TABLE 1.

Estimated total richness in E. coli populations

Source of collectionr2aGenotypesbNo. of isolates required to capture 50% of predicted genotypes (mean ± SD)d
Predicted no. (mean ± SD)cDetected
No.% of predicted
Dairy barn, December 20030.985457 ± 14477178 ± 9
Dairy holding tank, December 20030.9908158 ± 49560352 ± 19
Dairy holding tank, July 20040.991075 ± 16181127 ± 4
Swine barn, December 20030.982060 ± 15185111 ± 5
Swine holding tank, December 20030.9878104 ± 37067250 ± 14
Swine holding tank, March 20040.988670 ± 15781141 ± 6
  • a Coefficient of determination of the goodness of fit to the Michaelis-Menten equation.

  • b The number of genotypes detected in the rarefaction analyses of Figure 1 is used to estimate the percentage of total community diversity that was captured in the collection.

  • c The Vmax parameter in the Michaelis-Menten equation.

  • d The Km parameter in the Michaelis-Menten equation.