Table 1 Summary of surveys giving mean mark proportion per working zone, mean number of dogs sighted per working zone and total across areas, Chapman and distance sampling method estimates with 95% confidence intervals. In bold: Means of repeated surveys, abundance estimates calculated with data from both surveys
From: A comparison of population estimation techniques for individually unidentifiable free-roaming dogs
| Â | Mark proportion | Number of dogs sighted | Chapman abundance | Distance-method abundance | |||||
|---|---|---|---|---|---|---|---|---|---|
Per working zone | Total area | Per working zone | Total study area | Total study area | |||||
Mean | (SD) | Mean | (SD) | Estimate | (95% CI) | Estimate | (95% CI) | ||
All roads | |||||||||
 Both surveys | 0.45 | (0.22) |  | 22.63 | (9.70) | 5202.36 | (4733.75–5670.97) | 5067.06 | (4454.27–5764.17) |
  Survey 1 | 0.41 | (0.25) | 559 | 21.42 | (9.27) | 6438.73 | (6044.40–6833.07) | 5681.90 | (4945.60–6527.81) |
  Survey 2 | 0.48 | (0.18) | 622 | 23.84 | (10.15) | 3965.99 | (3683.61–4248.36) | 4948.98 | (4296.05–5701.14) |
Subset roads | |||||||||
 Both surveys | 0.41 | (0.23) |  | 13.65 | (5.83) | 5190.76 | (4491.27–5890.26) | 5810.61 | (5141.12–6567.28) |
  Survey 1 | 0.40 | (0.24) | 359 | 13.77 | (5.02) | 5743.77 | (5239.96–6247.59) | 7019.16 | (5529.45–8910.22) |
  Survey 2 | 0.42 | (0.22) | 358 | 13.53 | (6.64) | 4637.75 | (4157.64–5117.87) | 5295.03 | (4385.32–6393.45) |