On-line Supporting Information for:
Pilliod, D.S., B.R. Hossack, P.F. Bahls, E.L. Bull, P.S. Corn, G. Hokit, B.A. Maxell, J.C. Munger, & A. Wyrick. 20xx. Nonnative
salmonids affect amphibian occupancy at multiple spatial scales. Diversity and Distributions x:xx-xx.
Appendix S1. Generalized additive model (GAM) results for long-toed salamander (Ambystoma macrodactylum) occupancy in large
catchments and Columbia spotted frog (Rana luteiventris) occupancy in small and large catchments.
Table S1. Models predicting the occurrence of Ambystoma macrodactylum breeding at a large catchment.
Model Name
Size
Full
Size + Fish status
Full + Fish status
Isolation
Isolation + Fish status
Elevation
Elevation + Fish status
Model Parameters
SITES + AREA
SITES + AREA + aELEV + aDIST
SITES + AREA + FISHSTATUS
SITES + AREA + aELEV + aDIST + FISHSTATUS
aDIST
aDIST + FISHSTATUS
aELEV
aELEV + FISHSTATUS
k
Deviance
ΔAICc
wi
4
9
5
10
3
4
2
3
93.0
83.4
93.0
83.4
107.5
105.5
110.2
108.3
0.00
1.12
2.11
3.51
12.39
12.54
13.34
13.60
0.477
0.272
0.166
0.082
0.001
0.001
0.001
0.001
k
Deviance
ΔAICc
wi
4
5
10
11
5
4
3
2
389.1
388.0
381.8
381.0
412.4
417.6
421.0
429.1
0.00
0.96
4.48
5.83
24.78
27.92
29.85
35.94
0.562
0.347
0.060
0.030
0.000
0.000
0.000
0.000
Table S2. Models predicting the occurrence of Rana luteiventris breeding at a small catchment.
Model Name
Size
Size + Fish status
Full
Full + Fish status
Isolation + Fish status
Isolation
Elevation + Fish status
Elevation
Model Parameters
SITES + AREA
SITES + AREA + FISHSTATUS
SITES + AREA + aELEV + aDIST
SITES + AREA + aELEV + aDIST + FISHSTATUS
aDIST + FISHSTATUS
aDIST
aELEV + FISHSTATUS
aELEV
1
Table S3. Models predicting the occurrence of Rana luteiventris breeding at a large catchment.
Model Name
Size + Fish status
Isolation + Fish status
Size
Elevation + Fish status
Full + Fish status
Full
Isolation
Elevation
Model Parameters
SITES + AREA + FISHSTATUS
aDIST + FISHSTATUS
SITES + AREA
aELEV + FISHSTATUS
SITES + AREA + aELEV + aDIST + FISHSTATUS
SITES + AREA + aELEV + aDIST
aDIST
aELEV
k
Deviance
ΔAICc
wi
5
5
4
3
11
10
4
2
139.0
143.4
147.0
149.3
133.1
141.1
154.9
167.0
0.00
4.77
5.80
6.17
7.82
13.50
14.12
21.78
0.823
0.076
0.045
0.038
0.016
0.001
0.001
0.000
2
Figure S1 Estimated effect of landscape variables on probability of long-toed salamander (Ambystoma macrodactylum) breeding
occupancy in 114 large catchments in the northern Rocky Mountains. The dotted lines or error bars in each plot are approximate 95%
pointwise confidence intervals (C.I.). Hatch marks at the bottom of each graph represent data points. Significance is indicated when
estimated 95% C.I.s fall completely above or below the no-effect line at zero (light grey horizontal line). A vertical light grey line
drawn down to the x-axis indicates an approximate threshold in the predictor variable where effects on occupancy transition from
positive to negative or vice versa.
3
Figure S2 Estimated effect of landscape variables on probability of Columbia spotted frog (Rana luteiventris) breeding occupancy in
315 small catchments in the northern Rocky Mountains. The dotted lines or error bars in each plot are approximate 95% pointwise
confidence intervals (C.I.). Hatch marks at the bottom of each graph represent data points. Significance is indicated when estimated
95% C.I.s fall completely above or below the no-effect line at zero (light grey horizontal line). A vertical light grey line drawn down
to the x-axis indicates an approximate threshold in the predictor variable where effects on occupancy transition from positive to
negative or vice versa.
4
Figure S3 Estimated effect of landscape variables on probability of Columbia spotted frog (Rana luteiventris) breeding occupancy in
149 large catchments in the northern Rocky Mountains. The dotted lines or error bars in each plot are approximate 95% pointwise
confidence intervals (C.I.). Hatch marks at the bottom of each graph represent data points. Significance is indicated when estimated
95% C.I.s fall completely above or below the no-effect line at zero (light grey horizontal line). A vertical light grey line drawn down
to the x-axis indicates an approximate threshold in the predictor variable where effects on occupancy transition from positive to
negative or vice versa.
5