Geographical and temporal flexibility in the response to crosswinds by migrating raptors.

Klaassen, RaymondLund University,Lunds universitet,Evolutionär ekologi,Biologiska institutionen,Naturvetenskapliga fakulteten,Evolutionary ecology,Department of Biology,Faculty of Science (author)

Wind and ocean currents may potentially have important effects on travelling animals, as an animal which does not respond to lateral flow will be drifted from its intended direction of movement. By analysing daily movements of migrating ospreys Pandion haliaetus and marsh harriers Circus aeruginosus, as recorded by satellite telemetry, in relation to global wind data, we showed that these raptors allow on average 47 per cent drift. Furthermore, our analyses revealed significant geographical and temporal variation in the response to crosswinds. During some parts of the migration, the birds drifted and in other parts they compensated or even overcompensated. In some regions, the response of marsh harriers depended on the wind direction. They drifted when the wind came from one side and (over)compensated when the wind came from the opposite side, and this flexible response was different in different geographical regions. These results suggest that migrating raptors modulate their response to crosswinds at different places and times during their travels and show that individual birds use a much more varied repertoire of behavioural responses to wind than hitherto assumed. Our results may also explain why contrasting and variable results have been obtained in previous studies of the effect of wind on bird migration.

Hake, MikaelSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för naturvårdsbiologi,Department of Conservation Biology(Swepub:slu)51518 (author)
Strandberg, RoineLund University,Lunds universitet,Evolutionär ekologi,Biologiska institutionen,Naturvetenskapliga fakulteten,Evolutionary ecology,Department of Biology,Faculty of Science(Swepub:lu)zooe-rst (author)
Alerstam, ThomasLund University,Lunds universitet,Evolutionär ekologi,Biologiska institutionen,Naturvetenskapliga fakulteten,Evolutionary ecology,Department of Biology,Faculty of Science(Swepub:lu)zooe-tal (author)
Evolutionär ekologiBiologiska institutionen (creator_code:org_t)
Sveriges lantbruksuniversitet

In:Proceedings of the Royal Society B: Biological Sciences: The Royal Society278, s. 1339-13461471-29540962-8452

By the author/editor: Klaassen, Raymon ...; Hake, Mikael; Strandberg, Roin ...; Alerstam, Thomas

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Biological Scien ...; and Evolutionary Bio ...

NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...; and Environmental Sc ...

By the university: Lund University; Swedish University of Agricultural Sciences

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