Abstract
Diet reconstruction of carnivores elucidates ecology of the species and prey-predator relationship in different bioclimatic regions. Micro-histological analyses of undigested prey hairs from tiger scats have widely been used for reconstruction of predator diet. However, sex of the prey is obtained from kill data, acquiring which require extensive and intensive monitoring. The encounter rate of scats in the field is relatively higher than that of kills. Thus, we used microscopic examination of prey hairs isolated from confirmed tiger scats (n = 42) collected from Ranthambore Tiger Reserve, Rajasthan, India to identify prey species. We describe a novel method for prey sex identification from a single hair collected per tiger scat. We extracted DNA from the prey hairs and validated the absence of tiger DNA using felid specific microsatellite loci. We could amplify up to 230 bp (base pairs) nuclear and mitochondrial fragments successfully from DNA extracted from a single prey hair. We amplified a Y-linked fragment for identifying male individuals while using a mitochondrial marker as a control for PCR amplification. Sambar (Rusa unicolor) and chital (Axis axis) were the principal prey of tiger in the study area with frequencies of occurrences of 47.6 and 30.9% respectively in tiger scats. The proportions of sambar and chital males in tiger diet were 80 and 61.5% respectively. The literature indicate that cervid males are more prone to predation, possibly shaping the demography of the prey species. The results corroborated previous studies reporting male-biased predation and were consistent with the low proportion of males documented in the wild populations. This technique can also identify the sex of young prey, which is difficult to ascertain from kills. Therefore, the described methodology holds the potential to augment information on tiger diet and underlying prey-predator dynamics to a finer resolution.
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Acknowledgements
We extend our sincere thanks to the Director, Dean and Research Coordinator, Wildlife Institute of India, and Nodal Officer, Wildlife Forensic Cell for facilitating the study. We appreciate the immense support offered by A. Madhanraj, Technical Staff. We would also like to express our gratitude to our colleagues for sharing their expertise with us.
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De, R., Joshi, B.D., Shukla, M. et al. Understanding predation behaviour of the tiger (Panthera tigris tigris) in Ranthambore tiger Reserve, Rajasthan, India: use of low-cost gel based molecular sexing of prey hairs from scats. Conservation Genet Resour 11, 97–104 (2019). https://doi.org/10.1007/s12686-017-0963-2
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DOI: https://doi.org/10.1007/s12686-017-0963-2