Dietary ingestion of fine sediments and microalgae represent the dominant route of exposure and metal accumulation for Sydney rock oyster (Saccostrea glomerata): a biokinetic model for zinc

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dc.contributor.authorLee, JHen_AU
dc.contributor.authorBirch, GFen_AU
dc.contributor.authorCresswell, Ten_AU
dc.contributor.authorJohansen, MPen_AU
dc.contributor.authorAdams, MSen_AU
dc.contributor.authorSimpson, SLen_AU
dc.date.accessioned2021-09-14T03:24:19Zen_AU
dc.date.available2021-09-14T03:24:19Zen_AU
dc.date.issued2015-08-01en_AU
dc.date.statistics2021-09-09en_AU
dc.description.abstractPast studies disagree on the extent to which dissolved or dietary uptake contribute to metal bioaccumulation in the filter-feeding Sydney rock oyster (Saccostrea glomerata) in urbanized estuaries. Although most data support the assumption that fine sediments are a major route of metal uptake in these bivalves, some studies based in the Sydney estuary, Australia, have indicated a poor correlation. In the present study, seawater, sediment and microalgae were radiolabelled with 65Zn tracer and exposed to S. glomerata to assess the influence of dissolved and dietary sources to Zn bioaccumulation. Oysters in the dissolved-phase uptake experiment (5, 25 and 50 μg L−1 65Zn for 4 d followed by 21 days of depuration) readily accumulated 65Zn for all three concentrations with an uptake rate constant of 0.160 ± 0.006 L dry weight g−1 d−1. Oysters in the dietary assimilation experiment (1 h pulse-feed of either 65Zn-radiolabelled suspended fine-fraction (<63 μm) sediment or the microalgae Tetraselmis sp.) accumulated 65Zn, with assimilation efficiencies of 59 and 67% for fine sediment and microalgae, respectively. The efflux rates were low for the three experiments (0.1–0.5% d−1). A bioaccumulation kinetic model predicts that uptake of Zn will occur predominantly through the dietary ingestion of contaminated fine sediment particles and microalgae within the water column, with considerably greater metal bioaccumulation predicted if oysters ingested microalgae preferentially to sediments. However, the model predicts that for dissolved Zn concentrations greater than 40 μg L−1, as observed during precipitation events, the uptake of the dissolved phase may contribute ≥50% to accumulation. Overall, the results of the present study suggest that all three sources may be important exposure routes to S. glomerata under different environmental conditions, but contributions from dietary exposure will often dominate. © 2015 Elsevieren_AU
dc.identifier.citationLee, J.-H., Birch, G. F., Cresswell, T., Johansen, M. P., Adams, M. S., & Simpson, S. L. (2015). Dietary ingestion of fine sediments and microalgae represent the dominant route of exposure and metal accumulation for Sydney rock oyster (Saccostrea glomerata): a biokinetic model for zinc. Aquatic Toxicology, 167, 46-54. doi:10.1016/j.aquatox.2015.07.020en_AU
dc.identifier.issn0166-445Xen_AU
dc.identifier.journaltitleAquatic Toxicologyen_AU
dc.identifier.pagination46-54en_AU
dc.identifier.urihttps://doi.org/10.1016/j.aquatox.2015.07.020en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/11702en_AU
dc.identifier.volume167en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectRadioisotopesen_AU
dc.subjectBiological accumulationen_AU
dc.subjectMetalsen_AU
dc.subjectZincen_AU
dc.subjectSedimentsen_AU
dc.subjectOystersen_AU
dc.subjectNew South Walesen_AU
dc.titleDietary ingestion of fine sediments and microalgae represent the dominant route of exposure and metal accumulation for Sydney rock oyster (Saccostrea glomerata): a biokinetic model for zincen_AU
dc.typeJournal Articleen_AU
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