Data from: Status of the mountain ungulate prey of the endangered snow leopard Panthera uncia in the Tost Local Protected Area, South Gobi, Mongolia

The availability of wild prey is a critical predictor of carnivore
density. However, few conservation programmes have focused on the
estimation and monitoring of wild ungulate populations and their trends,
especially in the remote mountains of Central Asia. We conducted
double-observer surveys to estimate the populations of ibex Capra sibirica
and argali Ovis ammon in the mountainous regions of Tost Local Protected
Area, South Gobi province, Mongolia, which is being considered for
designation as a Nature Reserve. We also conducted demographic surveys of
the more abundant ibex to examine their sex-ratio and the survival of
young during 2012–2013. The estimated ibex population remained stable in
2012 and 2013 and the estimated argali population increased from 108 in
2012 to 230 in 2013. The biomass of wild ungulates was c. 6% that of
livestock. Mortality in young ibex appeared to increase after weaning, at
the age of 12 months. We estimated the population of wild ungulates was
sufficient to support 14–18 adult snow leopards Panthera uncia. The adult
snow leopard population in our study area during 2012–2013, estimated
independently using camera-trap-based mark–recapture methods, was 12–14.
Based on our results we identify the Tost Local Protected Area as an
important habitat for the conservation of these ungulates and their
predator, the Endangered snow leopard, and recommend elevation of its
status to a Nature Reserve.