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  • PANGAEA  (12)
  • Blackwell Publishing Ltd  (4)
  • Nature Research  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Seasonal dynamics of crustacean zooplankton, heterotrophic nanoflagellates and bacteria in a shallow, eutrophic lake (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 33 (1995), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 1. The seasonal development of crustacean zooplankton, heterotrophic nanoflagellates (HNF) and bacteria was examined in Grosser Binnensee, a shallow, eutrophic lake in northern Germany. The grazing impact of Daphnia on bacteria and nanoflagellates was estimated from field data on population abundances and from clearance rates obtained in laboratory experiments.2. The seasonal succession of zooplankton showed distinct peaks of Daphnia magna, cyclopopid copepods, Bosmina longirostris and Daphnia galeata and D. hynlina. The population dynamics of Dapfinia had the strongest impact on all sestonic components. Daphnia maxima coincided with clearwater phases, and were negatively correlated with particulate organic carbon (POC), HNF and phytoplankton. Bacterial abundance was only slightly affected although daphnids were at times more important as bacterial consumers than HNF, as estimated from measured bacterial clearance rates. Other crustaceans (copepods, Bosmina) were probably of minor importance as grazers of bacteria and nanoplankton.3. HNF abundance varied from 550 ml−1 to more than 30000 ml−1. HNF appeared to be suppressed by daphnids and reached highest densities when copepods dominated the metazooplankton. The variation in HNF abundance was not reflected in the concentration of heterotrophic bacteria, which fluctuated rather irregularly between 5 and 20 ± 106 ml−1. Long filamentous bacteria which were probably resistant to protozoan grazing, however, appeared parallel to the development of HNF. These bacterial cells, although small in number, could comprise more than 30% of the total bacterial biomass.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1995.tb00383.x
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Confusing Selective Feeding with Differential Digestion in Bacterivorous Nanoflagellates (2001)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 48 (2001), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Food selectivity and the mechanisms of food selection were analyzed by video microscopy for three species (Spumella, Ochromonas, Cafeteria) of interception-feeding heterotrophic nanoflagellates. The fate of individual prey particles, either live bacteria and/or inert particles, was recorded during the different stages of the particle-flagellate-interaction, which included capture, ingestion, digestion, and egestion. The experiments revealed species-specific differences and new insights into the underlying mechanisms of particle selection by bacterivorous flagellates. When beads and bacteria were offered simultaneously, both particles were ingested unselectively at similar rates. However, the chrysomonads Spumella and Ochromonas egested the inert beads after a vacuole passage time of only 2–3 min, which resulted in an increasing proportion of bacteria in the food vacuoles. Vacuole passage time for starved flagellates was significantly longer compared to that of exponential-phase flagellates for Spumella and Ochromonas. The bicosoecid Cafeteria stored all ingested particles, beads as well as bacteria, in food vacuoles for more then 30 min. Therefore “selective digestion” is one main mechanism responsible for differential processing of prey particles. This selection mechanism may explain some discrepancies of former experiments using inert particles as bacterial surrogates for measuring bacterivory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.2001.tb00175.x
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Phenotypic variation in Pseudomonas sp. CM10 determines microcolony formation and survival under protozoan grazing (2002)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology ecology 39 (2002), S. 0 
    Details
    ISSN: 1574-6941
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: We investigated the survival mechanism of the bacterium Pseudomonas sp. CM10 in the presence of a flagellate predator. The bacterium had been isolated from a continuous culture containing bacterivorous nanoflagellates. On agar plates, we found intraclonal dimorphism of Pseudomonas sp. CM10 colonies at high frequencies: The primary mucoid colony type generated a secondary non-mucoid form. Unlike the repeated generation of non-mucoid colonies from mucoid clones, we did not observe the occurrence of mucoid forms in non-mucoid populations. In semicontinuous and batch cultures, we investigated the ability of the two morphs to survive predation by the bacterivorous flagellate Ochromonas sp. under conditions of growth and starvation. In predator-free cultures, populations of both variants were unicellular but differed in some phenotypic characteristics such as cell motility and hydrophobicity. Grazing treatments revealed that the non-mucoid morph was reduced severely whereas the primary mucoid type survived due to the formation of inert suspended microcolonies stabilized by an extracellular matrix. Effectiveness and competitive trade-offs of microcolony formation were revealed by a competition experiment with the bacterium Pseudomonas putida MM1: Pseudomonas sp. CM10 was displaced in predator-free cultures but outgrew the defenseless and monomorphic competitor under flagellate grazing pressure. We conclude that intraclonal polymorphism may regulate the ability of Pseudomonas sp. CM10 to survive in situations of severe protistan grazing. The formation of inert microcolonies, however, is suggested to be detrimental to rapid growth and dispersal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6941.2002.tb00906.x
