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  • 1
    Electronic Resource
    Electronic Resource
    Biomanipulation: a useful tool for freshwater wetland mitigation? (2003)
    Oxford, UK : Blackwell Science Ltd
    Freshwater biology 48 (2003), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 1. Natural wetlands have traditionally been considered as efficient ‘ecological engineers’ for waste water treatment. However, the structure and function of many natural wetlands have been severely altered by the chronic exposure to pollutants, especially nutrients.2. Despite the similarity of symptoms of eutrophied shallow lakes and wetlands, restoration strategies differ distinctly between these rather similar aquatic systems. Many of the tools applied in shallow lake restoration programs, for example biomanipulation, have received little attention in wetland management and restoration.3. Although a strong conceptual basis for food web management exists, biotic interactions as influences on wetland communities have been largely neglected by wetland scientists and managers.4. In this paper we show that biomanipulation may have a strong potential for wetland eutrophication abatement. This potential will be demonstrated by reviewing studies carried out in different wetland types in contrasting climatic regions.5. We propose four different scenarios for when, where and why biomanipulation may be used to rehabilitate freshwater wetlands. These scenarios reflect different settings of hydrological variability, eutrophication sources and gradients of wind exposure and water colour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2427.2003.01156.x
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  • 2
    Electronic Resource
    Electronic Resource
    Life-cycle studies and culture experiments for identification of doubtful volvocacean organisms – observations on Pandorina and Eudorina (1998)
    Springer
    Hydrobiologia 369-370 (1998), S. 269-275 
    Details
    ISSN: 1573-5117
    Keywords: Pandorina ; Eudorina ; identification problems ; life cycles ; culture experiments
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Traditionally, the volvocacean genera Pandorina and Eudorina are distinguished by vegetative morphology: Eudorina has hollow coenobia with loosely arranged spherical to ovoid cells, whereas Pandorina coenobia are compact with pear- to keystoneshaped cells contiguous in the centre. However, sometimes intermediate forms are found which cannot be identified to genus by traditional morphological characters. Especially the degree of compactness of Pandorina coenobia may be highly variable. Such abberant forms must be taken into culture in order to establish their identity, by studying (1) their life cycles, both sexual and asexual processes, and (2) the influence of varied culture conditions (temperature, daylenght, nutrients) on their morphology. In these ways, the taxonomic position may be clarified.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017002027319
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    Paper (German National Licenses)
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