Figure 2.

Frequency of cone pigments across sex. Frequency of cone pigments in females (gray) and males (white); M. zebra (top), M. auratus (middle) and P. taeniolatus (bottom). Frequency of cone pigments was calculated for each sex and each species based on spectral sensitivity data. For example, three of four M. auratus females possessed the SWS1 cone pigment in their retinas, thus 75% of M. auratus females possessed the SWS1 cone pigment. On the other hand, three of seven M. auratus males possessed the SWS1 cone pigment in their retina, thus 43% of M. auratus males possessed the SWS1 cone pigment. Sex differences in the frequency of cone pigments in M. zebra and M. auratus are larger than in P. taeniolatus.

Sabbah et al. BMC Biology 2010 8:133   doi:10.1186/1741-7007-8-133
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