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Detours in bird migration

Alerstam, Thomas LU (2001) In Journal of Theoretical Biology 209(3). p.319-331
Abstract
Bird migration routes often follow detours where passages across ecological barriers are reduced in extent. This occurs in spite of the fact that long barrier crossings are within the birds' potential flight range capacity. Long-distance flights are associated with extra energy costs for transport of the heavy fuel loads required. This paper explores how important the fuel transport costs, estimated on the basis of flight mechanics, map be to explain detours for birds migrating by flapping flight, Maximum detours in relation to expanse of the barrier are predicted for cases where birds travel along the detour by numerous short flights and small fuel reserves, divide the detour into a limited number of flight steps, and where a reduced... (More)
Bird migration routes often follow detours where passages across ecological barriers are reduced in extent. This occurs in spite of the fact that long barrier crossings are within the birds' potential flight range capacity. Long-distance flights are associated with extra energy costs for transport of the heavy fuel loads required. This paper explores how important the fuel transport costs, estimated on the basis of flight mechanics, map be to explain detours for birds migrating by flapping flight, Maximum detours in relation to expanse of the barrier are predicted for cases where birds travel along the detour by numerous short flights and small fuel reserves, divide the detour into a limited number of flight steps, and where a reduced barrier passage is included in the detour. The principles for determining the optimum route, often involving a shortcut across part of the barrier, are derived. Furthermore, the effects of differences in fuel deposition rates and in transport costs for the profitability of detours are briefly considered. An evaluation of a number of observed and potential detours in relation to the general predictions of maximum detours, indicates that reduction of fuel transport costs may well be a factor of widespread importance for the evolution of detours in bird migration at wide ecological barriers. (C) 2001 Academic Press. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Theoretical Biology
volume
209
issue
3
pages
319 - 331
publisher
Academic Press
external identifiers
  • scopus:0035820197
ISSN
1095-8541
DOI
10.1006/jtbi.2001.2266
language
English
LU publication?
yes
id
410aa056-57af-463c-9af5-e0583a806751 (old id 145817)
alternative location
http://dx.doi.org/10.1006/jtbi.2001.2266
date added to LUP
2007-06-21 14:20:34
date last changed
2018-04-08 04:17:53
@article{410aa056-57af-463c-9af5-e0583a806751,
  abstract     = {Bird migration routes often follow detours where passages across ecological barriers are reduced in extent. This occurs in spite of the fact that long barrier crossings are within the birds' potential flight range capacity. Long-distance flights are associated with extra energy costs for transport of the heavy fuel loads required. This paper explores how important the fuel transport costs, estimated on the basis of flight mechanics, map be to explain detours for birds migrating by flapping flight, Maximum detours in relation to expanse of the barrier are predicted for cases where birds travel along the detour by numerous short flights and small fuel reserves, divide the detour into a limited number of flight steps, and where a reduced barrier passage is included in the detour. The principles for determining the optimum route, often involving a shortcut across part of the barrier, are derived. Furthermore, the effects of differences in fuel deposition rates and in transport costs for the profitability of detours are briefly considered. An evaluation of a number of observed and potential detours in relation to the general predictions of maximum detours, indicates that reduction of fuel transport costs may well be a factor of widespread importance for the evolution of detours in bird migration at wide ecological barriers. (C) 2001 Academic Press.},
  author       = {Alerstam, Thomas},
  issn         = {1095-8541},
  language     = {eng},
  number       = {3},
  pages        = {319--331},
  publisher    = {Academic Press},
  series       = {Journal of Theoretical Biology},
  title        = {Detours in bird migration},
  url          = {http://dx.doi.org/10.1006/jtbi.2001.2266},
  volume       = {209},
  year         = {2001},
}