Appendix F. Multiple regressions of rodent densities in grass- and shrub-dominated vegetation against annual and seasonal precipitation from current and previous years between 1989 and 2004. Statistically significant predictors are presented in bold.
|
df |
SS |
MS |
F |
P |
Variable |
Estimate |
Std. Error |
t |
P |
Shrub |
|
|
|
|
|
|
|
|
|
|
R2 = 0.44 |
|
|
|
|
|
|
|
|
|
|
Model |
2 |
0.222 |
0.111 |
5.154 |
0.023 |
Intercept |
0.580 |
0.146 |
3.980 |
0.002 |
Error |
13 |
0.280 |
0.022 |
|
|
Annual precipitation |
0.001 |
0.000 |
2.560 |
0.024 |
C. Total |
15 |
0.502 |
|
|
|
Annual precipitation previous year |
0.001 |
0.000 |
2.370 |
0.034 |
R2 = 0.55 |
|
|
|
|
|
|
|
|
|
|
Model |
4 |
0.274 |
0.068 |
3.300 |
0.052 |
Intercept |
0.548 |
0.145 |
3.770 |
0.003 |
Error |
11 |
0.228 |
0.021 |
|
|
Summer |
0.001 |
0.001 |
1.010 |
0.333 |
C. Total |
15 |
0.502 |
|
|
|
Winter-spring |
0.001 |
0.001 |
1.870 |
0.088 |
|
|
|
|
|
|
Summer previous year |
0.002 |
0.001 |
2.570 |
0.026 |
|
|
|
|
|
|
Winter-spring previous year |
0.000 |
0.001 |
0.090 |
0.932 |
Grass |
|
|
|
|
|
|
|
|
|
|
R2 = 0.06 |
|
|
|
|
|
|
|
|
|
|
Model |
2 |
0.054 |
0.027 |
0.403 |
|
Intercept |
0.449 |
0.416 |
1.080 |
0.302 |
Error |
12 |
0.811 |
0.068 |
|
0.677 |
Annual precipitation |
0.001 |
0.001 |
0.730 |
0.478 |
C. Total |
14 |
0.866 |
|
|
|
Annual precipitation previous year |
0.001 |
0.001 |
0.670 |
0.517 |
R2 = 0.49 |
|
|
|
|
|
|
|
|
|
|
Model |
4 |
0.425 |
0.106 |
2.415 |
0.118 |
Intercept |
0.653 |
0.369 |
1.770 |
0.107 |
Error |
10 |
0.440 |
0.044 |
|
|
Summer |
0.000 |
0.001 |
-0.450 |
0.662 |
C. Total |
14 |
0.866 |
|
|
|
Winter-spring |
0.001 |
0.001 |
0.870 |
0.406 |
|
|
|
|
|
|
Summer previous year |
0.002 |
0.001 |
2.020 |
0.071 |
|
|
|
|
|
|
Winter-spring previous year |
-0.002 |
0.001 |
-1.280 |
0.228 |