Table 1.
Summary movement, foraging and diving information for 2009 KI (n = 5) and 2005/2010 MI (n = 7) seals which migrated to the East Antarctic shelf region. The term forage denotes periods defined (using the covariate SSM) as ‘resident’ movement. Values represent mean ± s.d. (range) across individual animals.
| KI males (n = 5) | MI females (n = 7) | |
|---|---|---|
| percentage trip on shelf | 49 ± 15 (30–65) | 56 ± 20 (20–79) |
| daysa on shelf | 101 ± 31 (65–132) | 92 ± 40 (36–159) |
| percentage shelf time forage | 82 ± 13 (64–95) | 76 ± 30 (11–97) |
| no. forage events | 4 ± 1 (3–5) | 2.3 ± 1.1 (1–4) |
| no. shelf forage events | 3.2 ± 0.8 (2–4) | 1.6 ± 0.8 (1–3) |
| forage run lengths (daysa) | 32 ± 14 (12–46) | 47 ± 27 (17–103) |
| shelf forage run lengths (daysa) | 29 ± 15 (12–46) | 51 ± 30 (4–103) |
| percentage shelf dives benthicb | 75 ± 22 (43–95) | 78 ± 20 (42–97) |
| percentage shelf forage dives benthic | 76 ± 25 (40–100) | 81 ± 22 (44–100) |
aNote that ‘days’ actually represents model days, which are 12 h time steps. Behavioural switches of less than 2 time steps were discounted.
bBenthic diving was ascertained where the maximum dive per time step was within 50 m of the bathymetry for an estimated location, based on the fine-scale (2 min) ETOPO2 v. 2 grid from the National Oceanic and Atmospheric Administration National Geophysical Data Center (http://www.ngdc.noaa.gov/mgg/global/relief/ETOPO2/ETOPO2v2-2006/ETOPO2v2c/).