Table 3 Model coefficients for linear mixed effect model of ice concentrations before winter migration.

From: Interannual site fidelity by Svalbard walruses

 

Predictor

Value

SE

df

t-value

p-value

Tagged at Lågøya

Intercept

0.114

0.040

236

2.855

0.005

Year 2017

 − 0.095

0.037

236

 − 2.551

0.011

Year 2018

0.235

0.108

236

2.187

0.030

Year 2019

 − 0.067

0.073

236

 − 0.924

0.356

Year 2020

0.286

0.162

236

1.772

0.078

Year 2021

0.060

0.067

236

0.892

0.373

Period

 − 0.006

0.015

236

 − 0.371

0.711

Tagged at Sletteøya

Intercept

57.873

11.028

118

5.248

0.000

Year 2016

 − 59.669

8.001

118

 − 7.458

0.000

Year 2017

 − 43.697

11.193

118

 − 3.904

0.000

Year 2018

 − 25.147

13.297

118

 − 1.891

0.061

Period

8.627

5.036

118

1.713

0.089

  1. The model was tested on two periods 14–8 vs 7–1 days before migrating to the wintering areas and was applied separately for the walruses tagged at Lågøya (northern Svalbard) and at Sletteøya (southern Svalbard).
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