Delayed Dispersal and Immigration in Equatorial Sakis (Pithecia aequatorialis): Factors in the Transition from Pair- to Group-Living.

摘要: Saki monkeys (Pithecia spp.) live in pairs and small groups, sometimes with more than 1 same-sex adult. Previous studies have not been able to distinguish additional, unrelated adults from adult-sized offspring, but both can influence social relationships mating strategies, albeit different ways. In this study, we documented the immigration of an adult male equatorial saki (P. aequatorialis) into a group following departure previous resident male. At immigration, contained female, her 5-year-old (adult age) 1.5-year-old daughters, 1-month-old infant. We used nearest neighbor, approach, grooming, playing, aggression, copulation data describe dynamics between immigrant 2 females. 12 months his arrival, tended be closer groom daughter mother, he mated Both females interacted each other, eventually reproduced. These observations provide evidence that sakis, offspring may delay dispersal reproduce within their natal group, thus transitioning groups reproductive same sex.