Cool birds: first evidence of energy-saving nocturnal torpor in free-living common swifts Apus apus resting in their nests
Daily torpor is a means of saving energy by controlled lowering of the metabolic rate (MR) during resting, usually coupled with a decrease in body temperature. We studied nocturnal daily torpor under natural conditions in free-living common swifts Apus apus resting in their nests as a family using t...
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ftpubmed:oai:pubmedcentral.nih.gov:9006018 2023-05-15T14:17:13+02:00 Cool birds: first evidence of energy-saving nocturnal torpor in free-living common swifts Apus apus resting in their nests Wellbrock, Arndt H. J. Eckhardt, Luca R. H. Kelsey, Natalie A. Heldmaier, Gerhard Rozman, Jan Witte, Klaudia 2022-04-13 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9006018/ http://www.ncbi.nlm.nih.gov/pubmed/35414223 https://doi.org/10.1098/rsbl.2021.0675 en eng The Royal Society http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9006018/ http://www.ncbi.nlm.nih.gov/pubmed/35414223 http://dx.doi.org/10.1098/rsbl.2021.0675 © 2022 The Authors. https://creativecommons.org/licenses/by/4.0/Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, provided the original author and source are credited. CC-BY Biol Lett Physiology Text 2022 ftpubmed https://doi.org/10.1098/rsbl.2021.0675 2022-05-15T00:28:09Z Daily torpor is a means of saving energy by controlled lowering of the metabolic rate (MR) during resting, usually coupled with a decrease in body temperature. We studied nocturnal daily torpor under natural conditions in free-living common swifts Apus apus resting in their nests as a family using two non-invasive approaches. First, we monitored nest temperature (T(nest)) in up to 50 occupied nests per breeding season in 2010–2015. Drops in T(nest) were the first indication of torpor. Among 16 673 observations, we detected 423 events of substantial drops in T(nest) of on average 8.6°C. Second, we measured MR of the families inside nest-boxes prepared for calorimetric measurements during cold periods in the breeding seasons of 2017 and 2018. We measured oxygen consumption and carbon dioxide production using a mobile indirect respirometer and calculated the percentage reduction in MR. During six torpor events observed, MR was gradually reduced by on average 56% from the reference value followed by a decrease in T(nest) of on average 7.6°C. By contrast, MR only decreased by about 33% on nights without torpor. Our field data gave an indication of daily torpor, which is used as a strategy for energy saving in free-living common swifts. Text Apus apus PubMed Central (PMC) Biology Letters 18 4 |
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Physiology |
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Physiology Wellbrock, Arndt H. J. Eckhardt, Luca R. H. Kelsey, Natalie A. Heldmaier, Gerhard Rozman, Jan Witte, Klaudia Cool birds: first evidence of energy-saving nocturnal torpor in free-living common swifts Apus apus resting in their nests |
topic_facet |
Physiology |
description |
Daily torpor is a means of saving energy by controlled lowering of the metabolic rate (MR) during resting, usually coupled with a decrease in body temperature. We studied nocturnal daily torpor under natural conditions in free-living common swifts Apus apus resting in their nests as a family using two non-invasive approaches. First, we monitored nest temperature (T(nest)) in up to 50 occupied nests per breeding season in 2010–2015. Drops in T(nest) were the first indication of torpor. Among 16 673 observations, we detected 423 events of substantial drops in T(nest) of on average 8.6°C. Second, we measured MR of the families inside nest-boxes prepared for calorimetric measurements during cold periods in the breeding seasons of 2017 and 2018. We measured oxygen consumption and carbon dioxide production using a mobile indirect respirometer and calculated the percentage reduction in MR. During six torpor events observed, MR was gradually reduced by on average 56% from the reference value followed by a decrease in T(nest) of on average 7.6°C. By contrast, MR only decreased by about 33% on nights without torpor. Our field data gave an indication of daily torpor, which is used as a strategy for energy saving in free-living common swifts. |
format |
Text |
author |
Wellbrock, Arndt H. J. Eckhardt, Luca R. H. Kelsey, Natalie A. Heldmaier, Gerhard Rozman, Jan Witte, Klaudia |
author_facet |
Wellbrock, Arndt H. J. Eckhardt, Luca R. H. Kelsey, Natalie A. Heldmaier, Gerhard Rozman, Jan Witte, Klaudia |
author_sort |
Wellbrock, Arndt H. J. |
title |
Cool birds: first evidence of energy-saving nocturnal torpor in free-living common swifts Apus apus resting in their nests |
title_short |
Cool birds: first evidence of energy-saving nocturnal torpor in free-living common swifts Apus apus resting in their nests |
title_full |
Cool birds: first evidence of energy-saving nocturnal torpor in free-living common swifts Apus apus resting in their nests |
title_fullStr |
Cool birds: first evidence of energy-saving nocturnal torpor in free-living common swifts Apus apus resting in their nests |
title_full_unstemmed |
Cool birds: first evidence of energy-saving nocturnal torpor in free-living common swifts Apus apus resting in their nests |
title_sort |
cool birds: first evidence of energy-saving nocturnal torpor in free-living common swifts apus apus resting in their nests |
publisher |
The Royal Society |
publishDate |
2022 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9006018/ http://www.ncbi.nlm.nih.gov/pubmed/35414223 https://doi.org/10.1098/rsbl.2021.0675 |
genre |
Apus apus |
genre_facet |
Apus apus |
op_source |
Biol Lett |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9006018/ http://www.ncbi.nlm.nih.gov/pubmed/35414223 http://dx.doi.org/10.1098/rsbl.2021.0675 |
op_rights |
© 2022 The Authors. https://creativecommons.org/licenses/by/4.0/Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, provided the original author and source are credited. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1098/rsbl.2021.0675 |
container_title |
Biology Letters |
container_volume |
18 |
container_issue |
4 |
_version_ |
1766289115038351360 |