TIDAL PERIODICITY IN THE DAILY SETTLEMENT OF INTERTIDAL BARNACLE LARVAE AND AN HYPOTHESIZED MECHANISM FOR THE CROSS-SHELF TRANSPORT OF CYPRIDS

¹ University of North Carolina at Chapel Hill, Institute of Marine Sciences, 3407 Arendell St., Morehead City, North Carolina 28557

At an intertidal study site in southern California the daily settlement of barnacle cyprids (probably Chthamalus spp.) was followed during the summer of 1983. Daily settlement was not significantly cross correlated with wind speed or direction but was significantly cross correlated with the maximum daily tidal range at lags of +1 to +4 days; peak settling occurred several days before the spring tide. This pattern of settlement is nearly identical to that of the megalopa of an intertidal crab, Pachygrapsus crassipes, and this suggests that, like these megalopae, cyprids may be transported onshore in slicks over tidally forced internal waves.

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