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Table 7 Best fit models (i.e., models with lowest AICc) and importance weights for predictor variables for shrub species presence in all plots and in all unburned plots in Yosemite National Park, California, USA (1991 to 2017). Species listed occurred in five or more plots for all plots and unburned plots, respectively. Models are defined in Table 1 and slope coefficients are displayed for BURN and FRID when in the best-fit model. The coefficients represent the change in log odds of occurrence for every 10-unit increase in FRID. Important effects are indicated by positive (+) and negative (–) symbols according to the sign of their coefficients for AET or Deficit effects, or by asterisks (*) for BURN and FRID effects. Single sign denotes significance (variable importance >0.7 and P value <0.05), double sign denotes strong significance (variable importance >0.9 and P value <0.01), zero (0) or ns denotes non-significance (variable importance <0.7 or P value >0.05), and n/a denotes that the variable did not occur in the best model

From: The distribution of woody species in relation to climate and fire in Yosemite National Park, California, USA

 

Model

AET

AET2

Deficit

Deficit2

BURN

Model

AET

AET2

Deficit

Defici2

FRID

Species

All plots

Unburned plots

Arctostaphylos nevadensis

1b

0

0

0

0

n/a

1b

0

0

0

0

n/a

Arctostaphylos patula

2b

0

0

+

– –

1.042**

1b

0

0

+

n/a

Arctostaphylos viscida

2b

0

+

++

0

0.592ns

3a

0

n/a

++

n/a

1.109*

Artemisia rothrockii

1b

0

0

0

0

n/a

1b

0

0

0

0

n/a

Artemisia tridentata

1b

0

0

0

0

n/a

1b

0

0

0

0

n/a

Ceanothus cordulatus

2b

++

– –

0

1.703**

1b

+

0

0

n/a

Ceanothus cuneatus

1b

0

0

0

0

n/a

1b

0

0

0

0

n/a

Ceanothus integerrimus

2a

++

n/a

++

n/a

1.541**

1a

++

n/a

+

n/a

n/a

Cercocarpus betuloides

2b

0

0

0

0

–16.791ns

1b

0

0

0

0

n/a

Chamaebatia foliolosa

2a

++

n/a

0

n/a

1.144**

3a

++

n/a

0

n/a

1.383**

Chrysolepis sempervirens

1b

0

0

0

– –

n/a

1b

0

0

+

– –

n/a

Holodiscus discolor

2b

0

0

0

– –

–15.544ns

1b

0

0

0

– –

n/a

Prunus emarginata

1b

0

0

+

n/a

1b

0

0

+

n/a

Quercus vacciniifolia

1b

– –

0

n/a

3b

– –

0

0

– –

–1.535ns

Salix orestera

1a

0

n/a

0

n/a

n/a

1a

0

n/a

0

n/a

n/a

Salix scouleriana

2b

0

0

0

0

2.283**

n/a

n/a

n/a

n/a

n/a

n/a