Evaporative water loss, respiratory pattern, gas ex change and acid-base balance during thermal panting in pekin ducks exposed to moderate heat

Bouverot, P; Hildwein, G; Goff, D. Le

doi:10.1016/0034-5687(74)90098-x

Cited by 86 publications

(13 citation statements)

References 20 publications

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“…The second involves increases in the rate of trans-cutaneous evaporation (Marder and Arieli, 1988;Webster and Bernstein, 1987), a process regulated over short time scales by adjustments to peripheral microcirculation (Ophir et al, 2002), and over longer time scales by changes in epidermal lipid composition (Haugen et al, 2003;Menon et al, 1989Menon et al, , 1988Muñoz-Garcia et al, 2008). The relative contributions of respiratory and cutaneous evaporative water loss (REWL and CEWL, respectively) to evaporative heat dissipation at high T a vary phylogenetically, with the data currently available indicating that REWL predominates in the Passeriformes (Tieleman and Williams, 2002;Wolf and Walsberg, 1996) and Galliformes (Bouverot et al, 1974;Richards, 1976). In contrast, CEWL represents the major avenue of heat dissipation at high T a in Columbiformes (Hoffman and Walsberg, 1999;Marder and Arieli, 1988;McKechnie and Wolf, 2004;Smith and Suthers, 1969;Webster and Bernstein, 1987;Withers and Williams, 1990).…”

Section: Introductionmentioning

confidence: 99%

Avian thermoregulation in the heat: efficient evaporative cooling allows for extreme heat tolerance in four southern Hemisphere columbids

McKechnie

Whitfield

Smit

et al. 2016

Journal of Experimental Biology

113

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Birds show phylogenetic variation in the relative importance of respiratory versus cutaneous evaporation, but the consequences for heat tolerance and evaporative cooling capacity remain unclear. We measured evaporative water loss (EWL), resting metabolic rate (RMR) and body temperature (T b ) in four arid-zone columbids from southern Africa [Namaqua dove (Oena capensis, ∼37 g), laughing dove (Spilopelia senegalensis, ∼89 g) and Cape turtle dove (Streptopelia capicola, ∼148 g)] and Australia [crested pigeon (Ocyphaps lophotes), ∼186 g] at air temperatures (T a ) of up to 62°C. There was no clear relationship between body mass and maximum T a tolerated during acute heat exposure. Maximum T b at very high T a was 43.1±1.0, 43.7±0.8, 44.7±0.3 and 44.3±0.8°C in Namaqua doves, laughing doves, Cape turtle doves and crested pigeons, respectively. In all four species, RMR increased significantly at T a above thermoneutrality, but the increases were relatively modest with RMR at T a =56°C being 32, 60, 99 and 11% higher, respectively, than at T a =35°C. At the highest T a values reached, evaporative heat loss was equivalent to 466, 227, 230 and 275% of metabolic heat production. The maximum ratio of evaporative heat loss to metabolic production observed in Namaqua doves, 4.66, exceeds by a substantial margin previous values reported for birds. Our results support the notion that cutaneous evaporation provides a highly efficient mechanism of heat dissipation and an enhanced ability to tolerate extremely high T a .

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Section: Introductionmentioning

confidence: 99%

Avian thermoregulation in the heat: efficient evaporative cooling allows for extreme heat tolerance in four southern Hemisphere columbids

McKechnie

Whitfield

Smit

et al. 2016

Journal of Experimental Biology

113

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“…Thus skin vascular resistance declines while intestinal vascular resistance increases in mammals during heat stress (Schonung et al 1971, Simon 1971. When comparing these data to ours on the panting duck, one must remember that panting is associated with only a slightly higher heat production (Bouverot et al 1974). Baudinette et al (1976) working on the herring gull documented that 37-56% of total heat production at rest was lost via the feet, while during flight, when metabolic heat production was estimated to be increased 7 times, approximately 80% of the total heat production was dissipated across the extremities.…”

Section: Discussionmentioning

confidence: 55%

“…During flight blood flow increased about 4 times through the sciatic artery. When comparing these data to ours on the panting duck, one must remember that panting is associated with only a slightly higher heat production (Bouverot et al 1974). Moreover, heat dissipation by convection and conduction becomes less important due to the Acta Physiol Scand.…”

Section: Discussionmentioning

confidence: 74%

Blood flow changes in the duck during thermal panting

Bech

Johansen

1980

Acta Physiologica Scandinavica

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Carotid and sciatic blood flow have been measured in resting and panting Pekin ducks using electromagnetic flowmeters. Panting induced by high ambient temperature caused the carotid blood flow to increase from 9.6 to 26.0 ml min-1, while the sciatic flow declined slightly from 41.6 to 38.1 ml min-1. During panting breathing rate increased 10--20 times, but there were no significant changes in heart rate and mean arterial blood pressure. The carotid peripheral resistance was therefore greatly reduced, whereas sciatic resistance remained unchanged or increased slightly. The vascular beds perfused by the sciatic (legs) and carotid (upper respiratory tract) arteries are both important for heat dissipation. This study shows that when heat dissipation from the naked legs becomes inefficient due to high ambient temperature, blood flow in the sciatic tended to decline while conversely panting was associated with a large increase in carotid flow.

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“…A second group (normovolaemic) received an i.v. infusion of isotonic saline at 0-1 ml/min, a rate which compensated for the calculated respiratory water loss (Bouverot et al 1974). In both groups of animals, 1 ml undiluted anti-ANP was given over 10 min.…”

Section: Preparation Of Animalsmentioning

confidence: 99%

Role of endogenous atrial natriuretic peptide in volume expansion diuresis and natriuresis of the Pekin duck

Gray

1994

Journal of Endocrinology

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Polyclonal antibodies raised in a rabbit against avian atrial natriuretic peptide (ANP) were shown to reduce circulating endogenous ANP levels in Pekin ducks by more than 90%, and were subsequently used to investigate the role of this peptide in volume expansion diuresis and natriuresis. Conscious birds, undergoing a steady-state diuresis and natriuresis maintained by an i.v. infusion of hypotonic saline at a rate of 0.7 ml/min, responded to ANP antiserum (anti-ANP) with an immediate 30% reduction in urine flow rate and sodium excretion which lasted for about 30 min. Plasma arginine vasotocin levels were not changed by anti-ANP whereas circulating angiotensin II concentrations increased immediately following the administration of anti-ANP. Serum from non-immunized normal rabbits produced no changes in the renal and plasma parameters monitored. The results show that the high circulating levels of endogenous ANP associated with volume expansion promote renal salt and fluid excretion and thus have a major physiological role in avian volume homeostasis.

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Evaporative water loss, respiratory pattern, gas ex change and acid-base balance during thermal panting in pekin ducks exposed to moderate heat

Cited by 86 publications

References 20 publications

Avian thermoregulation in the heat: efficient evaporative cooling allows for extreme heat tolerance in four southern Hemisphere columbids

Avian thermoregulation in the heat: efficient evaporative cooling allows for extreme heat tolerance in four southern Hemisphere columbids

Blood flow changes in the duck during thermal panting

Role of endogenous atrial natriuretic peptide in volume expansion diuresis and natriuresis of the Pekin duck

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