Status of the Sydney rock oyster in a disease-afflicted estuary: Persistence of wild populations despite severe impacts on cultured counterparts

Emma M. Wilkie, Melanie J. Bishop, Wayne A. O'Connor, Ross G. McPherson

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Marine diseases represent a significant threat to wild organisms and the ecosystem services they support, yet studies often consider only disease impacts to aquaculture. In eastern Australia, the Sydney rock oyster (Saccostrea glomerata) aquaculture industry is increasingly affected by outbreaks of QX disease caused by parasitic Marteilia sydneyi. The present study considered impacts of M. sydneyi infection on the structure of wild-oyster populations that are dominated by S. glomerata, but that may also include the non-native Pacific oyster, Crassostrea gigas. In the Hawkesbury River Estuary, where cultured S. glomerata has experienced up to 98% QX-induced mortality, we found that disease prevalence was comparatively low among wild S. glomerata, peaking at 14%, and annual infections did not cause seasonal patterns of mortality. Furthermore, C. gigas, a competitor of S. glomerata that is not susceptible to QX disease, was not consistently more abundant at sites with than without the parasite. Overall, our results indicated that relative to cultured counterparts, wild S. glomerata in the Hawkesbury River Estuary is minimally affected by QX disease. Nevertheless, our study showed that diseases of aquaculture stocks have the capacity to infect wild populations, and that longer-term assessment of wild populations at risk is essential.

LanguageEnglish
Pages267-276
Number of pages10
JournalMarine and Freshwater Research
Volume64
Issue number3
DOIs
Publication statusPublished - 2013

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Saccostrea glomerata
wild population
persistence
estuaries
estuary
Crassostrea gigas
rock
aquaculture
Marteilia
disease prevalence
mortality
aquaculture industry
rivers
river
biological resistance
ecosystem service
at-risk population
parasite
infection
ecosystem services

Cite this

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title = "Status of the Sydney rock oyster in a disease-afflicted estuary: Persistence of wild populations despite severe impacts on cultured counterparts",
abstract = "Marine diseases represent a significant threat to wild organisms and the ecosystem services they support, yet studies often consider only disease impacts to aquaculture. In eastern Australia, the Sydney rock oyster (Saccostrea glomerata) aquaculture industry is increasingly affected by outbreaks of QX disease caused by parasitic Marteilia sydneyi. The present study considered impacts of M. sydneyi infection on the structure of wild-oyster populations that are dominated by S. glomerata, but that may also include the non-native Pacific oyster, Crassostrea gigas. In the Hawkesbury River Estuary, where cultured S. glomerata has experienced up to 98{\%} QX-induced mortality, we found that disease prevalence was comparatively low among wild S. glomerata, peaking at 14{\%}, and annual infections did not cause seasonal patterns of mortality. Furthermore, C. gigas, a competitor of S. glomerata that is not susceptible to QX disease, was not consistently more abundant at sites with than without the parasite. Overall, our results indicated that relative to cultured counterparts, wild S. glomerata in the Hawkesbury River Estuary is minimally affected by QX disease. Nevertheless, our study showed that diseases of aquaculture stocks have the capacity to infect wild populations, and that longer-term assessment of wild populations at risk is essential.",
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Status of the Sydney rock oyster in a disease-afflicted estuary : Persistence of wild populations despite severe impacts on cultured counterparts. / Wilkie, Emma M.; Bishop, Melanie J.; O'Connor, Wayne A.; McPherson, Ross G.

In: Marine and Freshwater Research, Vol. 64, No. 3, 2013, p. 267-276.

Research output: Contribution to journalArticleResearchpeer-review

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