Pollinator visitation to, and the reproductive success of, Sonneratia caseolaris (Sonneratiaceae) and
Aegiceras corniculatum (Myrsinaceae) was investigated in a mangrove forest in India. S. caseolaris was shown to be
primarily outcrossed and A. corniculatum was shown to be a selfing species. The flowers of both plant species attracted
several diurnal and nocturnal visitors. Earlier reports had indicated that S. caseolaris flowered for one night and was
exclusively night-pollinated. But flowers of this species were found to be in bloom both at night and during the day,
and diurnal visitors to the flowers were more diverse and frequent than nocturnal ones. This was related to the higher
volume and energy value of nectar in the morning. The effects of time of day and temperature on visitation rates were
quantified. The importance of visitors to plant reproductive success was investigated via controlled visitor-exclusion
experiments. Pollinators were expected to be more important for the outcrossing species than for the selfing species,
and this was confirmed by the results of the exclusion experiments. In S. caseolaris reproductive success was
determined both by pollinator availability and the intensity of flower and fruit predation, while in A. corniculatum it is
likely to be resource limited.