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Energetic constraints and ultimate decisions during egglaying in the blue tit

Nilsson, Jan-Åke LU and Svensson, Erik LU (1993) In Ecology 74(1). p.244-251
Abstract
In a population of Blue Tits, Parus caeruleus, we performed two different food provisioning experiments; one starting before clutch initiaition and one starting when the first eggs were laid. We assessed the effect of these feeding experiments on four fitness—related factors, viz., laying date, clutch size, egg mass, and onset of incubation. Given that breeding birds are food and energy constrained, extra food during the breeding season should be invested in the fitness—related factor(s) that is most important for maximization of overall fitness. In the first feeding experiment, when breeding pairs had access to extra food both before and during egg—laying, the female converted this extra energy into earlier laying dates. When food was... (More)
In a population of Blue Tits, Parus caeruleus, we performed two different food provisioning experiments; one starting before clutch initiaition and one starting when the first eggs were laid. We assessed the effect of these feeding experiments on four fitness—related factors, viz., laying date, clutch size, egg mass, and onset of incubation. Given that breeding birds are food and energy constrained, extra food during the breeding season should be invested in the fitness—related factor(s) that is most important for maximization of overall fitness. In the first feeding experiment, when breeding pairs had access to extra food both before and during egg—laying, the female converted this extra energy into earlier laying dates. When food was provided after clutch initiation only, the above preferred option was no longer available. In this situation, females used the extra energy to start incubating earlier in the laying sequence, with no influence on the other factors studied. Thus, both experiments resulted in surplus energy being used to increase the quality of the offspring instead of their number. In both cases the quality was connected with time savings leading to earlier hatching dates. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Ecology
volume
74
issue
1
pages
244 - 251
publisher
Ecological Society of America
external identifiers
  • scopus:0027526724
ISSN
0012-9658
DOI
10.2307/1939519
language
English
LU publication?
yes
id
1d4feefc-f0c4-4059-9848-febf268505f6
date added to LUP
2019-06-10 09:01:22
date last changed
2019-08-16 14:24:37
@article{1d4feefc-f0c4-4059-9848-febf268505f6,
  abstract     = {In a population of Blue Tits, Parus caeruleus, we performed two different food provisioning experiments; one starting before clutch initiaition and one starting when the first eggs were laid. We assessed the effect of these feeding experiments on four fitness—related factors, viz., laying date, clutch size, egg mass, and onset of incubation. Given that breeding birds are food and energy constrained, extra food during the breeding season should be invested in the fitness—related factor(s) that is most important for maximization of overall fitness. In the first feeding experiment, when breeding pairs had access to extra food both before and during egg—laying, the female converted this extra energy into earlier laying dates. When food was provided after clutch initiation only, the above preferred option was no longer available. In this situation, females used the extra energy to start incubating earlier in the laying sequence, with no influence on the other factors studied. Thus, both experiments resulted in surplus energy being used to increase the quality of the offspring instead of their number. In both cases the quality was connected with time savings leading to earlier hatching dates.},
  author       = {Nilsson, Jan-Åke and Svensson, Erik},
  issn         = {0012-9658},
  language     = {eng},
  number       = {1},
  pages        = {244--251},
  publisher    = {Ecological Society of America},
  series       = {Ecology},
  title        = {Energetic constraints and ultimate decisions during egglaying in the blue tit},
  url          = {http://dx.doi.org/10.2307/1939519},
  volume       = {74},
  year         = {1993},
}