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Rapid Daphnia-mediated changes in microbial community structure: an experimental study (2002)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology ecology 42 (2002), S. 0 
    Details
    ISSN: 1574-6941
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Shifts in morphological and taxonomical composition of bacterioplankton communities in response to protist and metazoan grazing were studied in bottle experiments, exposing bacterioplankton from a eutrophic clear-water pond, dominated by a large population of Daphnia magna, to a Daphnia gradient, ranging from 0 to 60 individuals per liter. Prior to the first experiment, the bacterioplankton community was shaped by protist grazing, while for the second experiment, bacterioplankton was pre-adapted to Daphnia grazing. In both experiments, rapid shifts in biomass and structure of the bacterioplankton community upon exposure to Daphnia grazing were observed. High Daphnia densities suppressed protozoa, resulting in a dominance of free-living bacteria. Under low Daphnia densities, heterotrophic nanoflagellates (HNF) developed as the dominant grazers and complex morphotypes (filaments, aggregates) were abundant in the bacterial community. Denaturing gradient gel electrophoresis analysis showed that taxonomical changes accompanied the morphological differences between bacterial communities shaped by HNF or Daphnia grazing. However, comparing ciliate- and Daphnia-dominated bacterial communities, we observed a discrepancy between morphological and taxonomical shifts, indicating that other traits than mere morphological ones determine vulnerability of bacterioplankton to specific grazers. Our results illustrate the rapid, pronounced and reversible impact of grazing on the morphology and taxon composition of bacterioplankton. Our results also stress that Daphnia may, already at moderate densities, have a pronounced impact on the lake bacterioplankton, both through direct grazing on the bacteria and through grazing on protozoan bacterivores.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6941.2002.tb01003.x
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    Paper (German National Licenses)
    Fulltext
  • 5
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    BARM and BalticMicrobeDB, a reference metagenome and interface to meta-omic data for the Baltic Sea (2018)
    Nature Research
    In:  Scientific Data, 5 . p. 180146.
    Details
    Publication Date: 2021-02-08
    Description: The Baltic Sea is one of the world’s largest brackish water bodies and is characterised by pronounced physicochemical gradients where microbes are the main biogeochemical catalysts. Meta-omic methods provide rich information on the composition of, and activities within, microbial ecosystems, but are computationally heavy to perform. We here present the Baltic Sea Reference Metagenome (BARM), complete with annotated genes to facilitate further studies with much less computational effort. The assembly is constructed using 2.6 billion metagenomic reads from 81 water samples, spanning both spatial and temporal dimensions, and contains 6.8 million genes that have been annotated for function and taxonomy. The assembly is useful as a reference, facilitating taxonomic and functional annotation of additional samples by simply mapping their reads against the assembly. This capability is demonstrated by the successful mapping and annotation of 24 external samples. In addition, we present a public web interface, BalticMicrobeDB, for interactive exploratory analysis of the dataset.
    Type: Article , PeerReviewed
    Format: text
    Format: archive
    DOI: 10.1038/sdata.2018.146
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 6
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    Impact of dissolved inorganic carbon concentrations and pH on growth of the chemolithoautotrophic epsilonproteobacterium GD1 (2015)
    PANGAEA
    In:  Supplement to: Mammitzsch, Kerstin; Jost, Günter; Jürgens, Klaus (2014): Impact of dissolved inorganic carbon concentrations and pH on growth of the chemolithoautotrophic epsilonproteobacterium Sulfurimonas gotlandica GD1 _T. Microbiology Open, 3(1), 80-88, https://doi.org/10.1002/mbo3.153
    Details
    Publication Date: 2023-02-24
    Description: Epsilonproteobacteria have been found globally distributed in marine anoxic/sulfidic areas mediating relevant transformations within the sulfur and nitrogen cycles. In the Baltic Sea redox zones, chemoautotrophic epsilonproteobacteria mainly belong to the Sulfurimonas gotlandica GD17 cluster for which recently a representative strain, S. gotlandica GD1T, could be established as a model organism. In this study, the potential effects of changes in dissolved inorganic carbon (DIC) and pH on S. gotlandica GD1T were examined. Bacterial cell abundance within a broad range of DIC concentrations and pH values were monitored and substrate utilization was determined. The results showed that the DIC saturation concentration for achieving maximal cell numbers was already reached at 800 µmol/l, which is well below in situ DIC levels. The pH optimum was between 6.6 and 8.0. Within a pH range of 6.6-7.1 there was no significant difference in substrate utilization; however, at lower pH values maximum cell abundance decreased sharply and cell-specific substrate consumption increased.
