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Vonnahme, Tobias (2018): Effects of simulated deep-sea mining impacts on microbial communities and functions in the DISCOL experimental area. PANGAEA, https://doi.org/10.1594/PANGAEA.887412

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Abstract:
Deep-sea mining for manganese nodules appears to be an attractive option to supply the growing demand for metal resources. The technologies are advancing and the costs for deep-sea mining are dropping. The effect on the deep-sea ecosystems, in particular on microbial processes is hardly understood, making environmental management and monitoring efforts hard to focus. Long-term mining simulations can be used to assess the effects of deep-sea mining and the potential for recovery. We revisited a large-scale disturbance and recolonization (DISCOL) experimental area in the Peru Basin, 26 years after the disturbance and compared the disturbances with fresh tracks and reference areas. State of the art technologies and methods, such as, operations with a remotely operated vehicle (ROV), in situ flux measurements, estimation of biogeochemical parameters and activities, and investigation of microbial community structures via next generation sequencing, allowed the investigation of disturbances, related to deep-sea mining operations. During the disturbance simulations, surface sediment was removed, and suboxic subsurface layers were exposed. These deeper sediment layers had different microbial communities, lower amount of labile organic matter, less microbial biomass, and reduced activities. After 26 years, the organic matter did not rebuild, and cell numbers ,activities, and the assimilation efficiency stayed low. Only the community structure appeared to be recovered.
Coverage:
Median Latitude: -7.081122 * Median Longitude: -88.457914 * South-bound Latitude: -7.125533 * West-bound Longitude: -88.526767 * North-bound Latitude: -7.065900 * East-bound Longitude: -88.412967
Date/Time Start: 2015-08-31T00:00:00 * Date/Time End: 2015-09-28T06:36:41
Minimum DEPTH, sediment/rock: 0.005 m * Maximum DEPTH, sediment/rock: 0.150 m
Event(s):
SO242/2_142_PUC-12-14-55 * Latitude: -7.074000 * Longitude: -88.463900 * Date/Time: 2015-08-31T00:00:00 * Elevation: -4151.0 m * Location: South Pacific Ocean, Peru Basin * Campaign: SO242/2 (JPI-OCEANS) * Basis: Sonne_2 * Method/Device: Push corer (PUC) * Comment: Sediment pooled from SO242/2_232_PUC-12, SO242/2_232_PUC-14, SO242/2_232_PUC-55
SO242/2_142_PUC-18-34-46 * Latitude: -7.074000 * Longitude: -88.463900 * Date/Time: 2015-08-31T00:00:00 * Elevation: -4151.0 m * Location: South Pacific Ocean, Peru Basin * Campaign: SO242/2 (JPI-OCEANS) * Basis: Sonne_2 * Method/Device: Push corer (PUC) * Comment: Sediment pooled from SO242/2_232_PUC-18, SO242/2_232_PUC-34, SO242/2_232_PUC-46
SO242/2_142_PUC-24-53 * Latitude: -7.074000 * Longitude: -88.463900 * Date/Time: 2015-08-31T00:00:00 * Elevation: -4151.0 m * Location: South Pacific Ocean, Peru Basin * Campaign: SO242/2 (JPI-OCEANS) * Basis: Sonne_2 * Method/Device: Push corer (PUC) * Comment: Sediment pooled from SO242/2_232_PUC-24, SO242/2_232_PUC-53
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEventVonnahme, Tobias
2Depth, top/minDepth topmVonnahme, Tobias
3Depth, bottom/maxDepth botmVonnahme, Tobias
4DEPTH, sediment/rockDepthmVonnahme, TobiasGeocode
5Sample IDSample IDVonnahme, Tobias
6Sample commentSample commentVonnahme, Tobias
7MicrohabitatMicrohabitatVonnahme, Tobias
8Chlorophyll per unit volume of sedimentChl/sedµg/mlVonnahme, Tobias
9PhaeophytinPhaeophytinµg/lVonnahme, Tobias
10Porosity, totalPoros totalVonnahme, TobiasNICE - Nitrogen Cycling in Estuaries
11Nitrogen, particulatePNµg/gVonnahme, TobiasCarbon/nitrogen analyser
12Carbon, organic, totalTOCmg/kgVonnahme, TobiasCarbon/nitrogen analyser
13Nitrogen, particulatePNµg/gVonnahme, TobiasAcidification then carbon/nitrogen analyser
14Carbon, organic, totalTOCmg/kgVonnahme, TobiasAcidification then carbon/nitrogen analyser
15ProkaryotesProkaryotes#/mlVonnahme, TobiasAcridine Orange Direct Counting (AODC)wet sediment
16beta-glucosidase activityMUF-bgluµmol/l/hVonnahme, Tobias
17Chitobiase activityChitobiase activityµmol/l/hVonnahme, Tobias
18Aminopeptidase activityMCA-Aminopeptµmol/l/hVonnahme, Tobias
19Esterase activity per sediment volumeFDAnmol/ml/hVonnahme, Tobias
20Dark carbon fixation rateDCF ratenmol/g/dayVonnahme, Tobiasconversion into DOC
21Dark carbon fixation rateDCF ratenmol/g/dayVonnahme, Tobiasconversion into Biomass
22Leucine uptake rateLeu upt ratenmol/g/dayVonnahme, Tobias
Size:
4954 data points

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