School of Biological Sciences, University of Canterbury, Christchurch 8140, New Zealand.
Aquat Toxicol. 2012 Nov 15;124-125:114-24. doi: 10.1016/j.aquatox.2012.07.013. Epub 2012 Aug 16.
Laboratory studies were performed to assess the impact of acute and subchronic cadmium (Cd) exposure on the green-lipped mussel, Perna canaliculus. A 96 h median lethal concentration (LC(50)) value of 8160 μg L(-1) was determined, characterising this species as relatively tolerant to Cd exposure. Acute (96 h; at 2000 and 4000 μg Cd L(-1)) and subchronic (28 d; at 200 and 2000 μg Cd L(-1)) waterborne exposures were then conducted to investigate the impact of Cd exposure on physiological responses (e.g. clearance (feeding) rate, absorption efficiency, oxygen uptake, ammonia production, oxygen to nitrogen ratio, scope for growth) and tissue Cd accumulation. Cd accumulation in digestive gland showed saturation with respect to increasing exposure concentration, while the gill tissue Cd accumulation followed a positive linear relationship with Cd exposure level. Clearance rates declined during both acute and subchronic exposures at levels of 2000 μg Cd L(-1) or higher. Impairments of clearance rates were strongly correlated with tissue Cd accumulation. Coupled with their importance as a food source, and their wide coastal distribution, these data suggests that P. canaliculus may be a species useful as an indicator species for trace metal pollution in coastal environments.
实验室研究旨在评估急性和亚慢性镉（Cd）暴露对绿贻贝（Perna canaliculus）的影响。确定的 96 小时半数致死浓度（LC50）值为 8160 μg/L，表明该物种对 Cd 暴露具有相对耐受性。然后进行了急性（96 小时；在 2000 和 4000 μg Cd/L）和亚慢性（28 天；在 200 和 2000 μg Cd/L）水相暴露，以研究 Cd 暴露对生理反应（如摄食率、吸收率、耗氧量、氨产量、氧氮比、生长范围）和组织 Cd 积累的影响。消化腺中的 Cd 积累与暴露浓度的增加呈饱和关系，而鳃组织中的 Cd 积累与 Cd 暴露水平呈正线性关系。在 2000 μg Cd/L 或更高的水平下，急性和亚慢性暴露期间的清除率均下降。清除率的降低与组织 Cd 积累密切相关。结合它们作为食物来源的重要性及其在沿海地区的广泛分布，这些数据表明，绿贻贝可能是一种有用的指示物种，可用于评估沿海环境中的痕量金属污染。
