Timing of Activity Patterns
Itis well known that these urchins are more active at night, and many hide in crevices during the day (Ogden 1973).However,bright light may be tolerated (Ogden 1973). In his report, (1973) observed that the activity cycle of Diadema antillarum begins from 1500 to 1800 hours and continue to peak at 2400 to 0300 hours; daytime inactivity is fully established at 0600. At the time of his report, John C. Ogden(1973) reported that theanimals were often seen in fair number exposed during the day in shallllow water in Bermuda.