However, predation seems to have major effects at both the local and metacommunity scale. Further, we show that dispersal affects richness at the local community scale but not at the metacommunity scale. Our results support all three hypotheses. ![]() We hypothesized that: (1) increased basal resources should maintain greater species richness and higher predator abundance (2) dispersal should maintain greater species richness and (3) predation should reduce species richness, especially in the high resource treatments relative to no-predator treatments. caudatum, Philodina sp., Spirostomum sp., Tetrahymena thermophila, and Uronema sp., and Stentor coeruleus was the predator used. Prey species included: Chilomonas sp., Colpidium striatum, Colpoda cucullus, Paramecium tetraurelia, P. ![]() We conducted a laboratory experiment using a microbial model system to disentangle effects of nutrient enrichment, dispersal, and predation on prey species richness and predator abundance at local and metacommunity scales. Community structure is the observable outcome of numerous processes.
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