEEE T. Cybernetics, 50, 1887–1899, https://doi.org/10.1109/TCYB.2018.2890582, 2018. a
Zurowietz, M., Langenkämper, D., Hosking, B., Ruhl, H. A., and Nattkemper,
T. W.: MAIA – A machine learning assisted image annotation method for
environmental monitoring and exploration, PloS One, 13, https://doi.org/10.1371/journal.pone.0207498, 2018. a
Short summary
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.
Seafloor imaging is widely used in marine science and industry to explore and monitor areas of...
Special issue
Altmetrics
Final-revised paper
Preprint