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  • Epiphytes  (1)
  • Freshwater snails  (1)
  • Grazing  (1)
  • decomposition  (1)
  • COMPUTERS
  • Ion-selective electrodes
  • 1990-1994  (2)
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Keywords
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Oecologia 91 (1992), S. 587-595 
    ISSN: 1432-1939
    Keywords: Freshwater snails ; Macrophytes ; Grazing ; Epiphytes ; Mutualism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary An experimental investigation under field conditions of enclosures containing freshwater pulmonate snails, the macrophyteCeratophyllum demersum and epiphytes, produced evidence of beneficial interactions.Ceratophyllum growth, measured in terms of stem length, numbers of leaf-nodes and growing tips and leaf survival was significantly enhanced in the presence of snails. This effect was attributed to the increased availability of plant nutrients of snail origin, such as phosphates and ammonia, as well as to the snails' action as “cleaning symbionts” in reducing the density of bacterial and algal epiphyton potentially deleterious to macrophytes. Principal component analysis revealed both seasonal and treatment effects of snail grazing on algal epiphyton. Small adnate algal species (e.g.Cocconeis placentula) survived grazing and benefited from the removal of larger, competitor, species. Snail densities increased in all treatments, despite high (86%) juvenile mortality. It is concluded that freshwater pulmonate snails are strong interactors in lentic habitats, enhancing the growth ofCeratophyllum and producing characterisic epiphyte communities. This benefits not only the snails, but also the plants and epiphytes that are associated with them. Thus the interactions between these component parts of the community can be considered as mutualistic.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Hydrobiologia 209 (1991), S. 133-140 
    ISSN: 1573-5117
    Keywords: short chain carboxylic acids ; decomposition ; P. planorbis ; attractant
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The changes in the concentrations of short-chain carboxylic acids in decomposing snails (Planorbis planorbis L.), incubated under different conditions (10 °C, 20 °C, aerated, non-aerated) were monitored at intervals for up to 14 days. High concentrations of acetate (up to 35 mM), propanoate (up to 2.1 mM), butanoate (up to 5.8 mM), isobutanoate (up to 2.5 mM), and isopentanoate (up to 3.9 mM) were recorded. Pentanoate was only found, at low concentrations, on one occasion. None of these acids could be detected in living snails tissues. The rate of accumulation of the acids was shown to be influenced by temperature but not by aeration. Higher concentrations of all five acids were found at the high temperature treatment (20 °C) than in the low temperature treatment (10 °C) on the ninth day but by the 14th day the converse was the case. The implications of the results to the nutritional and behavioural ecology of pulmonate snails and other freshwater aquatic invertebrates are discussed.
    Type of Medium: Electronic Resource
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