Table 3. Various parameters related to buzzes and calls.
Buzzes only include those made by the tagged whale, whereas calls include those made by the tagged whale and other nearby whales. The calculation of mean buzzing and calling rates omitted the post-release silent period. A few calls in Thora’s and Eistla’s records, which took place before the tagged narwhal started clicking, were excluded (see Fig 3). IQR = inter-quartile range, NA = not applicable. All depths are in meters. Buzz durations are based on 35 analyzed buzzes per whale, and 18 for Mára.
| Whale | B U Z Z E S | C A L L S | ||||||
|---|---|---|---|---|---|---|---|---|
| n | Buzzes / h | Depth | Duration | n | Calls / h | Depth | ||
| Mean | Max | Mean ± SD (min-max) |
Median (s) (IQR) |
Mean ± SD (median) |
||||
| Freya | 645 | 20.5 | 72 | 319 ± 148 (14–657) |
2.5 (1.7–3.2) |
39 | 1.2 | 25.1 ± 38.1 (6.7) |
| Thora | 4301 | 47.0 | 250 | 325 ± 175 (2–847) |
1.5 (1.1–1.9) |
768 | 8.3 | 39.7 ± 70.8 (5.5) |
| Mára | 18 | 18.1 | 18 | 361 ± 144 (115–557) |
2.3 (1.6–3.2) |
1 | NA | NA |
| Frida | 887 | 15.9 | 119 | 171 ± 135 (0–540) |
2.7 (1.9–3.5) |
149 | 2.7 | 29.2 ± 57.1 (12.5) |
| Eistla | 2798 | 33.7 | 89 | 391 ± 151 (5–816) |
2.7 (1.7–4.1) |
530 | 6.1 | 30.8 ± 73.6 (1.3) |
| Balder | 4587 | 36.0 | 175 | 374 ± 107 (96–808) |
2.7 (2.3–3.7) |
148 | 1.1 | 34.4 ± 63.1 (2.0) |