Howler Monkey Color Vision

Abstract The howler monkeys (Alouatta sp.) are the only New World primates to exhibit routine trichromacy. Both males and females have three cone photopigments. However, in contrast to Old World monkeys, Alouatta has a locus control region upstream of each opsin gene on the X.

Researchers have discovered that none of today's New World monkeys have trichromatic color vision, except for the howler monkey. This unique trait is likely similar to that of catarrhine primates. Abstract Electrophysiological and molecular genetic studies have shown that howler monkeys (Alouatta) are unique among all studied platyrrhines: they have the potential to display trichromatic color vision among males and females.

Howler Monkey Facts (Alouatta)

This study examined the color discrimination abilities of four howler monkeys (Alouatta caraya) through a series of tasks involving a behavioral paradigm of. In summary, we show that red-green colour vision is found in all howler monkeys, and it likely helps howlers to find preferred young, reddish leaves, which are an important part of their diet. Natural selection for trichromatic colour vision may be stronger for howler monkeys than it is for other primate species living in the same areas.

This is similar to red-green color blindness in humans, where they can distinguish blue from yellow and green, but struggle with differentiating red from green. An exception is the howler monkey, which has routine trichromatic vision, similar to Old World monkeys and humans. Thus, the examination of L/M opsin genetic variation in wild howler populations is of profound importance in our understanding of the evolution of both color vision polymorphism in platyrrhine primates, and routine and normal trichromacy in catarrhine primates.

Howler monkeys: living a life in colour helps finding better food ...

Trichromatic vision in Old World primates is based on the presence of both M and L pigment genes on the X-chromosome. New World primates can have genes to encode these pigment genes. Full trichromacy also evolved in the New World (NW) howler monkeys via an independent duplication of the same gene.

Abstract Primates possess remarkably variable color vision, and the ecological and social factors shaping this variation remain heavily debated. Here, we test whether central tenants of the folivory hypothesis of routine trichromacy hold for the foraging ecology of howler monkeys. TRICHROMATIC colour vision depends on the presence of three types of cone photopigment.

Howler monkeys may owe their color vision to leaf hue | Wildlife photos ...

Trichromacy is the norm for all Old World monkeys, apes and humans, but in several genera of New World.

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