Population abundance and distribution of the endangered golden langur (Trachypithecus geei, Khajuria 1956) in Bhutan

Primates; Journal of Primatology
Phuntsho Thinley Gempa

Abstract

Reliable population estimates are lacking for many South Asian primate species, including the golden langur (Trachypithecus geei), which is endangered and restricted to Bhutan and northeast India. Although well studied in India, few studies exist on this species in Bhutan. In November 2017, we undertook a nationwide survey of golden langurs in Bhutan using double observers along trail-based transects in 17 blocks within its habitat, and modeled its distribution using MaxEnt. A total of 2439 golden langurs in 222 groups were collectively encountered by 17 teams of double observers, from which, an overall population of 2516 ± SE 363 individuals and 236 ± SE 9 groups were estimated. Group sizes varied from 2 to 35 individuals with a mean of 11 ± SD 0.38 individuals. A total of 468 adult males (19%), 924 adult females (38%), 649 juveniles (27%), and 398 infants (16%) were counted. Adult male-to-female sex ratio was 1:1.97 and adult female-to-infant ratio was 1:0.43. We determined 2848 km2 of suitable area for golden langurs in Bhutan and estimated a density of 0.88 individuals/km2. Our population estimate of golden langurs in Bhutan is much lower than the current IUCN estimate of 4000 individuals for Bhutan, necessitating a reasses...Continue Reading

References

Sep 6, 2001·American Journal of Primatology·A SrivastavaP Bujarbarua
Jun 5, 2003·Folia primatologica; international journal of primatology·Tashi WangchukMatthew P Hare
Sep 1, 2005·Primates; Journal of Primatology·Andrew J Plumptre, Debby Cox
Feb 2, 2008·American Journal of Primatology·Andrew R MarshallPiran C L White
Dec 1, 2017·Folia primatologica; international journal of primatology·Denise SpaanFilippo Aureli

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