Gradient Evolution of Body Colouration in Surface- and Cave-Dwelling Poecilia mexicana and the Role of Phenotype-Assortative Female Mate Choice

Figure 6

Nutritional state estimated through male abdominal distension. Abdominal distension was calculated as the body height/length ratio (see main text). Shown are means (±SE) for males from Arroyo Bonita (AB, green square), El Azufre (EA, red square), Cueva del Azufre chamber II (CA-II, white square), chamber V (CA-V, grey square), and chamber X (CA-X, black square). Significant differences (based on post hoc LSD tests) are indicated by different letters.