Table 1 Post-hoc analysis results for general linear mixed effect model predictions for Bering Sea amphipods contribution based on “layer” (SC, SB) within each “age” (mothers; calves) and between “year and month” of sampling.

From: Isotopic composition of the eastern gray whale epidermis indicates contribution of prey outside Arctic feeding grounds

Prey location

index

Group A

Group B

Odds. ratio

SE

df

t.ratio

p value

Bering Sea

Mothers

feb_2011 SC

feb_2018 SC

6.32

2.04

86

5.70

0.00002

feb_2011 SC

jan_2019 SC

2.55

0.75

3.19

0.12630

feb_2011 SC

mar_2019 SC

4.99

1.50

5.36

0.00007

feb_2018 SC

jan_2019 SC

0.40

0.13

− 2.91

0.23720

feb_2018 SC

mar_2019 SC

0.79

0.25

− 0.74

1.00000

jan_2019 SC

mar_2019 SC

1.96

0.56

2.33

0.89728

feb_2011 SB

feb_2018 SB

6.32

2.04

5.70

0.00002

feb_2011 SB

jan_2019 SB

2.55

0.75

3.19

0.12630

feb_2011 SB

mar_2019 SB

4.99

1.50

5.36

0.00007

feb_2018 SB

jan_2019 SB

0.40

0.13

− 2.91

0.23720

feb_2018 SB

mar_2019 SB

0.79

0.25

− 0.74

1.00000

jan_2019 SB

mar_2019 SB

1.96

0.56

2.33

0.89728

Calves

feb_2011 SC

feb_2018 SC

6.32

2.04

86

5.70

0.00002

feb_2011 SC

jan_2019 SC

2.55

0.75

3.19

0.12630

feb_2011 SC

mar_2019 SC

4.99

1.50

5.36

0.00007

feb_2018 SC

jan_2019 SC

0.40

0.13

− 2.91

0.23720

feb_2018 SC

mar_2019 SC

0.79

0.25

− 0.74

1.00000

jan_2019 SC

mar_2019 SC

1.96

0.56

2.33

0.89728

feb_2011 SB

feb_2018 SB

6.32

2.04

5.70

0.00002

feb_2011 SB

jan_2019 SB

2.55

0.75

3.19

0.12630

feb_2011 SB

mar_2019 SB

4.99

1.50

5.36

0.00007

feb_2018 SB

jan_2019 SB

0.40

0.13

− 2.91

0.23720

feb_2018 SB

mar_2019 SB

0.79

0.25

− 0.74

1.00000

jan_2019 SB

mar_2019 SB

1.96

0.56

2.33

0.89728

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