Flight strategies in migrating birds: when and how to fly
Wind has a profound influence on migrating birds since it inevitably will influence travel time and energy expenditure. In this thesis I investigate how migrating birds are affected by, and use winds. The studies cover the following main topics: i) the influence of wind on the decision to depart on...
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Format: | Doctoral or Postdoctoral Thesis |
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Martin Green, Dept. of Animal Ecology, Ecology Building, S-223 62 Lund, Sweden
2003
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Online Access: | https://lup.lub.lu.se/record/465397 |
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ftulundlup:oai:lup.lub.lu.se:b190cf4a-18b4-42fc-93c3-6e0f1b1e9a9a 2023-05-15T15:03:40+02:00 Flight strategies in migrating birds: when and how to fly Green, Martin 2003 https://lup.lub.lu.se/record/465397 eng eng Martin Green, Dept. of Animal Ecology, Ecology Building, S-223 62 Lund, Sweden https://lup.lub.lu.se/record/465397 urn:isbn:91-7105-183-X Ecology geese waders terns Animal ecology Djurekologi wind tunnel radio telemetry satellite telemetry radar formation flight flight speed adjustment wind drift energy savings departure decisions bird migration wind thesis/doccomp info:eu-repo/semantics/doctoralThesis text 2003 ftulundlup 2023-02-01T23:31:06Z Wind has a profound influence on migrating birds since it inevitably will influence travel time and energy expenditure. In this thesis I investigate how migrating birds are affected by, and use winds. The studies cover the following main topics: i) the influence of wind on the decision to depart on a migratory flight, and possible energy savings by choosing to migrate in tailwinds, ii) the effect of wind on flight directions, i.e. wind drift and compensation, and iii) how flight speed (airspeed) is affected by different wind conditions. Brent geese were found to consistently select migration days with following winds during a multi-step, 5000 km migration from Western Europe to Siberia. Arctic waders passing over South Sweden were found to use strong following winds at high altitudes, with a potential for large savings in flight time and energy expenditure. A more detailed analysis revealed that the waders chose better than average days with respect to winds for their several thousand km long flights. By doing so they gained savings in time and energy exceeding 25% compared to a flight in still conditions. Compared to average conditions the savings were in the order of 5-10%. Arctic geese were found to drift partially with the wind during overland migration. Waders were also found to drift with the wind to a varying degree, both during spring and autumn migration. The recorded patterns of drift were generally in agreement with ideas of adaptive drift predicting initial drift during the first stages of a migratory journey combined with an increasing amount of compensation as the birds approach their destinations. In a third study of wind drift and compensation I show that brent geese have the capacity to compensate for drift during a long flight over open ocean, despite the lack of access to stationary landmarks. Possible mechanisms for achieving compensation in such conditions are discussed. I analysed flight speeds in three studies and found that birds in general adjust airspeed by increasing airspeed in ... Doctoral or Postdoctoral Thesis Arctic brent geese Siberia Lund University Publications (LUP) Arctic |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Ecology geese waders terns Animal ecology Djurekologi wind tunnel radio telemetry satellite telemetry radar formation flight flight speed adjustment wind drift energy savings departure decisions bird migration wind |
spellingShingle |
Ecology geese waders terns Animal ecology Djurekologi wind tunnel radio telemetry satellite telemetry radar formation flight flight speed adjustment wind drift energy savings departure decisions bird migration wind Green, Martin Flight strategies in migrating birds: when and how to fly |
topic_facet |
Ecology geese waders terns Animal ecology Djurekologi wind tunnel radio telemetry satellite telemetry radar formation flight flight speed adjustment wind drift energy savings departure decisions bird migration wind |
description |
Wind has a profound influence on migrating birds since it inevitably will influence travel time and energy expenditure. In this thesis I investigate how migrating birds are affected by, and use winds. The studies cover the following main topics: i) the influence of wind on the decision to depart on a migratory flight, and possible energy savings by choosing to migrate in tailwinds, ii) the effect of wind on flight directions, i.e. wind drift and compensation, and iii) how flight speed (airspeed) is affected by different wind conditions. Brent geese were found to consistently select migration days with following winds during a multi-step, 5000 km migration from Western Europe to Siberia. Arctic waders passing over South Sweden were found to use strong following winds at high altitudes, with a potential for large savings in flight time and energy expenditure. A more detailed analysis revealed that the waders chose better than average days with respect to winds for their several thousand km long flights. By doing so they gained savings in time and energy exceeding 25% compared to a flight in still conditions. Compared to average conditions the savings were in the order of 5-10%. Arctic geese were found to drift partially with the wind during overland migration. Waders were also found to drift with the wind to a varying degree, both during spring and autumn migration. The recorded patterns of drift were generally in agreement with ideas of adaptive drift predicting initial drift during the first stages of a migratory journey combined with an increasing amount of compensation as the birds approach their destinations. In a third study of wind drift and compensation I show that brent geese have the capacity to compensate for drift during a long flight over open ocean, despite the lack of access to stationary landmarks. Possible mechanisms for achieving compensation in such conditions are discussed. I analysed flight speeds in three studies and found that birds in general adjust airspeed by increasing airspeed in ... |
format |
Doctoral or Postdoctoral Thesis |
author |
Green, Martin |
author_facet |
Green, Martin |
author_sort |
Green, Martin |
title |
Flight strategies in migrating birds: when and how to fly |
title_short |
Flight strategies in migrating birds: when and how to fly |
title_full |
Flight strategies in migrating birds: when and how to fly |
title_fullStr |
Flight strategies in migrating birds: when and how to fly |
title_full_unstemmed |
Flight strategies in migrating birds: when and how to fly |
title_sort |
flight strategies in migrating birds: when and how to fly |
publisher |
Martin Green, Dept. of Animal Ecology, Ecology Building, S-223 62 Lund, Sweden |
publishDate |
2003 |
url |
https://lup.lub.lu.se/record/465397 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic brent geese Siberia |
genre_facet |
Arctic brent geese Siberia |
op_relation |
https://lup.lub.lu.se/record/465397 urn:isbn:91-7105-183-X |
_version_ |
1766335517361700864 |