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  • 1
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    Thalassiosira weissflogii attachment assay and phylogenetic affiliation of bacterial isolates from samples of the German Wadden Sea
    PANGAEA
    In:  Supplement to: Gärdes, Astrid; Iversen, Morten Hvitfeldt; Grossart, Hans-Peter; Passow, Uta; Ullrich, Matthias S (2011): Diatom-associated bacteria are required for aggregation of Thalassiosira weissflogii. The ISME Journal, 5(3), 436-445, https://doi.org/10.1038/ismej.2010.145
    Details
    Publication Date: 2023-05-12
    Description: Aggregation of algae, mainly diatoms, is an important process in marine systems leading to the settling of particulate organic carbon predominantly in the form of marine snow. Exudation products of phytoplankton form transparent exopolymer particles (TEP), which acts as the glue for particle aggregation. Heterotrophic bacteria interacting with phytoplankton may influence TEP formation and phytoplankton aggregation. This bacterial impact has not been explored in detail. We hypothesized that bacteria attaching to Thalassiosira weissflogii might interact in a yet-to-be determined manner, which could impact TEP formation and aggregate abundance. The role of individual T. weissflogii-attaching and free-living new bacterial isolates for TEP production and diatom aggregation was investigated in vitro. T. weissflogii did not aggregate in axenic culture, and striking differences in aggregation dynamics and TEP abundance were observed when diatom cultures were inoculated with either diatom-attaching or free-living bacteria. The data indicated that free-living bacteria might not influence aggregation whereas bacteria attaching to diatom cells may increase aggregate formation. Interestingly, photosynthetically inactivated T. weissflogii cells did not aggregate regardless of the presence of bacteria. Comparison of aggregate formation, TEP production, aggregate sinking velocity and solid hydrated density revealed remarkable differences. Both, photosynthetically active T. weissflogii and specific diatom-attaching bacteria were required for aggregation. It was concluded that interactions between heterotrophic bacteria and diatoms increased aggregate formation and particle sinking and thus may enhance the efficiency of the biological pump.
    Keywords: Center for Marine Environmental Sciences; DIVER; German_Bight_1997-1999; German_Wadden_Sea_2000; German Bight, North Sea; German Bight Wadden Sea; German Wadden Sea; MARUM; PLA; Plankton net; Sampling by diver
    Type: Dataset
    Format: application/zip, 4 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    (Table 1) Thalassiosira weissflogii attachment assay
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Bacterial abundance in colony forming units; Center for Marine Environmental Sciences; German_Wadden_Sea_2000; German Bight Wadden Sea; German Wadden Sea; MARUM; PLA; Plankton net; see reference(s); Time coverage
    Type: Dataset
    Format: text/tab-separated-values, 28 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 3
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    (Supplementary Table 1) Phylogenetic affiliation of particle-associated bacterial isolates
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Best match; Center for Marine Environmental Sciences; German_Wadden_Sea_2000; German Bight Wadden Sea; German Wadden Sea; MARUM; PLA; Plankton net; see reference(s); Similarity; Strain
    Type: Dataset
    Format: text/tab-separated-values, 99 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 4
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    (Supplementary Table 2) Phylogenetic affiliation of bacterial strains isolated from Halichondria panacea
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Best match; Center for Marine Environmental Sciences; DIVER; German_Bight_1997-1999; German Bight, North Sea; MARUM; Sampling by diver; see reference(s); Similarity; Strain
    Type: Dataset
    Format: text/tab-separated-values, 93 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 5
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    (Supplementary Table 3) Phylogenetic affiliation of particle-associated bacterial isolates
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Center for Marine Environmental Sciences; German_Wadden_Sea_2000; German Bight Wadden Sea; German Wadden Sea; Group; MARUM; PLA; Plankton net; Sample code/label; see reference(s); Strain
    Type: Dataset
    Format: text/tab-separated-values, 63 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 6
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    Permafrost longterm monitoring sites (Arctic and Antarctic) (2014)
    PANGAEA
    In:  Supplement to: Bartsch, Annett; Allard, Michel; Biskaborn, Boris K; Burba, George; Christiansen, Hanne Hvidtfeldt; Duguay, Claude R; Grosse, Guido; Günther, Frank; Heim, Birgit; Högström, Elin; Kääb, Andreas; Keuper, Frida; Lanckman, Jean-Pierre; Lantuit, Hugues; Lauknes, Tom Rune; Leibman, Marina O; Liu, Lin; Morgenstern, Anne; Necsoiu, Marius; Overduin, Pier Paul; Pope, Allen; Sachs, Torsten; Séjourné, Antoine; Streletskiy, Dmitry A; Strozzi, Tazio; Ullmann, Tobias; Ullrich, Matthias S; Vieira, Gonçalo; Widhalm, Barbara (2014): Requirements for monitoring of permafrost in polar regions - A community white paper in response to the WMO Polar Space Task Group (PSTG), Version 4, 2014-10-09. Austrian Polar Research Institute, Vienna, Austria, 20 pp, hdl:10013/epic.45648.d001
    Details
    Publication Date: 2023-11-16
    Description: About 50 locations ('cold spots') where permafrost (Arctic and Antarctic) in situ monitoring has been taking place for many years or where field stations are currently established (through, for example the Canadian ADAPT program) have been identified. These sites have been proposed to WMO Polar Space Task Group as focus areas for future monitoring by satellite data. Seven monitoring transects spanning different permafrost types have been proposed in addition.
