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  • 1
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    Bacterial community composition off the coast of Mauritania and Senegal during METEOR cruise M129 (2018)
    PANGAEA
    In:  Supplement to: Bachmann, Jennifer; Heimbach, Tabea; Hassenrück, Christiane; Kopprio, Germa; Iversen, Morten Hvitfeldt; Grossart, Hans-Peter; Gärdes, Astrid (2018): Environmental Drivers of Free-Living vs. Particle-Attached Bacterial Community Composition in the Mauritania Upwelling System. Frontiers in Microbiology, 9, https://doi.org/10.3389/fmicb.2018.02836
    Details
    Publication Date: 2024-02-02
    Description: Saharan dust input and seasonal upwelling along North–West Africa provide a model system for studying microbial processes related to the export and recycling of nutrients. This study offers the first molecular characterization of prokaryotic particle-attached (PA; 〉3.0 μm) and free-living (FL; 0.2–3.0 μm) players in this important ecosystem during August 2016. Environmental drivers for alpha-diversity, bacterial community composition, and differences between FL and PA fractions were identified. The ultra-oligotrophic waters off Senegal were dominated by Cyanobacteria while higher relative abundances of Alphaproteobacteria, Bacteroidetes, Verrucomicrobia, and Planctomycetes (known particle-degraders) occurred in the upwelling area. Temperature, proxy for different water masses, was the best predictor for changes in FL communities. PA community variation was best explained by temperature and ammonium. Bray Curtis dissimilarities between FL and PA were generally very high and correlated with temperature and salinity in surface waters. Greatest similarities between FL and PA occurred at the deep chlorophyll maximum, where bacterial substrate availability was likely highest. This indicates that environmental drivers do not only influence changes among FL and PA communities but also differences between them. This could provide an explanation for contradicting results obtained by different studies regarding the dissimilarity/similarity between FL and PA communities and their biogeochemical functions.
    Keywords: Ammonium; Canarias Sea; Carbon, inorganic, particulate; Carbon, organic, dissolved; Carbon, organic, particulate; Carbon, total, particulate; Carbon/Nitrogen ratio; CTD/Rosette; CTD-RO; DEPTH, water; Description; Environment; Event label; Fluorescence; Leibniz Centre for Tropical Marine Research; Location; M129; M129_837-1; M129_840-1; M129_844-1; M129_847-2; M129_859-3; M129_873-1; M129_874-1; M129_878-2; M129_892-1; M129_893-1; M129_895-1; M129_906-1; M129_908-4; M129_919-1; M129_923-2; Meteor (1986); Nitrate; Nitrate and Nitrite; Nitrite; Nitrogen, particulate; Nitrogen/Phosphorus ratio; Oxygen; Phosphate; retained on a GFF filter; Salinity; Sample comment; Sample ID; Silicate; South Atlantic Ocean; Temperature, water; Turbidity; Uniform resource locator/link to reference; ZMT
    Type: Dataset
    Format: text/tab-separated-values, 1260 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    Temporal patterns in the acoustic presence of baleen whale species in a presumed breeding area off Namibia (2019)
    Inter-Research
    In:  EPIC3MARINE ECOLOGY PROGRESS SERIES, Inter-Research, 620, pp. 201-214
    Details
    Publication Date: 2019-07-09
    Description: The eastern Atlantic Ocean is considered to provide important breeding and wintering habitats for several migratory cetacean species. The spatio-temporal distributions and migratory behaviors of cetaceans off southern Africa are nevertheless still poorly understood. This study investigated the temporal patterns of acoustic occurrence of baleen whales in a presumed baleen whale breeding area off Namibia using passive acoustic recordings collected between November 2011 and May 2013. Our results show seasonal acoustic presence of humpback whales Megaptera novaeangliae, fin whales Balaenoptera physalus and Antarctic minke whales B. bonaerensis from November to January and from June to August. Their acoustic absence from February to May possibly indicates that most animals migrated to other areas (presumably in higher latitudes) in austral summer to feed. By contrast, Antarctic blue whales B. musculus intermedia were acoustically present throughout the recording period, indicating that part of the population remains at lower latitudes year-round. Our findings support the presumed ecological importance of the oceanic area off Namibia, providing (part of) a suitable cetacean wintering and, possibly, breeding range or migratory corridor. Furthermore, the occurrence of Antarctic blue and minke whales off Namibia, concurrent with their reported acoustic presence in high-latitude feeding areas, adds to growing evidence that baleen whale migration is not obligate but much more dynamic than has long been assumed.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Location Call Number Limitation Availability
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    PAPER (OA)
  • 3
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    Dynamic light alters the response of Chaetoceros debilis to Ocean Acidification (2014)
    In:  EPIC3Ocean Sciences Meetings, Honolulu, Hawaii, USA, 2014-02-23-2014-02-28
    Details
    Publication Date: 2019-07-16
    Description: There is increasing evidence that resource availability significantly modulates the measured effects of Ocean Acidification (OA) on marine phytoplankton. In this context, the interactive effects of OA and irradiance have been proven especially important, yet most studies have applied constant light levels only. Whether such experimental results can be extrapolated to the ocean, where light intensities are highly dynamic, is currently unknown. To investigate the potential effect of dynamic light on OA responses, we grew the diatom Chaetoceros debilis under two pCO2 (390 and 1000 µatm) and light conditions (constant and dynamic). To characterise the respective responses a variety of parameters were measured (e.g. growth, elemental composition, primary production). Our results suggest that dynamic light strongly alters the effects of OA, as high pCO2 had a beneficial effect on primary production under constant but a negative effect under dynamic light. To understand these complex interactions, we assessed the underlying processes on different levels, obtaining results from transcriptomics, photophysiology as well as carbon fixation.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
    Location Call Number Limitation Availability
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    PAPER (OA)
  • 4
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    Environmental drivers of free-living vs. particle-attached bacterial community composition in the Mauritania upwelling system (2018)
    In:  EPIC3Front. Microbiol.
    Details
    Publication Date: 2019-03-11
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Location Call Number Limitation Availability
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    PAPER (OA)
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