Abstract # 1141 Event # 378:

Scheduled for Thursday, June 29, 2006 10:00 AM-06:00 PM: Session 46 (Kama B) Symposium

SYMPOSIUM:  Orangutans compared

S. Wich1, A. Russon2 and C. van Schaik3
1Utrecht University, Behavioural Biology, Po. Box 80086, Utrecht 3508 Tb, The Netherlands, 2Glendon College of York University, Psychology, 2275 Bayview Ave., Toronto M4N 3M6, Canada, 3Anthropological Institute & Museum, University of Zürich, Winterthurerstrasse 190, 8057-Zürich, Switzerland
     In recent years, it has become apparent that there is no such thing as a standard orangutan. It is now accepted that orangutans constitute two distinct species (Sumatran Pongo abelii, Bornean Pongo pygmaeus) and intra-species variability is proving to be extensive on morphological, behavioural, socioecological and cultural levels. At this point, it would be very useful to map the variation in orangutans in the broadest sense, with the aim of reaching an understanding of the causes. To reach full understanding of the variability, we have been working to compile all data from all long-term sites anywhere in orangutans’ current range. This symposium represents our collective evaluation of patterns in variability and tentative explanations. Topics to be covered include: genetics and taxonomy, jaw morphology and diet variation, capacity in different (sub)species, floristics and phenology , density and trends, activity budgets, geographic variation in diet, dietary and ranging responses to fluctuating food availability, orangutans in disturbed and unprotected forests, health and parasites, ecology of reproduction, development, life history, vocal repertoire, ranging and female social organisation, male mating strategies, male-female relationships, innovations and intelligence. We conclude with a synthesis and comparison with other apes.