Thermoregulation and patterns of torpor in the spectacled dormouse,<i>Graphiurus ocularis</i>(A. Smith 1829) (Gliridae)

Ridgard, B.W.; Perrin, M.R.

doi:10.1080/03946975.1999.10539392

Cited by 10 publications

(2 citation statements)

References 28 publications

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“…They are thought to have a European origin (Montgelard et al , 2003). To date, torpor and/or hibernation have been reported in at least one species from each subfamily, namely Muscardinus (Juskaitis, 2005), Glis (Bieber & Ruf, 2009; Wilz & Heldmaier, 2000) and Glirulus (Shibata, Kawamichi & Nishibayashi, 2004) within Gliridae, Graphiurus (Ellison & Skinner, 1991; Perrin & Ridgard, 1999; Webb & Skinner, 1996; Whittington‐Jones & Brown, 1999) within Graphiurinae, and Eliomys (Montoya, Ambid & Agid, 1979) within Leithiinae. Extant dormice inhabit a remarkable range of habits from deserts (e.g.…”

Section: Existing Support For and Potential Tests Of The Pae Modelmentioning

confidence: 99%

The evolution of endothermy in Cenozoic mammals: a plesiomorphic‐apomorphic continuum

2011

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The evolution of endothermy in birds and mammals was one of the most important events in the evolution of the vertebrates. Past tests of hypotheses on the evolution of endothermy in mammals have relied largely on analyses of the relationship between basal and maximum metabolic rate, and artificial selection experiments. I argue that components of existing hypotheses, as well as new hypotheses, can be tested using an alternative macrophysiological modeling approach by examining the development of endothermy during the Cenozoic. Recent mammals display a 10°C range in body temperature which is sufficiently large to identify the selective forces that have driven the development of endothermy from a plesiomorphic (ancestral) Cretaceous or Jurassic condition. A model is presented (the Plesiomorphic-Apomorphic Endothermy Model, PAE Model) which proposes that heterothermy, i.e. bouts of normothermy (constant body temperature) interspersed with adaptive heterothermy (e.g. daily torpor and/or hibernation), was the ancestral condition from which apomorphic (derived), rigid homeothermy evolved. All terrestrial mammal lineages are examined for existing data to test the model, as well as for missing data that could be used to test the model. With the exception of Scandentia and Dermoptera, about which little is known, all mammalian orders that include small-sized mammals (<500 g), have species which are heterothermic and display characteristics of endothermy which fall somewhere along a plesiomorphic-apomorphic continuum. Orders which do not have heterothermic representatives (Cetartiodactyla, Perissodactyla, Pholidota, and Lagomorpha) are comprised of medium- to large-sized mammals that have either lost the capacity for heterothermy, or in which heterothermy has yet to be measured. Mammalian heterothermy seems to be plesiomorphic and probably evolved once in the mammalian lineage. Several categories of endothermy are identified (protoendothermy, plesioendothermy, apoendothermy, basoendothermy, mesoendothermy, supraendothermy, and reversed mesoendothermy) to describe the evolution of endothermy during the Cenozoic. The PAE Model should facilitate the testing of hypotheses using a range of macrophysiological methods (e.g. the comparative method and the reconstruction of ancestral states).

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Section: Existing Support For and Potential Tests Of The Pae Modelmentioning

confidence: 99%

The evolution of endothermy in Cenozoic mammals: a plesiomorphic‐apomorphic continuum

2011

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“…Through torpor mammals maximise energy conservation during periods of cold stress or shortage of food and water (Perrin and Ridgard 1999). Many experimental studies of dormancy patterns in dormice (Gliridae) have been carried out in captivity, involving several species, e.g., common dormouse (Muscardinus avellanarius) (Tomilin 1958;Walhovd 1974;Walhovd and Jensen 1976), edible dormouse (Glis glis) (Ko¨nig 1960;Wilz and Heldmaier 2000), garden dormouse (Eliomys quercinus) (Pajunen 1970(Pajunen , 1984, African woodland dormouse (Graphiurus murinus) (Webb and Skinner 1996), spectacled dormouse (Graphiurus ocularis) (Perrin and Ridgard 1999). Additionally Vogel (1997) presented a comparative study of hibernation in three dormouse species.…”

Section: Introductionmentioning

confidence: 99%

Daily torpor in free-ranging common dormice (Muscardinus avellanarius) in Lithuania

Juškaitis

2005

Mammalian Biology

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Torpid common dormice (Muscardinus avellanarius) were found in nestboxes during all the activity period from early April until late October. Prevalence of torpor among dormice was highest in spring, decreased considerably in summer and increased again in October. The proportion of adult dormice that were torpid was inversely related to mean monthly air temperature, except in September, when dormice prepare for hibernation by accumulating fat reserves. In spring and summer, torpid dormice were found when ambient temperature was up to 14-15 1C and in the arousal phase of torpor -up to 19-20 1C. In autumn, dormice were active at much lower ambient temperatures compared to spring and summer, and only dormice that were fat enough and ready for hibernation were torpid. Torpor bouts usually lasted only until noon, but also in the afternoon during persistently low ambient temperatures in April and October. In April-July, torpor was more frequent among adult males than females (75% vs. 46%), and pregnant females were never found in deep torpor. Prevalence of torpor among young-of-the-year was lower compared to adult dormice at the same time. In October, the average weight of torpid young-of-the-year dormice was significantly higher compared to the weight of active dormice (22.3 vs. 17.5 g).

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Diversity and Geography of Torpor and Heterothermy

Geiser

2021

Fascinating Life Sciences

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Thermoregulation and patterns of torpor in the spectacled dormouse,Graphiurus ocularis(A. Smith 1829) (Gliridae)

Cited by 10 publications

References 28 publications

The evolution of endothermy in Cenozoic mammals: a plesiomorphic‐apomorphic continuum

The evolution of endothermy in Cenozoic mammals: a plesiomorphic‐apomorphic continuum

Daily torpor in free-ranging common dormice (Muscardinus avellanarius) in Lithuania

Diversity and Geography of Torpor and Heterothermy

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