Fig. 3
Effect of parasite density on initial population growth rate in G. salaris infections. a Relationship between initial population size and maximum (initial) growth rate for Neva (open circles), and Scottish and Norwegian stocks (filled circles). Pearson correlation coefficients for each group significant at the 0.05 level. b Relationship between mean maximum (initial) growth rate for each stock and the increment due to initial density (r2 = 0.83, P < 0.005). Filled circles, stocks in which the relationship was significant (P < 0.01) at the individual level, closed circles, stocks in which the relationship was not significant at individual level