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Table 1 Sampling details and parameters estimates of tiger density from camera trap based spatial capture-recapture analysis in Ranthambhore Tiger Reserve

From: Demography of a small, isolated tiger (Panthera tigris tigris) population in a semi-arid region of western India

Year No. of camera locations Camera trap Polygon (km2) Trap Nights Mt + 1 a \( \widehat{N} \) b(SE) Pe Known tiger population > 1 Year \( \widehat{D} \) (SE)d /100km2 (CI95%) Known densityc /100km2 g0 (SE) σ (SE) Km
Cub
2006 40 139 48 16 16 (0.73) 1.0 5f 15f 15f 4.62 (1.19) (2.81–7.59) : 0.06 (0.009) 2023.0 (131.6)
: 0.03 (0.007) 4162.6 (430.4)
2009 48 162 28 25 26 (1.52) 0.96 19f 17f 2f 8.75 (1.79) (5.88–13.02) : 0.05 (0.009) 1547.0 (110.2)
: 0.05 (0.009) 1564.4 (104.3)
2012 60 223 45 22 30 (3.9) 0.73 12 16 6 5.68 (1.22) (3.74–8.64) 5.60 : 0.08 (0.008) 1529.0 (81.7)
: 0.08 (0.007) 2136.9 (97.2)
2013 76 464 51 37 40 (2.62) 0.92 18 20 14 7.56 (1.25) (5.47–10.44) 7.60 : 0.05 (0.005) 1480.7 (85.5)
: 0.05 (0.005) 1948.7 (83.3)
2014 182 492 48 39 39 (1.38) 1.0 21 21 12 7.22 (1.16) (5.27–9.88) 7.63 : 0.05 (0.006) 1496.5 (73.3)
: 0.04 (0.003) 2161.7 (78.4)
  1. aMt + 1: Unique adult tigers photo-captured in camera traps
  2. b \( \widehat{N} \): Population estimates derived from spatially explicit capture recapture technique (regional population size using ‘region.N’);
  3. cKnown density: Known tiger population/ tiger occupied area : Male; : Female
  4. d \( \widehat{D} \): Density estimates (model averaged); g0: detection probability at home range center; σ: movement parameter
  5. eP: Proportion of the population detected by camera trap survey
  6. fSince all tigers were not photo-captured, here we have reported the minimum number of known individuals