...Anna S. Przybylska-Piech; Małgorzata Jefimow ABSTRACT Nonresponding Siberian hamsters ( Phodopus sungorus ) do not develop the winter phenotype of white fur, low body mass ( M b ) and spontaneous torpor in response to short photoperiod. However, their thermoregulatory response to fasting remains...

... elevational distribution and tested their physiological response to novel abiotic conditions. First, at a central aviary within their current elevational range, we measured hovering metabolic rate to assess their response to oxygen conditions and torpor use to assess their response to thermal conditions...

... ). The benefit of being still: energy savings during winter dormancy in fish arise from inactivity and the cold, not metabolic rate depression . Proc. Biol. Sci. 285 , 20181593 . 10.1098/rspb.2018.1593 Staples , J. F. ( 2016 ). Metabolic flexibility: hibernation, torpor, estivation . Comp...

...Anusha Shankar; Isabelle N. H. Cisneros; Sarah Thompson; Catherine H. Graham; Donald R. Powers ABSTRACT Many 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...

... enters a quiescent state in which powerful drives to thermoregulate, eat and drink are suppressed. Similarly, cardiovascular and pulmonary reflexes originating in the brainstem are altered to permit the profoundly slow heart and breathing rates observed during torpor. The mechanisms underlying...

... between T a , metabolic rate and frequency of arousal from torpor. Body condition and humidity also affect energy expenditure but are usually considered secondary factors. We held tricolored bats ( Perimyotis subflavus ) in captivity under multiple environmental conditions to directly compare...

... these fishes into torpor to overwinter. Tautog, alternatively, retained myosin heavy chains, which likely increases locomotor capabilities when making short migrations to overwintering habitats. * Author for correspondence ( cmoran3@citadel.edu ) Competing interests The authors declare no competing...

... in a second individual twice decreased by 35%, nearly to the basal rate expected from its mass without a decrease in body temperature. The New Zealand rockwren's food habits, entrance into torpor and continuous residence in a thermally demanding environment suggest that it may hibernate. However...

... enter a prolonged state of physiological dormancy known as hibernation to survive unfavorable seasonal conditions. Our understanding of the mechanisms underpinning the rapid transition and adaptation to a hypothermic, metabolically suppressed winter torpor state remains limited partially because...

..., and the potential benefits arising from heterothermic responses that should correlate with body size/mass. We found that some individuals clearly entered torpor while others kept T b stable, and that there were also individuals that showed intermediate thermoregulatory patterns. Heterothermy was found to correlate...

...Matthew T. Andrews ABSTRACT Mammals maintain a constant warm body temperature, facilitating a wide variety of metabolic reactions. Mammals that hibernate have the ability to slow their metabolism, which in turn reduces their body temperature and leads to a state of hypothermic torpor...

...Steven J. Swoap; Gerhard Körtner; Fritz Geiser ABSTRACT The eastern pygmy possum ( Cercartetus nanus ) is a small marsupial that can express spontaneous short bouts of torpor, as well as multi-day bouts of deep hibernation. To examine heart rate ( f H ) control at various stages of torpor...

...% higher maximum longevity than non-hibernators. Increased longevity could theoretically be due to prolonged torpor directly slowing cellular damage and RTL shortening. However, although mitosis is arrested in mammals at low body temperatures, recent evidence points to accelerated RTL shortening during...

...Sebastian Alvarado; Timothy Mak; Sara Liu; Kenneth B. Storey; Moshe Szyf ABSTRACT Hibernating mammals conserve energy in the winter by undergoing prolonged bouts of torpor, interspersed with brief arousals back to euthermia. These bouts are accompanied by a suite of reversible physiological...

...Ireneusz Ruczyński; Theresa M. A. Clarin; Bjoern M. Siemers Bats, some species of rodents and some birds are able to save energy during the summer period by decreasing their body temperature and falling into torpor. Some studies indicate that torpor prevents sleeping and causes effects similar...

... that punctuates bouts of torpor. As a result, both the interbout arousal and the torpid state are characterized by high levels of nuclear-localized p53. Chromatin immunoprecipitation assays indicate that p53 binds DNA during the winter. Furthermore, p53 recruits RNA polymerase II, as indicated by nuclear run...

... of Biologists Ltd 2014 Evolution of endothermy Parental care hypothesis Thermoregulation Reproduction Torpor Madagascar Setifer setosus Tenrecinae All extant mammals are endotherms, capable of maintaining core body temperature ( T b ) above ambient temperatures ( T a ) through...

... ( ) during torpor, we simultaneously measured , f H and subcutaneous body temperature ( T sub ) of a hibernator, Gould's long-eared bats ( Nyctophilus gouldi , 9 g, N =18), at ambient temperatures ( T a ) between 0 and 25°C. At rest, f H of normothermic resting bats was negatively correlated with T...

... that hibernating bats were indeed sensitive to non-tactile disturbances. As noted by the author, this difference may have been attributable to some bats being in shallow torpor or even normothermic status in the field experiment, which are both states that are seldom exhibited in laboratory studies ( Thomas, 1995...

...Rob S. James; James F. Staples; Jason C. L. Brown; Shannon N. Tessier; Kenneth B. Storey SUMMARY Hibernation is a crucial strategy of winter survival used by many mammals. During hibernation, thirteen-lined ground squirrels, Ictidomys tridecemlineatus , cycle through a series of torpor bouts, each...