Parturition Signaling by Visual Cues in Female Marmosets (Callithrix jacchus)

摘要: New World monkeys have polymorphic color vision, in which all males and some females are dichromats, while most trichromats. There is little consensus about selective pressures fashioned primate although detection of food, mates predators has been hypothesized. Behavioral evidence shows that from different species Neotropical primates seem to perceive the timing female conception gestation, although, no signals fulfilling this function identified. Therefore, we used visual models test hypothesis marmosets show chromatic and/or achromatic cues may indicate time parturition for male conspecifics. By recording reflectance spectra marmosets’ (Callithrix jacchus) sexual skin, running discrimination models, found both variables fluctuate during weeks precede succeed parturition, forming “U” inverted patterns contrast, respectively. We suggest variation skin chroma luminance might be by helpers dominant identify birth, variations as clues potential fathers pregnancy stage prepare paternal burdens well detect oestrus early post-partum period.