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  • Articles  (5)
  • Wetlands
  • sediment
  • 1975-1979  (5)
  • Biology  (3)
  • Energy, Environment Protection, Nuclear Power Engineering  (2)
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  • Articles  (5)
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  • Biology  (3)
  • Energy, Environment Protection, Nuclear Power Engineering  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Remote sensing of coastal food resources (1978)
    Springer
    Environmental management 2 (1978), S. 119-126 
    Details
    ISSN: 1432-1009
    Keywords: Remote sensing ; Coastal productivity ; Natural resources ; LANDSAT ; Skylab ; Wetlands
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Since tidal marshes and estuaries cover large areas of the world's coasts and exhibit a very high net primary productivity, they offer a most important food source for an ever increasing world population. The food web of numerous estuaries and coastal waters is based on the primary productivity of coastal marshes that constitute centers of solar energy fixation and an important link in the mineral cycles. The fixed carbon and minerals enterthe water primarily as detritus where a complex food web makes them accessible to commercially important fish and benthic communities. With the launch of LANDSAT, NOAA-2, and Skylab, relatively high resolution spacecraft data became available for mapping and inventorying tidal marshes and their productivity on a global scale. Upwelling regions that attract large fish populations as well as other coastal water properties relating to the presence of finfish, Crustacea, and shellfish could be identified and observed. Using multispectral analysis techniques, classification accuracies greater than 80 percent have been obtained for most marsh plant species, and greater than 90 percent for key types such asSpartina alterniflora, which is the primary producer in large tide marshes of the coastal eastern USA. The capacity of remote sensors on spacecraft such as NOAA-2, LANDSAT, and Skylab to assess coastal food resources on a global scale is discussed from the point of view of resolution, classification accuracy, and cost effectiveness.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01866238
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  • 2
    Electronic Resource
    Electronic Resource
    Land loss in coastal Louisiana (U.S.A.) (1979)
    Springer
    Environmental management 3 (1979), S. 133-144 
    Details
    ISSN: 1432-1009
    Keywords: Coastal zone Management ; Fisheries ; Marshes ; Wetlands ; Louisiana
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract This paper examines causes and consequences of wetland losses in coastal Louisiana. Land loss is a cumulative impact, the result of many impacts both natural and artificial. Natural losses are caused by subsidence, decay of abandoned river deltas, waves, and storms. Artificial losses result from flood-control practices, impoundments, and dredging and subsequent erosion of artificial channels. Wetland loss also results from spoil disposal upon wetlands and land reclamation projects. Total land loss in Louisiana's coastal zone is at least 4,300 ha/year. Some wetlands are converted to spoil banks and other eco-systems so that wetland losses are probably two to three times higher. Annual wetland losses in the Barataria Bay basin are 2.6% of the wetland area. Human activities are the principal determinants of land loss. The present total wetland area directly lost because of canals may be close to 10% if spoil area is included. The interrelationship between hydrology, land, vegetation, substrate, subsidence, and sediment supply are complicated; however, hydrologic units with high canal density are generally associated with higher rates of land loss and the rate may be accelerating. Some cumulative impacts of land loss are increased saltwater intrusion, loss of capacity to buffer the impact of storms, and large additions of nutrients. One measure of the impact is that roughly $8–17 × 106 (U.S.A.) of fisheries products and services are lost annually in Louisiana. Viewed at the level of the hydrologic unit, land loss transcends differences in local vegetation, substrate, geology, and hydrology. Land management should therefore focus at that level of organization. Proper guideline recommendations require an appreciation of the long-term interrelations of the wetland estuarine system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01867025
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  • 3
    Electronic Resource
    Electronic Resource
    The chemical environment of tubificid and lumbriculid worms according to the pollution level of the sediment (1979)
    Springer
    Hydrobiologia 65 (1979), S. 273-282 
    Details
    ISSN: 1573-5117
    Keywords: Heavy metals ; benthic fauna ; Tubificidae ; Lumbriculidae ; indicators of pollution ; sediment ; pollution ; eutrophication
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In Lake Geneva (Switzerland), 14 tubificid and 2 lumbriculid worm species were collected in a total of 170 samples of sediment. The sediment was analysed through ten chemical variables: organic carbon, total phosphorus, Cd, Zn, Sn, Pb, Hg, Cu, Cr, Mn. The chemical environment characterizing the presence of every worm species was defined by the mean value of each of these ten variables in all samples where the species was found. The multivariate comparison of the chemical environment typical of every species enabled six groups of species to be distinguished, each characterized by the high value of one chemical variable: (1) Peloscolex ferox, Potamothrix hammoniensis, Limnodrilus claparedeanus, and Cd. (2) Psammoryctides barbatus, and Zn. (3) Limnodrilus hofmeisteri, L. udekemianus, L. profundicola, and total P. (4) Potamothrix heuscheri, Aulodriluspluriseta, A. limnobius, Tubifex tubifex, Ilyodrilus templetoni, Stylodrilus heringianus, and organic C. (5) Potamothrixvejdovskyi, and, Hg. (6) Peloscolex velutinus, Stylodrilus lemani, and Mn. Pollution level of the sediment decreased from group 1 to 6, so each of these groups may be used to define a different level of pollution. The pooled coefficient of variation of the ten chemical variables used to define the chemical environment of each species diminished from group 1 to 6: the most opportunistic species colonized the most polluted areas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00038868
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  • 4
    Electronic Resource
    Electronic Resource
    Changes in phosphorus concentrations in a eutrophic lake as a result of macrophyte-kill following herbicide application (1979)
    Springer
    Hydrobiologia 66 (1979), S. 105-111 
    Details
    ISSN: 1573-5117
    Keywords: Phosphorus ; herbicide ; diquat ; nutrient cycling ; sediment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Phosphorus (P) concentrations in water and sediment of a highly eutrophic lake were monitored before and after application of diquat to control the macrophyte Potamogeton crispus. Only a relatively small and short-term increase in P concentration in water occurred shortly after plant die-off resulting from herbicide application. Phosphorus concentrations in shallow water sediments decreased during the summer, and those in deep water sediments increased. Although a large increase in P concentration in the water occurred in late summer, it was not attributed to diquat. No major secondary effects of herbicide application were found during this study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00032039
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  • 5
    Electronic Resource
    Electronic Resource
    The influence of chironomus plumosus larvae on the exchange of dissolved substances between sediment and water (1979)
    Springer
    Hydrobiologia 66 (1979), S. 149-159 
    Details
    ISSN: 1573-5117
    Keywords: Chironomus ; sediment ; exchange ; nitrogen ; phosphorus ; silica ; iron ; manganese
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract 4th instar Chironomus plumosus larvae (about 1000·m−2) were added to tubes containing sediment and overlying water. At a temperature of 20°C the larvae greatly increased the trasnport of silica, phosphorus and iron from the sediment to the water. Oxygen concentrations did not influence the exchange of silica. For two non-calcareous sediments the exchange of phosphorus and iron was much higher under anaerobic than under aerobic conditions while the difference was small for sediment from a hardwater lake. Exchange of inorganic nitrogen was little influenced by added chironomid larvae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00032045
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