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2 Acta Theriologica

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Evidence for spontaneous torpor in Crocidura flavescens

100%

Baxter R. M.

Acta Theriologica

1996

tom 41

nr 3

Periods of no activity between 02.00 and 10.00 and lasting for up to 7 h 40 min are reported for two captive Crocidura flavescens (I. Geoffroy, 1827). During one of these periods, the weight specific energy requirement of the shrew dropped to 25.1% of the usual, indicating a period of spontaneous torpor. Nest-box temperatures also drop during the periods of prolonged inactivity suggesting a lowered body temperature. Data for a younger animal suggest shorter periods of torpor. The timing of the torpor spans the coldest period of the day when the animal would expend most energy maintaining a constant body temperature.

Thermal energetics of torpid silver-haired bats Lasionycteris noctivagans

72%

Dunbar M. B.

Acta Theriologica

2007

tom 52

nr 1

Heterothermic endotherms can reduce energy expenditure by using controlled reductions in various physiological processes, collectively called torpor. Torpor is an important mechanism which allows many small endotherms to survive seasonal periods of inactivity, but there are few data on metabolic rate during torpor (TMR) for small, tree-living bats during winter. Therefore, I report TMR of silver-haired batsLasionycteris noctivagans (LeConte, 1831) measured at various ambient temperatures (Ta). Bats were captured in October 2004 in southwestern Missouri, USA. NoL. noctivagans had been captured at this time in this area previously. Mean body mass of 3 individuals was 10.49 g±0.3 SE. TMR varied with Ta and mean TMR was lowest at 5°C at 0.363 ml O2/h (2.03 mW). These data indicate that the TMR ofL. noctivagans is similar to another migratory, tree-roosting bat (the eastern red batLasiurus borealis; Müller, 1776), and suggest that Ta near 5°C is energetically optimal for hibernatingL. noctivagans in this area.