Migratory behaviour and ecology of a trans-Saharan migrant raptor, the osprey Pandion haliaetus
The seasonal migration of birds is one of the great phenomena of the natural world and satellite tracking provides a valuable means to analyse the behavioural and environmental factors that influence it. In this study satellite telemetry was used to track ospreys Pandion haliaetus during migration b...
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ftleicesterunfig:oai:figshare.com:article/10202285 2023-05-15T18:50:56+02:00 Migratory behaviour and ecology of a trans-Saharan migrant raptor, the osprey Pandion haliaetus Timothy Robert Mackrill 2017-05-23T00:00:00Z https://figshare.com/articles/thesis/Migratory_behaviour_and_ecology_of_a_trans-Saharan_migrant_raptor_the_osprey_Pandion_haliaetus/10202285 unknown 2381/39846 https://figshare.com/articles/thesis/Migratory_behaviour_and_ecology_of_a_trans-Saharan_migrant_raptor_the_osprey_Pandion_haliaetus/10202285 All Rights Reserved Uncategorized IR content Text Thesis 2017 ftleicesterunfig 2021-11-11T19:35:25Z The seasonal migration of birds is one of the great phenomena of the natural world and satellite tracking provides a valuable means to analyse the behavioural and environmental factors that influence it. In this study satellite telemetry was used to track ospreys Pandion haliaetus during migration between the United Kingdom and West Africa. Autumn migrations were faster than those in spring, with more favourable meteorological conditions resulting in ospreys requiring fewer travelling days to reach their destination. They also incorporated time-minimisation techniques during southward journeys, indicating that selection-pressure influences migration speed in autumn as well as during spring migrations. The reclamation of winter territories is likely the key behavioural driver during autumn, particularly as later-departing individuals migrated faster. High resolution GSM-GPS transmitters provided new insights into the ability of ospreys to adapt flight method to environmental conditions, with tagged individuals exploiting thermal updrafts when available, but swapping to energy-demanding flapping flight when necessary. Very long ocean crossings, particularly across the Bay of Biscay, were regularly undertaken in autumn, when tailwinds aided progress. These flights were predominantly undertaken by flapping, but ospreys sometimes exploited weak thermals and elements of the wind to achieve soaring-gliding flight over the sea, the first time such behaviour has been documented. Individuals also regulated both flapping and gliding airspeed in response to changing wind conditions. Juvenile ospreys showed clear individual variation in the timing and speed of migration. Migration routes during the first migration were profoundly influenced by weather conditions, with wind drift resulting in very long flights across the ocean. It was also notable that ospreys with the longest post-fledging phase migrated fastest. Juveniles generally exhibited energy-minimisation techniques during migration, indicating that they were less ... Thesis osprey Pandion haliaetus University of Leicester: Figshare |
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Uncategorized IR content Timothy Robert Mackrill Migratory behaviour and ecology of a trans-Saharan migrant raptor, the osprey Pandion haliaetus |
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Uncategorized IR content |
description |
The seasonal migration of birds is one of the great phenomena of the natural world and satellite tracking provides a valuable means to analyse the behavioural and environmental factors that influence it. In this study satellite telemetry was used to track ospreys Pandion haliaetus during migration between the United Kingdom and West Africa. Autumn migrations were faster than those in spring, with more favourable meteorological conditions resulting in ospreys requiring fewer travelling days to reach their destination. They also incorporated time-minimisation techniques during southward journeys, indicating that selection-pressure influences migration speed in autumn as well as during spring migrations. The reclamation of winter territories is likely the key behavioural driver during autumn, particularly as later-departing individuals migrated faster. High resolution GSM-GPS transmitters provided new insights into the ability of ospreys to adapt flight method to environmental conditions, with tagged individuals exploiting thermal updrafts when available, but swapping to energy-demanding flapping flight when necessary. Very long ocean crossings, particularly across the Bay of Biscay, were regularly undertaken in autumn, when tailwinds aided progress. These flights were predominantly undertaken by flapping, but ospreys sometimes exploited weak thermals and elements of the wind to achieve soaring-gliding flight over the sea, the first time such behaviour has been documented. Individuals also regulated both flapping and gliding airspeed in response to changing wind conditions. Juvenile ospreys showed clear individual variation in the timing and speed of migration. Migration routes during the first migration were profoundly influenced by weather conditions, with wind drift resulting in very long flights across the ocean. It was also notable that ospreys with the longest post-fledging phase migrated fastest. Juveniles generally exhibited energy-minimisation techniques during migration, indicating that they were less ... |
format |
Thesis |
author |
Timothy Robert Mackrill |
author_facet |
Timothy Robert Mackrill |
author_sort |
Timothy Robert Mackrill |
title |
Migratory behaviour and ecology of a trans-Saharan migrant raptor, the osprey Pandion haliaetus |
title_short |
Migratory behaviour and ecology of a trans-Saharan migrant raptor, the osprey Pandion haliaetus |
title_full |
Migratory behaviour and ecology of a trans-Saharan migrant raptor, the osprey Pandion haliaetus |
title_fullStr |
Migratory behaviour and ecology of a trans-Saharan migrant raptor, the osprey Pandion haliaetus |
title_full_unstemmed |
Migratory behaviour and ecology of a trans-Saharan migrant raptor, the osprey Pandion haliaetus |
title_sort |
migratory behaviour and ecology of a trans-saharan migrant raptor, the osprey pandion haliaetus |
publishDate |
2017 |
url |
https://figshare.com/articles/thesis/Migratory_behaviour_and_ecology_of_a_trans-Saharan_migrant_raptor_the_osprey_Pandion_haliaetus/10202285 |
genre |
osprey Pandion haliaetus |
genre_facet |
osprey Pandion haliaetus |
op_relation |
2381/39846 https://figshare.com/articles/thesis/Migratory_behaviour_and_ecology_of_a_trans-Saharan_migrant_raptor_the_osprey_Pandion_haliaetus/10202285 |
op_rights |
All Rights Reserved |
_version_ |
1766244711885963264 |