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Fig. 6.3. Hypothesized relationships of microbial community structure to the texture and moisture
content of different soils.
acid (2,4-D)-degrading Sphingomonas sp. isolated from an agroecosystem
study site (Ka et al ., 1994) for use in our microcosm studies. Our initial
experiments have focused on two microbial species in competition for a
single nutrient in uniform clean sand. Each species is easily distinguished
by colony morphology, and in liquid culture and saturated sand (low spatial
isolation) one of the strains dominates because of a shorter lag time and
superior growth rate. However, as the level of spatial isolation increases,
because of decreasing moisture, we have observed that the population
sizes of the two species become nearly equal. These results mimic the
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