Food selectivity and diet switch can explain the slow feeding of herbivorous coral-reef fishes during the morning.

Post-hoc analysis (Tukey) showed that the difference between morning-esophagus and morning-rock and between morning-esophagus and afternoon-esophagus were highly significant (P<0.005 and P<0.008, respectively), with no significant difference between morning and afternoon on rocks and between esophagus and rocks in the afternoon ( Figure 4A ).

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