Chinese Science Bulletin

, Volume 57, Issue 10, pp 1135–1141 | Cite as

Noninvasive genetic assessment of the population trend and sex ratio of the Shennongjia population of Sichuan snub-nosed monkeys (Rhinopithecus roxellana)

Open Access
Article Ecology


Effective population management relies on assessments of population size and sex ratio. However, these estimates are difficult to obtain for elusive and rare species. Recently, noninvasive genetic census methods have been developed as an alternative to traditional capture-mark-recapture methods. In this study, we estimated the size of the Sichuan snub-nosed monkey (Rhinopithecus roxellana) population in the Shennongjia Nature Reserve (SNR) using a noninvasive sampling method based on 16 microsatellite loci. We also used a PCR-based genetic method to sex the sampled individuals and infer the population sex ratio. The population size of R. roxellana in the SNR was estimated to be 1044 individuals (95% CITIRM: 613–1409). The estimated population sex ratio is more female-biased than expected, which we attribute to the sampling biased towards one male units and limited sampling of bachelor male units. Moreover, there is no suggestion that the heavy traffic road through the reserve might block movement of monkeys. The results of this study indicate genetic assessments based on a noninvasive sampling method can provide useful information regarding populations of elusive primates.


snub-nosed monkey Shennongjia noninvasive sampling population size sex ratio 


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Copyright information

© The Author(s) 2011

Open Access This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.

Authors and Affiliations

  1. 1.Key Laboratory of Animal Ecology and Conservation Biology, Institute of ZoologyChinese Academy of SciencesBeijingChina
  2. 2.Department of PrimatologyMax Planck Institute for Evolutionary AnthropologyLeipzigGermany
  3. 3.Graduate University of the Chinese Academy of SciencesBeijingChina
  4. 4.Hubei Province Key Laboratory of Conservation Biology of Shennongjia Golden MonkeyMuyuChina

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