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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Evaluation of non-invasive genetic sampling methods for estimating tiger population size
Auteurs :	Samrat Mondol, Auteur ; K. Ullas Karanth, Auteur ; N. Samba Kumar, Auteur ; Arjun M. Gopalaswamy, Auteur ; Anish Andheria, Auteur ; Uma Ramakrishnan, Auteur
Type de document :	Article
Dans :	Biological Conservation (142(10) OCT 2009)
Article en page(s) :	2350-2360
Langues:	Anglais
Résumé :	There is often a conservation need to estimate population abundances of elusive, low-density, wide-ranging carnivore species. Because of logistical constraints, investigators often employ non-invasive 'captures' that may involve 'genetic' or 'photographic' sampling in such cases. Established capture-recapture (CR) methods offer a powerful analytical tool for such data. In this paper, we developed a rigorous combination of captive, laboratory and field-based protocols for identifying individual tigers (Panthers tigris) from fecal DNA. We explored trade-offs between numbers of microsatellite loci used for reliable individual identifications and the need for higher capture rates for robust analyses. Our field surveys of scats were also specifically designed for CR analyses, enabling us to test for population closure, estimate capture probabilities and tiger abundance. Consequently, we could compare genetic capture estimates to results of a 'photographic capture' study of tigers at the same site. The estimates using the heterogeneity model (M-h-Jackknife) for fecal DNA survey were [Mt+1 = 26; p = 0.09 and (N) over cap (S (E) over cap[(N) over cap])=66 (12.98)] in close agreement with those from the photographic survey [(Mt+1 = 29; p = 0.04 and (N) over cap (S (E) over cap[(N) over cap]) =

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