Timing is critical: Consequences of asynchronous migration for the performance and destination of a long-distance migrant

Acácio, Marta, Catry, Inês, Soriano-Redondo, Andrea, Silva, João Paulo, Atkinson, Philip W. and Franco, Aldina M. A. ORCID: https://orcid.org/0000-0001-6055-7378 (2022) Timing is critical: Consequences of asynchronous migration for the performance and destination of a long-distance migrant. Movement Ecology, 10. ISSN 2051-3933

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Background: Migration phenology is shifting for many long-distance migrants due to global climate change, however the timing and duration of migration may influence the environmental conditions individuals encounter, with potential fitness consequences. Species with asynchronous migrations, i.e., with variability in migration timing, provide an excellent opportunity to investigate how of the conditions individuals experience during migration can vary and affect the migratory performance, route, and destination of migrants. Methods: Here, we use GPS tracking and accelerometer data to examine if timing of autumn migration influences the migratory performance (duration, distance, route straightness, energy expenditure) and migration destinations of a long-distance, asynchronous, migrant, the white stork (Ciconia ciconia). We also compare the weather conditions (wind speed, wind direction, and boundary layer height) encountered on migration and examine the influence of wind direction on storks’ flight directions. Results: From 2016 to 2020, we tracked 172 white storks and obtained 75 complete migrations from the breeding grounds in Europe to the sub-Saharan wintering areas. Autumn migration season spanned over a 3-month period (July–October) and arrival destinations covered a broad area of the Sahel, 2450 km apart, from Senegal to Niger. We found that timing of migration influenced both the performance and conditions individuals experienced: later storks spent fewer days on migration, adopted shorter and more direct routes in the Sahara Desert and consumed more energy when flying, as they were exposed to less supportive weather conditions. In the Desert, storks’ flight directions were significantly influenced by wind direction, with later individuals facing stronger easterly winds (i.e., winds blowing to the west), hence being more likely to end their migration in western areas of the Sahel region. Contrastingly, early storks encountered more supportive weather conditions, spent less energy on migration and were exposed to westerly winds, thus being more likely to end migration in eastern Sahel. Conclusions: Our results show that the timing of migration influences the environmental conditions individuals face, the energetic costs of migration, and the wintering destinations, where birds may be exposed to different environmental conditions and distinct threats. These findings highlight that on-going changes in migration phenology, due to environmental change, may have critical fitness consequences for long-distance soaring migrants.

Item Type: Article
Additional Information: Funding: This research was funded by Natural Environment Research Council (NERC) and Engineering and Physical Sciences Research Council (EPSRC), via the NEXUSS CDT Training in the Smart and Autonomous Observation of the Environment (NE/N012070/1). Funding for this project was also provided by NERC via the EnvEast DTP (NE/ K006312), Norwich Research Park Translational Fund, University of East Anglia Innovation Funds and Earth and Life Systems Alliance funds. This research also benefited from FEDER Funds through the Operational Competitiveness Factors Program—COMPETE and by national funds through Fundação para a Ciência e Tecnologia (FCT) within the scope of the project POCI-01-0145-FEDER-028176. JPS was funded by the FCT project SFRH/BPD/111084/2015.
Uncontrolled Keywords: bird migration,energy expenditure,gps tracking,migration phenology,odba,timing of migration,weather,white storks,ecology, evolution, behavior and systematics ,/dk/atira/pure/subjectarea/asjc/1100/1105
Faculty \ School: Faculty of Science > School of Environmental Sciences
University of East Anglia Research Groups/Centres > Theme - ClimateUEA
UEA Research Groups: Faculty of Science > Research Centres > Centre for Ecology, Evolution and Conservation
Faculty of Science > Research Groups > Environmental Biology
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Depositing User: LivePure Connector
Date Deposited: 24 Jun 2022 14:30
Last Modified: 08 Mar 2024 20:31
URI: https://ueaeprints.uea.ac.uk/id/eprint/85778
DOI: 10.1186/s40462-022-00328-3


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