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  • 1
    Electronic Resource
    Electronic Resource
    Protozoan communities around conifer roots colonized by ectomycorrhizal fungi (1994)
    Springer
    Mycorrhiza 5 (1994), S. 53-61 
    Details
    ISSN: 1432-1890
    Keywords: Protozoa ; Ectomycorrhizal fungi Douglas fir ; Microbial ecology ; Biodiversity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Protozoan communities around roots with different types of ectomycorrhizae were distinct. These protozoan communities differed both qualitatively and quantitatively with the host (Pinus ponderosa, Pseudotsuga menziesii, Picea sitchensis, Tsuga heterophylla and Abies grandis) and the ectomycorrhizal fungal species. Based on the species identified and the numbers of individuals of each species, six communities of protozoa were found associated with specific ectomycorrhizae. Previous researchers have shown that mycorrhizal colonization of roots alters the amounts and types of exudates produced by roots, which in turn alters the bacterial community present. Most likely, mycorrhizal colonization of roots influences the protozoan community around roots by controlling the bacterial community. However, the protozoan community may in turn influence the successional dynamics of ectomycorrhizal fungi on different host root systems by a variety of mechanisms. These mechanisms could include: (1) preying upon individuals and perhaps removing particular species of bacteria from the mycorrhizosphere; and (2) controlling nitrogen mineralization in the rhizosphere. Further work needs to be performed to determine the interaction between these quadrate (plant-bacteria-fungi-protozoa) associations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00204020
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  • 2
    Electronic Resource
    Electronic Resource
    Filter-out-grazers (FOG): A filtration experiment for separating protozoan grazers in soil (1985)
    Springer
    Biology and fertility of soils 1 (1985), S. 73-79 
    Details
    ISSN: 1432-0789
    Keywords: Protozoa ; Ciliates ; flagellates ; Nitrogen and phosphorus mineralization ; Grazing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary In the present experiment, natural protozoan fauna and other microbial components in water extracts from shortgrass prairie soil were separated on the basis of size by differential filtration (8-, 5-, and 3-μm porosities). All extracts contained bacteria and fungi, along with a few very small flagellates (3-μm pore size filtrate); flagellates and a few small amoebae (5-μm pore size filtrate); and flagellates, small amoebae, and small ciliates (8-μm pore size filtrate). All microorganisms, except a few species of flagellates, were present in the centrifuge treatment. Each filtrate was added to sterile soil, and the population of each microbial group was determined after inoculation at intervals up to 80 days (at room temperature). Populations of all added groups decreased on initial addition to soil but then increased during the incubation. By following nitrogen, phosphorus, and CO2 dynamics, we observed impacts of protozoan grazing on bacteria, including mineralization of N from microbial biomass.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00255133
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