Article Ecology

Chinese Science Bulletin

, Volume 57, Issue 10, pp 1135-1141

First online:

Open Access This content is freely available online to anyone, anywhere at any time.

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

  • ZongFei ChangAffiliated withKey Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of SciencesDepartment of Primatology, Max Planck Institute for Evolutionary AnthropologyGraduate University of the Chinese Academy of Sciences
  • , ZhiJin LiuAffiliated withKey Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences
  • , JingYuan YangAffiliated withHubei Province Key Laboratory of Conservation Biology of Shennongjia Golden Monkey
  • , Ming LiAffiliated withKey Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences Email author 
  • , Linda VigilantAffiliated withDepartment of Primatology, Max Planck Institute for Evolutionary Anthropology Email author 

Abstract

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.

Keywords

snub-nosed monkey Shennongjia noninvasive sampling population size sex ratio