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  • 1990-1994  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Primary production of phytoplankton at a frontal zone located at the northern slope of the Dogger Bank (North Sea) (1990)
    Springer
    Marine biology 105 (1990), S. 329-336 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In July 1988 a survey was made in the Dogger Bank area of the North Sea. As a result of wind stress the area was found to be frequently well mixed. At the northerly slope a transition zone was observed between the stratified central North Sea and the well-mixed Dogger Bank area. Low nutrient concentrations were observed in surface waters; especially for nitrate (〈0,1µM). High concentrations of phosphate (〉0,5µM), nitrate (〉1µM), ammonium (〉2µM) and silicate (〉2µM) only prevailed below the thermocline. Chlorophylla values were below 1µg l−1 near the surface. Enhanced values (up to 4µg l−1) were observed in the deeper layer at the transition zone and just below the thermocline at well-stratified locations. At the transition zone high specific C-fixation rates (up to 100 mg C mg−1 chla d−1) at the surface indicated the presence of enhanced productivity. The compensation depth for primary production was found to coincide with a specific C-fixation rate of 5 mg C mg−1 chla d−1. At greater depths, phytoplankton was only found where tidally induced vertical mixing allowed a regular exposure to higher light intensities. Storms resulted in a rapid redistribution of chlorophylla and enhancement of the C-fixation rate in the upper layer of the water column.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01344303
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Wetlands policy of the Dutch government: failure or success? (1993)
    Springer
    Hydrobiologia 265 (1993), S. 321-328 
    Details
    ISSN: 1573-5117
    Keywords: wetlands policy ; ecological objectives ; The Netherlands
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract An overview is presented of Dutch wetlands and the perspectives and threats to which they are exposed. The general environmental problems of The Netherlands are reflected in the problems with the preservation of wetlands: deterioriation of water quality is one of the main problems, directly followed by the desiccation of former wet areas. Also splitting up of larger coherent areas into smaller fragments due to infrastructural works does not favour long time existence of complete (eco)systems. The policy of the Dutch government and its different ministries towards the protection of wetlands will be described. The policy to protect the Wadden Sea and which is based on concepts of wise use and sustainability will be presented as an example of Dutch integral environmental policy for wetlands particularly. Our conclusion is that wetlands policy is tardy but successful.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00007275
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    A moorable, automated plankton sampler: comments on Lewis & Heckl (1991) (1992)
    Springer
    Hydrobiologia 245 (1992), S. 105-107 
    Details
    ISSN: 1573-5117
    Keywords: plankton ; phytoplankton ; zooplankton ; plankton sampler
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Comments on a recently described moorable, automated plankton sampler are given, mainly because it was designed to capture large zooplankton. However, the need for automatic devices for sampling phyto- and zooplankton is stressed. A new design for such a device is presented. A preliminary test was made using standard continuous-flow (auto-analyser) equipment, a cultured flagellate and formalin as a fixative.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00764770
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    Paper (German National Licenses)
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