Abstract # 2201 Poster # 57:

Scheduled for Thursday, June 21, 2007 05:00 PM-07:00 PM: Session 7 (South Main Hall) Poster Presentation

Leaping into the Night: When Owl Monkeys (Aotus sp.) Awake

E. Tapanes1, C. K. Wolovich2 and S. Evans3
1Florida International University, Department of Biology, Miami, FL, USA, 2University of Miami, 3DuMond Conservancy for Primates and Tropical Forests, Inc.
     Nocturnal owl monkeys (Aotus sp.) tend to be most active just after sunset and before sunrise. Details of their behavior during these activity bouts remain unknown. The DuMond Conservancy (Miami, FL, USA) houses a large colony of owl monkeys in a semi-natural environment. We observed ten groups of owl monkeys (seven male-female pairs, two males with offspring, one single male) from June to October 2006 in order to examine their activity budget. Each group was observed on six occasions just after sunset for fifteen minutes. The behaviors (move, alert, rest, eat, social, other) of the adult monkeys (n=17) were recorded using instantaneous scan sampling at thirty second intervals. The monkeys moved (mean = 37.8% of scans) or were alert (mean = 34.0% of scans) more often than they rested (mean = 1.6% of scans) or engaged in social interactions (mean = 2.1% of scans) [Friedman’s c2(4)=42.3, p<0.001; Wilcoxon Signed Ranks post-hoc comparisons, p<0.001]. They spent the remainder of the time that they were in view eating provisioned food or insects that they had caught (mean = 7.4%). There were no significant differences in the proportion of scans that males and females exhibited any of these behaviors [p>0.05]. Contrary to many diurnal primates, owl monkeys are quite active when they first awake. Their frequent movement and alert behavior may be a consequence of their insect foraging.