Bringing data to the surface: recovering data loggers for large sample sizes from marine vertebrates

Table 1 Estimated swimming displacement and bearings of tagged sharks by species

Species	n tagged (recovered)	n used in displacement analysis	Swimming displacement range (km day⁻¹)	Mean swimming displacement ± SD (km day⁻¹)	Bearing range (°)	Mean bearing ± SD (°)
Blacktip	77 (75)	33	0.5–63	21* ± 15	12–334	219 ± 86
Tiger	45 (44)	37	1–55	27** ± 15	7–332	230 ± 65
Sandbar	41 (41)	30	2–72	33** ± 19	149–318	244 ± 42
Spinner	11 (10)	3	17–41	29 ± 12	184–276	238 ± 48
Bull	11 (11)	9	0.25–79	27 ± 28	161–351	287 ± 78
Hammerhead	7 (6)	2	4–5	5* ± 0.4	149–324	236 ± 124
Dusky	1 (1)	1	47	47	281	281
All Sharks	193 (188)	115	0.25–79	27 ± 18	7–351	236 ± 70

Displacement and bearing information were calculated based only on sharks that survived longline capture and were swimming for the duration of the deployment. Packages that were attached to sharks for less than 6 h or had an estimated floating displacement greater than the total displacement were also excluded. Asterisks denote significant differences in displacement distances (Dunn test p < 0.05), with blacktips and hammerheads showing shorter displacement than tiger and sandbar sharks

ISSN: 2050-3385