Figure 6. Observer effects on vascular plant richness using data from 36 EMCLA sites with repeated surveys by two observers: (A) total richness comparison, (B) rare plant richness comparison, (C) total survey time comparison, and (D) total richness vs. pseudoturnover rate.

The solid lines were fitted by linear regression models, while the dashed lines were the 1:1 diagonal lines that represent no bias in sampling among observers.