Wildlife Research Wildlife Research Society
Ecology, management and conservation in natural and modified habitats
RESEARCH ARTICLE

Establishing baseline estimates of blue sheep (Pseudois nayaur) abundance and density to sustain populations of the vulnerable snow leopard (Panthera uncia) in Western Bhutan

Leki A , Phuntsho Thinley B C F , Rajanathan Rajaratnam D and Rinjan Shrestha E
+ Author Affiliations
- Author Affiliations

A Lingzhi Park Range, Jigme Dorji National Park, Department of Forests and Park Services, Gasa, Bhutan.

B Ugyen Wangchuck Institute for Conservation and Environment Research, Department of Forests and Park Services, Bumthang, Bhutan.

C Ecosystem Management, University of New England, Armidale, NSW 2350, Australia.

D Geography and Planning, University of New England, Armidale, NSW 2350, Australia.

E World Wildlife Fund, Toronto, ON M5V 1S8, Canada.

F Corresponding author. Email: chetsho78@gmail.com

Wildlife Research 45(1) 38-46 https://doi.org/10.1071/WR16218
Submitted: 26 March 2016  Accepted: 23 October 2017   Published: 29 March 2018

Abstract

Context: Advances have been made in the development of reliable methods for estimating the abundance and density of large threatened mammalian predators, but there is little progress on developing population estimates for their principal prey. No standardised protocol for estimating prey populations exists, therefore different researchers use different methods. As such, there is little information on key prey species of the vulnerable snow leopard and this has hindered the preparation of effective snow leopard conservation plans.

Aims: This study aimed to establish an estimated seasonal baseline population abundance and density of blue sheep in the Lingzhi Park Range (LPR) of Bhutan’s Jigme Dorji National Park over winter (December to February) and summer (May to July). It also aimed to assess the number of snow leopard individuals that the current blue sheep population can sustain in the study area.

Methods: A refined double-observer survey method was used and involved walking transect lengths of 414 km in winter and 450 km in summer to estimate blue sheep abundance with the aid of 8 × 30 binoculars and 15 × 45 spotting scopes.

Key results: In total, 1762 (s.e. ± 199) blue sheep individuals were recorded in winter at a density of 8.51 individuals per km2 and 2097 (s.e. ± 172) individuals in summer at a density of 9.32 individuals per km2. Mean group size of blue sheep was 38.12 individuals (s.e. ± 6) in winter and 52.36 individuals (s.e. ± 4) in summer. LPR was estimated to sustain 11–17 snow leopards in winter and 15–21 in summer.

Key conclusions: LPR can be a hotspot for snow leopard conservation in western Bhutan and regionally in the eastern Himalayas, because the comparatively higher estimated blue sheep abundance and density supports possibly the highest density of snow leopards in Bhutan. The modified double-observer method used to assess blue sheep population estimates is inexpensive, robust and practical for the mountainous terrain of the Himalayas.

Implications: On the basis of this study, it is recommended that a refined double-observer method is adopted as a standard technique for estimating blue sheep populations in the snow leopard range countries of the Himalayas. Snow leopard conservation plans should, additionally, include efforts to minimise threats to blue sheep populations. This refined method is also highly applicable for future surveys of gregarious mammalian taxa, such as ungulates and primates, in difficult mountainous terrain elsewhere in the world.

Additional keywords: double-observer survey, Eastern Himalayas, Jigme Dorji National Park, mountain ungulates, snow leopard conservation.


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