Abstract
Zooplankton densities up to 40 times greater than those in adjacent wateraccumulated in the lee of a small point protruding into a strong tidal current at Whitsunday Island, Queensland, Australia. The density of plankton in the lee was linearly correlated with current velocity past the point, reaching maximum concentrations at mid-flood tide and decreasing as slack tide approached. Zooplankton did not accumulate when tidal flow reversed direction. Possible mechanisms of aggregation are discussed. Mass transport of zooplankton into lees by fine-scale current patterns may be a major cause of plankton aggregation in some near-shore localities and may significantly affect the distribution of fish and benthic invertebrates.
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