Fig. 6
From: Calcium ions in the aquatic environment drive planarians to food
Calcium ions are required for and improve food intake. a. Feeding indexes of D. japonica in Kanatani water lacking calcium ions (Ca++ (−)), Kanatani water containing a low concentration of calcium ions (0.1x Ca++), original Kanatani water (1x Ca++) or Kanatani water containing excess calcium ions (10x Ca++). b. Feeding indexes of S. mediterranea under the same conditions as tested in D. japonica. n = 10; NS, not significant; *, p < 0.05; **, p < 0.01; ***, p < 0.005 (Wilcoxon test)