Table 2:
The number of species decreasing in abundance (z– species), the number of species increasing in abundance (z+ species), and the decreasing and increasing community-level change points (z– community change point and z+ community change point, respectively; units are kg N ha−1 yr−1 and showing 0.05−0.95 quantiles in brackets) for each alliance. PI = number of positive indicator species; In = number of invasive species.
| USNVC Alliance | n z- species (PI|In) | n z+ species (PI|In) | z- community change point | z+ community change point |
|---|---|---|---|---|
|
| ||||
| Forest and Woodland Habitats | ||||
| Abies lasiocarpa - Picea engelmannii Forest Alliance | 16 (0|1) | 26 (2|2) | 2.0 (2.0–2.8) | 4.3 (3.7–4.4) |
| Acer saccharum - Betula alleghaniensis - (Fagus grandifolia) Forest Alliance | 107 (5|13) | 75 (0|4) | 8.0 (7.3–8.9) | 8.9 (8.8–10.7) |
| Acer saccharum - Tilia americana - (Quercus rubra) Forest Alliance | 34 (3|1) | 60 (12|4) | 9.2 (8.5–9.8) | 10.9 (9.7–11.0) |
| Betula papyrifera Forest Alliance | 0 | 0 | ND | ND |
| Fagus grandifolia - Quercus rubra - Quercus alba Forest Alliance | 4 (1|0) | 9 (1|1) | 14.3‡ (10.2–16.0) | 16.2 (15.3–17.4) |
| Liriodendron tulipifera Forest Alliance | 2 (0|0) | 0 | 12.1‡ (10.2–12.2) | ND |
| Pinus contorta Forest Alliance | 21 (2|6) | 68 (2|1) | 2.8 (2.4–2.9) | 3.4 (3.4–4.2) |
| Pinus palustris Woodland Alliance | 196 (15|7) | 32 (1|3) | 9.7 (9.3–9.7) | 12.0 (9.6–12.3) |
| Pinus ponderosa Forest Alliance | 13 (3|2) | 15 (1|2) | 2.1 (1.9–2.3) | 4.0 (3.6–5.1) |
| Pinus strobus Forest Alliance | 45 (0|4) | 81 (3|2) | 8.7 (8.7–9.0) | 10.4 (9.6–11.5) |
| Pinus taeda Forest Alliance | 144 (0|10) | 42 (0|4) | 8.8 (8.0–9.4) | 11.3 (11.2–16.6) |
| Populus tremuloides Forest Alliance | 26 (2|9) | 72 (4|13) | 3.5 (3.6–4.8) | 8.3 (6.9–8.5) |
| Pseudotsuga menziesii Forest Alliance | 31 (7|12) | 31 (5|2) | 2.8 (2.2–3.5) | 4.6 (4.6–4.7) |
| Pseudotsuga menziesii Giant Forest Alliance | 4 (3|1) | 4 (1|0) | 2.5‡ (1.7–2.6) | 2.9‡ (2.5–4.4) |
| Pseudotsuga menziesii Woodland Alliance | 14 (2|1) | 57 (4|7) | 2.4 (2.2–2.6) | 2.6 (2.6–2.8) |
| Quercus alba - (Quercus rubra, Carya spp.) Forest Alliance | 64 (4|3) | 68 (0|5) | 10.2 (10.2–10.7) | 15.4 (14.4–17.4) |
| Quercus prinus - Quercus (alba, falcata, rubra, velutina) Forest Alliance | 8 (1|0) | 0 | 9.8 (9.8–11.7) | ND |
| Quercus spp. - Pinus (rigida, echinata) Forest Alliance | 104 (7|6) | 102 (0|9) | 9.2 (9.1–9.6) | 11.2 (11.1–12.4) |
| Thuja occidentalis Forest Alliance | 0 | 2 (0|0) | ND | 7.0‡ (6.6–7.6) |
| Tilia americana - Fraxinus americana - (Acer saccharum) Woodland Alliance | 43 (4|1) | 18 (3|4) | 9.4 (8.8–9.7) | 11.4 (9.8–11.4) |
| Shrubland Habitats | ||||
| Artemisia tridentata Shrubland Alliance | 9 (2|4) | 45 (6|11) | 1.8 (1.7–2.0) | 2.5 (2.3–2.7) |
| Grassland Habitats | ||||
| Andropogon gerardii - (Sorghastrum nutans) Herbaceous Alliance | 39 (1|4) | 35 (0|10) | 8.0 (6.8–8.6) | 10.6 (8.2–11.5) |
| Festuca idahoensis Herbaceous Alliance | 14 (1|5) | 43 (10|2) | 2.4 (2.4–2.5) | 4.2 (2.8–4.3) |
| Schizachyrium scoparium - Bouteloua curtipendula Herbaceous Alliance | 43 (3|7) | 23 (1|10) | 11.2 (11.2–11.7) | 11.8 (11.8–12.1) |
‡
community change point(s) based on fewer than five species