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Thresholds for tracing ships' ballast water: an Australian case study

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dc.contributor.author Doblin, Martina A. en
dc.contributor.author Murphy, Kathleen R. en
dc.contributor.author Ruiz, Gregory M. en
dc.date.accessioned 2012-02-28T18:15:23Z
dc.date.available 2012-02-28T18:15:23Z
dc.date.issued 2010
dc.identifier.citation Doblin, Martina A., Murphy, Kathleen R., and Ruiz, Gregory M. 2010. "<a href="https://repository.si.edu/handle/10088/18090">Thresholds for tracing ships&#39; ballast water: an Australian case study</a>." <em>Marine Ecology Progress Series</em>. 408:19&ndash;32. <a href="https://doi.org/10.3354/meps08599">https://doi.org/10.3354/meps08599</a> en
dc.identifier.issn 0171-8630
dc.identifier.uri http://hdl.handle.net/10088/18090
dc.description.abstract To limit the spread of non-indigenous marine species, ships can be legally required to conduct ballast water exchange (BWE) prior to discharging ballast water. It has been proposed to verify BWE by measuring concentrations of coastal tracers in ballast tanks, which should track their removal. Using 3 Australian ports as case studies (Port Botany, Port Curtis and Port Phillip Bay), each representing a different BWE verification difficulty level, the spatial and temporal variability of chromophoric dissolved organic matter (CDOM) and 3 trace elements (manganese [Mn], barium [Ba] and phosphorus [P]), were measured to assess their utility as tracers of coastal (unexchanged) ballast water. CDOM fluorescence at lambda(ex)/lambda(em) = 320/414 nm (C2*) and 370/494 nm (C3*) and Mn concentrations were significantly higher in ports than in the adjacent Tasman Sea, except near port entrances and at a few sites in Port Botany. Ba concentrations demonstrated the least power to discriminate coastal sources, but P easily discriminated water from mesotrophic Port Phillip Bay. In general, tracers showed greater variation between and within ports, rather than between seasons. Conservative BWE thresholds were calculated to be 1.6 quinine sulphate equivalents for C2*, 0.9 quinine sulphate equivalents for C3*, 1.4 mu g l(-1) for Mn and 6.9 mu g l(-1) for Ba. Overall, these thresholds would allow water sourced from eastern Australian ports to be identified as coastal at 92%, 69% and 74% of sites examined using C3*, Mn and Ba, respectively, requiring 71 +/- 26%, 54 +/- 40% and 59 +/- 38% replacement with mid-ocean water to be within ocean baseline concentration ranges. en
dc.relation.ispartof Marine Ecology Progress Series en
dc.title Thresholds for tracing ships&#39; ballast water: an Australian case study en
dc.type Journal Article en
dc.identifier.srbnumber 89591
dc.identifier.doi 10.3354/meps08599
rft.jtitle Marine Ecology Progress Series
rft.volume 408
rft.spage 19
rft.epage 32
dc.description.SIUnit SERC en
dc.citation.spage 19
dc.citation.epage 32

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