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  • 1
    Electronic Resource
    Electronic Resource
    Parameters of light-dependent photosynthesis for phytoplankton size fractions in temperate estuarine and coastal environments (1981)
    Springer
    Marine biology 61 (1981), S. 289-297 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Photosynthetic parameters for netplankton (〉22 μm) and nanoplankton (〈22 μm) varied over similar ranges but exhibited different seasonal and geographic patterns of variation. Nanoplankton a was relatively constant (0.06 mg C [mg Chl · h]-1 [μE m-2 s-1]-1), but P m B (mg C [mg Chl · d]-1) was an exponential function of temperature independent of nutrient concentration and vertical stability in the euphotic zone. The temperature function gives a P m B of 24 at 25°C for nanoplankton growing in an estuarine environment characterized by high nutrient concentrations and a shallow, stratified euphotic zone. Variations in netplankton a and P m B were less predictable and were not correlated with temperature, nutrients or vertical stability. Chain forming diatoms with small cells were able to achieve high α (0.10 to 0.15) and P m B (20 to 24) that were 3 to 5 times higher than large-celled diatoms and dinoflagellates were able to achieve.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00401568
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Light-saturated photosynthesis by phytoplankton size fractions in the New York bight, USA (1977)
    Springer
    Marine biology 42 (1977), S. 281-292 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The relationships between netplankton and nanoplankton assimilation numbers, temperature, and major nutrient concentrations were studied and evaluated in the context of seasonal patterns in the biomass of these phytoplankton size fractions. Netplankton and nanoplankton blooms typically occur during late winter (2° to 8°C) and summer (18° to 24°C), respectively. Variations in nanoplankton and netplankton assimilation numbers were not statistically related to the development or collapse of specific blooms based on weekly sampling, but assimilation numbers were higher during the bloom periods than during transition periods of rapid temperature change (8° to 18°C). Differences in the assimilation numbers between size fractions could account for the dominance of the nanoplankton fraction during the summer bloom period but not for the dominance of netplankton during the winter bloom period. Nanoplankton and netplankton assimilation numbers were exponential functions of temperature between 8° and 24°C and 8° and 20°C, respectively. Below 8°C the assimilation numbers of both fractions were higher than expected on the basis of temperature. Above 20°C netplankton assimilation numbers declined with temperature. Netplankton and nanoplankton assimilation numbers were occasionally correlated with dissolved inorganic nitrogen concentrations from less than 1.0 to more than 15 μg-at l-1. Under these conditions, nanoplankton growth rates (calculated from assimilation number and carbon:chlorophyll) were higher and increased more rapidly with dissolved inorganic nitrogen than netplankton growth rates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00402190
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of silicate depletion on photosynthesis by diatoms in the plume of the Hudson River (1980)
    Springer
    Marine biology 58 (1980), S. 197-204 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Silicate depletion was observed during a bloom of netplankton diatoms. Netplankton chlorophyll a increased over the same salinity range and at the same rate that silicate decreased. Silicate depletion coincided with a decrease in the apparent Si:N uptake ratio as well as a change in the magnitude and diurnal phasing of light saturated photosynthesis (P m B ) by netplankton diatoms. Nanoplankton P m B was unaffected by silicate depletion and increased with temperature. Consequently, nanoplankton P m B eventually exceeded netplankton P m B while netplankton biomass was still increasing relative to nanoplankton biomass.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00391876
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Diurnal rhythms in netplankton and nannoplankton assimilation ratios (1971)
    Springer
    Marine biology 10 (1971), S. 285-289 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Surface nannoplankton and netplankton photosynthetic rates and chlorophyll a concentrations were measured 3 h before and 3 h after local apparent noon at 36 stations in the eastern Pacific. Morning and afternoon nannoplankton and netplankton photosynthetic capacities were plotted against chlorophyll a concentrations. Comparison of am (morning) and pm (afternoon) regression coefficients revealed that neither netplankton nor nannoplankton photosynthetic efficiencies varied diurnally in temperate California Current waters. However, in oligotrophic tropical surface waters where the photosynthetic rates of both fractions were nitrogen limited, netplankton assimilation ratios exhibited an afternoon maximum, while nannoplankton efficiencies exhibited a morning maximum. The netplankton followed the same pattern in eutrophic tropical surface waters with high nitrate concentrations, but nannoplankton assimilation ratios were highest in the afternoon. Assuming that midday light intensities inhibit surface photosynthesis, it was concluded that assimilation ratios will reach a mid-morning or mid-afternoon maximum depending upon the relative importance of netplankton and nannoplankton productivity and the degree to which nutrients are limiting.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00368086
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  • 5
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    Unknown
    Annotated record of the detailed examination of an Mn deposit surveyed in the North Atlantic Ocean (R/V Robert Conrad, Cruise 15) (1973)
    PANGAEA
    In:  Supplement to: Amos, A F; Garside, Christopher; Gerard, Robert D; Levitus, Sydney; Malone, T C; Paul, Allen Z; Roels, Oswald A (1973): Study of the impact of manganese nodule mining on the seabed and water column. In: Phase I Report - Inter-University Program of Research on Ferromanganese Deposits of the Ocean Floor. Seabed Assessment Program, International Decade of Ocean Exploration, National Science Foundation, Washington D.C., USA, 221-264, hdl:2027/wu.89033915380
    Details
    Publication Date: 2023-08-28
    Description: he proposed mining of ferromanganese deposits from the deep sea will affect benthic and pelagic environments depending to a great extent on the method of nodule retrieval and separation. Three basic deep-ocean mining systems have been proposed, each of which will effect the removal under varying conditions of water, sediment and nodules from the ocean floor. This report summarizes existing oceanographhic information on potential manganese nodule mining areas at the date of publication and presents the results of field observations in a manganese nodule area of the North Atlantic Ocean surveyed during Cruise 15 of the R/V Robert Conrad.
    Keywords: Atlantic Ocean; Comment; Deposit type; DEPTH, sediment/rock; Description; File name; Identification; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; Photo/Video; Position; PV; Quantity of deposit; RC15; RC15-180C; Robert Conrad; Sediment type; Station 222; Uniform resource locator/link to image; Visual description
    Type: Dataset
    Format: text/tab-separated-values, 9 data points
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    DATA PANGAEA
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