AGGRESSIVENESS AND THE INTENSITY OF PROVISIONING (ARTIFICIAL FEEDING) HANUMAN LANGURS AROUND JODHPUR (RAJASTHAN)

Abstract

A behavioural study in free-ranging Hanuman langur (Semnopithecus entellus) around Jodhpur (west Rajasthan)
was conducted during 2008-2009. Different patterns of agonistic behaviour and aggressiveness in different
langur groups were observed depending on the intensity of provisioning during the study period. The effects of
artificial feeding were examined between two troops having minimum and maximum provisioning by local
peoples. Results are based on focal animal sampling and ad libitum sampling of 17 adult females in the group
Kailana II (low provisioning) and Mandore troops of the langur population of Jodhpur. The behaviour of their
aggressiveness was observed. Mandore troop having high provisioning and more interacting with human
population was observed to be more aggressive and play more agnostic interaction within and between two
troops compared to low provisioned troops. Highly provisioned troop had high-intensity aggression (68.9%)
and aggressiveness. In Mandore total 85 incident were observed when troop members play a major role in
aggressiveness. Studies on the nature of changing the aggressiveness with the intensity of provisioning and or
human interaction are essential for a basic understanding of the behavioral strategies that individual displays
when faced with changing food rapidly.

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