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Biotic affinities of rocky reef fishes, invertebrates and macroalgae in different zones of the Port Davey marine protected area, south-western Tasmania


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Edgar, GJ and Barrett, NS 2009 , 'Biotic affinities of rocky reef fishes, invertebrates and macroalgae in different zones of the Port Davey marine protected area, south-western Tasmania' , Aquatic Conservation: Marine and Freshwater Ecosystems, vol. 20, no. 3 , pp. 282-296 , doi:

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1. Assemblages of fishes, invertebrates, and macroalgae showed strong and predictable distributional patterns
within the newly declared Port Davey marine protected area (MPA) in south-western Tasmania. Biotic
assemblages in the eastern estuarine section of the MPA within Bathurst Channel were extremely anomalous,
both in relation to biota elsewhere in the Port Davey region and also to those present along the wider Tasmanian
and Australian coasts. Much of this variation was due to the phenomenon of deepwater emergence, with species
in 5m water depth in eastern Bathurst Channel possessing a mean maximum recorded depth of 200 m, compared
witho80m for the same metric when calculated for sites studied elsewhere around Australia. Deepwater
emergence in Bathurst Channel was particularly notable for sessile organisms, although also evident among fishes
and mobile macro-invertebrates.
2. Quantitative baseline surveys of reef-associated species were undertaken at sites interspersed among MPA
management zone types and biotic community types, thereby providing an appropriate benchmark for assessing
ecological changes in different management zones within the Port Davey region through the long term.
Distinctive biota present in eastern and western Bathurst Channel, and eastern Port Davey, are well protected
within ‘no-take’ sanctuary zones; however, a bias in location of sanctuary zones towards areas with little fishery
resources resulted in less protection for the western Port Davey biota, which also extends along the open coast.
Although the lack of high level protection for sites with fishery resources detracts from conservation goals, the
Port Davey MPA nevertheless represents a major advance in environmental protection because the ecologically
unique, fully protected locations are a necessary inclusion within any comprehensive Australian MPA network.

Item Type: Article
Authors/Creators:Edgar, GJ and Barrett, NS
Keywords: deepwater emergence;effects of fishing;estuary;MPA management;World Heritage Area;wilderness
Journal or Publication Title: Aquatic Conservation: Marine and Freshwater Ecosystems
ISSN: 1099-0755
DOI / ID Number:
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