By Ronald M. Atlas (auth.), K. C. Marshall (eds.)
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Additional info for Advances in Microbial Ecology
1979, Factors affecting the number of species in freshwater protozoan communities, in: The Structure and Function of Freshwater Microbial Communities (1. C. ), pp. 219-248, Virginia Polytechnic Institute and State University, Blacksburg. Crow, V. , Jarvis, B. D. , and Greenwood, R. , 1981, DNA homologies among acid producing strains of Rhizobium, Int. J. Syst. Bacteriol. 31:152-172. , G. , 1977, The use of community diversity indices for monitoring trends in water pollution impacts, Trop.
The predator Didinium nasutum coexists in microcosms with its prey, Colpidium campylum. Prey, including Paramecium depraurelia and P. primaurelia, was limited by the quantity of bacteria and nutrients available. Didinium, an ineffective predator, was limited by the availability or quality of prey as food, or by both. Enrichment of this community with bacteria or nutrients resulted in the extinction of prey and starvation of the predator. Increasing diversity of the lower trophic level by adding alternative prey species destabilized this community, also causing extinction.
Ing to the grids, but there was little evidence of this when the grids were examined following 24-hr incubation. After a period of incubation, one might expect that patchiness would occur due to reproduction of attached organisms resulting in the formation of microcolonies. Such was the case, but this patchiness was taken into account by determining the diversity index for clones (including single-cell microcolonies), rather than for individuals. The other assumption was that the total number of species on the grid was known at each time interval, but the total number of species attached to the grids is impossible to determine.