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  • Phragmites  (1)
  • classification  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Impact of hydrodynamic changes on the zonation of helophytes (1996)
    Springer
    Aquatic ecology 30 (1996), S. 165-173 
    Details
    ISSN: 1573-5125
    Keywords: helophytes ; Phragmites ; Scirpus ; water level ; wave exposure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Water movement has a strong impact on the development and persistence of helophyte stands along large water bodies. The decline ofScirpus andPhragmites stands in the Rhine-Meuse estuary (The Netherlands), due to changed hydrodynamic conditions (reduced tidal action, increased shoreline erosion), illustrates the effects of large-scale hydrological regulation. Hydrodynamic factors partly explain the distribution and composition of helophyte vegetation bordering the open water. A vertical zonation emerges during the stages of dispersal, germination, seedling establishment and adult growth of the plants. Differences between species may result in the occupation of different water-depth zones. Additionally, gradients of wave exposure result in a horizontal zonation along water bodies. Restrictions to helophyte development due to the hydrological regime and wave attack should be taken into account in wetland restoration studies. Water-level management, instead of a strict control of water levels, should be one of the key elements of water management in the future.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02272236
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  • 2
    Electronic Resource
    Electronic Resource
    Classification of Danube Delta lakes based on aquatic vegetation and turbidity (1999)
    Springer
    Hydrobiologia 415 (1999), S. 187-191 
    Details
    ISSN: 1573-5117
    Keywords: submerged macrophytes ; lakes ; classification ; eutrophication ; remote sensing ; transparency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The aquatic vegetation present in lakes in the delta of the River Danube was studied using field survey data and satellite image. Based on the spectral information from satellite images, three categories of lakes were distinguished: clear / macrophyte-dominated, intermediate and turbid / poorly vegetated. The satellite-based classification was consistent with vegetation cover and water transparency measured in the field. Cluster analysis of vegetation data from 235 relevés made in 22 lakes (1996-1998, each year in June) identified ten submerged vegetation types. The lakes were characterised by the frequency of occurrence of each vegetation type and ordinated, using Principal Components Analysis (PCA). A strong relationship appeared between the composition and density of aquatic vegetation and water transparency. Isolated lakes within the extensive beds of floating reed (plaur lakes) formed a separate group. Based on the ordination analysis, connectivity of lakes in the Danube Delta was concluded to be a major factor for the development of dense macrophyte vegetation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003856927865
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