Sex differences in behavioural and anatomical estimates of visual acuity in the green swordtail Xiphophorus helleri

Eleanor M Caves, Fanny De Busserolles & Laura A Kelley
Among fishes in the family Poeciliidae, signals such as colour patterns, ornaments, and courtship displays play important roles in mate choice and male-male competition. Despite this, visual capabilities in Poeciliids are understudied, in particular visual acuity, the ability to resolve detail. We used three methods to quantify visual acuity in male and female green swordtails (Xiphophorus helleri), a species in which body size and the length of the male's extended caudal fin ('sword') serve as...
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