Table 1 Indicator Species Analysis results for shrub and forb species across watershed ages and plot-level burn severity groupings. Age = watershed age, Old (> 85 yr) or Young, (< 85 yr); Fire Severity = none (0.-0.5), mid (1–1.5), or high (> 1); ISA A = relative abundance; ISA B = relative frequency; IV (Indicator Value) = ISA A × ISA B × 100. Nativity and Duration classifications are from USDA PLANTS Database52. Seral stage was determined from multiple sources37,53,54,55. All important indicator species (IV > 25) are listed below, sensu Dufrêne and Legendre22. Graminoid species comprised multiple species of grasses, sedges, and rushes; since the nativity, duration, and seral stage could not be narrowed down to one type, they were left blank.
From: Riparian vegetation layers differ three years after mixed severity wildfire in Oregon
Age | Fire severity | Species | ISA A | ISA B | p-value | IV | Growth form | Nativity | Duration | Seral stage |
|---|---|---|---|---|---|---|---|---|---|---|
Shrub Species | ||||||||||
Old | High | Rubus leucodermis | 0.72 | 0.33 | 0.00 | 23.87 | Woody | Native | Perennial | Pioneer |
Old | Mid + None | Rubus spectabilis | 1.00 | 0.28 | 0.01 | 27.43 | Woody | Native | Perennial | Early |
Old | None | Acer circinatum | 0.74 | 0.78 | 0.00 | 58.00 | Woody | Native | Perennial | Mid |
Old | None | Tsuga heterophylla | 0.97 | 0.55 | 0.00 | 53.09 | Woody | Native | Perennial | Late |
Old | None | Thuja plicata | 0.92 | 0.48 | 0.00 | 44.32 | Woody | Native | Perennial | Late |
Old | None | Rhododendron macrophyllum | 1.00 | 0.42 | 0.00 | 41.67 | Woody | Native | Perennial | Early |
Old | None | Vaccinium ovatum | 1.00 | 0.37 | 0.00 | 36.67 | Woody | Native | Perennial | Late |
Old | None | Vaccinium parvifolium | 0.98 | 0.33 | 0.00 | 32.55 | Woody | Native | Perennial | Late |
Young | High + None | Rubus spectabilis | 0.91 | 0.29 | 0.01 | 26.80 | Woody | Native | Perennial | Early |
Young | None | Acer circinatum | 0.59 | 0.80 | 0.00 | 47.17 | Woody | Native | Perennial | Mid |
Young | None | Oemleria cerasiformis | 0.70 | 0.57 | 0.00 | 40.27 | Woody | Native | Perennial | Mid |
Young | None | Vaccinium parvifolium | 0.98 | 0.38 | 0.00 | 36.72 | Woody | Native | Perennial | Late |
Young | None | Corylus cornuta | 0.47 | 0.57 | 0.01 | 26.91 | Woody | Native | Perennial | Mid |
Young | None | Tsuga heterophylla | 1.00 | 0.27 | 0.00 | 26.79 | Woody | Native | Perennial | Late |
Forb species | ||||||||||
Old | High | Lactuca serriola | 0.91 | 0.44 | 0.00 | 39.77 | Forb | Exotic | Annual | Early |
Old | High + Mid | Claytonia sibirica | 0.80 | 0.33 | 0.00 | 26.79 | Forb | Native | Perennial | Early |
Old | High + Mid | Epilobium angistifolium | 1.00 | 0.26 | 0.00 | 25.87 | Forb | Native | Perennial | Pioneer |
Old | High + Mid | Graminoid species | 0.80 | 0.32 | 0.00 | 25.49 | Forb | |||
Young | High | Epilobium angistifolium | 0.85 | 0.50 | 0.00 | 42.16 | Forb | Native | Perennial | Pioneer |
Young | High + Mid | Epilobium ciliatum | 0.98 | 0.28 | 0.00 | 26.90 | Forb | Native | Perennial | Pioneer |
Young | None | Oxalis oregana | 0.71 | 0.59 | 0.00 | 41.82 | Forb | Native | Perennial | Late |
Young | None | Polystichum munitum | 0.73 | 0.49 | 0.00 | 35.85 | Fern | Native | Perennial | Late |
