Negotiating an ecological barrier : Crossing the Sahara in relation to winds by common swifts
Åkesson, Susanne LU ; Bianco, Giuseppe LU
and Hedenström, Anders
LU
(2016)
In Philosophical Transactions of the Royal Society B: Biological Sciences
371(1704).
- Abstract
The Sahara Desert is one of the largest land-based barriers on the Earth, crossed twice each year by billions of birds on migration. Here we investigate how common swifts migrating between breeding sites in Sweden and wintering areas in sub-Saharan Africa perform the desert crossing with respect to route choice, winds, timing and speed of migration by analysing 72 geolocator tracks recording migration. The swifts crosswestern Sahara on a broad front in autumn, while in spring they seem to use three alternative routes across the Sahara, awestern, a central and an eastern route across the Arabian Peninsula, with most birds using the western route. The swifts show slower migration and travel speeds, and make longer detours with more stops... (More)
The Sahara Desert is one of the largest land-based barriers on the Earth, crossed twice each year by billions of birds on migration. Here we investigate how common swifts migrating between breeding sites in Sweden and wintering areas in sub-Saharan Africa perform the desert crossing with respect to route choice, winds, timing and speed of migration by analysing 72 geolocator tracks recording migration. The swifts crosswestern Sahara on a broad front in autumn, while in spring they seem to use three alternative routes across the Sahara, awestern, a central and an eastern route across the Arabian Peninsula, with most birds using the western route. The swifts show slower migration and travel speeds, and make longer detours with more stops in autumn compared with spring. In spring, the stopover period in West Africa coincided with mostly favourable winds, but birds remained in the area, suggesting fuelling. The western route provided more tailwind assistance compared with the central route for our tracked swifts in spring, but not in autumn. The ultimate explanation for the evolution of a preferred western route is presumably a combination of matching rich foraging conditions (swarming insects) and favourable winds enabling fast spring migration.
(Less)
- author
- Åkesson, Susanne
LU
; Bianco, Giuseppe
LU
and Hedenström, Anders
LU
- organization
- publishing date
- 2016-09-26
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Barrier crossing, Common swift, Migration, Migration routes, The sahara, Wind assistance
- in
- Philosophical Transactions of the Royal Society B: Biological Sciences
- volume
- 371
- issue
- 1704
- article number
- 20150393
- publisher
- Royal Society Publishing
- external identifiers
-
- scopus:84982206033
- pmid:27528783
- wos:000383111900016
- ISSN
- 0962-8436
- DOI
- 10.1098/rstb.2015.0393
- language
- English
- LU publication?
- yes
- id
- a1a098fd-572a-49a3-a9b4-4a61fa9e06db
- date added to LUP
- 2016-10-31 14:03:31
- date last changed
- 2024-05-31 15:55:04
@article{a1a098fd-572a-49a3-a9b4-4a61fa9e06db,
abstract = {{<p>The Sahara Desert is one of the largest land-based barriers on the Earth, crossed twice each year by billions of birds on migration. Here we investigate how common swifts migrating between breeding sites in Sweden and wintering areas in sub-Saharan Africa perform the desert crossing with respect to route choice, winds, timing and speed of migration by analysing 72 geolocator tracks recording migration. The swifts crosswestern Sahara on a broad front in autumn, while in spring they seem to use three alternative routes across the Sahara, awestern, a central and an eastern route across the Arabian Peninsula, with most birds using the western route. The swifts show slower migration and travel speeds, and make longer detours with more stops in autumn compared with spring. In spring, the stopover period in West Africa coincided with mostly favourable winds, but birds remained in the area, suggesting fuelling. The western route provided more tailwind assistance compared with the central route for our tracked swifts in spring, but not in autumn. The ultimate explanation for the evolution of a preferred western route is presumably a combination of matching rich foraging conditions (swarming insects) and favourable winds enabling fast spring migration.</p>}},
author = {{Åkesson, Susanne and Bianco, Giuseppe and Hedenström, Anders}},
issn = {{0962-8436}},
keywords = {{Barrier crossing; Common swift; Migration; Migration routes; The sahara; Wind assistance}},
language = {{eng}},
month = {{09}},
number = {{1704}},
publisher = {{Royal Society Publishing}},
series = {{Philosophical Transactions of the Royal Society B: Biological Sciences}},
title = {{Negotiating an ecological barrier : Crossing the Sahara in relation to winds by common swifts}},
url = {{http://dx.doi.org/10.1098/rstb.2015.0393}},
doi = {{10.1098/rstb.2015.0393}},
volume = {{371}},
year = {{2016}},
}