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Seasonal Metabolic Variation in Birds: Functional and Mechanistic Correlates
TLDR
The influence of seasonal changes in temperature and climate on metabolic rates in birds has been a topic of interest to ornithologists and ecophysiologists for decades, and resting metabolic rate is considered as the metabolic rate measured under the standard conditions.
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Seasonal Adjustments in Metabolism and Insulation in the Dark-Eyed Junco
TLDR
Insofar as winter increments in insulation do not offset increased thermogenic requirements at temperatures characteristic of this season, winter-acclimatization in Dark-eyed Juncos from western Oregon is similar to that for passerines from more severe winter climates in that it is primarily a metabolic process.
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Sources and significance of variation in basal, summit and maximal metabolic rates in birds
TLDR
The understanding of avian metabolic diversity would benefit from future studies of the functional and mechanistic links between lower and upper limits of metabolic power output, the environmental and ecological cues driving phenotypically flexible metabolic responses, and how responses to such cues might impact population responses to climate change.
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Seasonal Acclimatization of Thermoregulation in the Black-Capped Chickadee
TLDR
Black-capped Chickadees show seasonal metabolic acclimatization similar to, or greater than, other temperate wintering passerines in addition to behavioral adaptations and nocturnal hypothermia, which reduces costs associated with wintering in temperate latitudes.
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Substrate Metabolism under Cold Stress in Seasonally Acclimatized Dark-Eyed Juncos
  • D. Swanson
  • Environmental Science
    Physiological Zoology
  • 1 November 1991
TLDR
Data are consistent with a pattern of augmentedpreferential use of FFA to support shivering, coupled with sparing of muscle glycogen, in winter birds relative to summer birds, and the decrement of pectoralis lactate with hypothermia may suggest a link between a reduced ability to mobilize Muscle glycogen and the onset of Hypothermia.
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Passerines versus nonpasserines: so far, no statistical differences in the scaling of avian energetics.
We analyzed and compared the scaling of both basal and maximal thermogenic metabolic rates in passerine and nonpasserine birds using conventional and phylogenetic methods. In spite of the presumed…
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Relationship of Basal to Summit Metabolic Rate in Passerine Birds and the Aerobic Capacity Model for the Evolution of Endothermy
TLDR
Metabolic rates of the passerines in this study are consistent with the aerobic capacity model for the evolution of endothermy, as indicated by analyses generating phylogenetically independent contrasts.
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Evidence for a Proximate Influence of Winter Temperature on Metabolism in Passerine Birds
The roles of ultimate and proximate factors in regulating basal and summit metabolic rates of passerine birds during winter have received little study, and the extent to which winter temperatures…
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A comparative analysis of thermogenic capacity and cold tolerance in small birds
TLDR
Cold tolerance and Msum are measured in summer- and winter- acclimatized birds from southeastern South Dakota to suggest that cold tolerance and summit metabolism are phenotypically linked in small birds.
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Seasonal variation in cold tolerance, basal metabolic rate, and maximal capacity for thermogenesis in White-breasted Nuthatches Sitta carolinensis and Downy Woodpeckers Picoides pubescens, two…
TLDR
Winter increment of metabolism, coupled with only minor seasonal variation in body mass and fat scores in both species, indicates that both species rely more on metabolic adjustments than gross morphological adjustments for winter acclimatisation.
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