Reproductive Strategies of <Emphasis Type="Italic">Trachypithecus pileatus</Emphasis> in Arunachal Pradesh,India |
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Authors: | G S Solanki Awadhesh Kumar B K Sharma |
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Institution: | (1) Department of Forestry, North Eastern Regional Institute of Science and Technology, Nirjuli-791 109, Itanagar, Arunachal Pradesh, India;(2) Department of Zoology, North Eastern Hill University, Shillong—, 793 022, Meghalaya, India |
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Abstract: | We studied reproductive behavior of free-ranging capped langurs (Trachypithecus pileatus) in the Pakhui Wildlife Sanctuary, Arunachal Pradesh, India. Four species of primates —Trachypithecus pileatus, Macaca mulatta, M. assamensis, and Nycticebus bengalensis— live there. We studied the mating seasons, mating frequency, copulatory attempts, time spent in copulation, and interval
between 2 successive copulations, gestation length, and interbirth interval of 4 groups of capped langurs during 2001–2003.
We observed 2 mating seasons in a year. The first was larger, comprising 5 months (September–January), and the second was
short, April and May. Mating was intensive in the morning session (0600–1000 h); 57% of total mating events occurred then.
The average gestation period was 200 d. November was the most favorable month for breeding. In a year, 107 mating events occurred
involving 5 adult females. Average time per mounting attempt is 12 s. Duration of mounting was the maximum in November. Interbirth
interval was 23 months and 10 d. The birth season was 129 days, December–April; 53% of births occurred in February and March.
Average birth rate is 0.386 birth/female/yr. |
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Keywords: | birth interval breeding season gestation length mating behavior reproduction Trachypithecus pileatus |
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