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  • 1
    Electronic Resource
    Electronic Resource
    Changes in respiration rate and some physicochemical properties of soil during gut transit through Allolobophora molleri (Lumbricidae, Oligochaeta) (1993)
    Springer
    Biology and fertility of soils 15 (1993), S. 185-188 
    Details
    ISSN: 1432-0789
    Keywords: Allolobophora molleri ; Earthworms ; Physicochemical factors ; Gut content ; Mutualistic digestion ; Respiration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Some physicochemical and biological measurements were carried out on the gut content and casts of Allolobophora molleri, an earthworm which lives in humid soils of Northern Spain. In the anterior part of the gut, water (22% of moist weight of soil) and soluble organic matter (27.4%) had been added to the ingested soil and pH had increased from 5.75 to 7.0. The amount of water-soluble compounds decreased sharply in the middle and posterior parts of the gut and were hardly detectable in control soil or casts. The average O2 consumption, measured at 28° and 21°C, indicated respectively 2.75-to 12-fold increases in microbial respiration in the gut content compared to the non-ingested soil. These results extend the hypothesis of a mutualistic digestion in earthworms previously proposed for tropical endogeic species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00361609
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Mutualism and biodiversity in soils (1995)
    Springer
    Plant and soil 170 (1995), S. 23-33 
    Details
    ISSN: 1573-5036
    Keywords: digestion ; earthworms ; exudates ; microfoodwebs ; microflora ; mucus ; priming effect ; roots ; soil fauna ; termites
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Most soil invertebrates and roots have developed strong interactions with micro-organisms to exploit the organic and mineral resources of soil. Micro-fauna are mainly predators of microorganisms whereas larger organisms interact with micro-organisms through the “external rumen” or facultative endosymbiotic digestive systems. Mobilisation of nutrient and organic resources through mutualism with soil microflora seems to be all the more efficient as the organisms are large (like e.g., roots, termites or earthworms) and temperature is high. In the humid tropics, part of the existing species richness may have originated from an increased base of resources resulting from the development of mutualistic relationships. Evidence for this process is given for earthworm communities. Consequences for soil function and the species richness of plants and consumers are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02183052
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    Paper (German National Licenses)
    Fulltext
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