Table 4.
Inter-deep dive intervals and dive rates for Cuvier's beaked whales off Cape Hatteras. Medians and means are given for each individual, along with coefficients of variation for the mean (CV). The group median, mean and CV are given under ‘total’. Inter-deep dive intervals were only calculated for periods with continuous behaviour records between deep dives; records with gaps were not used. Inter-deep dive intervals were calculated in both minutes (IDDI min) and as the number of shallow dives between deep dives (IDDI number); maximum values are given for both. Durations were not calculated for ZcTag050 due to probable errors of undersampling surfacings. Dive rates are calculated as the number of dives of each type divided by total hours of data recorded.
| tag ID | IDDI (min), median mean (CV) |
IDDI (min) maximum |
IDDI (number) median mean (CV) |
IDDI (number) maximum |
deep dive rate (dives h−1) | shallow dive rate (dives h−1) |
|---|---|---|---|---|---|---|
| ZcTag029 | 87.9 98.3 (53.9) |
310.0 | 4.0 3.7 (53.9) |
9 | 0.36 | 1.49 |
| ZcTag030 | 80.8 84.6 (50.0) |
222.9 | 3.5 3.5 (53.6) |
9 | 0.42 | 1.53 |
| ZcTag038 | 89.5 92.2 (39.7) |
337.3 | 4.0 3.7 (44.6) |
14 | 0.39 | 1.44 |
| ZcTag040 | 58.5 62.0 (45.8) |
107.1 | 2.0 2.5 (42.8) |
4 | 0.52 | 1.22 |
| ZcTag041 | 55.7 59.3 (49.7) |
202.9 | 2.0 2.5 (59.1) |
8 | 0.49 | 1.24 |
| ZcTag042 | 74.0 74.4 (48.0) |
168.3 | 3.0 3.0 (51.7) |
7 | 0.44 | 1.45 |
| ZcTag046 | 38.5 38.9 (67.1) |
100.3 | 2.0 1.7 (74.4) |
5 | 0.61 | 1.29 |
| ZcTag048 | 56.3 60.6 (66.5) |
209.0 | 3.0 2.8 (66.3) |
9 | 0.50 | 1.53 |
| ZcTag050 | — | — | — | — | — | — |
| ZcTag051 | 53.5 67.9 (59.2) |
182.5 | 1.0 1.1 (86.4) |
4 | 0.48 | 0.57 |
| total | 74.6 76.6 (53.7) |
337.3 | 3.0 3.0 (59.0) |
14 | 0.43 | 1.40 |