Ecological Archives A018-067-A3

Matthew L. Keefer, Christopher C. Caudill, Christopher A. Peery, and Steven R. Lee. 2008. Transporting juvenile salmonids around dams impairs adult migration. Ecological Applications 18:1888–1900.

Appendix C. Two tables of logistic-regression model comparison statistics for adult chinook salmon and steelhead fallback behavior.

TABLE C1. Selection statistics for chinook salmon logistic-regression models where the dependent variable was adult fallback at any monitored dam (yes, no). Barge = transport or in-river; Origin = hatchery or wild; Adultyear = year adult fish were radio-tagged at Bonneville Dam; Adultdate = Julian date of adult tagging; Adultsite = release site downstream or in forebay of Bonneville Dam; Juvyear = year juvenile fish were PIT-tagged at Lower Granite Dam; Juvdate = Julian date of juvenile tagging; na = quasi-complete separation of data.

Model

df

AIC

∆AIC

AIC wi

Barge + Adultyear

4

298.03

0.00

0.330

Barge + Origin + Adultyear

5

298.89

0.86

0.215

Barge + Adultyear + Adultdate

5

299.54

1.51

0.155

Barge + Juvyear + Barge×Juvyear

5

299.68

1.65

0.144

Barge + Juvyear

3

301.83

3.80

0.049

Barge + Adultyear + Barge×Adultyear

7

302.00

3.98

0.045

Barge + Origin + Juvyear

4

303.28

5.25

0.024

Barge + Juvyear + Juvdate

6

303.77

5.74

0.019

Barge + Origin + Juvyear + Juvdate + Adultyear + Adultdate

9

305.39

7.36

0.008

Barge

1

307.64

9.61

0.003

Barge + Origin

2

308.46

10.43

0.002

Barge + Juvdate

2

308.96

10.94

0.001

Adultyear

3

309.16

11.14

0.001

Barge + Adultsite

2

309.46

11.43

0.001

Barge + Origin + Barge×Origin

3

309.59

11.56

0.001

Barge + Juvdate + Barge×Juvdate

3

310.96

12.94

0.001

Barge + Adultdate + Barge×Adultdate

3

311.15

13.12

0.000

Juvdate

1

314.05

16.03

0.000

Origin + Juvyear + Juvdate + Adultyear + Adultdate

8

317.71

19.68

0.000

Adultdate

1

318.98

20.96

0.000

Origin

1

319.00

20.97

0.000

Juvyear

2

319.10

21.07

0.000

Adultsite

1

na

na

na

Barge + Adultdate

2

na

na

na

Barge + Adultsite + Barge×Adultsite

3

na

na

na

 

TABLE C2. Selection statistics for steelhead logistic-regression models where the dependent variable was adult fallback at any monitored dam (yes, no) Barge = transport or in-river; Origin = hatchery or wild; Adultyear = year adult fish were radio-tagged at Bonneville Dam; Adultdate = Julian date of adult tagging; Adultsite = release site downstream or in forebay of Bonneville Dam; Juvyear = year juvenile fish were PIT-tagged at Lower Granite Dam; Juvdate = Julian date of juvenile tagging; na = quasi-complete separation of data.

Model

df

AIC

∆AIC

AIC wi

Barge + Adultyear + Barge×Adultyear

5

458.45

0.00

0.298

Barge + Adultyear

3

460.70

2.25

0.097

Barge + Juvyear

3

461.40

2.95

0.068

Barge

1

461.50

3.05

0.065

Barge + Adultyear + Adultdate

4

461.59

3.14

0.062

Barge + Adultdate

2

461.62

3.17

0.061

Barge + Adultdate + Barge×Adultdate

3

462.16

3.71

0.047

Barge + Juvdate + Barge×Juvdate

3

462.46

4.01

0.040

Barge + Juvyear + Juvdate

4

462.47

4.02

0.040

Barge + Origin + Adultyear

4

462.66

4.21

0.036

Barge + Origin + Barge×Origin

3

462.99

4.54

0.031

Barge + Juvdate

2

463.11

4.66

0.029

Adultyear

2

463.32

4.87

0.026

Barge + Origin + Juvyear

4

463.33

4.88

0.026

Barge + Origin

2

463.50

5.05

0.024

Juvyear

2

464.14

5.69

0.017

Adultdate

1

464.66

6.21

0.013

Barge + Juvyear + Barge×Juvyear

5

465.09

6.64

0.011

Juvdate

1

466.80

8.35

0.005

Origin

1

466.80

8.35

0.005

Adultsite

na

na

na

na

Barge + Adultsite

na

na

na

na

Barge + Adultsite + Barge×Adultsite

na

na

na

na

Barge + Origin + Juvyear + Juvdate + Adultyear + Adultdate

na

na

na

na

Origin + Juvyear + Juvdate + Adultyear + Adultdate

na

na

na

na


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