Figure 5 - Fire histories were reconstructed using charcoal found in discrete deposits within incised alluvial fans. The smoothed data represents the sum of subsets of fire probabilities. The inverted bar graphs below the smoothed data show the sample count and represent the number of charcoal fragments creating the fire reconstruction. Upper basin sites (blue data) are cool and moist with higher elevations (2750–1380 m). These basins receive an average of ~750 mm of precipitation per year. Lower basin sites (red data) encompass elevations ranging from 2650 – 1102 m and are warmer and drier than upper basin sites. Lower basin sites receive ~400 mm of precipitation per year. The combined upper and lower basin fire history is shown in black and represents all fires reconstructed in the Middle Fork Salmon River. Grey bars indicate periods of time when upper and lower basin sites where burning. This synchronicity suggests large scale climate driving the timing of fire, in contrast to ecosystem differences driving variability in the timing of fire.
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