    Keywords: Changing Permafrost in the Arctic and its Global Effects in the 21st Century; Country; Elevation, maximum; Elevation, mean; Elevation, minimum; File name; Identification; LATITUDE; Latitude 2; LONGITUDE; Longitude 2; PAGE21; Permafrost; Persistent Identifier; Site
    Type: Dataset
    Format: text/tab-separated-values, 572 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 7
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    Aggregation and Sedimentation of Thalassiosira weissflogii (diatom) in a Warmer and More Acidified Future Ocean (2014)
    Public Library of Science
    Details
    Publication Date: 2022-05-26
    Description: © The Author(s), 2014. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in PLoS One 9 (2014): e112379, doi:10.1575/1912/6845.
    Description: Increasing Transparent Exopolymer Particle (TEP) formation during diatom blooms as a result of elevated temperature and pCO2 have been suggested to result in enhanced aggregation and carbon flux, therewith potentially increasing the sequestration of carbon by the ocean. We present experimental results on TEP and aggregate formation by Thalassiosira weissflogii (diatom) in the presence or absence of bacteria under two temperature and three pCO2 scenarios. During the aggregation phase of the experiment TEP formation was elevated at the higher temperature (20°C vs. 15°C), as predicted. However, in contrast to expectations based on the established relationship between TEP and aggregation, aggregation rates and sinking velocity of aggregates were depressed in warmer treatments, especially under ocean acidification conditions. If our experimental findings can be extrapolated to natural conditions, they would imply a reduction in carbon flux and potentially reduced carbon sequestration after diatom blooms in the future ocean.
    Description: This work was supported by National Science Foundation grants OCE-0926711 & OCE-1041038 to UP and Helmholtz Graduate School for Polar and Marine Research and Jacobs University Bremen to SS.
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: application/pdf
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    PAPER (OA)
  • 8
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    The ocean sampling day consortium (2015)
    BioMed Central
    Details
    Publication Date: 2022-10-18
    Description: © The Author(s), 2015. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in GigaScience 4 (2015): 27, doi:10.1186/s13742-015-0066-5.
    Description: Ocean Sampling Day was initiated by the EU-funded Micro B3 (Marine Microbial Biodiversity, Bioinformatics, Biotechnology) project to obtain a snapshot of the marine microbial biodiversity and function of the world’s oceans. It is a simultaneous global mega-sequencing campaign aiming to generate the largest standardized microbial data set in a single day. This will be achievable only through the coordinated efforts of an Ocean Sampling Day Consortium, supportive partnerships and networks between sites. This commentary outlines the establishment, function and aims of the Consortium and describes our vision for a sustainable study of marine microbial communities and their embedded functional traits.
    Description: This work was supported by the Micro B3 project, which is funded from the European Union’s Seventh Framework Programme (FP7; Joint Call OCEAN.2011‐2: Marine microbial diversity – new insights into marine ecosystems functioning and its biotechnological potential) under the grant agreement no 287589.
    Keywords: Ocean sampling day ; OSD ; Biodiversity ; Genomics ; Health index ; Bacteria ; Microorganism ; Metagenomics ; Marine ; Micro B3 ; Standards
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: application/pdf
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    PAPER (OA)
  • 9
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    Heavy-Metal-Resistant Microorganisms in Deep-Sea Sediments Disturbed by Mining Activity: An Application Toward the Development of Experimental in vitro Systems (2019)
    Frontiers
    In:  Frontiers in Marine Science, 6 (462).
    Details
    Publication Date: 2022-01-31
    Description: Future mining of polymetallic nodules in the Clarion Clipperton Zone (Northeastern Pacific) is expected to affect all benthic ecosystems. The diversity, distribution, and environmental functions of microorganisms inhabiting abyssal sediments are barely understood. To understand consequences of deep-sea mining, experimental in vitro systems needs to be established to test hypotheses on the environmental impact of mining. For this, 40 bacterial strains, belonging to proteobacteria, actinobacteria and firmicutes were isolated from deep-sea sediments and nodules sampled at depths of ≥ 4000 m. Phenotypic characterization revealed a strong inter-species and moderate intra-species variability. Determination of metal minimum inhibitory concentrations indicated the presence of acute manganese-resistant bacteria such as Rhodococcus erythropolis (228.9 mM), Loktanella cinnabarina (57.2 mM), and Dietzia maris (14.3 mM) that might be suitable systems for testing the effects of release of microbes from nodules and their interactions with sediment particles in plumes generated during mining. Comparative genomic analysis indicated the presence of manganese efflux systems relevant for future transcriptomics or proteomics approaches with environmental samples and might serve in paving the way to develop model systems including representative organisms which are currently not cultivable. Monitoring deep-sea mining activity at abyssal depth is a challenge that has to be tackled. We proposed the use of API strips as a fast on-board methodology for bacterial monitoring as an indicator for sediment plume dispersions within the water column.
    Type: Article , PeerReviewed
    Format: text
    Format: other
    DOI: 10.3389/fmars.2019.00462
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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