Thermal acclimation in a small Afrotropical Bird

Thompson, Lindy J.; Brown, Mark; Downs, Colleen T.

doi:10.1016/j.beproc.2016.04.018

Cited by 4 publications

(3 citation statements)

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“…When birds experience cold temperatures, they typically develop increased subcutaneous fat stores which act as both energy reserves and as a form of insulaEon (Houston et al 1997;Dubois et al 2016;Thompson et al 2016). In our study, ambient temperature appeared in models with strong support for predicEng variaEon in lipid mass (Table 2), however, based on model averaging, temperature was not a significant predictor (Table A2).…”

Section: Body Composi0on Was Affected By Temperature But Not Dietmentioning

confidence: 53%

“…McKechnie 2008; Dubois et al 2016;Thompson et al 2016), including changes in mitochondrial acEvity and density (Zheng et al 2013;Milbergue et al 2022). In contrast, responding to changes in dietary fat composiEon may take months before birds fully acclimate their Essues to reflect the diet being consumed (Carter et al 2019).…”

Section: Songbirds Can Acclimate To Temperatures In Relaevely Short P...mentioning

confidence: 99%

“…When zebra finches were exposed to cool condiEons, they developed significantly heavier pectoral muscles and visceral organs than individuals held at thermoneutrality, irrespecEve of the faJy acid content of their diet (Fig 2B , 2C). Muscle hypertrophy is a common 21 response in birds following cold acclimaEon, as the pectoralis is responsible for shivering thermogenesis (Vézina et al 2006;Liknes & Swanson 2011) and acts as a thermal buffer to reduce heat loss (Houston et al 1997;Thompson et al 2016). Visceral organs have relaEvely high mass-specific-metabolic rates (Weber & Piersma 1996;Chappell et al 1999;Wang et al 2001), and an increase in size allows for greater heat producEon (Liknes & Swanson 2011;Zheng et al 2013;Milbergue et al 2018).…”

Section: Body Composi0on Was Affected By Temperature But Not Dietmentioning

confidence: 99%

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Interactive effects of temperature acclimation and dietary fatty acids on metabolic rate and body composition of zebra finches (Taeniopygia guttata)

Campbell,

Mastromonaco,

Burness

2024

Preprint

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Climate change is contributing to geographic range shifts in many bird species, with possible exposure to novel diets. How individuals respond physiologically across chronic time frames to the interacting effects of diet and environmental temperature has been little explored. We acclimated zebra finches to either cool (20-24°C) or thermoneutral (35°C) temperatures over 6-months and provided them with diets enriched in either unsaturated or saturated fatty acids. We measured body mass throughout the study, and basal metabolic rate (BMR) and body composition at 3- and 6-months, respectively. Individuals held in cool conditions and fed a diet enriched with unsaturated fatty acids lost mass initially relative to the other groups, however, effects were reversible, and all individuals had a similar mass at 6- months. Chronic exposure to cool conditions increased BMR and the mass of the pectoral muscle and visceral organs. However, we could detect no long-term effect of diet on any physiological parameter. Our results contrast with those of birds studied over acute time frames, in which diet and temperature interact to determine energy expenditure. Over chronic time frames individuals appear to reach a new steady-state, with long-term physiological responses driven primarily by thermoregulatory responses to environmental temperature.Research Highlights:With climate change, birds may encounter novel diets and temperaturesIn zebra finches we show that chronic acclimation to cool temperatures increased energy expenditure and changed body composition.Dietary fatty acid content had little long-term impact on the physiological parameters we measured.

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Section: Body Composi0on Was Affected By Temperature But Not Dietmentioning

confidence: 53%