...Ewa Komar; Paulina A. Szafrańska; Dina K. N. Dechmann; Lara Keicher; Dominika Koprowska; J. Ryan Shipley; Ireneusz Ruczyński 1. Energy can be limiting, especially for small animals with high metabolisms, particularly if they rely on ephemeral resources. Some energy-saving strategies, such as torpor...

... the mating period, while females mainly allocate energy during gestation and lactation, we hypothesized that males would have to use shorter torpor bouts and longer periods of normothermic activity to promote spermatogenesis during winter, a period of low food availability. Here, we applied an acute 2 week...

... investigated the energy spent maintaining normothermy at different T a , as well as how much bats limit energy expenditure while in torpor. We found that, despite being exposed to T a as low as 1.1°C, bats did not increase torpid metabolic rate, thus indicating that E. nilssonii can survive and hibernate...

...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...

... Temperature Fish Hibernation Torpor Natural Sciences and Engineering Research Council of Canada Harrison McCain Foundation New Brunswick Innovation Foundation http://dx.doi.org/10.13039/501100000240 University of New Brunswick http://dx.doi.org/10.13039...

...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 ( [email protected] ) 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...

... ( ) 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...