Abstract # 2005 Event # 42:

Scheduled for Thursday, August 17, 2006 04:00 PM-04:15 PM: Session 5 (Regency East #2) Oral Presentation


Demographic Aspects of Reproductive Success in Captive Goeldi’s Monkeys

K. B. Nuss
University of Chicago, Commitee on Evolutionary Biology, Culver Hall 402, 1025 E. 57th Street, Chicago, IL 60637, USA
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     Reproductive success is determined by the number of offspring an individual produces and the survival of those offspring. I examined the breeding records of Goeldi’s monkeys (Callimico goeldii) housed in 116 zoos in 25 countries over a 23-year period to identify demographic factors associated with reproduction and offspring survival. I found that 41% of males (n=398) and 31% of females (n=355) fail to produce any offspring. Although environmental conditions varied, institution, country, and year did not impact offspring production. Reproductive output varied greatly among reproducing individuals (mean = 6.04 offspring, sd = 4.68), due in part to variation in individuals’ opportunity for reproduction. Of 1859 recorded births, 57% of infants survived at least two years, the approximate age at which an animal is paired for breeding. The offspring sex ratio did not significantly differ from 50:50, nor was there a significant association between sex and offspring survival. Logistic regression analysis revealed inbreeding and maternal parity to be significantly associated with offspring survival (chi-square = 15.18, p <0.0001; chi-square = 14.93, p <0.0001, respectively). Paternal parity, maternal and paternal age and origin (captive or wild born) were not significant. This detailed dataset showed reproductive output is most influenced by opportunity for reproduction, while offspring survivorship is impacted by maternal parity and inbreeding. These results identify specific factors to be addressed to improve zoo breeding attempts.