Observations (% of time; mean + SEM, n = 20 except small <i>Elysia viridis</i> from <i>Codium fragile</i> and <i>Cladophora sericea</i> where n = 16 and 19 respectively) of A) large and B) small <i>E. viridis</i> individuals from different original algal hosts (<i>C. sericea</i>, <i>Cladophora rupestris</i>, and <i>C. fragile</i>) on different algal diet species (<i>Chaetomorpha melagonium</i>, <i>C. fragile</i>, <i>C. sericea</i>, and <i>C. rupestris</i>) in 40 h multiple-choice assays.

<p>Different letters above bars within each original host species indicate significant differences at α = 0.05 (Friedman's PHC). The no choice category denotes observations where <i>E. viridis</i> were not on an algal diet species, these are not included in statistical analyses.