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Table 4 Statistics of fire interval distributions for Ciénega de la Vaca, Durango, Mexico, from 1739 to 1982. Statistical analysis was carried out in three categories: (1) all fire years, including those represented by a single fire scar; (2) fire years in which 10% or more of the recording sample trees were scarred; and (3) fire years in which 25% or more of the recording sample trees were scarred. MFI mean fire interval, Min minimum fire interval, Max maximum fire interval, WMPI Weibull median probability interval

From: Climatic influence on fire regime (1700 to 2008) in the Nazas watershed, Durango, Mexico

Site and analysis period Category of analysis Intervals MFI (yr) Min (yr) Max (yr) Average per-sample fire interval (yr) WMPI
Low elevation site 1739 to 1982 All scars 77 3.16 1 16 16.9 2.69
10% scarred 56 4.34 1 20   3.73
25% scarred 28 8.68 1 31   7.22
Low elevation site 1739 to 1954 All scars 73 2.95 1 12 16.4 2.59
10% scarred 53 4.00 1 12   3.60
25% scarred 27 7.85 1 22   6.80
High elevation site 1739 to 1954 All scars 76 2.63 1 7 13.0 2.45
10% scarred 60 3.33 1 9   3.14
25% scarred 32 6.25 1 19   5.44
Combined 1739 to 1982 All scars 107 2.27 1 8 15.6 2.04
10% scarred 62 3.92 1 20   3.44
25% scarred 30 8.10 2 31   6.97
Combined 1739 to 1954 All scars 102 2.11 1 7 15.3 1.94
10% scarred 59 3.64 1 12   3.37
25% scarred 29 7.31 2 22   6.61