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- W1596499789 abstract "Eighteen Addie penguins Pygoscelis adeliae tending chicks at ArdleyIsland (62 13' S, 58'55' w), Antarctica during December 1991 and January 1992 wereequipped with multiple channel data loggers recording swim heading, speed and divedepth. These parameters were then equated together using vectors to calculate theforaging tracks of the birds at sea as well as depth utilisation. The deepest diverecorded was 97 m although most dives terminated within 70 m. In accordance withprevious studies, descent and ascent speed of diving birds increased with maximumdive depth and absolute time spent for the descent and ascent increased with maximumdive depth. The distance moved to the farthest point from the island was 35 kmalthough 70% of all time at sea was spent within 10 km of the island (all birdsconsidered together). Consideration of the fine scale features of bird movementindicated that three major patterns were apparent; (i) virtual straight line movement,(ii) a circular or spiralling movement where circles had diameters ranging between 20and 200 m and (iii) extensive movement without any substantial displacement. Atravel index (total distance travelled during a specified time divided by the straight linedistance covered during this time) showed that the three behaviours had very differentvalues. The frequency of occurrence of particular travel index values followed alogarithmic decay with straight line travel (with indices around 1) accounting for ca.35% of all movement at sea with greater deviations from a straight line courseoccurring less often. It is supposed that straight line travel serves displacement, highlylocalised movement reflects prey pursuit and that the circular or spiralling movementarises from birds seeking out prey using detection systems other than vision." @default.
- W1596499789 created "2016-06-24" @default.
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- W1596499789 date "2002-02-01" @default.
- W1596499789 modified "2023-09-24" @default.
- W1596499789 title "Movements in Adelie penguins foraging for chicks at Ardley Island, Antarctica; circles within spirals, wheels within wheels" @default.
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