Do tigers displace leopards? If so, why?
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We investigated predictions concerning the competitive relationships between tigers Panthera tigris and leopards Panthera pardus in Bardia National Park, Nepal, based on spatial distributions of scats and territorial markings (sign), analyses of scat content and census of wild ungulate prey. Medium-sized ungulates, in particular chital Axis axis, was the main food of both predators, but leopards consumed significantly larger proportions of domestic animals, small mammals, and birds than tigers. Tiger sign were never found outside the park, while leopard sign occurred both inside and outside, and were significantly closer to the park border than tiger sign. Significantly higher prey densities at locations of tiger sign than that of leopards were mainly due to a preference of the latter species for the park border areas. Our results imply that interference competition––and not competition for food––was a limiting factor for the leopard population, whose distribution was restricted to the margins of the tiger territories. We suggest that the composition of the prey base is a key factor in understanding the different results and interpretations reported in studies on tiger/leopard coexistence. There are two potential mechanisms that link interference competition and prey: (1) low abundance of large ungulate prey decreases foraging efficiency of tigers, leading to increased energetic stress and aggression towards leopards; and (2) increased diet overlap due to scarcity of large prey leads to increased encounter rates and increased levels of interference competition.
KeywordsAvoidance behavior Resource partitioning Exploitative competition Competition refuge
This study was funded by the Royal Norwegian Agency for Development Cooperation (NORAD) as part of a collaborative research program between the Department of National Parks and Wildlife Conservation/Nepal and the Norwegian University of Life Sciences. Bardia National Park (BNP) and Nepal Trust for Nature Conservation (NTNC) provided technical support. In particular, we want to thank Narayan Choudary and Tanku Choudary (BNP), and Shanta Raj Jnawali, Man Bahadur Lama, Man Singh Lama, and Suk Bahadur (NTNC) for assistance during fieldwork. Manuela Panzacchi, Jon E. Swenson, Ullas Karanth, and Atle Mysterud provided constructive input to the manuscript. All field activities on which this research was based comply with the laws of Nepal.
- Athreya V (2006) Is relocation a viable management option for unwanted animals? The case of the leopard in India. Conserv Soc 4:419–423Google Scholar
- Begon M, Harper JL, Townsend CR (1990) Ecology: individuals, populations and communities, 2nd edn. Blackwell, CambridgeGoogle Scholar
- Burnham KP, Anderson DR (2002) Model selection and multimodel inference: a practical information-theoretic approach, 2nd edn. Springer, BerlinGoogle Scholar
- Creel S, Spong G, Creel NM (2001) Interspecific competition and the population biology of extinction-prone carnivores. In: Gittleman J, Macdonald D, Funk S, Wayne R (eds) Conservation of carnivores. Cambridge University Press, Cambridge, pp 35–60Google Scholar
- Goss-Custard JD (1980) Competition for food and interference amongst waders. Ardea 68:31–52Google Scholar
- Hayward MW, Henschel P, O’Brien J, Hofmeyr M, Balme G, Kerley GIH (2006) Prey preferences of the leopard (Panthera pardus). J Zool 270:298–313Google Scholar
- Karanth KU (1993) Predator–prey relationships among large mammals of Nagarahole National Park, India. PhD Dissertation, Mangalore University, Mangalore, IndiaGoogle Scholar
- Karanth KU, Stith BM (1999) Prey depletion as a critical determinant of tiger population viability. In: Seidensticker J, Christie S, Jackson P (eds) Riding the tiger: tiger conservation in human dominated landscapes. Cambridge University Press, Cambridge, pp 100–113Google Scholar
- McDougal C (1988) Leopard and tiger interactions at Royal Chitwan National Park, Nepal. J Bombay Nat Hist Soc 85:609–610Google Scholar
- Mukherjee SP, Goyal SP, Chellam R (1994a) Refined techniques for the analysis of Asiatic lion Panthera leo persica scats. Acta Theriol 39:425–430Google Scholar
- Odden M, Wegge P (2009) Kill rates and food consumption of leopards in Bardia National Park, Nepal. Acta Theriol 54:23–30Google Scholar
- Seidensticker J, Sunquist ME, McDougal C (1990) Leopards living at the edge of the Royal Chitwan National Park, Nepal. In: Daniel JC, Serrao JS (eds) Conservation in developing countries: problems and prospects. Bombay Natural History Society and Oxford University Press, Bombay, pp 415–423Google Scholar
- Singh HS (2005) Status of the Leopard Panthera pardus in India. Cat News 42:15–17Google Scholar
- Støen OG, Wegge P (1996) Prey selection and prey removal by tiger (Panthera tigris) during the dry season in lowland Nepal. Mammalia 60:363–373Google Scholar
- Sunquist M, Karanth KU, Sunquist F (1999) Ecology, behaviour and resilience of the tiger and its conservation needs. In: Seidensticker J, Christie S, Jackson P (eds) Riding the tiger: tiger conservation in human dominated landscapes. Cambridge University Press, Cambridge, pp 5–18Google Scholar
- Tilman D (1982) Resource competition and community structure. Princeton University Press, PrincetonGoogle Scholar
- Woodroffe R, Ginsberg JG (2005) King of the beasts? Evidence for guild redundancy among large mammalian carnivores. In: Ray J, Berger J, Redford KH, Steneck R (eds) Large carnivores and biodiversity: does saving one conserve the other? Island Press, New York, pp 154–176Google Scholar