10.5061/DRYAD.T9Q56
Welcker, Jorg
University of Alaska Fairbanks
Norwegian Polar Institute
Speakman, John R.
University of Aberdeen
Institute of Genetics and Developmental Biology
Elliott, Kyle H.
University of Manitoba
Hatch, Scott A.
University of Alaska Fairbanks
Kitaysky, Alexander S.
University of Alaska Fairbanks
Data from: Resting and daily energy expenditures during reproduction are
adjusted in opposite directions in free-living birds
Dryad
dataset
2015
field metabolic rate
endothermy
Hypothermia
BMR
Body temperature
Rissa tridactyla
doubly-labeled water
2015-07-02T00:00:00Z
2015-07-02T00:00:00Z
en
https://doi.org/10.1111/1365-2435.12321
37445 bytes
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CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
1. Reproduction is energetically expensive, and daily energy expenditure
(DEE) often peaks during the period of rearing young. The “potentiation”
hypothesis predicts that high DEE needs to be sustained by a corresponding
up-regulation of metabolic machinery, thus a concomitant increase of the
resting metabolic rate (RMR) is expected. Alternatively, the
“compensation” hypothesis predicts that DEE and RMR are regulated
independently and animals may maintain low RMR to maximize the energy
available for reproduction. This might particularly be the case if DEE was
limited, e.g. by extrinsic food supply or intrinsic physiological factors.
2. We tested these hypotheses in free-living seabirds by manipulating
their energy demands (experimentally reduced or increased brood size) and
supplies (providing supplemental food), and simultaneously measuring their
DEE and RMR (by the doubly-labeled water method and an indirect hormonal
proxy, respectively). 3. In support of the ‘compensation’ hypothesis,
metabolic rates were adjusted independently and in opposite directions
with an increase of DEE and a decrease of the hormonal proxy for RMR in
individuals rearing young compared to birds with removed broods. Energy
expenditure of unfed birds with chicks appeared to be limited as
experimental brood enlargement did not cause an increase in DEE.
Supplemental feeding did not allow DEE to exceed this apparent limitation.
4. We propose that a reduction of the resting metabolism is a strategy to
increase allocation of energy to reproduction when DEE is constrained, and
that this constraint is unlikely to be related to food supply.
complete experimental dataFile containing DEE, fT3, body temperature and
cort measurements of manipulated an control nestsDEE-RMR_kittiwake.xlsx
Spitsbergen
Norway
Arctic