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Metal and oxygen uptake in the green mussel Perna viridis under different metabolic conditions
Author(s) -
Wang Jingfeng,
Chuang ChiaYing,
Wang WenXiong
Publication year - 2005
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1897/05-109r.1
Subject(s) - perna viridis , mussel , anoxic waters , oxygen , environmental chemistry , chemistry , metal , respiration , bioaccumulation , absorption (acoustics) , zoology , botany , biology , ecology , organic chemistry , physics , acoustics
Coupled respirometric and radiotracer techniques were applied to simultaneously measure the rates of oxygen and metal uptake in the green mussel Perna viridis . This was performed under different metabolic conditions by varying the ambient oxygen partial pressure ( Po 2 ), temperature, air exposure, and body size. When the mussels were tested under different hypoxic and anoxic conditions, Cd and Zn uptake decreased with decreasing Po 2 , accompanied by a decrease in the ventilation activity of mussels. Significant reduction in metal uptake was observed at a Po 2 level of 3 kPa. Under anoxic conditions, the uptake of Cd and Zn was 1.6 to 2.7 times and 2.8 times, respectively, lower than those measured under normoxia. In contrast, both the absorption efficiencies of Cd and Zn and the oxygen extraction efficiency increased significantly with decreasing Po 2 . There were significant correlations between the rates of Cd/Zn and O 2 uptake by the mussels when quantified under various Po 2 levels. The uptake of Cd and Zn was temperature dependent and increased with temperature over a range of 15 to 30°C. Significant correlations between the rates of Cd/Zn and O 2 uptake were also found in the temperature experiments. With reimmersion of mussels after aerial exposure, the mussels experienced an apparent O 2 debt. Metal uptake also increased within the first 15 min followed by gradual recovery to the control levels. Similarly, the quantified uptake rates of Zn were significantly correlated with the O 2 uptake in experiments with different sizes of mussels. These results strongly suggest that Cd and Zn uptake are coupled with oxygen uptake in the mussels; thus, physiological processes need to be considered in studying metal accumulation.