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. 2021 Feb 9;256:108995. doi: 10.1016/j.biocon.2021.108995

Table 2.

Generalised Linear Mixed-Model (GLMM) results showing the effects of COVID-19 restrictions on white shark (Carcharodon carcharias) and yellowtail kingfish (Seriola lalandi) residency index and activity space. SE = standard error; CI = confidence interval; df = degree of freedom. Significant results are highlighted in bold (Queiroz et al., 2019; Thums et al., 2018).

Parameter Coefficient SE 95% CI t-value df P-value
White shark (residency period)
Intercept 0.90 0.49 −0.07,1.86 1.82 40 0.069
COVID vs pre-COVID −0.58 0.63 −1.82,0.65 −0.93 40 0.354



Yellowtail kingfish (residency period)
Intercept 3.03 0.47 2.11,3.95 6.43 50 <0.001
COVID vs pre-COVID 0.26 0.57 −0.86,1.38 0.45 50 0.653



White shark (residency index)
Intercept 0.27 0.15 −0.04,0.57 1.75 77 0.083
Week 0.01 0.01 −0.01,0.03 1.19 77 0.239
Year (2017) 0.41 0.37 −0.32,1,14 1.11 77 0.27
Year (2018) −0.04 0.92 −1.88,1.80 −0.05 77 0.962
Year (2019) −0.27 0.32 −0.91,0.37 −0.85 77 0.397
Week ∗ year (2017) −0.03 0.02 −0.07,0.02 −1.25 77 0.217
Week ∗ year (2018) 0.00 0.05 −0.09,0.09 −0.03 77 0.978
Week ∗ year (2019) 0.02 0.02 −0.02,0.05 0.99 77 0.325



Yellowtail kingfish (residency index)
Intercept 0.71 0.1 0.52,0.91 7.26 207 <0.001
Week −0.01 0.01 −0.02,0.00 −2.11 207 0.036
Year (2019) −0.18 0.15 −0.47,0.11 −1.22 207 0.226
Week ∗ year (2019) 0.01 0.01 0.00,0.03 1.58 207 0.116



White shark (activity space)
Intercept 0.63 0.12 0.41,0.86 5.48 62 <0.001
Week −0.01 0.01 −0.02,0.00 −1.60 62 0.109
Year (2019) 0.02 0.24 −0.45,0.50 0.09 62 0.925
Week ∗ year (2019) −0.01 0.01 −0.03,0.02 −0.50 62 0.619



Yellowtail kingfish (activity space)
Intercept 0.78 0.1 0.58,0.99 −1.99 279 <0.001
Week 0.00 0.01 −0.01,0.01 −3.61 279 0.931
Year (2019) 0.32 0.12 0.08,0.56 −1.36 279 0.010
Week ∗ year (2019) −0.02 0.01 −0.03,-0.01 0.58 279 0.007