Ecology and general behavior of phayre's langur (Presbytis phayrei Blyth) at Wat Thum Pha Pu in Changwat Loei
1993
Wicharn Uicharoensak
Studies on the ecology and general behavior of the Phayre's Langur (Presbytis phayrei Blyth) had been conducted at Wat Thum Pha Pu from April 1990 to March 1991 with the prime justification that this langur is now regarded as a highly threatened primate confronting the strong destructive pressures of the environmental condition and the inbreeding depression. It is a primate of slender build possessing relatively long limbs and tail, lacking cheek pouches, with diagnostic pale bluish eye rings. The population structure of the studied troop comprises 3 adult males, 6 adult females, 2 subadults and 2 infants, totalling 13 individuals, with observed declining tendency. Its restricted habitat encompasses the home range area of 0.20 square km (125.00 rai) and the local density of 65.00 individuals/square km (0.104 individual/rai). There are two main behavioral types, those concerning its own affair and those concerning the communal troop. The former include the habitat selection, feeding, resting and movement, while the latter include the maintainance of leadership role, territorial protection, breeding, infant take-care and social grooming. The observed relationship to human comprises the positively being supported and negatively being hunted. This langur troop is, at present, critically on the verge of local extinction and appropriate conservation measures are highly needed for its continual existence.
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