Effects of oyster farming service vehicles on an intertidal sand flat

Abstract

A Tasmanian tidal£at receiving di¡ering amounts of vehicle tra⁄c associated with the servicing of oyster farm leases was sampled for sediment properties and benthic community structure.There was a gradient of vehicle usage in both the littoral zone (LZ) and the intertidal zone (IZ), with the highest usage in the intertidal zone equating to the lowest usage in the littoral zone (IZ25LZ1). Results indicate that the littoral sediments were less compacted where vehicles were present. Species richness and diversity were reduced in the littoral sites (70%) and one intertidal site (50%) where there was vehicle tra⁄c. Multivariate analyses con¢rmed the univariate ¢ndings. Large bivalves and epibenthic snails were generally less abundant where there was vehicle tra⁄c. However, in the intertidal zone one snail showed the opposite pattern. There was less change in the community structure at sites where vehicles spread out across the foreshore than at sites where all vehicles travelled in a narrow lane, but this reduction in impact was o¡set by a greater area being a¡ected. This study provides preliminary evidence of a measurable impact on sediment and community composition at 16 vehicle trips per day and suggests that management needs to consider the tradeo¡ between magnitude of impact and area a¡ected.