Ecological Archives A024-025-A3

Liesl P. Erb, Chris Ray, Robert Guralnick. 2014. Determinants of pika population density vs. occupancy in the Southern Rocky Mountains. Ecological Applications 24:429–435. http://dx.doi.org/10.1890/13-1072.1

Appendix C. Models predicting pika density with ΔAIC < 2, along with the null model.

Table C1. Models predicting pika density with ΔAIC < 2, along with the null model. Key to predictor codes provided below model table.

Model

AIC

ΔAIC

N

Neg10 + Area

119.99

0

0.47

ForbSpp + Area

120.24

0.25

0.46

GF + Neg10 + Area

120.27

0.28

0.56

ForbCover + Area

120.36

0.37

0.45

GF + Area

120.37

0.38

0.45

MeanPrecip + GF + Area

120.42

0.43

0.56

ForbCover + Neg10 + Area

120.46

0.47

0.56

ForbSpp + Area + Rock.Veg

120.47

0.48

0.56

MeanPrecip + ForbCover + Area

120.95

0.96

0.55

MaxMean + GF + Area

121.05

1.06

0.54

ForbSpp + GF + Area

121.35

1.36

0.54

GF + JJATemp + Area

121.41

1.42

0.54

Area

121.42

1.43

0.30

ForbSpp + Neg10 + Area

121.71

1.72

0.53

 

 

 

Null (y~1)

124.97

4.98

 

 

Predictor Code

Predictor Description

Area

Patch area

ForbCover

Percent of vegetation consisting of forbs

ForbSpp

Forb species richness

GF

Gram:forb

JJATemp

Sub-surface summer average temperature

MaxMean

Surface summer maximum temperature

MeanPrecip

Mean annual precipitation

Neg10

Proportion of recorded sub-surface temperatures below -10° C

Rock.Veg

% rock cover multiplied by % vegetation cover


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