Abstract
Laboratory experiments tested the short‐term, sex specific emigration response of the infaunal amphipod Rhepoxynius abronius (Barnard) to intraspecific density. Emigration of amphipods from the sediment into the water column increased monotonically with greater test densities. A significantly higher percentage of amphipods emigrated at a density equivalent to 16,000 m2 than at a density of 4,000 m2. No significant difference in the emigration behaviour of males and females was detected. These results suggest that there is a strong selective advantage for R. abronius to avoid high densities of potential competitors and offer one explanation for the occurrence of these amphipods and perhaps other infauna in the water column.
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