Table 1.
Summary of the tagged grey reef sharks and their movements detected by the acoustic receivers in Palmyra Atoll; mean values displayed in the table are presented with one standard deviation.
| all sharks | female | male | |
|---|---|---|---|
| number of individuals detected | |||
| 2011 | 27 | 20 | 7 |
| 2012 | 38 | 25 | 13 |
| 2013 | 33 | 22 | 11 |
| 2014 | 30 | 20 | 10 |
| total | 41 | 28 | 13 |
| number of movements ≤110 h | |||
| 2011 | 16 665 | 13 559 | 3106 |
| 2012 | 21 750 | 17 177 | 4573 |
| 2013 | 29 639 | 24 648 | 4991 |
| 2014 | 31 288 | 24 933 | 6355 |
| total | 99 342 | 80 317 | 19 025 |
| days at liberty between 2011 and 2014a | |||
| min | 21 | 21 | 40 |
| max | 1439 | 1437 | 1439 |
| mean (s.d.) | 985 (396) | 977 (410) | 1001 (380) |
| fork length (m) | |||
| min | 0.86b | 0.86b | 1.03 |
| max | 1.47b | 1.47b | 1.31 |
| mean (s.d.) | 1.18 (0.15)b | 1.21 (0.17)b | 1.13 (0.10) |
aDays at liberty are the number of days between an individual's first and last detection in the dataset.
bThe fork length for one female was missing, thus for the measurements of all sharks, n = 40, and for females, n = 27.