Ecological Archives E093-162-A1

Peter Z. Fulé, Larissa L. Yocom, Citlali Cortés Montaño, Donald A. Falk, Julián Cerano, and José Villanueva-Díaz. 2012. Testing a pyroclimatic hypothesis on the México–United States border. Ecology 93:1830–1840. http://dx.doi.org/10.1890/11-1991.1

Appendix A. Additional fire, model, and climate data.

Table A1. Seasonal distribution (number and percent) of fire scars based on the position of the fire scar within the tree ring. The seasonality at Rustler Park was reported as percentages only by Seklecki et al. (1996).

Site Season
determined
Season not
determined
Dormant Early
earlywood
Middle
earlywood
Late
earlywood
Latewood
Mesa de las Guacamayas, Chihuahua, México
MP 227 (66%) 119 (34%) 44 (19%) 44 (19%) 102 (45%) 33 (15%) 4 (2%)
PS 104 (74%) 37 (26%) 21 (20%) 27 (26%) 43 (42%) 10 (10%) 2 (2%)
RT 293 (69%) 132 (31%) 68 (23%) 60 (21%) 120 (41%) 43 (15%) 2 (1%)
AB 142 (61%) 90 (39%) 35 (25%) 36 (25%) 60 (42%) 11 (8%) 0
Mean 67.5% 32.5% 21.8% 22.8% 42.5% 12.0% 1.3%
Rustler Park, Arizona, U.S.A.
RPK 100% 0 38.2% 13.2% 41.2% 7.4% 0


Table A2. Parameters of empirical logistic regression models based on current-year and 1- and 2-year lagged PDSI values as predictors of actual fires at Mesa de las Guacamayas (MDG) and Rustler Park (RPK). Logistic model form given in text.

Site Category Modeling
dates
α β1 β2
MDG All Fire Dates 1733-2003 -1.244 -0.361 0.355
25%-Scarred Fire Dates -2.194 -0.473 0.411
RPK All Fire Dates 1733-1892 -0.722 -0.349 0.343
25%-Scarred Fire Dates -1.798 -0.541 0.558

Fig. A1. Reconstructed Palmer Drought Severity Index (Cook et al. 2004) averaged across the four southwestern grid points mapped in Fig. 1. After 1990, PDSI values are averaged across only the U.S. grid points mapped in Fig. 1.


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