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Daily foraging routines and feeding effort of a small bird feeding on a predictable resource

Olsson, Ola LU ; Wiktander, Ulf and Nilsson, Sven LU (2000) In Royal Society of London. Proceedings B. Biological Sciences 267(1451). p.1457-1461
Abstract
According to theory, a small diurnal bird living in a predictable environment should have the highest feeding effort as late as possible in the day in order to minimize the time it carries large and costly reserves. The feeding effort should also decline with increasing food availability. We tested both these ideas with the lesser spotted woodpecker (Dendrocopos minor). For most of the year, this bird feeds on wood-living insects in dead tree branches. This food supply is likely to be highly predictable on a daily scale. Our results corroborated the theory. We found that the proportion of time spent actively feeding was lower in the mornings (before noon) than in the afternoons. We also found that woodpeckers spent less time feeding the... (More)
According to theory, a small diurnal bird living in a predictable environment should have the highest feeding effort as late as possible in the day in order to minimize the time it carries large and costly reserves. The feeding effort should also decline with increasing food availability. We tested both these ideas with the lesser spotted woodpecker (Dendrocopos minor). For most of the year, this bird feeds on wood-living insects in dead tree branches. This food supply is likely to be highly predictable on a daily scale. Our results corroborated the theory. We found that the proportion of time spent actively feeding was lower in the mornings (before noon) than in the afternoons. We also found that woodpeckers spent less time feeding the higher their food availability. However, for a given food availability they spent more time feeding in the afternoons. This supports the idea that feeding is less and other activities are more valuable in the mornings given a predictable food resource. This is the first demonstration of daily routines in small birds concordant with a predictable environment. In spring, males but not females reduced their feeding time. This difference between the sexes may be related to their sex-specific reproductive effort. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Royal Society of London. Proceedings B. Biological Sciences
volume
267
issue
1451
pages
1457 - 1461
publisher
Royal Society
external identifiers
  • scopus:0034702472
ISSN
1471-2954
DOI
10.1098/rspb.2000.1164
language
English
LU publication?
yes
id
e3d34027-9345-4ee1-aefe-a18dc77c680f (old id 145966)
date added to LUP
2007-06-26 11:03:14
date last changed
2017-06-18 03:45:14
@article{e3d34027-9345-4ee1-aefe-a18dc77c680f,
  abstract     = {According to theory, a small diurnal bird living in a predictable environment should have the highest feeding effort as late as possible in the day in order to minimize the time it carries large and costly reserves. The feeding effort should also decline with increasing food availability. We tested both these ideas with the lesser spotted woodpecker (Dendrocopos minor). For most of the year, this bird feeds on wood-living insects in dead tree branches. This food supply is likely to be highly predictable on a daily scale. Our results corroborated the theory. We found that the proportion of time spent actively feeding was lower in the mornings (before noon) than in the afternoons. We also found that woodpeckers spent less time feeding the higher their food availability. However, for a given food availability they spent more time feeding in the afternoons. This supports the idea that feeding is less and other activities are more valuable in the mornings given a predictable food resource. This is the first demonstration of daily routines in small birds concordant with a predictable environment. In spring, males but not females reduced their feeding time. This difference between the sexes may be related to their sex-specific reproductive effort.},
  author       = {Olsson, Ola and Wiktander, Ulf and Nilsson, Sven},
  issn         = {1471-2954},
  language     = {eng},
  number       = {1451},
  pages        = {1457--1461},
  publisher    = {Royal Society},
  series       = {Royal Society of London. Proceedings B. Biological Sciences},
  title        = {Daily foraging routines and feeding effort of a small bird feeding on a predictable resource},
  url          = {http://dx.doi.org/10.1098/rspb.2000.1164},
  volume       = {267},
  year         = {2000},
}