Figure 3.

Feeding differences between types of the snail Littoraria irrorata. J-snails were collected from the host plant Juncus roemerianus; S-snails were collected from the host plant Spartina alterniflora. The total number of squares of agar-based food consumed by each snail type in a choice feeding trial with Spartina-based agar and Juncus-based agar. Consumption of Spartina tissue is indicated by the open portion of the bars; consumption of Juncus tissue is indicated by the black portion of the bars. Error bars represent + 1SE. (B) Isotopic composition of S-snails and J-snails collected from the field; light gray diamonds and dark gray circles represent mean ± SD values of δ¹³C and δ¹⁵N for J-snails and S-snails, respectively.