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© 1997 International Society for Behavioral Ecology

research-article

Regulation of foraging trips and costs of incubation shifts in the Antarctic petrel (Thalassoica antarctica)

Torkild Tveraaa, Svein-Håkon Lorenstenb and Bernt-Erik Sætherb

aNorwegian Institute for Nature Research, Department of Arctic Ecology Storgata 25, N-9005 Tromsø,Norway bNorwegian Institute for Nature Research Tungasletta 2, N-7005 Trondheim, Norway

ABSTRACT

In species where incubation is shared by both parents, the mate's ability to fast on the nest may constrain the time available for foraging. The decision to return to the nest should therefore be a compromise between an animal's own foraging success and its mate's ability to fast on the nest. To examine how the body conditions of incubating Antarctic petrels, Thalassoica antarctica, influence both the length of foraging trips and incubation shifts, we experimentally handicapped females by increasing their flight costs during a foraging trip by adding lead weights to their legs. Handicapped females spent more time at sea and had lower body conditions at arrival to the colony than controls, and, moreover, females in poor body condition at arrival to the colony spent generally more time at sea than those with higher body condition. The prolonged time period spent at sea by handicapped females was associated with higher desertion rates than among controls. The time the incubating mates fasted increased with their body condition at arrival to the colony, suggesting that a high body condition of the incubating bird may reduce the probability of nest desertion. Accordingly, our results suggest that the time spent foraging is adjusted to the body conditions of both the foraging and incubating mate.

Key words: Antarctica, Antarctic petrel, body condition, foraging, incubation costs, Thalassoica antarctica.


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