Menu

Javascript is not activated in your browser. This website needs javascript activated to work properly.
You are here

Orientation of shorebirds in relation to wind: both drift and compensation in the same region

Author:
  • Johanna Grönroos
  • Martin Green
  • Thomas Alerstam
Publishing year: 2013
Language: English
Pages: 385-392
Publication/Series: Journal für Ornithologie1852-12-31+01:002004-01-01+01:00
Volume: 154
Issue: 2
Document type: Journal article
Publisher: Springer

Abstract english

Migratory movements in air or water are strongly affected by wind and ocean currents and an animal which does not compensate for lateral flow will be drifted from its intended direction of movement. We investigated whether arctic shorebirds during autumn migration in the region of South Sweden and the southern Baltic Sea compensate for wind drift or allow themselves to be drifted when approaching a known goal area under different circumstances (over sea, over land, at low and high altitude) using two different approaches, visual telescope observations and tracking radar. The shorebirds showed clearly different responses to crosswinds along this short section (<200 km) of the migratory journey, from almost full drift when departing over the sea, followed by partial drift and almost full compensation at higher altitudes over land during later stages. Our study demonstrates that shorebirds are also remarkably variable in their response to crosswinds during short sections of their migratory journey. The recorded initial drift close to departure is probably not adaptive but rather a result of constraints in the capacity of the birds to compensate in some situations, e. g. in low-altitude climbing flight over the sea. We found no difference in orientation response to wind between adult and juvenile birds. This study indicates, in addition to adaptive orientation responses to wind, the importance of the non-adaptive wind drift that contributes to increasing the variability of drift/compensation behaviour between places that are separated by only short distances, depending on the local topographic and environmental conditions.

Keywords

  • Ecology
  • Biological Sciences
  • Migration
  • Orientation
  • Wind drift
  • Compensation
  • Shorebird

Other

Published
  • BECC
  • ISSN: 1439-0361
Thomas Alerstam
E-mail: thomas [dot] alerstam [at] biol [dot] lu [dot] se

Professor emeritus

Evolutionary ecology

+46 46 222 37 85

E-C225

Sölvegatan 37, Lund

50

Centre for Animal Movement Research
Evolutionary Ecology, Department of Biology
Ecology building S-223 62 Lund Sweden