Who Is Who among the Hibernators

Lyman, Charles P.; Willis, John S.; Малан, А.; Wang, Lawrence C.H.

doi:10.1016/b978-0-12-460420-9.50006-4

Cited by 40 publications

(16 citation statements)

References 75 publications

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“…Animals that have been atropinized before they begin to enter hibernation rarely succeed in entering hibernation. Lyman (1982) also observed in marmots that arrhythmias in heart rate caused by skipped or extra beats as occurred during reduction period disappeared with atropin treatment. Hence it was concluded that the increased parasympathetic activity modulates and decelerate heart rate (Lyman, 1982;Zimmer et al, 2000).…”

Section: Preparation For Entrance Into Torpormentioning

confidence: 80%

“…Ground squirrels (Citellus tridecemlineatus) similarly decline breathing rate, heart rate and body temperature while the fall of T b lagged behind the drop of breathing and heart rates (Landau and Dawe, 1958). In woodchucks (Marmota monax) entering hibernation spontaneously Lyman (1982) observed a simultaneous decrease of heart rate with metabolic rate, and they also reached hibernation values several hours before body temperature. In alpine marmots (Marmota marmota) minimum M O ∑ is achieved after 10·h, but body temperature virtually decreased throughout the entire hibernation bout until the beginning of the next arousal (Ortmann and Heldmaier, 2000).…”

Section: Preparation For Entrance Into Torpormentioning

confidence: 99%

“…Present data obtained from dormice entering torpor support these results -they even complete the known results of active metabolic suppression with a simultaneous depression of ventilation frequency and heart rate. It has been suggested that the reduction of heart rate during entrance into torpor is under parasympathetic control (see Lyman, 1982), i.e. that heart rate is modulated by changing the balance between parasympathetic and sympathetic tone (Harris and Milsom, 1995).…”

Section: Preparation For Entrance Into Torpormentioning

confidence: 99%

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Cardiorespiratory and metabolic reactions during entrance into torpor in dormice, Glis glis

Elvert¹,

Heldmaier

2005

Journal of Experimental Biology

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Dormice voluntarily enter torpor at ambient temperatures ranging between 0-28°C. This study describes heart rate, ventilation frequency, O 2 -consumption (defined as metabolic rate), CO 2 -production and body temperature during entrance into torpor. Their temporal relationship was analysed during the time course of metabolic depression at different ambient temperatures. Body temperature and heart rate were measured in unrestrained dormice with implanted transmitter. Ventilation frequency was monitored by total body plethysmography or infrared video monitoring. To compare entries into torpor at different T a these periods were distinguished into four different phases: the resting phase prior to torpor, the phase of pre-torpor adjustments, the reduction phase and the phase of steady state torpor. In the pre-torpor phase, dormice increased their ventilation, metabolic rate and heart rate, indicating that the torpid state is initiated by an enhanced metabolic activity for about an hour. This was followed by a rapid reduction of ventilation, metabolism and heart rate, which reached their minimum values long before body temperature completed its decline. The results of the present study show that the entrance into torpor is caused by an active respiratory, cardiac and metabolic depression.

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Section: Preparation For Entrance Into Torpormentioning

confidence: 80%

Section: Preparation For Entrance Into Torpormentioning

confidence: 99%

Section: Preparation For Entrance Into Torpormentioning

confidence: 99%

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Cardiorespiratory and metabolic reactions during entrance into torpor in dormice, Glis glis

Elvert¹,

Heldmaier

2005

Journal of Experimental Biology

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“…They can increase body insulation (Cherry and Verner, 1975;Rinehart-Whitt and Pagels, 2000;Kuhlmann et al, 2003), increase or decrease body mass (m b ) (Morrison, 1960;Hoffmann, 1973;Armitage et al, 1976;Heldmaier et al, 2004), increase m b -specific metabolic rate (Heldmaier and Steinlechner, 1981a) and increase the efficiency of heat production, especially by means of non-shivering thermogenesis (NST) (Heldmaier and Buchberger, 1985;Merritt et al, 2001;Bao et al, 2002). In winter, animals stay active or enter daily or seasonal torpor (Hoffmann, 1973;Lyman, 1982b;Körtner and Geiser, 2000;Heldmaier et al, 2004). Although heterothermy is generally considered to be an energy-saving strategy, it also entails considerable costs related to periodic arousal from torpor and interbout normothermy (Thomas et al, 1990;Dunbar and Tomasi, 2006;Wojciechowski et al, 2007;Karpovich et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Social thermoregulation and torpor in the Siberian hamster

Jefimow

Głabska

Wojciechowski

2011

Journal of Experimental Biology

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SUMMARYSocial thermoregulation and huddling bring about energy benefits to animals sharing a nest because of the smaller surface-tovolume ratio of a huddle and the higher local temperature in the nest. We tested whether living in groups and huddling affect daily torpor, metabolic rate and seasonal changes in the body mass of a small heterothermic rodent, the Siberian hamster (Phodopus sungorus), housed under semi-natural conditions both singly and in groups of four litter-mates. We predicted that in hamsters housed in groups: (1) synchronized torpor bouts would be longer and deeper than non-synchronized ones but shallower than in solitary hamsters, (2) seasonal variations in metabolic rate would be lower than in solitary hamsters, and (3) the winter decrease in body mass would be smaller in grouped than in singly housed hamsters. We found that group housing led to a smaller decrease in body mass in winter, and affected the length and depth of daily torpor. In group-living hamsters more than 50% of all torpor episodes were synchronized and torpid animals were often found in huddles formed of all cage-mates. The longest and deepest torpor bouts in groups were recorded when all animals in a group entered torpor simultaneously. Although the minimum body temperature during torpor was higher, torpor duration was slightly longer than in solitary hamsters. We did not record significant differences in the body mass-adjusted rate of oxygen consumption between solitary and grouped animals, either in the cold or at the lower critical temperature. We conclude that social thermoregulation enables maintenance of a larger body mass, and thus a larger body fat content, which can ensure better body condition at the beginning of the reproductive season.

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“…The warm-blooded animals have an inherent response mode for cold winter conditions. These animals show long sleep periods, reducing metabolic rate and lowering the body temperature (3)(4)(5)(6)(7). Their metabolic rate at the time of deep sleep is much slower than that of the normal daily life (8,9).…”

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confidence: 99%

The Cytologic Investigation of Brown Adipose Tissue of D.laniger (Felten & Storch, 1968) (Mammalia: Rodentia) in Hibernation

et al. 2015

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A ll living things show various adaptations to cope with the challenges in the environmental conditions. With the changes in the temperature at winter, the challenges arise such as to find food to meet the required amount of energy. Some of the behavioral characteristics of the animals are intended to prevent or to reduce the heat loss from the body (1). The selection of suitable feeding grounds with the desired thermal property is one of the behaviors that reduces heat loss. Nest construction and also behaviors to come together are the behaviors that are aimed at maintaining the body temperature. Most living things are somnolent and minimize their energy requirements by lowering metabolism in order to overcome these kinds of difficulties (1). Mammals has been evolved as having the proficiency to keep the body temperature higher than that of the environment (ambient) and at that level constant using the heat produced by internal

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Who Is Who among the Hibernators

Cited by 40 publications

References 75 publications

Cardiorespiratory and metabolic reactions during entrance into torpor in dormice, Glis glis

Cardiorespiratory and metabolic reactions during entrance into torpor in dormice, Glis glis

Social thermoregulation and torpor in the Siberian hamster

The Cytologic Investigation of Brown Adipose Tissue of D.laniger (Felten & Storch, 1968) (Mammalia: Rodentia) in Hibernation

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