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Converging migration routes of Eurasian hobbies Falco subbuteo crossing the African equatorial rain forest.

Strandberg, Roine LU ; Klaassen, Raymond LU ; Hake, Mikael; Olofsson, Patrik and Alerstam, Thomas LU (2009) In Royal Society of London. Proceedings B. Biological Sciences 276(1657). p.727-733
Abstract
Autumn migration of adult Eurasian hobbies Falco subbuteo from Europe to southern Africa was recorded by satellite telemetry and observed routes were compared with randomly simulated routes. Two non-random features of observed routes were revealed: (i) shifts to more westerly longitudes than straight paths to destinations and (ii) strong route convergence towards a restricted area close to the equator (1 degrees S, 15 degrees E). The birds migrated south or southwest to approximately 10 degrees N, where they changed to south-easterly courses. The maximal spread between routes at 10 degrees N (2134km) rapidly decreased to a minimum (67km) close to the equator. We found a striking relationship between the route convergence and the... (More)
Autumn migration of adult Eurasian hobbies Falco subbuteo from Europe to southern Africa was recorded by satellite telemetry and observed routes were compared with randomly simulated routes. Two non-random features of observed routes were revealed: (i) shifts to more westerly longitudes than straight paths to destinations and (ii) strong route convergence towards a restricted area close to the equator (1 degrees S, 15 degrees E). The birds migrated south or southwest to approximately 10 degrees N, where they changed to south-easterly courses. The maximal spread between routes at 10 degrees N (2134km) rapidly decreased to a minimum (67km) close to the equator. We found a striking relationship between the route convergence and the distribution of continuous rainforest, suggesting that hobbies minimize flight distance across the forest, concentrating in a corridor where habitat may be more suitable for travelling and foraging. With rainforest forming a possible ecological barrier, many migrants may cross the equator either at 15 degrees E, similar to the hobbies, or at 30-40 degrees E, east of the rainforest where large-scale migration is well documented. Much remains to be understood about the role of the rainforest for the evolution and future of the trans-equatorial Palaearctic-African bird migration systems. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
bird migration, route convergence, equatorial rainforest, ecological barrier, Eurasian hobby Falco subbuteo
in
Royal Society of London. Proceedings B. Biological Sciences
volume
276
issue
1657
pages
727 - 733
publisher
Royal Society
external identifiers
  • wos:000262419000016
  • scopus:58249114911
ISSN
1471-2954
DOI
10.1098/rspb.2008.1202
language
English
LU publication?
yes
id
ec3f8dc8-d1e5-4c08-acce-01990209bd9f (old id 1271806)
date added to LUP
2009-02-11 12:47:23
date last changed
2017-10-22 03:37:15
@article{ec3f8dc8-d1e5-4c08-acce-01990209bd9f,
  abstract     = {Autumn migration of adult Eurasian hobbies Falco subbuteo from Europe to southern Africa was recorded by satellite telemetry and observed routes were compared with randomly simulated routes. Two non-random features of observed routes were revealed: (i) shifts to more westerly longitudes than straight paths to destinations and (ii) strong route convergence towards a restricted area close to the equator (1 degrees S, 15 degrees E). The birds migrated south or southwest to approximately 10 degrees N, where they changed to south-easterly courses. The maximal spread between routes at 10 degrees N (2134km) rapidly decreased to a minimum (67km) close to the equator. We found a striking relationship between the route convergence and the distribution of continuous rainforest, suggesting that hobbies minimize flight distance across the forest, concentrating in a corridor where habitat may be more suitable for travelling and foraging. With rainforest forming a possible ecological barrier, many migrants may cross the equator either at 15 degrees E, similar to the hobbies, or at 30-40 degrees E, east of the rainforest where large-scale migration is well documented. Much remains to be understood about the role of the rainforest for the evolution and future of the trans-equatorial Palaearctic-African bird migration systems.},
  author       = {Strandberg, Roine and Klaassen, Raymond and Hake, Mikael and Olofsson, Patrik and Alerstam, Thomas},
  issn         = {1471-2954},
  keyword      = {bird migration,route convergence,equatorial rainforest,ecological barrier,Eurasian hobby Falco subbuteo},
  language     = {eng},
  number       = {1657},
  pages        = {727--733},
  publisher    = {Royal Society},
  series       = {Royal Society of London. Proceedings B. Biological Sciences},
  title        = {Converging migration routes of Eurasian hobbies Falco subbuteo crossing the African equatorial rain forest.},
  url          = {http://dx.doi.org/10.1098/rspb.2008.1202},
  volume       = {276},
  year         = {2009},
}