Hibernation in the Western Jumping Mouse (Zapus princeps)

Cranford, Jack A.

doi:10.2307/1380226

Cited by 60 publications

(49 citation statements)

References 22 publications

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“…The percentage of time bats from our study spent in torpor (99.6%) is considerably greater than that for other fat-storing hibernators such as western jumping mice [Zapus princeps, 95% (Cranford, 1978)], Columbian ground squirrels [Spermophilus columbianus, 95.4% (Young, 1990)], white-tailed prairie dogs [Cynomys leucurus, 85.8% (Bakko and Nohorniak, 1986)] and yellow-bellied marmots [Marmota flaviventris, 88.6% (Armitage et al, 2003)]. Moreover, bats appeared to express periods of shallow torpor in the midst of periodic arousals, which could increase energy savings during hibernation.…”

Section: Hibernation Patterns Of Bats Vs Rodentsmentioning

confidence: 64%

Hibernation energetics of free-ranging little brown bats

Jonasson

Willis

2012

Journal of Experimental Biology

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SUMMARYHibernation physiology and energy expenditure have been relatively well studied in large captive hibernators, especially rodents, but data from smaller, free-ranging hibernators are sparse. We examined variation in the hibernation patterns of free-ranging little brown bats (Myotis lucifugus) using temperature-sensitive radio-transmitters. First, we aimed to test the hypothesis that age, sex and body condition affect expression of torpor and energy expenditure during hibernation. Second, we examined skin temperature to assess whether qualitative differences in the thermal properties of the hibernacula of bats, compared with the burrows of hibernating rodents, might lead to different patterns of torpor and arousal for bats. We also evaluated the impact of carrying transmitters on body condition to help determine the potential impact of telemetry studies. We observed large variation in the duration of torpor bouts within and between individuals but detected no effect of age, sex or body condition on torpor expression or estimates of energy expenditure. We observed the use of shallow torpor in the midst of periodic arousals, which may represent a unique adaptation of bats for conservation of energy during the most costly phase of hibernation. There was no difference in the body condition of hibernating bats outfitted with transmitters compared with that of control bats captured from the same hibernaculum at the same time. This study provides new information on the energetics of hibernation in an underrepresented taxon and baseline data important for understanding how white-nose syndrome, a new disease devastating populations of hibernating bats in North America, may alter the expression of hibernation in affected bats. Supplementary material available online at

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Section: Hibernation Patterns Of Bats Vs Rodentsmentioning

confidence: 64%

Hibernation energetics of free-ranging little brown bats

Jonasson

Willis

2012

Journal of Experimental Biology

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“…In many of these laboratory studies, the onset of and arousal from torpor, the depth and duration of torpor bouts, and energetic savings have been determined by measuring metabolic rates (e.g., Hiebert 1990; Morris et al 1994;Coburn and Geiser 1996). In other cases, purely behavioural criteria have been used to determine when torpor occurs (e.g., lack of movement ;Cranford 1978;Geiser and Masters 1994).…”

Section: Introductionmentioning

confidence: 99%

What's hot and what's not: defining torpor in free-ranging birds and mammals

Barclay¹,

Lausen²,

Hollis³

2001

Can. J. Zool.

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With the development of small implantable data loggers and externally attached temperature-sensitive radio transmitters, increasing attention is being paid to determining the thermoregulatory strategies of free-ranging birds and mammals. One of the constraints of such studies is that without a direct measure of metabolic rate, it is difficult to determine the significance of lowered body temperatures. We surveyed the literature and found that many different definitions have been used to discriminate torpor from normothermy. Many studies use arbitrary temperature thresholds without regard for the normothermic body temperature of the individuals or species involved. This variation makes comparison among studies difficult and means that ecologically and energetically significant small reductions in body temperature may be overlooked. We suggest that normothermic body temperature for each individual animal should be determined and that torpor be defined as occurring when the body temperature drops below that level. When individuals' active temperatures are not available, a species-specific value should be used. Of greater value, however, are the depth and duration of torpor bouts. We suggest several advantages of this definition over those used in the past.Résumé : Avec l'avènement d'appareils enregistreurs de données plus petits et de transmetteurs radio sensibles à la température portés à l'extérieur, il devient de plus en plus courant de déterminer les stratégies thermorégulatrices des oiseaux et des mammifères en nature. L'une des contraintes reliées à ce genre d'étude est qu'en l'absence d'une mesure directe du taux de métabolisme, il est difficile de déterminer l'importance d'une baisse de température corporelle. Dans la littérature, plusieurs définitions différentes sont utilisées pour distinguer la torpeur de la normothermie. Dans plusieurs études, les seuils de température sont arbitraires et la température normothermique du corps des individus ou des espèces n'est pas prise en considération. Cette variation rend difficiles les comparaisons entre les études et il se peut alors que des réductions de la température corporelle petites, mais significatives des points de vue écologique et énergétique, ne soient pas détectées. Nous croyons que la température normothermique du corps doit être mesurée chez tous les individus et nous proposons que la torpeur soit définie comme l'état qui prévaut quand la température du corps descend au-dessous de ce niveau. Lorsqu'il est impossible de mesurer la température de tous les individus, une valeur spécifique devrait être utilisée. Plus importantes encore sont la profondeur et la durée des périodes de torpeur. Nous indiquons ici plusieurs avantages de cette définition par comparaison à celles reconnues auparavant.[Traduit par la Rédaction] 1890 Notes

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“…ochrogaster (Wagner) has been removed, Peromyscus maniculatus (Wagner) has subsequently shown a habitat shift (Redfield et al 1977, Abramsky et al 1979. Cranford (1977) performed several experimental removals of both Zapus princes J. A. Allen and Peromyscus maniculatus.…”

Section: The Community Matrixmentioning

confidence: 99%