Langzeittelemetrie der Körpertemperatur mit synchroner Bestimmung des Energiestoffwechsels beim Blaunackenmausvogel (Urocolius macrourus) unter Normal- und Lethargiebedingungen (Torpor)

Prinzinger, Roland; Schleucher, Elke; Preßmar, Andrea

doi:10.1007/bf01640473

Cited by 14 publications

(3 citation statements)

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“…We propose three reasons for why this form of shallow torpor in birds has so rarely been detected [35]. First, small drops in oxygen consumption or body temperature might have been overlooked.…”

Section: Discussionmentioning

confidence: 97%

“…Yet in contrast to mammals, birds that are known to use deep torpor do not seem to use a shallower version of torpor by regulating their body temperatures above this minimum [1,5,15,20,[32][33][34]. One mousebird species has been described to use both shallow and deep torpor when starved over several days, with their depth of torpor deepening as their energy stores were depleted [35,36]. However, mousebirds are thought to have diverged early in the avian phylogeny and their unusual combination (among birds) of low-quality plant diet with a relatively small body size makes them physiologically distinct in other ways.…”

Section: Introductionmentioning

confidence: 99%

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Facultative variation across a shallow to deep torpor spectrum in hummingbirds

Shankar

Cisneros

Thompson

et al. 2021

Preprint

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Many small endotherms use torpor, saving energy by a controlled reduction of their body temperature and metabolic rate. Some species (e.g. arctic ground squirrels, hummingbirds) enter deep torpor, dropping their body temperatures by 23-37 °C, while others can only enter shallow torpor (e.g., pigeons, 3-10 °C reductions). However, deep torpor in mammals can increase predation risk (unless animals are in burrows or caves), inhibit immune function, and result in sleep deprivation, so even for species that can enter deep torpor, facultative shallow torpor might help balance energy savings with these potential costs. Deep torpor occurs in three avian orders. Although the literature hints that some bird species can use both shallow and deep torpor, little empirical evidence of such an avian torpor spectrum exists. We infrared imaged three hummingbird species that are known to use deep torpor, under natural temperature and light cycles, to test if they were also capable of shallow torpor. All three species used both deep and shallow torpor, often on the same night. Depending on the species, they used shallow torpor for 5-35% of the night. The presence of a bird torpor spectrum indicates a capacity for fine-scale physiological and genetic regulation of avian torpid metabolism.

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Section: Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Facultative variation across a shallow to deep torpor spectrum in hummingbirds

Shankar

Cisneros

Thompson

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…To date, eight avian families have been described with at least one member species having the ability to undergo a state of daily torpor (Ruf and Geiser, 2015). With only one known exception, avian MRD involves daily torpor rather than hibernation, and is almost always restricted to the rest-phase of a circadian cycle (Jaeger, 1949;Prinzinger et al, 1992;Schleucher, 2004;Woods et al, 2019).…”

Section: Introductionmentioning

confidence: 99%