Figure 6.

Effects of plant community composition and snail type on the overall change in plant stem height in the (A) presence and (B) absence of a predator over the course of a 12-week mesocosm experiment. (A) When predators were present, the effects of snails differed by snail type in the Spartina-only community. (B) When predators were absent, the differential effects of the two snail types were reduced. In addition, the negative effect of J-snails on plant height in the presence of predators disappeared when predators were absent in the mixed community. Letters indicate significant differences at P < 0.05 based on Tukey’s post hoc tests. Bars represent means ± 1SE.