Table 1 Mean fire return intervals (FRIs) estimated for Mkambati Nature Reserve and its respective vegetation types (see Figure 1A) for the period 2007 to 2016, using a simplistic formula (see text) and maximum likelihood survival analysis (the three-parameter Weibull distribution). Mean FRIs for merged grasslands within (close to) and outside of (away from) a 3 km buffer of likely poacher entry points are also shown. CI denotes 95 % confidence limits.
| Â | Â | Formula | Weibull analysis | |||
|---|---|---|---|---|---|---|
|  | Proportion of Mkambati | Simplistic FRI (yr) | Weibull FRI (yr ± CI) | Shape parameter | Scale parameter | FRIs censored (%) |
Entire reserve | 1.00 | 3.36 | 2.59 ± 0.02 | 1.31 | 4.83 | 45 |
Merged grassland (including wetland and rock) | 0.88 | 3.09 | 2.56 ± 0.02 | 1.29 | 4.65 | 42 |
Themeda grassland | 0.03 | 44.38 | 9.06 ± 0.22 | 1.30 | 194.46 | 87 |
Forest | 0.09 | 8.00 | 5.61 ± 0.14 | 1.05 | 23.73 | 66 |
Merged grassland close to likely poacher entry points | 0.35 | 2.08 | 1.99 ± 0.02 | 1.39 | 3.19 | 36 |
Merged grassland away from likely poacher entry points | 0.53 | 2.88 | 2.56 ± 0.02 | 1.29 | 4.65 | 55 |