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Fire Ecology
Fig. 4 | Fire Ecology

Fig. 4

From: Distant neighbors: recent wildfire patterns of the Madrean Sky Islands of southwestern United States and northwestern Mexico

Fig. 4

Hexagon plots of two-dimensional bin counts (bins in horizontal and vertical directions = 20), representing pattern metric values (Table 2) by year for fires that burned between 1985 and 2011 in the Madrean Ecoregion Sky Island, US and Mexico. Metrics include: a) Fire size, b) Core area index, c) Perimeter area ratio, d) Shape index, e) Eccentricity and f) Bearing. The position of each bin represents the average of the x, y values assigned to the bin; bin color corresponds to the mean scPDSI for fires in the bin (orange to green scale represents drier to wetter conditions). Due to outliers, fire size is presented in log scale on the y-axis of Fig. 4a. Fires exhibited heterogeneity in spatial patterns across years and climates. In early time periods, fires occurred in a mixture of wetter and drier years, but after 2005, a majority of fires burned in years with moderate to severe drought conditions (scPDSI < −2)

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