Abstract # 3042 Poster # 195:

Scheduled for Sunday, September 18, 2011 07:00 PM-09:00 PM: Session 23 (Salon G (Sixth Floor)) Poster Presentation


J. Chism and T. Kieran
Winthrop University, Department of Biology, Rock Hill, South Carolina 29733, USA

We studied the vocalizations of wild equatorial saki monkeys (Pithecia aequatorialis) in the Área de Conservacíon Regional Comunal de Tamshiyacu-Tahuayo (ACRCTT), Peru. This species, little-studied in the wild, has not been previously been reported south of the Amazon River and its vocalizations have not been described. Sakis occupy dense, seasonally-flooded, lowland rainforest making extended visual contact with them difficult. Their vocalizations can be used to locate groups, localize and track individuals, and identify group activities when visibility is poor. Results here are based on approximately 300 hours of observations from 5 June -20 July 2010. Vocalizations were recorded ad libitum as MP3 files using a parabolic stereo microphone attached to a digital linear recorder, then analyzed using Raven Pro 1.3 bioacoustic software. We simultaneously noted behavioral data on individuals and groups (when possible) and habitat information. We identified 7 main call types with at least 9 call variations, verified using Mann Whitney U tests (p < 0.05), followed when necessary with Bonferroni corrections, on call attributes (including means, ±SEM of minimum and maximum frequency, frequency range, and duration). We compared these with sonographs of vocalizations of P. pithecia and P. monachus. P. aequatorialis calls showed similar sonograph patterns to four P. pithecia calls and five P. monachus calls. With the genus Pithecia undergoing review, vocalizations may provide an important aid in species identification.