title: Reproductive parameters in Guizhou snub-nosed monkeys (Rhinopithecus brelichi).
abstract: In this study, we present data on reproductive parameters and birth seasonality of Guizhou snub-nosed monkeys (Rhinopithecus brelichi). Our analyses are based on data from a small captive population collected over 15 years and on 5 years of observations of free-ranging snub-nosed monkeys. Captive females (n=4) mature at an age of 70.8+/-6.7 months and reproduce for the first time at 103.4+/-7.5 months. The mean interbirth interval was 38.2+/-4.4 months if the infant survived more than 6 months, which is longer than that in R. roxellana and R. bieti. In the wild and in captivity, births are very seasonal and occur only in a period from the end of March to the end of April. Our data suggest that population growth in Guizhou snub-nosed monkeys is slow compared with the other two Chinese snub-nosed monkey species. The risk of extinction is therefore particularly high in this species, given the small overall population size and slow population recovery potential.
authors.affiliation: Primate Genetics, German Primate Center, Kellnerweg 4, Göttingen, Germany. myang@dpz.eu
authors.forename: Mouyu
authors.initials: M
authors.lastname: Yang
authors.forename: Dun Y
authors.initials: DY
authors.lastname: Sun
authors.forename: Dietmar
authors.initials: D
authors.lastname: Zinner
authors.forename: Christian
authors.initials: C
authors.lastname: Roos
mesh_terms: D000818:Animals; D001721:Birth Intervals; D001723:Birth Rate; D016673:Colobinae / Q000502:physiology*; D005260:Female; D008297:Male; D008423:Maternal Age; D008425:Maternal Behavior; D011158:Population Growth; D011247:Pregnancy; D012098:Reproduction / Q000502:physiology*; D012621:Seasons