Search Results - "GEISER, Fritz"

Seasonal Expression of Avian and Mammalian Daily Torpor and Hibernation: Not a Simple Summer-Winter Affair by Geiser, Fritz

“…Daily torpor and hibernation (multiday torpor) are the most efficient means for energy conservation in endothermic birds and mammals and are used by many small…”
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Daily torpor and hibernation in birds and mammals by Ruf, Thomas, Geiser, Fritz

“…ABSTRACT Many birds and mammals drastically reduce their energy expenditure during times of cold exposure, food shortage, or drought, by temporarily abandoning…”
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Metabolic rate and body temperature reduction during hibernation and daily torpor by Geiser, Fritz

“…Although it is well established that during periods of torpor heterothermic mammals and birds can reduce metabolic rates (MR) substantially, the mechanisms…”
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Long-term survival, temperature, and torpor patterns by Geiser, Fritz, Ruf, Thomas

“…Mammalian and avian torpor is highly effective in reducing energy expenditure. However, the extent of energy savings achieved and thus long-term survival…”
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Growing Up in a Changing Climate: How Temperature Affects the Development of Morphological, Behavioral and Physiological Traits of a Marsupial Mammal by Stawski, Clare, Geiser, Fritz

“…Climate change is likely to affect many mammalian phenotypes, yet little is known whether and how phenotypic plasticity is involved in responding to thermal…”
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Pronounced differences in heart rate and metabolism distinguish daily torpor and short-term hibernation in two bat species by Currie, Shannon E., Körtner, Gerhard, Geiser, Fritz

“…Torpor, and its differential expression, is essential to the survival of many mammals and birds. Physiological characteristics of torpor appear to vary between…”
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Hypothesis and Theory: A Two-Process Model of Torpor-Arousal Regulation in Hibernators by Ruf, Thomas, Giroud, Sylvain, Geiser, Fritz

“…Hibernating mammals drastically lower their metabolic rate (MR) and body temperature (T b ) for up to several weeks, but regularly rewarm and stay euthermic…”
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Will temperature effects or phenotypic plasticity determine the thermal response of a heterothermic tropical bat to climate change? by Stawski, Clare, Geiser, Fritz

“…The proportion of organisms exposed to warm conditions is predicted to increase during global warming. To better understand how bats might respond to climate…”
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Developmental phenotypic plasticity in a marsupial by Riek, Alexander, Geiser, Fritz

“…Climate change is likely to substantially affect the distribution ranges of species. However, little is known about how different mammalian taxa respond…”
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Torpor and hypothermia: reversed hysteresis of metabolic rate and body temperature by Geiser, Fritz, Currie, Shannon E, O'Shea, Kelly A, Hiebert, Sara M

“…Regulated torpor and unregulated hypothermia are both characterized by substantially reduced body temperature (Tb) and metabolic rate (MR), but they differ…”
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Down but Not Out: The Role of MicroRNAs in Hibernating Bats by Yuan, Lihong, Geiser, Fritz, Lin, Benfu, Sun, Haibo, Chen, Jinping, Zhang, Shuyi

“…MicroRNAs (miRNAs) regulate many physiological processes through post-transcriptional control of gene expression and are a major part of the small noncoding…”
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Do Red Squirrels (Tamiasciurus hudsonicus) Use Daily Torpor During Winter? by Brigham, R. Mark, Geiser, Fritz

“…Given their relatively small body size, high thermoregulatory costs, and low metabolic rate, we tested the hypothesis that red squirrels (Tamiasciurus…”
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Phoenix from the Ashes: Fire, Torpor, and the Evolution of Mammalian Endothermy by Geiser, Fritz, Stawski, Clare, Wacker, Chris B, Nowack, Julia

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Heterothermy in a Small Passerine: Eastern Yellow Robins Use Nocturnal Torpor in Winter by Aharon-Rotman, Yaara, McEvoy, John F., Beckmann, Christa, Geiser, Fritz

“…Torpor is a controlled reduction of metabolism and body temperature, and its appropriate use allows small birds to adapt to and survive challenging conditions…”
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Hibernation by Geiser, Fritz

“…Hibernation (multiday torpor) and daily torpor in heterothermic mammals and birds are characterized by pronounced temporal reductions in body temperature,…”
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Precocious Torpor in an Altricial Mammal and the Functional Implications of Heterothermy During Development by Geiser, Fritz, Wen, Jing, Sukhchuluun, Gansukh, Chi, Qing-Sheng, Wang, De-Hua

“…Most mammals and birds are altricial, small and naked at birth/hatching. They attain endothermic thermoregulation at a fraction of their adult size at a…”
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A functional nexus between photoperiod acclimation, torpor expression and somatic fatty acid composition in a heterothermic mammal by Geiser, Fritz, Klingenspor, Martin, McAllan, Bronwyn M

“…The seasonal changes in thermal physiology and torpor expression of many heterothermic mammals are controlled by photoperiod. As function at low body…”
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Prey availability affects daily torpor by free-ranging Australian owlet-nightjars (Aegotheles cristatus) by Doucette, Lisa I, Brigham, R. Mark, Pavey, Chris R, Geiser, Fritz

“…Food availability, ambient temperatures (T a), and prevailing weather conditions have long been presumed to influence torpor use. To a large extent, this is…”
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Do implanted transmitters affect maximum running speed of two small marsupials? by Rojas, A. Daniella, Körtner, Gerhard, Geiser, Fritz

“…Radiotelemetry is used to quantify behavioral, ecological, and physiological variables of animals. Because of technological limitations, relative transmitter…”
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EVOLUTION OF DAILY TORPOR AND HIBERNATION IN BIRDS AND MAMMALS: IMPORTANCE OF BODY SIZE by Geiser, Fritz

“…SUMMARY 1. The evolution of hibernation and daily torpor in mammals and birds remains a controversial subject. The original view was that use of torpor…”
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