ラジオテレメトリーから推定した索餌海域におけるハイイロミズナギドリの日周行動

概要

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Electric pulse transmitters were attached to five Sooty Shearwaters (Puffinus griseus), two Short-tailed Shearwaters (P. tenuirostris), one Buller's Shearwater (P. bulleri), one Laysan Albatross (Diomedea immutabilis), and one Black-footed Albatross (D. nigripes) on board a fisheries research vessel in the northern North Pacific in the summers of 1991 and 1992. The pulses from the transmitters were monitored using the Yagi antennas, and the daily activities of these birds were tracked. Tracking duration ranged from 0.5 to 75.3h and the movements during these periods were estimated from the vessel's track chart to be 2 to 367km. Flight speed in a horizontal direction for the Sooty Shearwater, Short-tailed Shearwater, and Laysan Albatross was estimated to be 0.36 to 0.51 (av. 0.43), 0.64,and 0.55 km・min^<-1>, respectively. Two different flight patterns were recognized. Either the bird followed a straight route and moved fast with a long-range flight or it moved slowly with a short-range flight, changing the bearing of its route continuously. It seemed that the first flight pattern was between foraging sites and that the second was flight within the foraging site. The birds often flew in the daytime, but stayed still on the sea surface during the night. The Sooty Shearwater which was tracked for the greatest duration, 75.3h, showed flying and diving actions around sunrise, noon, and sunset at the foraging site.
日本生態学会の論文