Abstract
Primates are among the globally imperiled fauna requiring urgent conservation interventions to protect their habitat. Information on species distribution and factors influencing it are vital to species management and habitat protection. In this study, we assessed habitat occupancy of the lion-tailed macaque (Macaca silenus), bonnet macaque (M. radiata), and black-footed gray langur (Semnopithecus hypoleucos) that occur in the Kudremukh Wildlife Division, a large protected area network in the central Western Ghats. We examined the influence of habitat variables on the occupancy probability of these primates. We carried out four temporally replicated detection/non-detection surveys to assess detection probability and site occupancy of the primate species. We surveyed 244 sites of 5 Km2, with each site surveyed for 4 days, to assess detection probability and site occupancy. Among the three species, the langur had the highest habitat occupancy estimate (0.66 ± 0.05SE) and the lion-tailed macaque had the lowest estimate (0.28 ± 0.08SE). The habitat occupancy estimate for the bonnet macaque was (0.56 ± 0.05SE). Wet and semi-evergreen forest cover and mean elevation positively influenced the lion-tailed macaque’s occurrence. Covariates influencing bonnet macaque’s occurrence were plantations, semi-evergreen and moist deciduous forests, and non-forest areas. Mean elevation negatively affected its occurrence. Wet evergreen forests and plantations positively influenced the occurrence of the langur. We examined spatial segregation between the species based on their site occupancy. Pairwise comparisons revealed a significant negative association between the bonnet macaque and the other two primates. However, we found a significant positive association between the lion-tailed macaque and the langur. We discuss these results and their implications for conservation of primates in the region. Given the cost-effectiveness of carrying out surveys at large spatial scales, we recommend occupancy surveys for future surveys of forest primates.
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11 February 2022
A Correction to this paper has been published: https://doi.org/10.1007/s10329-022-00977-3
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Acknowledgements
We thank Sri Ajai Misra IFS (Retired) for his support and encouragement for the successful completion of this survey. We also thank Dr. Malathi Priya M, IFS, for her suggestions, support, and cooperation throughout the survey. We thank Sri B. Bhaskar, Sri Sadanand, and Smt. N.K. Nirmala. We also thank the following Range Forest Officers: Sri Shivaram Achar, Sri Sharath Shetty, Sri A.A. Gopal, Sri S.M. Kadolkar, Sri Tanuj Kumar, Sri I.R. Dafedar, and Sri Dhavale. We thank Sri H. Shreedhar, Sri S. Hariprasad, and Sri Vincent for their support during the survey. We thank the Information Communication Technology (ICT) cell of the Karnataka Forest Department providing requisite files and maps needed for the survey. We thank the Kudremukh Wildlife Division, Karkala, Karnataka State Forest Department for logistics and other support towards successful completion of this work. We are thankful to the two anonymous reviewers whose insightful comments substantially improved the manuscript.
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Sushma, H.S., Ramesh, K.P. & Kumara, H.N. Determinants of habitat occupancy and spatial segregation of primates in the central Western Ghats, India. Primates 63, 137–147 (2022). https://doi.org/10.1007/s10329-021-00966-y
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DOI: https://doi.org/10.1007/s10329-021-00966-y