Table 1.

Fixed effects of generalized nonlinear mixed models describing mortality rate trends (10); a is the estimated annual fractional change in mortality rate (10) and n is the number of forest plots used in the model.

ModelData a SE P n
Mortality trend All plots 0.039 0.005 <0.0001 76
Mortality trend by region Pacific Northwest 0.042 0.006 <0.0001 47
California 0.028 0.009 0.0050 20
Interior 0.024 0.009 0.0319 9
Mortality trend by elevation class <1000 m 0.038 0.007 <0.0001 33
1000 to 2000 m 0.050 0.010 <0.0001 20
>2000 m 0.027 0.006 0.0003 23
Mortality trend by stem diameter class <15 cm 0.039 0.006 <0.0001 61
15 to 40 cm 0.040 0.006 <0.0001 76
>40 cm 0.033 0.007 <0.0001 76
Mortality trend by genus Abies 0.031 0.010 0.0025 62
Pinus 0.044 0.010 <0.0001 37
Tsuga 0.049 0.009 <0.0001 47
All other genera 0.032 0.008 <0.0001 64
Mortality trend by fire return interval <25 years 0.033 0.008 0.0009 15
25 to 250 years 0.040 0.006 <0.0001 32
>250 years 0.036 0.010 0.0008 29