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Heat loss in sleeping Garden Warblers (Sylvia borin) during migration

Ferretti, Andrea and Maggini, Ivan and Cardinale, Massimiliano and Fusani, Leonida (2020). Heat loss in sleeping Garden Warblers (Sylvia borin) during migration. Journal of Thermal Biology. 94 , 102772
[Research article]

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For small songbirds, energy is often a limiting factor during migration and, for this reason, they are forced to alternate nocturnal flights with stopovers to rest and replenish energy stores. Stopover duration has a key role for a successful migration and may have an important impact on fitness. Thus, migrants need to optimize their energy consumption at this stage to reduce their permanence at the site. A recent study has shown that lean individuals reduce their metabolic rate when tucking the head in the feathers during sleep. The underlying mechanism is very likely a reduction in conductance, but the thermoregulatory benefit of the increased insulation has never been quantified yet. Here, we compared heat loss in individual migratory birds while sleeping in different postures. Using a thermal camera and a within-individual approach, we estimated that Garden Warblers can reduce their rate of heat loss by 54% by sleeping with the head tucked in the feathers. This energy saving has a relevant impact on the individual’s energy balance because it can account for up to 8.69% of daily energy expenditure during stopover. Our study provides novel and important information to understand the fundamental role of thermoregulatory strategies on bird’s energy management.

Authors/Creators:Ferretti, Andrea and Maggini, Ivan and Cardinale, Massimiliano and Fusani, Leonida
Title:Heat loss in sleeping Garden Warblers (Sylvia borin) during migration
Series Name/Journal:Journal of Thermal Biology
Year of publishing :2020
Article number:102772
Number of Pages:7
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution-Noncommercial-No Derivative Works 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Zoology
Keywords:spring migration, stopover, thermo-imaging, sleep posture, songbird, heat dissipation
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Type of IDID
ID Code:18022
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Department of Aquatic Resources
Deposited By: SLUpub Connector
Deposited On:02 Nov 2020 07:43
Metadata Last Modified:15 Jan 2021 19:21

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