These are field data from Moorea, French Polynesia regarding the population dynamics of Diadema savignyi. Data were collected during the austral winters in 2009 and 2010. Four datasets are provided: (1) recruitment data of Diadema savignyi over the course of ~9 weeks during the austral winter of 2010, (2) predation data of adult Diadema using a tethering experiment, (3) urchin abundance surveys for 2009 and 2010, and (4) a 9 week weekly survey of newly recruited Diadema (test diameter). These data are part of a PhD dissertation, "Herbivore Community Dynamics and Functional Compositions in Moorea, French Polynesia", 2014, published by ProQuest.