Table 1 Frequency distribution of plots where non-native species were found. Also shown are total plots sampled of each burn severity level and physiographic location and percent of plots sampled within each category with non-natives present.
From: Burn Severity and Non-Native Species in Yosemite National Park, California, USA
Severity Level | Â | Plots with non-natives | Bull thistle | Prickly lettuce | Yellow salsify | Spiny sowthistle | Common sheep sorrel | Total plots sampled | Percent with non-natives |
|---|---|---|---|---|---|---|---|---|---|
High | Upland | 3 | 2 | 1 | 1 | 1 | 0 | 9 | 33 % |
| Â | Riparian | 8 | 5 | 2 | 2 | 1 | 1 | 11 | 73 % |
Moderate | Upland | 1 | 0 | 0 | 0 | 1 | 0 | 10 | 10 % |
| Â | Riparian | 5 | 3 | 1 | 1 | 3 | 0 | 10 | 50 % |
Low | Upland | 4 | 3 | 0 | 1 | 0 | 0 | 10 | 40 % |
| Â | Riparian | 1 | 1 | 0 | 0 | 1 | 0 | 10 | 10 % |