Impact of social environment on variation in menstrual cycle length in captive female olive baboons (Papio anubis).

“Friendship” with Males: A Female Counterstrategy to Infanticide in Chacma Baboons of the Okavango Delta

___–1 ___ 0 ___ +1 The fundamental conflict of reproductive interests between males and females, originally articulated by Trivers (1972) and Parker (1979), may have diverse evolutionary consequences at multiple levels: genetic, morphological, physiological , social, ecological, life historical (Arnqvist and Rowe 2005; Chapman 2006). This volume addresses one dramatic manifestation of this conf...

Body temperature and physical activity correlates of the menstrual cycle in Chacma Baboons (Papio hamadryas ursinus).

We investigated the temporal relationship between abdominal temperature, physical activity, perineal swelling, and urinary progesterone and estradiol concentrations over the menstrual cycle in unrestrained captive baboons. Using a miniature temperature-sensitive data logger surgically implanted in the abdominal cavity and an activity data logger implanted subcutaneously on the trunk, we measure...

Age at maturity in wild baboons: genetic, environmental and demographic influences.

The timing of early life-history events, such as sexual maturation and first reproduction, can greatly influence variation in individual fitness. In this study, we analysed possible sources of variation underlying different measures of age at social and physical maturation in wild baboons in the Amboseli basin, Kenya. The Amboseli baboons are a natural population primarily comprised of yellow b...

Serum leptin levels in wild and captive populations of baboons (papio): implications for the ancestral role of leptin.

Leptin has emerged as the major lipostat, regulating adiposity by affecting feeding behavior and thermogenesis. Leptin levels in normal-weight Western humans and in captive rodents are 5-15 ng/ml. But evidence suggests that these levels are abnormally high and that leptin may have evolved as a more general metabolic signal, with its most robust effects at lower levels. If this is true, then wil...

Olive baboons, Papio anubis, adjust their visual and auditory intentional gestures to the visual attention of others