Ontogeny of non-shivering thermogenesis in Muscovy ducklings (Cairina moschata)

Teulier, Loïc; Rouanet, Jean‐Louis; Rey, Benjamin; Roussel, Damien

doi:10.1016/j.cbpa.2014.05.012

Cited by 24 publications

(18 citation statements)

References 40 publications

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“…Hence, the relatively high peripheral temperatures during diving that we observed in juveniles during their initial period at sea could potentially also be a consequence of insufficient thermogenic capacity, so that birds avoid a deeper temperature drop by maintaining some peripheral perfusion. However, as thermogenic capacity in birds develops rapidly during cold exposure (Barré and Roussel, 1986;Talbot et al, 2004;Teulier et al, 2014), such a mechanism should not extend beyond the first few weeks at sea. Similarly, in adult king penguins, Handrich et al (1997) found a progressive decrease in abdominal tissue temperatures during foraging trips of ∼1 week.…”

Section: Seasonal Changes In Body Condition and Insulation Statusmentioning

confidence: 99%

Apparent changes in body insulation of juvenile king penguins suggest an energetic challenge during their early life at sea

Enstipp

Bost

Bohec

et al. 2017

Journal of Experimental Biology

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Little is known about the early life at sea of marine top predators, like deep-diving king penguins (Aptenodytes patagonicus), although this dispersal phase is probably a critical phase in their life. Apart from finding favourable foraging sites, they have to develop effective prey search patterns as well as physiological capacities that enable them to capture sufficient prey to meet their energetic needs. To investigate the ontogeny of their thermoregulatory responses at sea, we implanted 30 juvenile king penguins and 8 adult breeders with a small data logger that recorded pressure and subcutaneous temperature continuously for up to 2.5 years. We found important changes in the development of peripheral temperature patterns of foraging juvenile king penguins throughout their first year at sea. Peripheral temperature during foraging bouts fell to increasingly lower levels during the first 6 months at sea, after which it stabilized. Most importantly, these changes re-occurred during their second year at sea, after birds had fasted for ∼4 weeks on land during their second moult. Furthermore, similar peripheral temperature patterns were also present in adult birds during foraging trips throughout their breeding cycle. We suggest that rather than being a simple consequence of concurrent changes in dive effort or an indication of a physiological maturation process, these seasonal temperature changes mainly reflect differences in thermal insulation. Heat loss estimates for juveniles at sea were initially high but declined to approximately half after ∼6 months at sea, suggesting that juvenile king penguins face a strong energetic challenge during their early oceanic existence.

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Section: Seasonal Changes In Body Condition and Insulation Statusmentioning

confidence: 99%

Apparent changes in body insulation of juvenile king penguins suggest an energetic challenge during their early life at sea

Enstipp

Bost

Bohec

et al. 2017

Journal of Experimental Biology

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“…Implanted rabbits were placed in a cylindrical metabolic chamber offering limited movement (internal diameter 240 mm, height 200 mm) and metabolic rate was continuously measured during 12 h (between 07:00 and 19:00) using an open-circuit respirometer (Teulier et al, 2014). During this period, ambient temperature was stabilized for a minimum of 1 h (range 62 to 112 min) at each of the following temperatures: 25, 20, 15, 10, 5, 0 and −7°C.…”

Section: Measurements Of Resting Metabolic Ratementioning

confidence: 99%

Estimating resting metabolic rate by biologging core and subcutaneous temperature in a mammal

Rey

Halsey

Hetem

et al. 2015

Comparative Biochemistry and Physiology Part A: Molecular &

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“…The 0.5 value in the equation above is included to account for the fact that absolute temperature differences include both the decreases in T b as well as the increases over time, which would be symmetrical over a 24-h period in a homeothermic animal. These values were normalized to previously measured basal metabolic heat production (5 W kg 21 and 8 W kg 21 for 258C and 58C acclimated ducklings; [30,31]). …”

Section: (D) Incremental Cost Of Homeothermymentioning

confidence: 99%

“…Stressors at early life stages in birds can have long-lasting effects on energetics, growth and thermoregulation [29], thus we submitted ducklings to the energetic constraints of cold and food restriction. We examined thermally acclimated (cold versus thermoneutral, CA versus TN) animals in order to compare animals of differing thermogenic capacity; CA in ducklings upregulates non-shivering heat production and slightly raises basal metabolic rate (BMR) measured within the TN zone [30,31]. Our overall hypothesis was that prolonged energy deficits are countered by adjustments geared at reducing energy requirements.…”

Section: Introductionmentioning

confidence: 99%

Novel energy-saving strategies to multiple stressors in birds: the ultradian regulation of body temperature

et al. 2016

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This study aimed to examine thermoregulatory responses in birds facing two commonly experienced stressors, cold and fasting. Logging devices allowing long-term and precise access to internal body temperature were placed within the gizzards of ducklings acclimated to cold (CA) (58C) or thermoneutrality (TN) (258C). The animals were then examined under three equal 4-day periods: ad libitum feeding, fasting and re-feeding. Through the analysis of daily as well as short-term, or ultradian, variations of body temperature, we showed that while ducklings at TN show only a modest decline in daily thermoregulatory parameters when fasted, they exhibit reduced surface temperatures from key sites of vascular heat exchange during fasting. The CA birds, on the other hand, significantly reduced their short-term variations of body temperature while increasing long-term variability when fasting. This phenomenon would allow the CA birds to reduce the energetic cost of body temperature maintenance under fasting. By analysing ultradian regulation of body temperature, we describe a means by which an endotherm appears to lower thermoregulatory costs in response to the combined stressors of cold and fasting.

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Ontogeny of non-shivering thermogenesis in Muscovy ducklings (Cairina moschata)

Cited by 24 publications

References 40 publications

Apparent changes in body insulation of juvenile king penguins suggest an energetic challenge during their early life at sea

Apparent changes in body insulation of juvenile king penguins suggest an energetic challenge during their early life at sea

Estimating resting metabolic rate by biologging core and subcutaneous temperature in a mammal

Novel energy-saving strategies to multiple stressors in birds: the ultradian regulation of body temperature

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