Abstract # 219:

Scheduled for Monday, September 19, 2011 11:20 AM-11:40 AM: Session 28 (Salon F (Sixth Floor)) Oral Presentation


LIFE HISTORY TRAITS OF WILD SANJE MANGABEYS (CERCOCEBUS SANJEI) IN THE UDZUNGWA MOUNTAINS NATIONAL PARK, TANZANIA

D. Fern√°ndez
Stony Brook University, Interdepartmental Doctoral Program in Anthropological Sciences, Stony Brook, NY 11794-4364, USA
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Life history traits vary in different environments both within and between species. For Cercocebus mangabeys data are available primarily from captive settings, while information from wild populations remain scarce. Here I report gestation length and the variables influencing inter-birth intervals (IBI) in one group of wild Sanje mangabeys. Data collected over 30 months included daily sexual swelling size (n = 23 females) and all infant births and deaths. Mean cycle length was 29.6 ± 3.1 days (n = 28), with females exhibiting sexual swellings on ~ 90% of days. Mean gestation length was 170.5 ± 2.4 days (n = 7). Mean IBI following a surviving offspring was 578.0 ± 126.8 days (n = 4) with an average period of post-partum amenorrhea (PPA) of 218.0 ± 76.7 days (n = 13) and 3.7 ± 2.7 cycles to conception (n = 13). IBI following the death of an offspring was shorter (379.3 ± 157.5 days; n = 6). Compared to other Cercocebus species, C. sanjei exhibit similar gestation lengths, and longer PPA but shorter IBI after a surviving offspring. These results indicate that once cycling is resumed, conception occurs faster in C. sanjei. It should be noted, however, that most comparative data derive from captive individuals, and due to small sample sizes, statistical analyses could not be performed.