Figure 3. Relative abundance of a population of Atlantic salmon affected by a disease (ω_S = 0.6).

The abundance is given in percent of the total number of salmonids (). Brown trout are resistant to disease (ω_T = 1) and are not in competition with Atlantic salmon. (▪) R = 3; (▪) R = 6; (▪) R = 12. In a) effects of varying yet symmetric interbreeding success rate (); the trout disease resistance is inherited with the following properties: (—) dominantly in hybrids (ε_T½ = 1 and ε_{½ ⅔} = 1); (…) recessively in hybrids (ε_{T ½} = 0 and ε_{½ ⅔} = 1); and (– –) codominantly in hybrids (ε_{T ½} = 0.5 and ε_{½ ⅔} = 0.5). In b) time series of the relative abundance of Atlantic salmon (—) and hybrid populations (…) ((N_½+N_⅔)/(N₀+N₁+N_½+N_⅔)). The data presented correspond to the situation after 100 time steps (years).