Barnacle recruitment was estimated using resin recruitment plates. The plates were 2 circular, 7 cm in diameter (38.5 cm area), and # 1 cm in height. Each plate was cast in fiberglass resin from molds of granite rock to mimic the natural rugosity of the granite in the intertidal zone on Swans Island . During 28–30 March 1998 we secured a plate in each replicate plot using stainless steel screws