    Keywords: BIOACID; Biological Impacts of Ocean Acidification
    Type: Dataset
    Format: application/zip, 3 datasets
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    DATA PANGAEA
  • 7
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    Dissolved organic matter, chlorophyll a and bacterial abundance measured in water samples of POLARSTERN cruise PS111 (ANT-XXXIII/2) (2021)
    PANGAEA
    Details
    Publication Date: 2023-11-15
    Description: Global warming poses new threats to marine ecosystems since rising seawater temperature potentially induces cascading effects in biogeochemical cycles and food webs. Heterotrophic bacteria are the main producers of CO2 in the ocean, thereby counteracting the biological drawdown of CO2 by primary production. In Antarctic marine systems, low seawater temperature, and the low availability of labile organic matter are major environmental constraints on bacterial growth and degradation activity. However, temperature and the availability of resources for heterotrophic bacteria undergo considerable change induced by climate warming combined with subsequent ice melt and changes in primary productivity. This project aims to test single and combined effects of temperature and organic matter availability on Antarctic marine bacterioplankton. This data set includes biological and biogeochemical parameters measured alongside the CTD casts during the Polarstern cruise PS111 to the Weddell Sea. Samples were collected in the upper 100 m of the water column at the Eastern Weddell Sea Shelf and at the Filchner-Ronne ice shelf. Concentrations of different components of dissolved organic matter and inorganic nutrients as well as chlorophyll a concentrations and bacterial cell numbers are reported.
    Keywords: Alanine; Amino acids, dissolved; Amino acids, dissolved, Carbon; ANT-XXXIII/2; Arabinose; Arginine; Aspartic acid; Auto-analyzer (QuAAtro, Seal analytical); Grasshoff et al., 1983; Bacteria; Bottle number; Carbohydrates, dissolved combined; Carbohydrates, dissolved combined, Carbon; Carbon, organic, dissolved; Chlorophyll a; CombiBac; Cruise/expedition; CTD; CTD/Rosette; CTD-RO; DATE/TIME; Depth, bathymetric; DEPTH, water; Ecology & Environment; Event label; Flow cytometry system, Becton Dickinson, FACSCalibur; Fluorometer; Welschmeyer, 1994; Fucose; Galactosamine; Galactose; Galacturonic acid; gamma-Aminobutyric acid; Glucosamine; Glucose; Glucuronic acid; Glutamic acid; Glycine; High-performance anion-exchange chromatography coupled with pulsed amperometric detection (ICS 3000, Dionex); Engel and Händel (2011); High-temperature catalytic oxidation method (TOC-VCSH, Shimadzu) (Qian and Mopper, 1996); HPLC system (Agilent 1260); Lindroth and Mopper, 1979; Isoleucine; Kombinierte Effekte von Temperatur und Ressourcenverfügbarkeit auf den Abbau von organischem Material durch Antarktisches Bakterioplankton; LATITUDE; Lazarev Sea; Leucine; LONGITUDE; Mannose/Xylose; Microbiology; Nitrate; Nitrite; Phenylalanine; Phosphate; Polarstern; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas; PS111; PS111_101-1; PS111_10-2; PS111_12-2; PS111_123-1; PS111_131-1; PS111_132-1; PS111_137-2; PS111_140-1; PS111_14-1; PS111_16-1; PS111_17-1; PS111_22-1; PS111_28-1; PS111_33-1; PS111_37-2; PS111_40-3; PS111_47-1; PS111_51-1; PS111_58-1; PS111_62-1; PS111_68-1; PS111_74-1; PS111_82-1; PS111_89-1; PS111_9-3; Rhamnose; Sample ID; Serine; Silicate, inorganic, dissolved; South Atlantic Ocean; SPP1158; Station label; Threonine; Tyrosine; Valine; Weddell Sea
    Type: Dataset
    Format: text/tab-separated-values, 5156 data points
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    DATA PANGAEA
  • 8
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    Bacterial biomass production measured in water samples of POLARSTERN cruise PS111 (ANT-XXXIII/2) (2021)
    PANGAEA
    Details
    Publication Date: 2023-10-28
    Description: Global warming poses new threats to marine ecosystems since rising seawater temperature potentially induces cascading effects in biogeochemical cycles and food webs. Heterotrophic bacteria are the main producers of CO2 in the ocean, thereby counteracting the biological drawdown of CO2 by primary production. In Antarctic marine systems, low seawater temperature, and the low availability of labile organic matter are major environmental constraints on bacterial growth and degradation activity. However, temperature and the availability of resources for heterotrophic bacteria undergo considerable change induced by climate warming combined with subsequent ice melt and changes in primary productivity. This project aims to test single and combined effects of temperature and organic matter availability on Antarctic marine bacterioplankton. This data set includes measurements on bacterial biomass production at 0°C and 3°C measured alongside the CTD casts during the Polarstern cruise PS111 to the Weddell Sea. Samples were collected in the upper 100 m of the water column at the Eastern Weddell Sea Shelf and at the Filchner-Ronne ice shelf.
