F. Geiser

Publications282
h-index56
Citations11,113
Highly Influential Citations567
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Metabolic rate and body temperature reduction during hibernation and daily torpor.
  • F. Geiser
  • Biology, Medicine
  • Annual review of physiology
  • 11 February 2004
TLDR
The comparative analysis provided here suggests that MR reduction depends on patterns of torpor used, the state of tor porpor, and body mass, which in turn affects metabolic inhibition and energy conservation. Expand
Hibernation versus Daily Torpor in Mammals and Birds: Physiological Variables and Classification of Torpor Patterns
TLDR
Comparisons of several physiological variables appear to justify a distinction between the two torpor patterns, but of all variables tested, only the frequency distributions of maximum torpor bout duration and the minimum V̇o2 showed a clear gap between daily heterotherms and hibernators. Expand
Daily torpor and hibernation in birds and mammals
  • T. Ruf, F. Geiser
  • Biology, Medicine
  • Biological reviews of the Cambridge Philosophical…
  • 1 August 2015
TLDR
The analysis strongly supports the view that hibernators and daily heterotherms are functionally distinct groups that probably have been subject to disruptive selection. Expand
Reduction of metabolism during hibernation and daily torpor in mammals and birds: temperature effect or physiological inhibition?
  • F. Geiser
  • Biology, Medicine
  • Journal of Comparative Physiology B
  • 2004
TLDR
Findings show that the reduction in metabolism during torpor of daily heterotherms and large hibernators can be explained largely by temperature effects, whereas a metabolic inhibition in addition to temperature effects may be used by small hibernator to reduce energy expenditure during torpora. Expand
EVOLUTION OF DAILY TORPOR AND HIBERNATION IN BIRDS AND MAMMALS: IMPORTANCE OF BODY SIZE
  • F. Geiser
  • Biology, Medicine
  • Clinical and experimental pharmacology…
  • 1 September 1998
1. The evolution of hibernation and daily torpor in mammals and birds remains a controversial subject. The original view was that use of torpor reflects a primitive thermoregulation, as it occurs in… Expand
Periodic arousals in hibernating mammals: is evaporative water loss involved?
TLDR
It is suggested that torpor bout duration may be influenced by EWL, indicating that animals may need to obtain free water when they arouse and an analysis of the structural and temperature characteristics of ground squirrel hibernacula suggests that they may function as a biological condensing tower. Expand
Torpor Duration in Relation to Temperature and Metabolism in Hibernating Ground Squirrels
TLDR
It is concluded that T_{b} per se also contributes, along with metabolism, to determining the length of torpor bouts, and the hypothesis that arousal is determined by accumulation of metabolites during torpor is confirmed. Expand
Torpor, thermal biology, and energetics in Australian long-eared bats (Nyctophilus)
TLDR
The study suggests that Australian Nyctophilus bats have a low basal metabolic rate and that their patterns of torpor are similar to those measured in bats from the northern hemisphere. Expand
THE TEMPORAL ORGANIZATION OF DAILY TORPOR AND HIBERNATION: CIRCADIAN AND CIRCANNUAL RHYTHMS
TLDR
It is reviewed whether circadian and circannual rhythms, important in the timing of biological events in active animals, also play an important role during torpor when Tb is reduced substantially and may even fall below 0°C, and there is little evidence it is significantly affected by low Tb. Expand
Polyunsaturated lipid diet lengthens torpor and reduces body temperature in a hibernator.
TLDR
Dietary adjustments apparently influence the control of body temperature by the central nervous system, which results in a modification of the pattern of torpor in hibernating chipmunks. Expand
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