Table 1.
Overview of individual-, capture/tagging- and movement-related information for each of the six harbour porpoises equipped with a V-tag during this study
| Harbour porpoise ID | ||||||
|---|---|---|---|---|---|---|
| ID 1 | ID 2 | ID 3 | ID 4 | ID 5 | ID 6 | |
| Sex | Female | Female | Male | Male | Male | Male |
| Standard length (cm) | 138 | 139 | 134 | 120 | 140 | 130 |
| Tagging area | Skagerrak | Skagerrak | Skagerrak | Wadden Sea | Wadden Sea | Wadden Sea |
| ARGOS no. | 2015-149159 | 2015-149160 | 2015-149162 | 2014-138067 | 2016-149166 | 2016-149167 |
| V-tag version | 2 | 2 | 3 | 2 | 2 | 2 |
| Location data available | Yes | Yes | Yes | Yes | Yes | Yes |
| Dive data available | Yes | Yes | Yes | Yes | Yes | No |
| Tagging date (d/m/y) | 02/11/2015 | 02/11/2015 | 20/11/2015 | 03/06/2014 | 19/09/2016 | 19/09/2016 |
| No. of days tagged | 11 | 9 | 11 | 7 | 7 | 12 |
| Total no. of GPS locations acquired | 919 | 1138 | 1210 | 1353 | 594 | 1312 |
| Average no. of GPS locations acquired h−1 | 3.8 | 5.7 | 4.7 | 9.6 | 3.7 | 4.8 |
| Total no. of dives recorded (> 2 m, > 10 s) | 9160 | 9674 | 15623 | 4575 | 8297 | − |
| Average no. of dives h−1 | 38.2 | 48.6 | 53.1 | 32.4 | 52.2 | − |
The V-tag is a custom-made high-density closed cell foam package containing GPS, TDR, VHF, and ARGOS units. The V-tag version 2 had a weight of 150 g and version 3 was 135 g. Note that ID 6 did not have a functioning TDR (dive recorder) unit