Abstract
The densities of intertidal invertebrates in areas within and outside the hovercraft flightpath were compared by analysis of variance and least significant range tests. No evidence was found to suggest that the hovercraft had significantly reduced the density of invertebrates in the flightpath area. Only five species groups ( Nereis diversicolor, Spionid spp., Bathyporeia spp., Macoma balthica and Arenicola marina) had significantly different densities between areas, and in each case there was a density gradient alongshore. In three species groups (Spionid spp., Bathyporeia spp. and Macoma balthica) density was related to the percentage of fine sand (4–5 φ) at each site.
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