Table 2.
Effort and true detections for diel analysis by site and light regime. Odds-ratio, its 95% confidence intervals (CI), and the p-value of the GLM parameter estimates are all in comparison to Day for each site.
| Site | Light regime | Ice-free effort (hours) | True positive (hours) | % true | Odds-ratio | Odds-ratio 95% CI | GLM p-value |
|---|---|---|---|---|---|---|---|
| Prydz | Day | 808 | 46 | 5.7 | — | — | — |
| Dusk | 159 | 8 | 5.0 | 0.88 | 0.38–1.80 | 0.74 | |
| Night | 132 | 0 | 0.0 | 1.4 × 10−7 | 0–1012 | 0.98 | |
| Dawn | 139 | 8 | 5.8 | 1.01 | 0.43–2.08 | 0.98 | |
| Casey | Day | 3916 | 290 | 7.4 | — | — | — |
| Dusk | 585 | 28 | 4.8 | 0.63 | 0.41–0.92 | 0.02 | |
| Night | 1024 | 7 | 0.7 | 0.86 | 0.04–0.17 | 1.7 × 10−10 | |
| Dawn | 610 | 34 | 5.6 | 0.74 | 0.50–1.05 | 0.10 | |
| S. Kerguelen Plateau | Day | 8079 | 515 | 6.4 | — | — | — |
| Dusk | 1345 | 50 | 3.7 | 0.57 | 0.42–0.75 | 0.0002 | |
| Night | 3139 | 29 | 0.9 | 0.14 | 0.09–0.20 | <2 × 10−16 | |
| Dawn | 1316 | 50 | 3.8 | 0.58 | 0.43–0.77 | 0.0003 |