Kwok Kevin W H, Grist Eric P M, Leung Kenneth M Y
Swire Institute of Marine Science, Faculty of Science, The University of Hong Kong, Cape d'Aguilar Road, Shek O, Hong Kong, PR China.
Ecotoxicol Environ Saf. 2009 Feb;72(2):358-64. doi: 10.1016/j.ecoenv.2008.03.014. Epub 2008 Oct 7.
Copper (Cu) contamination is common and widespread in coastal marine environments. This study used the marine copepod Tigriopus japonicus to test whether Cu resistance can be developed through multigeneration acclimation to elevated Cu levels and whether the resistance has a fitness cost. T. japonicus (F0) were acclimated to three Cu concentrations (0, 10, and 100 microg l(-1)) and offspring (F1 and F2) of each treatment were subsequently acclimated at these three concentrations, respectively. Our results evidently indicated that Cu resistance of the copepod was increased even after one generation of acclimation to 100 microg Cu l(-1). The acquired Cu resistance had a fitness cost, as the intrinsic population growth rate of this Cu resistant lineage was significantly lower than the control. The Cu resistance of the offspring from Cu resistant copepods, when raised under control conditions, returned to a level comparable to the control implying a plastic physiological adaptation.
铜（Cu）污染在沿海海洋环境中普遍且广泛存在。本研究利用海洋桡足类日本虎斑猛水蚤来测试是否可以通过多代适应升高的铜水平来产生抗铜性，以及这种抗性是否具有适合度代价。将日本虎斑猛水蚤（F0）分别适应三种铜浓度（0、10和100微克/升），然后将各处理组的子代（F1和F2）分别在这三种浓度下进行适应。我们的结果清楚地表明，即使经过一代适应100微克/升的铜，桡足类的抗铜性也有所提高。所获得的抗铜性具有适合度代价，因为这种抗铜谱系的内在种群增长率显著低于对照组。当在对照条件下饲养时，抗铜桡足类的子代的抗铜性恢复到与对照组相当的水平，这意味着存在可塑性生理适应。
