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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.

From: Characterizing a Poacher-Driven Fire Regime in Low-Nutrient Coastal Grasslands of Pondoland, South Africa

   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