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  • 1990-1994  (14)
Document type
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Build-up and decline of summer phytoplankton biomass in the eastern Weddell Sea, Antarctica (1994)
    Springer
    Polar biology 14 (1994), S. 413-422 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The seasonal development and decline of phytoplankton was investigated in the eastern Weddell Sea during summer and fall 1991. During the first half of the study (15 Jan–13 Feb) in an area off Vestkapp, favourable irradiance/mixing regimes initiated net phytoplankton growth in ice-free waters on the shelf and in stretches of open water over the partially ice-covered deep ocean. Chi a concentrations in the upper water column were moderate (0.2–0.8 μg l−1), but significantly above winter values. Later in the season (16 Feb–11 March), a phytoplankton bloom with surface Chl a concentrations ranging from 1.6–2.3 μg l−1 was encountered in an area further to the east. We suggest that the upper water column must have been stratified in this region for time scales of weeks to faciliate bloom development. Bacterial biomass and productivity generally paralleled the seasonal development of the phytoplankton. Nitrate concentrations in the upper mixed layer were substantially lower than would be expected from the existing phytoplankton standing stock, suggesting that heterotrophic consumption of organic matter by bacteria and zooplankton removed a large fraction of the primary production. The shallow seasonal pycnocline was eventually eroded by the passage of a storm, resulting in a homogeneous distribution of phytoplankton biomass over the entire water column, followed by sedimentation and deposition of phytodetritus on the sea floor. After the storm induced destratification, bacterial productivity was particularly high, amounting to more than half of the primary production (range: 10%–120%) in the upper water column. Subsequently, phytoplankton biomass in the upper water column decreased to values 〈1 μg Chl a l−1. The combination of low incident irradiances and incessant deep mixing prevented the phytoplankton biomass to increase again. During the last week of the investigation, extensive new-ice formation was observed. A major fraction of the residual surface plankton was incorporated into new sea ice, thus terminating the pelagic growth season of the phytoplankton in the eastern Weddell Sea.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00240262
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Plankton succession and carbon cycling at 47°N 20°W during the JGOFS North Atlantic Bloom Experiment (1993)
    Elsevier
    In:  Deep Sea Research Part II: Topical Studies in Oceanography, 40 (1-2). pp. 91-114.
    Details
    Publication Date: 2018-03-05
    Description: An overview is given of the multinational investigations carried out at 47°N 20°W for the period 24 April–31 May, with the main emphasis on the succession of plankton communities and the flux of organic carbon through various plankton components. The depth of the upper mixed layer decreased rapidly after 25 April, triggering the start of the spring bloom that developed within a 2-week period. Chlorophyll a stocks integrated to 80 m water depth reached peak concentrations during the first 10 days in May. The observed decline was partly due to the seasonal development, but also may have been influenced by changes in water masses associated with a cyclonic eddy. Primary production ranged from 50 to 150 mmol C m−2 day−1 with highest values in the first half of May. After the first bloom phase, dominated by diatoms, nanophytoplankton gained more importance as primary producers when silicate was depleted. Stocks of bacteria, microzooplankton and mesozooplankton increased in the second half of May. Bacterial production averaged 30% of primary production and probably metabolized a large amount of dissolved organic carbon (DOC) per day, but due to uncertain carbon conversion efficiencies total bacterial carbon consumption is difficult to estimate. Largely daily changes in the DOC standing stock could not be reconciled with the measured primmary production and are probably an expression of spatial rather than temporal variations. Microzooplankton was found to consume around 64% of primary production in the second half of May. Grazing estimates for mesozooplankton varied but seem to be small (〈5% of primary production) for most of the investigation period. The small mesozooplankton size classes (〈1 mm) dominated biomass and grazing. Vertical particulate organnic carbon (POC) flux measured by sediment traps in 150 m depth was around 9.8 mmol C m−2 day−1 representing approximately 11% of primary production. The spring bloom pulse of particle flux reached the deep ocean and benthos 4–6 weeks after the surface water peak.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/0967-0645(93)90008-B
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Open ocean pelago-benthic coupling: cyanobacteria as tracers of sedimenting salp faeces (1993)
    Elsevier
    In:  Deep Sea Research Part I: Oceanographic Research Papers, 40 (4). pp. 727-737.
    Details
    Publication Date: 2019-09-23
    Description: Coupling between surface water plankton and abyssal benthos was investigated during a mass development of salps (Salpa fusiformis) in the Northeast Atlantic. Cyanobacteria numbers and composition of photosynthetic pigments were determined in faeces of captured salps from surface waters, sediment trap material, detritus from plankton hauls, surface sediments from 4500–4800 m depth and Holothurian gut contents. Cyanobacteria were found in all samples containing salp faeces and also in the guts of deep-sea Holothuria. The ratio between zeaxanthin (typical of cyanobacteria) and sum of chlorophyll a pigments was higher in samples from the deep sea when compared to fresh salp faeces, indicating that this carotenoid persisted longer in the sedimenting material than total chlorophyll a pigments. The microscopic and chemical observations allowed us to trace sedimenting salp faeces from the epipelagial to the abyssal benthos, and demonstrated their role as a fast and direct link between both systems. Cyanobacteria may provide a simple tracer for sedimenting phytodetritus.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/0967-0637(93)90068-E
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    Plankton succession and carbon cycling at 47 N 20 W during the JGOFS North Atlantic Bloom Experiment (1993)
    In:  EPIC3Deep-Sea Res II, 40, pp. 91-114
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
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    PAPER (OA)
  • 5
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    Open ocean pelago-benthic coupling cyanobacteria as tracers of sedimenting salp faeces (1993)
    In:  EPIC3Deep-Sea Res, 40, pp. 727-737
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
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  • 6
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    Microbial response to the input of fresh detritus to the deep-sea bed (1990)
    In:  EPIC3Geochemical variability in the oceans, ice and sediments (L D Labeyrie, C Jeandel, eds ) Palaeogeography, Palaeoclimatol, Palaeoecol, Global Planetary Change Section, 89, pp. 3-23
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
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  • 7
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    Protozoa as makers and breakers of marine aggregates (1991)
    In:  EPIC3Protozoa and their role in marine processes (P C Reid, C M Turley, P H Burkill, eds ) NATO ASI series, Springer, Berlin,G25, pp. 327-346
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Book , peerRev
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  • 8
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    Bacterial standing stock and consumption of organic carbon in the benthic boundary layer of the abyssal North Atlantic (1992)
    In:  EPIC3Deep-sea food chains and the global carbon cycle (G T Rowe, V Pariente, eds ) Kluwer, Dordrecht, pp. 1-10
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Book , peerRev
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  • 9
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    Mikrobiologie von Tiefseesedimenten (1993)
    In:  EPIC3Mikrobiologie des Meeresbodens (Meyer-Reil, Köster, eds) G Fischer, Jena, pp. 258-282
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Book , peerRev
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  • 10
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    Phytodetritus on the deep-sea floor in a central oceanic region of the northeast Atlantic (1990)
    In:  EPIC3Biol Oceanogr, 6, pp. 203-239
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
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