Fig. 7

Linkage disequilibrium coefficient (D) between preference allele C_R and either the threshold allele thr_low or sex chromosome A. On the left: simulations starting with XX/XY system with scenarios 10% C_R (a) and 90% C_R (b). On the right: simulations starting with ZW/ZZ system with scenarios 10% C_R (c) and 90% C_R (d). Each curve indicates median values calculated from 100 runs. Vertical dotted lines indicate the end of each sex-determination period and the dashed lines indicate the start of ultimate population decline. Note that negative linkage disequilibrium (LD) with A is equivalent with positive LD with a. Year zero refers to the start of climate warming