Table 2. Means, Standard Errors, and estimates of linear regression of community stability, structure, and species richness of subdominant species as a function of the cover of the dominant species, Larrea tridentata and Bouteloua eriopoda over a 10 year period at the Sevilleta NWR.
| Larrea | Bouteloua | |||||||||
| Stability | Mean (SE) | Equation | r2 | P | n | Mean (SE) | Equation | r2 | P | n |
| Population stability | 0.43(0.01) | y = 0.42+0.0003x | 0.02 | 0.228 | 92 | 0.44(0.004) | y = 0.48−0.001x | 0.13 | <0.001 | 100 |
| Community stability | 1.16(0.05) | y = 1.30−0.01x | 0.08 | 0.008 | 90 | 1.04(0.03) | y = 1.27−0.01x | 0.09 | 0.002 | 100 |
| Compositional stability (log) | 3.95−16(0.09) | y = 0.35−0.011x | 0.17 | <0.001 | 91 | 1.10−15(0.04) | y = −0.27+0.01x | 0.06 | 0.013 | 100 |
| Probabilites of turnover | 0.57(0.01) | y = 0.54+0.001x | 0.06 | 0.018 | 91 | 0.68(0.007) | y = 0.72−0.001x | 0.04 | 0.037 | 100 |
| Probabilities of colonization | 0.29(0.01) | y = 0.28+0.001x | 0.05 | 0.03 | 93 | 0.36(0.004) | y = 0.39−0.001x | 0.07 | 0.008 | 100 |
| Probabilities of extinction | 0.27(0.01) | y = 0.26+0.0002x | 0.01 | 0.257 | 93 | 0.32(0.004) | y = 0.33−0.0004x | 0.01 | 0.243 | 100 |
| Structure and richness | ||||||||||
| Cover according to life forms | ||||||||||
| Forbs (sqrt) | 1.1(0.05) | y = 0.85+0.01x | 0.25 | <0.001 | 92 | 1.34(0.04) | y = 1.66−0.01x | 0.12 | <0.001 | 100 |
| Grasses (sqrt) | 1.58(0.12) | y = 1.55+0.001x | 0.001 | 0.83 | 75 | 1.64(0.06) | y = 1.87−0.01x | 0.02 | 0.145 | 97 |
| Shrubs (sqrt) | 1.43(0.095) | y = 1.22+0.01x | 0.06 | 0.058 | 57 | 1.15(0.05) | y = 1.55−0.01x | 0.09 | 0.002 | 95 |
| Cover according to life history | ||||||||||
| Summer annuals (sqrt) | 1.03(0.06) | y = 0.86+0.01x | 0.08 | 0.007 | 88 | 1.51(0.04) | y = 1.76−0.01x | 0.06 | 0.018 | 100 |
| Winter annuals (sqrt) | 1.08(0.06) | y = 0.76+0.01x | 0.39 | <0.001 | 91 | 1.03(0.04) | y = 1.19−0.01x | 0.03 | 0.113 | 99 |
| Perennials (sqrt) | 1.5(0.09) | y = 1.40+0.003x | 0.01 | 0.319 | 83 | 1.45(0.04) | y = 1.88−0.01x | 0.16 | <0.001 | 100 |
| Cover according to distribution | ||||||||||
| Restricted (log) | 0.51(0.07) | y = 0.25+0.01x | 0.27 | 0.002 | 33 | 0.34(0.04) | y = 0.47−0.004x | 0.03 | 0.218 | 52 |
| Shared (log) | 0.43(0.03) | y = 0.37+0.002x | 0.07 | 0.01 | 92 | 0.5(0.01) | y = 0.65−0.01x | 0.22 | <0.001 | 100 |
| Species richness | 2.38(0.15) | y = 2.12+0.01x | 0.06 | 0.089 | 93 | 4.73(0.11) | y = 6.33−0.05x | 0.33 | <0.001 | 100 |
| Cover dominant species | 30.08(3.15) | 93 | 31.07(1.26) | 100 | ||||||
Some of the variables were logarithmically (log) or square root (sqrt) transformed.