    Keywords: ANT-XXXIII/2; Bacterial production; CombiBac; CTD/Rosette; CTD-RO; DEPTH, water; Ecology & Environment; Estimated; Event label; Incorporation of 14C-leucine (Simon and Azam, 1989, http://www.int-res.com/articles/meps/51/m051p201.pdf; Simon et al. 2004, doi:10.4319/lo.2004.49.4.1035); Incubation temperature; Kombinierte Effekte von Temperatur und Ressourcenverfügbarkeit auf den Abbau von organischem Material durch Antarktisches Bakterioplankton; Lazarev Sea; Microbiology; Polarstern; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas; PS111; PS111_101-1; PS111_10-2; PS111_12-2; PS111_123-1; PS111_131-1; PS111_132-1; PS111_137-2; PS111_140-1; PS111_14-1; PS111_16-1; PS111_17-1; PS111_22-1; PS111_28-1; PS111_33-1; PS111_37-2; PS111_40-3; PS111_47-1; PS111_51-1; PS111_58-1; PS111_62-1; PS111_68-1; PS111_74-1; PS111_82-1; PS111_89-1; PS111_9-3; Sample ID; South Atlantic Ocean; SPP1158; Weddell Sea
    Type: Dataset
    Format: text/tab-separated-values, 2548 data points
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    DATA PANGAEA
  • 9
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    Dynamics of halocarbons in coastal surface waters during short term mesocosm experiments (2015)
    PANGAEA
    In:  Leibniz Institute for Baltic Sea Research, Warnemünde | Supplement to: Orlikowska, Anna; Stolle, Christian; Pollehne, Falk; Jürgens, Klaus; Schulz-Bull, Detlef (2015): Dynamics of halocarbons in coastal surface waters during short term mesocosm experiments. Environmental Chemistry, 12(4), 515, https://doi.org/10.1071/EN14204
    Details
    Publication Date: 2024-02-01
    Description: The aim of the present study was to evaluate the influence of different light quality, especially ultraviolet radiation (UVR), on the dynamics of volatile halogenated organic compounds (VHOCs) at the sea surface. Short term experiments were conducted with floating gas-tight mesocosms of different optical qualities. Six halocarbons (CH3I, CHCl3, CH2Br2, CH2ClI, CHBr3 and CH2I2), known to be produced by phytoplankton, together with a variety of biological and environmental variables were measured in the coastal southern Baltic Sea and in the Raunefjord (North Sea). These experiments showed that ambient levels of UVR have no significant influence on VHOC dynamics in the natural systems. We attribute it to the low radiation doses that phytoplankton cells receive in a normal turbulent surface mixed layer. The VHOC concentrations were influenced by their production and removal processes, but they were not correlated with biological or environmental parameters investigated. Diatoms were most likely the dominant biogenic source of VHOCs in the Baltic Sea experiment, whereas in the Raunefjord experiment macroalgae probably contributed strongly to the production of VHOCs. The variable stable carbon isotope signatures (d13C values) of bromoform (CHBr3) also indicate that different autotrophic organisms were responsible for CHBr3 production in the two coastal environments. In the Raunefjord, despite strong daily variations in CHBr3 concentration, the carbon isotopic ratio was fairly stable with a mean value of -26 per mil. During the declining spring phytoplankton bloom in the Baltic Sea, the d13C values of CHBr3 were enriched in 13C and showed noticeable diurnal changes (-12 per mil ± 4). These results show that isotope signature analysis is a useful tool to study both the origin and dynamics of VHOCs in natural systems.
    Keywords: SOPRAN; Surface Ocean Processes in the Anthropocene
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
  • 10
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    Maximum ingestion and maximum clearance rate of Nanoflagellates determined experimentally (2014)
    PANGAEA
    Details
    Publication Date: 2024-01-26
    Keywords: Biomass as carbon per individual; Clearance rate per individual; EXP; Experiment; Nanoflagellates_FEEDEXP; Taxon/taxa; Treatment: temperature; Uniform resource locator/link to reference
    Type: Dataset
    Format: text/tab-separated-values, 15 data points
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    DATA PANGAEA
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