Appendix C. Statistical tables for repeated-measures (2 years) mixed-effects models at specific study areas. See Notes at end of tables for details.
Dependent variable and location
Independent
variablesNum df
Den df
F
P
A) Perennial grass aboveground production (log transformed), arid Patagonian steppe (Río Mayo)
distance
3
16
0.07
0.97
year
1
16
9.43
0.007
B) Palatable perennial grass aboveground production (log transformed), arid Patagonian steppe (Río Mayo)
distance
3
18
6.73
0.003
C) Shrub aboveground production (log transformed), arid Sagebrush steppe (WanapumState Park)
distance
3
12
15.39
<0.001
year
1
12
22.00
<0.001
radiation
1
12
17.21
0.001
D) Shrub aboveground production (log transformed), semiarid Sagebrush steppe (Ellensburg)
distance
3
18
3.34
0.043
E) Shrub aboveground production (log transformed), arid Patagonian steppe (Río Mayo)
distance
3
17
0.047
0.71
F) Total aboveground production (log transformed), arid Sagebrush steppe (WanapumState Park)
distance
3
14
3.93
0.032
G) Total aboveground production (log transformed), semiarid Sagebrush steppe (Ellensburg)
distance
3
16
3.59
0.037
radiation
1
16
4.87
0.042
sand
1
16
4.72
0.045
H) Total aboveground production (log transformed), arid Patagonian steppe (Río Mayo)
distance
3
17
0.29
0.83
year
1
17
18.51
<0.001
Notes: “Distance” refers to distance-from-water class, “radiation” is potential radiation based on slope and aspect, and “sand” is percentage sand in the surface soil. Sampling “year” was dropped from the model when it had no significant effect.