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Rank-dependent hoarding effort in willow tits (Parus montanus): a test of theoretical predictions

Brodin, Anders LU and Lundborg, Ken LU (2003) In Behavioral Ecology and Sociobiology 54(6). p.587-592
Abstract
Many birds and mammals store energy as hoarded food supplies. A supply of stored food is beneficial during periods when food is scarce, but building up and managing such a supply also entails costs. The optimal number of caches will be reached when the net benefit is at its maximum. If dominants can steal more stored food from subordinates than the other way around, the optimum will differ between these categories. A previous theoretical model of hoarding in groups with dominant and subordinate members produced three testable predictions: (1) hoarders should store more food as anticipated future conditions get worse; (2) subordinate flock members should store more food than dominants; and (3) dominants should increase hoarding relatively... (More)
Many birds and mammals store energy as hoarded food supplies. A supply of stored food is beneficial during periods when food is scarce, but building up and managing such a supply also entails costs. The optimal number of caches will be reached when the net benefit is at its maximum. If dominants can steal more stored food from subordinates than the other way around, the optimum will differ between these categories. A previous theoretical model of hoarding in groups with dominant and subordinate members produced three testable predictions: (1) hoarders should store more food as anticipated future conditions get worse; (2) subordinate flock members should store more food than dominants; and (3) dominants should increase hoarding relatively more than subordinates as conditions get worse. Here we present a field experiment on willow tits (Parus montanus) designed to test these predictions. We found support for all three. Hoarding increased as conditions got worse, subordinates stored at a higher rate than dominants, and dominants increased their hoarding effort relatively more than subordinates as conditions worsened. These results support the incorporation of information on dominance and food availability into models predicting food storage behaviour. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Behavioral Ecology and Sociobiology
volume
54
issue
6
pages
587 - 592
publisher
Springer
external identifiers
  • wos:000185601200009
  • scopus:0142123220
ISSN
1432-0762
DOI
10.1007/s00265-003-0661-9
language
English
LU publication?
yes
id
293309db-edb6-47be-81c9-21625afc712c (old id 135442)
date added to LUP
2007-07-03 11:16:57
date last changed
2017-01-01 07:25:46
@article{293309db-edb6-47be-81c9-21625afc712c,
  abstract     = {Many birds and mammals store energy as hoarded food supplies. A supply of stored food is beneficial during periods when food is scarce, but building up and managing such a supply also entails costs. The optimal number of caches will be reached when the net benefit is at its maximum. If dominants can steal more stored food from subordinates than the other way around, the optimum will differ between these categories. A previous theoretical model of hoarding in groups with dominant and subordinate members produced three testable predictions: (1) hoarders should store more food as anticipated future conditions get worse; (2) subordinate flock members should store more food than dominants; and (3) dominants should increase hoarding relatively more than subordinates as conditions get worse. Here we present a field experiment on willow tits (Parus montanus) designed to test these predictions. We found support for all three. Hoarding increased as conditions got worse, subordinates stored at a higher rate than dominants, and dominants increased their hoarding effort relatively more than subordinates as conditions worsened. These results support the incorporation of information on dominance and food availability into models predicting food storage behaviour.},
  author       = {Brodin, Anders and Lundborg, Ken},
  issn         = {1432-0762},
  language     = {eng},
  number       = {6},
  pages        = {587--592},
  publisher    = {Springer},
  series       = {Behavioral Ecology and Sociobiology},
  title        = {Rank-dependent hoarding effort in willow tits (Parus montanus): a test of theoretical predictions},
  url          = {http://dx.doi.org/10.1007/s00265-003-0661-9},
  volume       = {54},
  year         = {2003},
}