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  • 1
    Electronic Resource
    Electronic Resource
    Characterizing the complexity of landscape boundaries by remote sensing (1996)
    Springer
    Landscape ecology 11 (1996), S. 65-77 
    Details
    ISSN: 1572-9761
    Keywords: boundary ; covert ; landscape indices ; landscape physiognomy ; fragmentation ; diversity ; remote sensing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract This paper presents a method for characterizing the complexity of landscape boundaries by remote sensing. This characterization is supported by a new boundary typology, that takes into account points where three or more landcovers converge (i.e., convergency points or coverts). Landscape boundary richness and diversity indices were proposed and calculated over 19 landscapes in South-East Brazil. Results showed that landscape boundaries, especially convergency points, provided an enrichment in landscape pattern analysis. Landcover boundary diversities were significantly related to landcover shape: elongated riparian units had the highest values for boundary diversity and coverts proportion indices. On the other hand, landscape analysis showed that indices of shape, richness, diversity and coverts proportion provided an additional evaluation of landcover spatial distribution within the landscape.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02093740
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The impact of eutrophication on aquaticmacrophyte diversity in weakly mineralized streams in the Northern Vosges mountains(NE France) (1998)
    Springer
    Biodiversity and conservation 7 (1998), S. 1051-1068 
    Details
    ISSN: 1572-9710
    Keywords: specific richness ; diversity ; macrophyte communities ; stream ; Northern Vosges
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The relationships between water chemistry and aquatic macrophyte species were studied in an attempt to evaluate the impact of eutrophication on aquatic macrophyte diversity in weakly mineralized streams in the Northern Vosges mountains (NE France). The macrophyte specific richness and abundance increased along an upstream to downstream zonation, which was characterized by an increase in mineralization and nutrient levels. A comparison of aquatic macrophyte diversity of two streams has shown the impact of human-induced perturbations (fish-farms, domestic sewage) in such weakly mineralized and poorly buffered waters. Disturbed sites with very high nutrient loading were characterized by a low vascular plant richness and by the presence of filamentous algae. In order to preserve the floristic diversity of weakly mineralized streams, water quality should be improved, the riverbanks restored and discharges reduced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008809131487
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    Paper (German National Licenses)
    Fulltext
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