highly significantp < 0.0001
Marble burying was strikingly increased by both treatments and two-way ANOVA revealed a highly significant effect of time (F = 49.16, df 1,47 p < 0.0001) and treatment (F = 12.67, df 2,47 p < 0.0001) and a significant time X treatment interaction (F = 12.67, df 2,47 p < 0.0001) (Fig. 6D ).