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We present data from 2 studies on San Nlcolas Island, Cahfornia, USA. First, we document changes in distribution and abundance of the Island's American black oystercatcher Haematopus bachmam population. As the oystercatcher population increased exponentially, the birds used more of the Island's rocky intertidal communities for feeding and roosting during winter and spring. Second, we document differential predation on members of a herbivorous hmpet gulld (primarily Collisella spp. ) by a wintenng flock that expanded lnto a previously unexplolted portion of the island. For 4 of the 5 prey specles (Colhsella digitalis, C. scabra, C. Lrmatula, Lottia gigantea) there was evidence for differential predation, elther selection or avoidance, by the oystercatchers. However, no slngle causal mechanism explans the pattern for all 4 specles. The combined phenomena of variation in oystercatcher distnbution in space and time and differential predation on members of the patellacean limpet gulld may have important imphcahons for the ecology of rocky intertidal communities.

Prey preference and seasonal predation by oystercatchers on limpets at San Nicolas Island, California, USA