Data from: Testing the heat dissipation limit theory in a breeding passerine
| Main Authors: | Nilsson, Jan-Åke, Nord, Andreas |
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| Format: | info dataset Journal |
| Terbitan: |
, 2018
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/4992836 |
Daftar Isi:
- The maximum work rate of animals has recently been suggested to be determined by the rate at which excess metabolic heat generated during work can be dissipated (heat dissipation limitation theory; HDL). As a first step towards testing this theory in wild animals, we experimentally manipulated brood size in breeding marsh tits (Poecile palustris) to change their work rate. Parents feeding nestlings generally operated at above-normal body temperatures. Body temperature in both males and females increased with maximum ambient temperature and with manipulated work rate, sometimes even exceeding 45 °C, which is close to suggested lethal levels for birds. Such high body temperatures have previously only been described for birds living in hot and arid regions. Thus, reproductive effort in marsh tits may potentially be limited by the rate of heat dissipation. Females had lower body temperatures, a possible consequence of their brood patch serving as a thermal window facilitating heat dissipation. Because increasing body temperatures are connected to somatic costs, we suggest that the HDL theory may constitute a possible mediator of the trade-off between current and future reproduction. It follows that globally increasing, more stochastic, ambient temperatures may restrict the capacity for sustained work of animals in the future.
- females"Female.xlsx" Box = Identity of nest box Idfemale = Identity of female Femage = female age; 2 = a female in her second calendar year etc. Female temp = Female body temperature Year = 1 denotes 2010 and 2 denotes 2011 Exp = Experimental category; 1 = enlarged, 2 = control, 3 = reduced broods Brood = Number of nestlings in the brood after manipulation Amb temp = Maximum ambient temperature Day = The age of the nestlings when the female body temperature was measuredmales"Male.xlsx" Box = Identity of nest box Idmale = Identity of male Maleage = male age; 2 = a male in his second calendar year etc. Male temp = Male body temperature Year = 1 denotes 2010 and 2 denotes 2011 Exp = Experimental category; 1 = enlarged, 2 = control, 3 = reduced broods Brood = Number of nestlings in the brood after manipulation Amb temp = Maximum ambient temperature Day = The age of the nestlings when the male body temperature was measuredinter-reading"Inter-reading.xlsx" Box = Identity of nest box Sex = Sex of the bird; 1 = male; 2 = female Diff. = The difference between the first and the third body temperature reading