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Effects of oyster farming service vehicles on an intertidal sand flat


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MacLeod, CK, Forbes, SE, Shepherd, C and Crawford, CM 2009 , 'Effects of oyster farming service vehicles on an intertidal sand flat' , Aquaculture Research, vol. 40 , pp. 772-780 , doi: 10.1111/j.1365-2109.2008.02156.x.

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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.

Item Type: Article
Authors/Creators:MacLeod, CK and Forbes, SE and Shepherd, C and Crawford, CM
Keywords: vehicle impacts, intertidal ecology, benthic macrofauna, shellfish aquaculture
Journal or Publication Title: Aquaculture Research
ISSN: 1355-557X
DOI / ID Number: 10.1111/j.1365-2109.2008.02156.x
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