Physiology of temperature regulation: Comparative aspects

Bícego, Kênia C.; Barros, Renata C.H.; Branco, Luiz G.S.

doi:10.1016/j.cbpa.2006.06.032

Cited by 231 publications

(177 citation statements)

References 307 publications

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“…These negative results have been subsequently discussed. Several factors might have affected the results of these experiments: (i) the use of inappropriate dose of pyrogenic substances or bacteria, (ii) the use of various temperature gradient systems, and (iii) seasonal changes (Bicego et al, 2007;Cabanac, 1990). Moreover, it has been suggested that febrile response did actually occur in the experiments of Laburn et al (1981) and Zurovsky et al (1987a,b), but were masked by identical responses due to stress consequent to handling for the saline injections (Cabanac, 1990).…”

Section: Behavioral Fever In Ectothermic Vertebratesmentioning

confidence: 99%

Behavioral fever in ectothermic vertebrates

Rakus

Ronsmans

Vanderplasschen

2017

Developmental & Comparative Immunology

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a b s t r a c tFever is an evolutionary conserved defense mechanism which is present in both endothermic and ectothermic vertebrates. Ectotherms in response to infection can increase their body temperature by moving to warmer places. This process is known as behavioral fever. In this review, we summarize the current knowledge on the mechanisms of induction of fever in mammals. We further discuss the evolutionary conserved mechanisms existing between fever of mammals and behavioral fever of ectothermic vertebrates. Finally, the experimental evidences supporting an adaptive value of behavioral fever expressed by ectothermic vertebrates are summarized.

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Section: Behavioral Fever In Ectothermic Vertebratesmentioning

confidence: 99%

Behavioral fever in ectothermic vertebrates

Rakus

Ronsmans

Vanderplasschen

2017

Developmental & Comparative Immunology

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“…Birds are endothermic homeotherms and so depend mainly on endogenously produced heat to keep a constant and relatively high body temperature (Bicego et al, 2007;Yahav, 2015) (although many species are temporarily or regionally heterothermic; see McKechnie and Lovegrove, 2002;Eichhorn et al, 2011). However, nestlings of altricial species are poikilothermic and have little or no capacity to maintain core body temperature when exposed to temperatures below the thermal neutral zone (TNZ; where the heat produced by basal metabolism is enough to maintain a normothermic body temperature) during the first part of their life Baarendse et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Brood size constrains the development of endothermy in blue tits

Andreasson

Nord

Nilsson

2016

Journal of Experimental Biology

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Altricial birds are unable to maintain body temperature when exposed to low ambient temperatures during the first days after hatching. Thermoregulatory capacity begins to form as postnatal development progresses, and eventually nestlings become homeothermic. Several factors may influence this development at both the level of the individual and the level of the whole brood, but to our knowledge no studies have focused on the effect of brood size per se on the development of endothermy in individual nestlings. We performed cooling experiments on blue tit (Cyanistes caeruleus) nestlings in the field, to study how different experimental brood sizes affected the development of endothermy in individual nestlings and the thermal environment experienced by the whole brood in the nest. Nestlings from all experimental brood sizes showed a decrease in cooling rate as they grew older, but birds from reduced broods showed an earlier onset of endothermy compared with nestlings from enlarged and control broods. This difference manifested during early development and gradually disappeared as nestlings grew older. The thermal environment in the nests differed between treatments during nestling development, such that nest temperature in reduced broods was lower than that in enlarged broods during all days and during nights at the end of the experimental period. We suggest that the development of endothermy in blue tit nestlings is not ontogenetically fixed, but instead may vary according to differences in developmental, nutritional and thermal conditions as determined by brood size.

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“…However, speeding the rate of digestion and minimizing the costs of SDA may not be the only factors shaping the behaviour of these animals, as their starvation tolerance was indirectly proportional to the temperature. Reductions in the preferred temperatures have been reported in fasting insects and ectothermic vertebrates (reviewed in Bicego et al, 2007;Angilletta, 2009). Here we observed that as digestion progresses, the flies selected cooler temperatures.…”

Section: Discussionmentioning

confidence: 99%

The speed and metabolic cost of digesting a blood meal depends on temperature in a major disease vector

McCue

Boardman

Clusella‐Trullas

et al. 2016

Journal of Experimental Biology

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The energetics of processing a meal is crucial for understanding energy budgets of animals in the wild. Given that digestion and its associated costs may be dependent on environmental conditions, it is necessary to obtain a better understanding of these costs under diverse conditions and identify resulting behavioural or physiological trade-offs. This study examines the speed and metabolic costs -in cumulative, absolute and relative energetic terms -of processing a bloodmeal for a major zoonotic disease vector, the tsetse fly Glossina brevipalpis, across a range of ecologically relevant temperatures (25, 30 and 35°C). Respirometry showed that flies used less energy digesting meals faster at higher temperatures but that their starvation tolerance was reduced, supporting the prediction that warmer temperatures are optimal for bloodmeal digestion while cooler temperatures should be preferred for unfed or post-absorptive flies. 13C-Breath testing revealed that the flies oxidized dietary glucose and amino acids within the first couple of hours of feeding and overall oxidized more dietary nutrients at the cooler temperatures, supporting the premise that warmer digestion temperatures are preferred because they maximize speed and minimize costs. An independent test of these predictions using a thermal gradient confirmed that recently fed flies selected warmer temperatures and then selected cooler temperatures as they became post-absorptive, presumably to maximize starvation resistance. Collectively these results suggest there are at least two thermal optima in a given population at any time and flies switch dynamically between optima throughout feeding cycles.

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Physiology of temperature regulation: Comparative aspects

Cited by 231 publications

References 307 publications

Behavioral fever in ectothermic vertebrates

Behavioral fever in ectothermic vertebrates

Brood size constrains the development of endothermy in blue tits

The speed and metabolic cost of digesting a blood meal depends on temperature in a major disease vector

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