Figure 1
From: Trade-off between morphological convergence and opportunistic diet behavior in fish hybrid zone
Geographic distribution range. Green color represents allopatric C. nasus nasus populations 1 = Chee; 2 = Flet; 3 = Allier; 4 = Usses; 5 = Tisza; Grey color represents C. n. borysthenicum populations 6 = Dniester (see text for more details). Red color represents allopatric C. toxostoma toxostoma populations 7 = Ain; 8 = Tarn; 9 = Doubs; 10 = Berre. Yellow square represents the hybrid zone (Durance river) with the split into Less Regulated part (Buech) and Highly Regulated part (Manosque-Pertuis).