Parameters used to model energy and prey consumption by foraging Magellanic penguins
| Parameter . | Value . | Source . |
|---|---|---|
| Mass of Magellanic penguin | 4 kg | Williams (1995) |
| Time spent swimming during searching (%) | 76% | This paper |
| Swim speed during searching | 1.77 m s-1 | Wilson et al. (2002) |
| Power to swim during searching | 50.7 W | This paper |
| Time resting during searching (%) | 24% | This paper |
| Resting metabolic rate | 23.6 W | Luna-Jorquera and Culik (2000) |
| Time swimming during patch exploitation (%) | 83% | This paper |
| Swim speed during prey pursuit | 2.25 m s-1 | Wilson et al. (2002) |
| Power used during prey pursuit | 81.9 W | This paper |
| Time resting during searching (%) | 17% | This paper |
| Mean time spent searching between patches | 36.3 min | This paper |
| Mean no. of dives spent exploiting patch | 2.7 | This paper |
| Prey ingestion rates during pursuit | 20 g dive-1 | This paper |
| Energy content of prey (anchovy) — wet mass | 5.5 kJ g-1 | South African Fisheries Industrial Research Institute(1980), FitzPatrick et al.(1988) |
| Assimilation efficiency (%) | 77% | Cooper (1977), Guerra(1992) |
| Overall energy gain from prey | 4.24 kJ g-1 | Derived — this paper |
| Energy gain during pursuit | 84.8 kJ dive-1 | Derived — this paper |
| Body oxygen stores | 238 ml | Culik et al. (1994a) |
| Parameter . | Value . | Source . |
|---|---|---|
| Mass of Magellanic penguin | 4 kg | Williams (1995) |
| Time spent swimming during searching (%) | 76% | This paper |
| Swim speed during searching | 1.77 m s-1 | Wilson et al. (2002) |
| Power to swim during searching | 50.7 W | This paper |
| Time resting during searching (%) | 24% | This paper |
| Resting metabolic rate | 23.6 W | Luna-Jorquera and Culik (2000) |
| Time swimming during patch exploitation (%) | 83% | This paper |
| Swim speed during prey pursuit | 2.25 m s-1 | Wilson et al. (2002) |
| Power used during prey pursuit | 81.9 W | This paper |
| Time resting during searching (%) | 17% | This paper |
| Mean time spent searching between patches | 36.3 min | This paper |
| Mean no. of dives spent exploiting patch | 2.7 | This paper |
| Prey ingestion rates during pursuit | 20 g dive-1 | This paper |
| Energy content of prey (anchovy) — wet mass | 5.5 kJ g-1 | South African Fisheries Industrial Research Institute(1980), FitzPatrick et al.(1988) |
| Assimilation efficiency (%) | 77% | Cooper (1977), Guerra(1992) |
| Overall energy gain from prey | 4.24 kJ g-1 | Derived — this paper |
| Energy gain during pursuit | 84.8 kJ dive-1 | Derived — this paper |
| Body oxygen stores | 238 ml | Culik et al. (1994a) |