Fig. 1

Comparison of final body weights (mean ± SE, g) between control and treatment groups of R. norvegicus humiliatus or R. tanezumi in Experiment 1 (Exp1) (a) (n _control = n _treatment = 9 for R. n. humiliatus and n _control = 9, n _treatment = 10 for R. tanezumi.) and Experiment 2 (Exp2) (b) (n _control = n _treatment = 6 for R. n. humiliatus; n _control = 7 and n _treatment = 8 for R. tanezumi). Independent samples t-test or Mann–Whitney U-test; *p ≤ 0.05