Advanced

Optimal departure decisions of songbirds from an experimental stopover site and the significance of weather

Dänhardt, Juliana LU and Lindström, Åke LU (2001) In Animal Behaviour 62(2). p.235-243
Abstract
Recent models have worked with the assumption that birds try to minimize either time, energy or predation risk during migration, or some combination of these. The few empirical studies available have suggested that time minimization may be the most common strategy. One way of distinguishing between strategies is to study the departure decisions of migrating birds. We supplied migrating European robins, Erithacus rubecula, with food ad libitum in the field and monitored their changes in body mass prior to departure. The overall mass gain rate (k(tot), the ratio of daily mass increase to lean mass) of 10 birds using the feeding station was on average 0.05 (range 0.03-0.09). Departure fuel loads (f(dep), the ratio of fuel mass to lean mass)... (More)
Recent models have worked with the assumption that birds try to minimize either time, energy or predation risk during migration, or some combination of these. The few empirical studies available have suggested that time minimization may be the most common strategy. One way of distinguishing between strategies is to study the departure decisions of migrating birds. We supplied migrating European robins, Erithacus rubecula, with food ad libitum in the field and monitored their changes in body mass prior to departure. The overall mass gain rate (k(tot), the ratio of daily mass increase to lean mass) of 10 birds using the feeding station was on average 0.05 (range 0.03-0.09). Departure fuel loads (f(dep), the ratio of fuel mass to lean mass) were on average 0.53 (range 0.35-0.66). There was no significant correlation between f(dep) and k(tot), which indicates a strategy of minimizing the energy cost of transport, rather than minimizing time but other aspects of the fuel deposition pattern suggest that time minimization may also be important. Whereas the behaviour of the robins was difficult to interpret in the light of optimal migration strategies, the importance of weather was striking. The robins selected the best weather conditions (tail wind, high air pressure and no precipitation) within the likely period of departure. (C) 2001 The Association for the Study of Animal Behaviour. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Animal Behaviour
volume
62
issue
2
pages
235 - 243
publisher
Elsevier Ltd
external identifiers
  • scopus:0034870499
ISSN
1095-8282
DOI
10.1006/anbe.2001.1749
language
English
LU publication?
yes
id
a35ff77a-fa0a-4609-bd58-baa1a45fe522 (old id 145727)
date added to LUP
2007-06-26 07:12:43
date last changed
2018-05-29 09:53:50
@article{a35ff77a-fa0a-4609-bd58-baa1a45fe522,
  abstract     = {Recent models have worked with the assumption that birds try to minimize either time, energy or predation risk during migration, or some combination of these. The few empirical studies available have suggested that time minimization may be the most common strategy. One way of distinguishing between strategies is to study the departure decisions of migrating birds. We supplied migrating European robins, Erithacus rubecula, with food ad libitum in the field and monitored their changes in body mass prior to departure. The overall mass gain rate (k(tot), the ratio of daily mass increase to lean mass) of 10 birds using the feeding station was on average 0.05 (range 0.03-0.09). Departure fuel loads (f(dep), the ratio of fuel mass to lean mass) were on average 0.53 (range 0.35-0.66). There was no significant correlation between f(dep) and k(tot), which indicates a strategy of minimizing the energy cost of transport, rather than minimizing time but other aspects of the fuel deposition pattern suggest that time minimization may also be important. Whereas the behaviour of the robins was difficult to interpret in the light of optimal migration strategies, the importance of weather was striking. The robins selected the best weather conditions (tail wind, high air pressure and no precipitation) within the likely period of departure. (C) 2001 The Association for the Study of Animal Behaviour.},
  author       = {Dänhardt, Juliana and Lindström, Åke},
  issn         = {1095-8282},
  language     = {eng},
  number       = {2},
  pages        = {235--243},
  publisher    = {Elsevier Ltd},
  series       = {Animal Behaviour},
  title        = {Optimal departure decisions of songbirds from an experimental stopover site and the significance of weather},
  url          = {http://dx.doi.org/10.1006/anbe.2001.1749},
  volume       = {62},
  year         = {2001},
}