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  • 1995-1999  (2)
Document type
Keywords
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Phytoplankton biomass and production during late austral spring (1991) and summer (1993) in the Bransfield Strait (1999)
    Springer
    Polar biology 21 (1999), S. 11-22 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Phytoplankton biomass and productivity were measured during two cruises in the Bransfield Strait in December 1991 (D91) and January/February 1993 (J93). Strong seasonal variability in productivity values was observed due to differences in the physiological response of phytoplankton. However, although the photosynthetic capacity of phytoplankton was markedly lower in D91 [P m B =0.61 ± 0.25 mg C (mg Chla)−1 h−1] than in J93 [P m B =2.18 ± 0.91 mg C (mg Chla)−1 h−1], average water column chlorophyll values in different areas of the strait were approximately similar in D91 (49–78 mg Chla m−2) and J93 (22–76 mg Chla m−2). The spatial distribution of chlorophyll was patchy and generally associated with the influence of the different water masses that meet together in the Bransfield Strait. No correlation was found between the mixed layer depth and either the integrated chlorophyll or the productivity. Our results suggest that major phytoplankton blooms in the Bransfield Strait are advected from the nearby Gerlache Strait or Bellingshausen Sea following the main eastward surface currents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003000050328
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Large-Scale and Mesoscale Distribution of Plankton Biomass and Metabolic Activity in the Northeastern Central Atlantic (1999)
    Springer
    Journal of oceanography 55 (1999), S. 471-482 
    Details
    ISSN: 1573-868X
    Keywords: Plankton ; biomass ; metabolism ; northeast Central Atlantic
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Plankton biomass and indices of metabolism and growth [electron transport system (ETS), glutamate dehydrogenase (GDH) and aspartate transcarbamylase (ATC) activities] were studied over a 2,800 km east-west section of the tropical North Atlantic Ocean (21°N) in 〈200, 200–500 and 〉;500 µm size classes. On the large-scale, zooplankton (〉;200 µm) enzymatic activities increased westward in the study section, where large cyanobacteria chains (Trichodesmium spp.) were observed. Parallel to it, an increase in medium calanoids (1–2 mm length) was observed towards the western part of the transect, whereas small calanoids (〈1 mm) were dominant throughout the boundary area of the subtropical gyre. Microplankton ETS and mesoplankton ETS and ATC activities seemed to match the wave length of low frequency waves. Our results suggest that such waves are related to the observed enhancement of metabolic activity of micro- and mesoplankton. The large-scale and mesoscale variability observed give evidence of the inadequacy of assuming a steady-state picture of the euphotic zone of tropical and subtropical waters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007822921434
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    Paper (German National Licenses)
    Fulltext
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