Behaviour 2019
Food manipulation and learning in juvenile Sapajus flaviusáin an Atlantic forest fragment
Ana Paula B Ara˙jo, Natsumi Hamada-Fearnside, Italo F Pereira, Clayton E Jer˘nimo, Erick A Silva, Poliana G S Lins, Renata G Ferreira. Federal University of Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil

The juvenile period in primates is important in the development of skills needed to become efficient foragers. We studied how wild juvenile blond capuchin monkeys develop their manipulative behavior in regard to food present in a secondary Atlantic forest near sugarcane crops in Northeastern Brazil. A total of 31 hours of focal observation were conducted, 521 min on juv 1 (6 to 12mo), 701 on juv 2 (12 to 24mo) and 641 min on juv 3 (24 to 36mo). Most of the energy acquired by juveniles comes from sugarcane when compared to fruits within the fragment (CI=-59:-31). Juveniles 1 were less efficient foragers than juveniles 2 and 3, obtaining less energy (CI=8:44; 0.3:36, respectively) and spending more time manipulating sugarcane than juv 3 (CI=-0.03:-0.0006). This is consistent with foraging efficiency increasing with age. There were no significant differences in manipulation frequency between other food items in the fragment, which can be because most fruits in the fragment do not require much processing. We conclude that development of manipulative abilities to obtain energy from human derived foods in the fragment is a crucial skill for the survivorship of immatures in this fragment.