Abstract
Abstract We used radio-transmitters to study year-round patterns of colony attendance and foraging trip duration of Shy Albatrosses (Thalassarche cauta) at Albatross Island (1995–1997) and Pedra Branca (1997), Tasmania, Australia. Colony activity was largely diurnal, and foraging trip, incubation, and brooding shift durations were relatively short throughout the breeding season, consistent with foraging just a few hundred kilometers from the colonies. Shift durations decreased from 2.9 days early in incubation to an average of 24 hr during brooding. Foraging trip durations were similarly short in the first month postbrooding, but then doubled thereafter to approximately 2 days. Attendance and foraging-trip characteristics were similar between years and at both breeding sites. Both early in incubation and late in chick-rearing, females tended to undertake longer foraging trips than males. There was also an increased probability of failure if females spent as much time on the nest as males during incubation...
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