Adult male replacement and social change in two troops of hanuman langurs (Presbytis entellus) at Jodhpur,India |
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Authors: | Govindasamy Agoramoorthy |
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Institution: | (1) Conservation and Research Center, National Zoological Park, Smithsonian Institution, 22630 Front Royal, Virginia;(2) Department of Zoology, The Ohio State University, 43210 Columbus, Ohio;(3) Dr. Minna Hsu, Deparment of Biology, National Sun Yat-Sen University, Kaohsiung 804, Taiwan, Republic of China |
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Abstract: | I studied the process of adult male replacement and social change in two one- male troops (B20 and B21) of hanuman langurs (Presbytis entellus)at Jodhpur, India. Male-male competition lasted for about 6 months before the successful takeover of one troop (B20). During
that period, five adult males from three neighboring bands (AMB7, AMB9, and AMB10) and a resident male of a neighboring troop
(B21) were involved in taking over the troop. The latter male also copulated with six females during his interim residency,
which suggests that he may have opportunistically maximized his mating chances with females of a neighboring group. During
an intertroop interaction, a 14-month-old female infant of the other troop (B21) was fatally attacked by an adult female of
the first troop and the infant eventually died. The attacker may have taken advantage of the disorganization created by male-male
competition, perhaps to eliminate a future food competitor. In addition, the first troop gained an additional feeding area
from the other troop’s range; it included a sleeping site and a waterhole, indicating that territorial fights during social
instability may have led to the expansion of the winner’s resource area. |
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Keywords: | hanuman langur Presbytis entellus social change infanticide food competition |
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