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Table 4 Summary of generalized additive models to predict core space characteristics

From: Juvenile Steller sea lion (Eumetopias jubatus) utilization distributions in the Gulf of Alaska

Response Variable

df

AIC

ΔAIC

weight

(a) Core Area

 Region + s(Season:Region)

8

537.3

0.00

0.50

 Region

5

537.9

0.60

0.49

(b) Core area (w/age)

 Region

5

278.35

0.00

1

(c) Minimum Distance Core-Haulout

 s(Season:Region) + Region + Sex + Region:Sex

11

1671.06

0.00

0.56

 s(Season:Region) + Region

8

1673.63

2.57

0.23

 s(Season) + Region + Sex + Region:Sex

9

1675.86

4.80

0.07

 Region + Sex + Region:Sex

8

1676.43

5.37

0.07

 S(Season:Region)

6

1676.51

5.45

0.06

(d) Minimum Distance Core-Haulout (w/age)

 Season + Region + Season:Region

11

840.54

0.00

0.88

(e) Intensity

 Sex + s(Season:Region)

8

293.80

0.00

0.58

 s(Season:Region)

6

294.60

0.80

0.42

(f) Intensity (w/age)

 Season

5

168.04

0.00

0.92

  1. Models presented are those included in our final model set based on criteria <Δ6 AIC and not a nested version of a simpler model [53]). Variables preceded by an s indicate the factor was included as a smoothed factor with a cyclic cubic regression spline