Table 2 LT50 values and 95% confidence intervals of adults and juveniles from the different G. fossarum populations exposed to Cd Organisms population Median LT50 [CI 95 %] Not-acclimatized (100 g L) Ardi Bacu Bois Gala Mand Tour Acclimatized (100 g L)" Ardi Bois Mand Tour FI juveniles (20 g L'a Ardi Bois Mand Tour 266 156 156 129 109 131 130 57.5 50.9 91.8 79.0 32.3 32.8 16.9 [208; 290] [136; 174] [136: 173] [99.7; 157] [92.7; 128] [107; 164] [105: 145] [50.1: 72.9] [46.7: 55.6] [75.5; 105.4] [66.7; 101] [26.0; 36.0] [29.6: 41.5] [14.2; 20.8] Survival curves are presented in Fig. 2 a Cd nominal concentrations of test solutions used for toxicity tests In Vigneron et al., 2015, amphipods, Gammarus fossarum, were collected from six different sites within the Rhone-Alpes region of France. Amphipods were tested to determine their ability to survive in different concentrations of Cd, either 100 ug/L for the FO (just collected population) or 20 ug/L for the F1 generation. The median time in hours (LT50) until death was reported as the endpoint. a. The Ardi population was suspected to be resistant to metals. In the FO generation, do the results support that this population has increased tolerance to Cd? Do the results in the FO generation support that this population is resistant to Cd? b. Describe the difference between the tolerance across all populations in the FO (exposed to 100 ug/L Cd) vs. the tolerance of the F1 generation (exposed to 20 ug/L)? Do these results support that the Ardi population is resistant to Cd?