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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