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Environmental drivers of roosting body mass variation in boreal Great Tits Parus major

Broggi, Juli LU ; Koivula, Kari; Hohtola, Esa and Orell, Markku (2017) In Ibis 159(4). p.919-924
Abstract

Small wintering passerines adaptively modulate daily body mass acquisition as part of their energy management policy. However, whether birds optimize overnight mass loss or body mass at dawn remains poorly understood. We studied environmental correlates of individual variation in body mass at dusk, overnight mass loss and body mass at dawn in a wild population of Great Tits Parus major wintering in northern Fennoscandia. Body mass at dusk, overnight mass loss and body mass at dawn were independent of prevailing conditions despite extremely low night ambient temperatures. Body mass at dusk was higher in males than in females, and decreased throughout winter and when snowfall was higher in the previous month. Overnight mass loss increased... (More)

Small wintering passerines adaptively modulate daily body mass acquisition as part of their energy management policy. However, whether birds optimize overnight mass loss or body mass at dawn remains poorly understood. We studied environmental correlates of individual variation in body mass at dusk, overnight mass loss and body mass at dawn in a wild population of Great Tits Parus major wintering in northern Fennoscandia. Body mass at dusk, overnight mass loss and body mass at dawn were independent of prevailing conditions despite extremely low night ambient temperatures. Body mass at dusk was higher in males than in females, and decreased throughout winter and when snowfall was higher in the previous month. Overnight mass loss increased with precipitation during the previous week and tended to be higher in mid-winter, when nights were longest. However, birds reduced overnight mass loss with higher temperatures in the previous week and higher precipitation in the previous 2 weeks. Dawn body mass was strongly correlated with dusk body mass and overnight mass loss, and showed only mild associations with weather variables once dusk mass was accounted for. Body mass in roosting boreal Great Tits seems to be constrained by recent snowfall as the winter progresses, but otherwise appears to be mostly unaffected by previous and current temperatures, suggesting a regular use of facultative hypothermia.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
energy management, facultative hypothermia, night-time ecology, Parus major, winter conditions
in
Ibis
volume
159
issue
4
pages
6 pages
publisher
Wiley-Blackwell
external identifiers
  • scopus:85028968091
  • wos:000410649500018
ISSN
0019-1019
DOI
10.1111/ibi.12483
language
English
LU publication?
yes
id
73e0b342-344a-46fd-8aac-8f38e62e4f7c
date added to LUP
2017-09-26 08:47:02
date last changed
2018-01-16 13:26:31
@article{73e0b342-344a-46fd-8aac-8f38e62e4f7c,
  abstract     = {<p>Small wintering passerines adaptively modulate daily body mass acquisition as part of their energy management policy. However, whether birds optimize overnight mass loss or body mass at dawn remains poorly understood. We studied environmental correlates of individual variation in body mass at dusk, overnight mass loss and body mass at dawn in a wild population of Great Tits Parus major wintering in northern Fennoscandia. Body mass at dusk, overnight mass loss and body mass at dawn were independent of prevailing conditions despite extremely low night ambient temperatures. Body mass at dusk was higher in males than in females, and decreased throughout winter and when snowfall was higher in the previous month. Overnight mass loss increased with precipitation during the previous week and tended to be higher in mid-winter, when nights were longest. However, birds reduced overnight mass loss with higher temperatures in the previous week and higher precipitation in the previous 2 weeks. Dawn body mass was strongly correlated with dusk body mass and overnight mass loss, and showed only mild associations with weather variables once dusk mass was accounted for. Body mass in roosting boreal Great Tits seems to be constrained by recent snowfall as the winter progresses, but otherwise appears to be mostly unaffected by previous and current temperatures, suggesting a regular use of facultative hypothermia.</p>},
  author       = {Broggi, Juli and Koivula, Kari and Hohtola, Esa and Orell, Markku},
  issn         = {0019-1019},
  keyword      = {energy management,facultative hypothermia,night-time ecology,Parus major,winter conditions},
  language     = {eng},
  month        = {10},
  number       = {4},
  pages        = {919--924},
  publisher    = {Wiley-Blackwell},
  series       = {Ibis},
  title        = {Environmental drivers of roosting body mass variation in boreal Great Tits Parus major},
  url          = {http://dx.doi.org/10.1111/ibi.12483},
  volume       = {159},
  year         = {2017},
}