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Obligatory barrier crossing and adaptive fuel management in migratory birds: the case of Atlantic crossing in Northern Wheatears

Delingat, Julia; Bairlein, Franz and Hedenström, Anders LU (2008) In Behavioral Ecology and Sociobiology 62(7). p.1069-1078
Abstract
Behaviour on migration was often suggested to be selected for time-minimising strategies. Current optimality models predict that optimal fuel loads at departure from stopover sites should increase with increasing fuel deposition rates. We modified such models for the special case of the east Atlantic crossing of the Northern Wheatear (Oenanthe oenanthe). From optimality theory, we predict that optimal time-minimising behaviour in front of such a barrier should result in a positive correlation between fuel deposition rates and departure fuel loads only above a certain threshold, which is the minimum fuel load (f(min)) required for the barrier crossing. Using a robust range equation, we calculated the minimum fuel loads for different barrier... (More)
Behaviour on migration was often suggested to be selected for time-minimising strategies. Current optimality models predict that optimal fuel loads at departure from stopover sites should increase with increasing fuel deposition rates. We modified such models for the special case of the east Atlantic crossing of the Northern Wheatear (Oenanthe oenanthe). From optimality theory, we predict that optimal time-minimising behaviour in front of such a barrier should result in a positive correlation between fuel deposition rates and departure fuel loads only above a certain threshold, which is the minimum fuel load (f(min)) required for the barrier crossing. Using a robust range equation, we calculated the minimum fuel loads for different barrier crossings and predict that time-minimising wheatears should deposit a minimum of 24% fuel in relation to lean body mass (m (0)) for the sea crossing between Iceland and Scotland. Fuel loads of departing birds in autumn in Iceland reached this value only marginally but showed positive correlation between fuel deposition rate (FDR) and departure fuel load (DFL). Birds at Fair Isle (Scotland) in spring, which were heading towards Iceland or Greenland, were significantly heavier and even showed signs of overloading with fuel loads up to 50% of lean body mass. Departure decisions of Icelandic birds correlated significantly with favourable wind situations when assuming a migration direction towards Spain; however, the low departure fuel loads contradict a direct non-stop flight. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
flight costs, barrier crossing, optimal migration, Oenanthe oenanthe, fuel loads
in
Behavioral Ecology and Sociobiology
volume
62
issue
7
pages
1069 - 1078
publisher
Springer
external identifiers
  • wos:000255089900004
  • scopus:42449099546
ISSN
1432-0762
DOI
10.1007/s00265-007-0534-8
language
English
LU publication?
yes
id
ad6a4f37-bb5c-45e6-8f8d-0c9b1ce9a558 (old id 954599)
date added to LUP
2008-01-31 13:25:14
date last changed
2017-08-20 03:43:35
@article{ad6a4f37-bb5c-45e6-8f8d-0c9b1ce9a558,
  abstract     = {Behaviour on migration was often suggested to be selected for time-minimising strategies. Current optimality models predict that optimal fuel loads at departure from stopover sites should increase with increasing fuel deposition rates. We modified such models for the special case of the east Atlantic crossing of the Northern Wheatear (Oenanthe oenanthe). From optimality theory, we predict that optimal time-minimising behaviour in front of such a barrier should result in a positive correlation between fuel deposition rates and departure fuel loads only above a certain threshold, which is the minimum fuel load (f(min)) required for the barrier crossing. Using a robust range equation, we calculated the minimum fuel loads for different barrier crossings and predict that time-minimising wheatears should deposit a minimum of 24% fuel in relation to lean body mass (m (0)) for the sea crossing between Iceland and Scotland. Fuel loads of departing birds in autumn in Iceland reached this value only marginally but showed positive correlation between fuel deposition rate (FDR) and departure fuel load (DFL). Birds at Fair Isle (Scotland) in spring, which were heading towards Iceland or Greenland, were significantly heavier and even showed signs of overloading with fuel loads up to 50% of lean body mass. Departure decisions of Icelandic birds correlated significantly with favourable wind situations when assuming a migration direction towards Spain; however, the low departure fuel loads contradict a direct non-stop flight.},
  author       = {Delingat, Julia and Bairlein, Franz and Hedenström, Anders},
  issn         = {1432-0762},
  keyword      = {flight costs,barrier crossing,optimal migration,Oenanthe oenanthe,fuel loads},
  language     = {eng},
  number       = {7},
  pages        = {1069--1078},
  publisher    = {Springer},
  series       = {Behavioral Ecology and Sociobiology},
  title        = {Obligatory barrier crossing and adaptive fuel management in migratory birds: the case of Atlantic crossing in Northern Wheatears},
  url          = {http://dx.doi.org/10.1007/s00265-007-0534-8},
  volume       = {62},
  year         = {2008},
}