Before revision:  Using an example of 7 Bacteroides species utilizing 9 polysaccharides common to the human gut  , we predict that mutual complementarity in nutrient preferences enables these species to coexist at high abundances.
After revision:  Using an example of 7 Bacteroides species utilizing 9 polysaccharides common to the human gut utilizing 9 polysaccharides , we predict that mutual complementarity in nutrient preferences enables these species to coexist at high abundances.