Colour discrimination in the black-tufted-ear marmoset (Callithrix penicillata): ecological implications |
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Authors: | Pessoa Daniel M A Cunha Juliana F Tomaz Carlos Pessoa Valdir F |
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Institution: | Laboratory of Neurosciences and Behaviour and Primate Centre,University of Brasilia, Brasilia, Brazil. |
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Abstract: | The dietary diversity of marmosets is substantial, which may reflect differences in their colour vision. This study examined the colour discrimination ability of a gummivore/insectivore callitrichid, Callithrix penicillata, which inhabits the Brazilian cerrado (bush savanna). A series of ecologically relevant tasks, involving a behavioural paradigm of discrimination learning in semi-natural conditions and the usage of ecologically relevant stimuli, was executed. Three marmosets, 2 males and a female, behaved like human dichromats, showing an impaired performance when orange and green stimuli had to be discriminated. In contrast, 2 females resembled human trichromats, discriminating those kinds of pairs. Our data suggest that Callithrix penicillata presents a polymorphic trichromacy, with dichromatic males and dichromatic or trichromatic females. |
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