Migratory flight strategies of Levant sparrowhawks: time or energy minimization?
Article Abstract:
Radar was used to monitor the flight strategies of 364 Levant sparrowhawks, Accipiter brevipes, during the day and at night. Soaring-gliding predominates as the flight strategy during the day. Flapping-gliding strategies were also employed. The birds maximize cross-country air speed and minimize flight time when using a gliding strategy while energy consumption is minimized during flapping strategies by adjusting their airspeed with the wind. The flight strategy patterns with the availability of food en route is discussed.
Publication Name: Animal Behaviour
Subject: Zoology and wildlife conservation
ISSN: 0003-3472
Year: 1998
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Development of sunset orientation in migratory bird: no calibration by the magnetic field
Article Abstract:
The ontogeny of visual orientation mechanisms in the Savannah sparrow, Passerculus sandwichensis, was analyzed to determine the effects of sunset orientation mechanisms on the interaction of magnetic and visual cues. Analysis of visual orientation in Savannah sparrow indicated the influential role of celestial orientation on the development of visual and magnetic orientation night-migrating birds. Furthermore, repeated exposure of the sparrows to a static polarized light pattern affected magnetic calibrations.
Publication Name: Animal Behaviour
Subject: Zoology and wildlife conservation
ISSN: 0003-3472
Year: 1997
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Redstarts, Phoenicurus phoenicurus, can orient in a true-zero magnetic field
Article Abstract:
True-zero magnetic field orientation funnel experiments with a semi-randomized block design were used to test the orienting abilities of 47 redstarts, Phoenicurus phoenicurus, during the first autumn migration of the subjects. Results reveal that redstarts are able to orient themselves even with an absent magnetic field so long as there are celestial cues available. There is enhanced migratory activity and better orientation in this species with starry skies.
Publication Name: Animal Behaviour
Subject: Zoology and wildlife conservation
ISSN: 0003-3472
Year: 1998
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