Fig 1.
Density and distribution of foraging trips conducted by female macaroni penguins during brood-guard, 2001–2005.
Maps show South Georgia and 500m bathymetric contour lines. The edge of the continental shelf was taken at 500m (projection: South Georgia Lambert Conformal Conic). Density contour shown for 0.5% in black solid line, the acoustic survey area for krill is shown as a dashed box.
Table 1.
Annual sample size for tracking of macaroni penguins at Bird Island, South Georgia, with local krill densities (coefficient of variance), 2001–2005.
Fig 2.
Annual diving behaviour of macaroni penguins during brood-guard and annual fledging masses, 2001–2005 (boxes show mean ± interquartile range, whiskers indicate the reasonable extremes of the data and points are outliers).
A) mean maximum depth (m) of foraging dives per deployment; B) mean vertical distance travelled during the bottom phase of a dive (m) per deployment; C) population fledging masses (kg).
Fig 3.
The relationship between maximum distance travelled from the colony and trip duration for female macaroni penguins during brood-guard, 2001–2005.
Fig 4.
The relationship between macaroni penguin fledging mass and foraging trip duration during brood-guard, 2001–2005.