Abstract
Laboratory experiments demonstrated that Orchestoidea corniculata, a sand-beach amphipod, can orient to slopes of only 3°. Studies suggest they reach the upper interdial zone where they burrow by moving up a wet slope or down a dry slope. When they emerge from the sand at night, however, they either reverse this response or show no response to slope. This behaviour, enhanced by a preference for wet, surface sand, would account for the initial seaward movement observed in the field. Behavioural variations among differing segments of the population were investigated. Three additional beach inhabitants oriented to slope, thus indicating the mechanism of slope orientation as a possible generalization in the beach habitat.
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