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Differential tolerance to stress is partly responsible for the heterogeneity of biomarker responses between populations of a sentinel species. Although currently used for freshwater biomonitoring, studies concerning inter-populational variability in tolerance to contaminants for the zebra mussel ( Dreissena polymorpha ) are scarce. Moreover, this well-known invader is currently replaced by another, the quagga mussel ( Dreissena rostriformis bugensis ). To evaluate the differential tolerance between dreissenids, several populations of both species were exposed to a high concentration of nickel. A LT 50  (time when 50% of individuals were dead) was established for each population. Biomarker responses and internal nickel concentration were also measured, to link tolerance with physiological status. Results evidenced that  D. polymorpha  populations are more heterogeneous and more tolerant than  D. r. bugensis  ones. For  D. polymorpha  populations only, LT 50  values were positively correlated with the nickel contamination  in situ , with higher anti-oxidative defences and a higher Integrated Biomarker Response value in the field. Such findings may be explained by local adaptation and invasion dynamic within each species. The significance of this differential tolerance when using biomarker responses for biomonitoring purposes is thus discussed.

Differential tolerance to nickel between Dreissena polymorpha and Dreissena rostriformis bugensis populations