Niche Differentiation Data

We collected behavioural data from April 2016 – September 2016 and from January 2017 – July 2017. The study population comprised 113 individually identifiable white-faced capuchin monkeys from 4 social groups, which ranged in size from 15-30 individuals in 2016 and from 18-33 individuals in 2017. We observed each group during at least one “rotation” per month, where rotations comprised 2-5 consecutive observation days from dawn (04:45-05:30) until dusk (18:00-19:00). We recorded behavioural data using Samsung Galaxy Tab 4 tablets loaded with PrimateLogger (developed by Scott Johnson for Android devices), which recorded a date/time stamp and UTM coordinates for each line of text entered. During group follows, we conducted instantaneous scans (Altmann, 1974) every 30 minutes on each hour and half hour mark (e.g. 05:00, 05:30, 06:00, etc.). We identified as many individual monkeys as possible within 10 minutes and recorded their behavioural states (see supplementary material). As each individual and its behavioural state was identified, we also recorded its relative height in the canopy, the support substrate type, and the support substrate angle it was using at the moment the individual was first observed. During fruit foraging we recorded the species of fruit; during invertebrate foraging we recorded whether the behaviour was visual searching/gleaning or extractive in nature. To minimize biasing data collection in favor of central individuals, we sought to begin scans with a different monkey each time and moved around the group. Daily maximum temperature (degrees Celsius) is recorded daily as this site using a Kestrel thermometer. Daily rainfall (cm) is recorded with a cylindrical rain gauge. Monthly fruit biomass (kg/ha) is estimated based on monthly phenological survey.