Abstract # 299 Event # 103:

Scheduled for Tuesday, June 4, 2002 08:45 AM-09:00 AM: Session 12 (Room 16/17, Cox Convention Center) Oral Presentation

Khaya Bark Chemistry and Behavioral Ecology at Sonso, Budongo Forest, Uganda

J. D. Paterson
University of Calgary, Dept. of Anthropology, Univ. of Calgary, 2500 University Dr. NW, Calgary, Alberta T2N 1N4, Canada
     Bark was sampled at 2 meters, 10 meters, and maximum height accessible on 36 specimens of Khaya anthotheca, a commerically important mahogany species and important food resource for primates at Budongo. Bark chemicals were extracted with a water-ethanol solution, dried, dissolved and run on silica-gel Thin Layer Chromatography plates in a solute developed for this project. Up to 12 distinct separations were visible under ultraviolet illumination (254 and 365 Ang). Four patterns of separations: 1) few compounds at 2 m., largest number at tree crown, 2) few compounds at crown, largest number at 2 m., 3) largest number at 10 m., lower numbers of compounds at 2 m. and crown, and 4) equal distribution of compounds. Only one sample showed no separations. Chemicals (anthocyanidins, terpenes, coumarins, and phenols) showed a NE to SW cline across the Sonso clearing with substantially fewer compounds separating in the NE quadrat trees. This is the same as the slope into the Sonso stream and swamp. Baboons resided predominantly in and fed upon Khaya bark with high levels of secondary compounds, and did not extensively utilize this species in the NE quadrat. Redtail monkeys residing there, however, consumed fruits, flowers and young leaves of Khaya. Data presently available cannot resolve a causality direction for the relationship between feeding on Khaya bark and secondary compounds present in the bark.