TY - JOUR
T1 - Cadmium uptake and zinc-cadmium antagonism in Australian tropical rock oysters
T2 - Potential solutions for oyster aquaculture enterprises
AU - Munksgaard, Niels
AU - Burchert, Shannon
AU - Kaestli, Mirjam
AU - Nowland, Samantha
AU - O'Connor, Wayne
AU - Gibb, Karen S.
PY - 2017
Y1 - 2017
N2 - Variable and occasionally high concentrations of cadmium in wild oysters at a remote location with the potential to develop aquaculture enterprises motivated research into the distribution and sources of metals in oysters, seawater, sediment, suspended solids and phytoplankton. Saccostrea mytiloides and Saccostrea mordax contained cadmium concentrations exceeding the food standard maximum level (ML) at three of four sites. At one site with high zinc levels in sediment, oyster cadmium levels were below the ML. Metal levels in seawater were not correlated with cadmium levels in oysters but high cadmium/zinc ratios were measured in Trichodesmium erythraeum blooms. We suggest that oysters accumulate cadmium mainly from annual phytoplankton blooms except at sites where zinc availability is sufficiently high to prevent uptake though a mechanism of antagonistic exclusion. Knowledge of the source and uptake mechanisms of cadmium in oysters should lead to new managementstrategies to reduce cadmium levels in farmed oysters.
AB - Variable and occasionally high concentrations of cadmium in wild oysters at a remote location with the potential to develop aquaculture enterprises motivated research into the distribution and sources of metals in oysters, seawater, sediment, suspended solids and phytoplankton. Saccostrea mytiloides and Saccostrea mordax contained cadmium concentrations exceeding the food standard maximum level (ML) at three of four sites. At one site with high zinc levels in sediment, oyster cadmium levels were below the ML. Metal levels in seawater were not correlated with cadmium levels in oysters but high cadmium/zinc ratios were measured in Trichodesmium erythraeum blooms. We suggest that oysters accumulate cadmium mainly from annual phytoplankton blooms except at sites where zinc availability is sufficiently high to prevent uptake though a mechanism of antagonistic exclusion. Knowledge of the source and uptake mechanisms of cadmium in oysters should lead to new managementstrategies to reduce cadmium levels in farmed oysters.
UR - http://www.scopus.com/inward/record.url?scp=85029571057&partnerID=8YFLogxK
U2 - 10.1016/j.marpolbul.2017.09.031
DO - 10.1016/j.marpolbul.2017.09.031
M3 - Article
C2 - 28938999
SN - 0025-326X
VL - 123
SP - 45
EP - 56
JO - Marine Pollution Bulletin
JF - Marine Pollution Bulletin
ER -