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Australian Mammalogy Australian Mammalogy Society
Journal of the Australian Mammal Society
RESEARCH ARTICLE

Refuge sites, activity and torpor in wild common dunnarts (Sminthopsis murina) in a temperate heathland

David C. Paull
+ Author Affiliations
- Author Affiliations

Zoology, University of New England, Armidale, NSW 2351, Australia. Current address: Ecobiological, PO Box 585, Warners Bay, NSW 2288, Australia. Email: dunnarts64@yahoo.com

Australian Mammalogy 35(2) 153-159 https://doi.org/10.1071/AM12016
Submitted: 29 March 2012  Accepted: 13 November 2012   Published: 1 March 2013

Abstract

This telemetric study describes patterns of movement, activity, refuge-site use and torpor in free-living Sminthopsis murina over one autumn/winter period in a warm-temperate habitat. S. murina were found to rest during the day in burrows and hollow logs. Individuals maintained several daytime refuges and foraged over several hectares each night. They were found to prefer agamid burrows where a daily temperature of 10.3–15.8°C was maintained when ambient surface temperatures varied between 3.5 and 24.6°C. Torpor was employed in 12 of 13 complete resting periods recorded. Dunnarts were found to use both long (>6 h) and short (<4 h) torpor bouts with a minimum skin temperature of 17.2–26.7°C. Typically, torpor occurred in the morning, though bouts into the afternoon were also recorded. Arousal rates from torpor were variable and were achieved by endogenous and passive means. Normothermic rest bouts tended to be short (mostly <3 h) though longer periods were recorded, with a mean resting skin temperature of 32.3 ± 0.8°C. The variable physiological responses observed in S. murina seem to follow a facultative pattern, and, along with long activity periods and their use of refuge sites, may be linked to variable invertebrate activity during cooler months.


References

Audet, D., and Thomas, D. W. (1996). Evaluation of the accuracy of body temperature measurement using external radio transmitters. Canadian Journal of Zoology 74, 1778–1781.
Evaluation of the accuracy of body temperature measurement using external radio transmitters.Crossref | GoogleScholarGoogle Scholar |

Barclay, R. M. R., Kalcounis, M. C., Crampton, L., Stefan, C., Vonhof, M. J., Wilkinson, L., and Brigham, M. (1996). Can external radiotransmitters be used to assess body temperature and torpor in bats? Journal of Mammalogy 77, 1102–1106.
Can external radiotransmitters be used to assess body temperature and torpor in bats?Crossref | GoogleScholarGoogle Scholar |

Crowcroft, P., and Godfrey, G. K. (1968). The daily cycle of activity in two species of Sminthopsis (Marsupialia: Dasyuridae). Journal of Animal Ecology 37, 63–74.
The daily cycle of activity in two species of Sminthopsis (Marsupialia: Dasyuridae).Crossref | GoogleScholarGoogle Scholar |

Dickman, C. R., Predavec, M., and Downey, F. J. (1995). Long-range movements of small mammals in arid Australia: implications for land management. Journal of Arid Environments 31, 441–452.
Long-range movements of small mammals in arid Australia: implications for land management.Crossref | GoogleScholarGoogle Scholar |

Dickman, C. R., Haythornthwaite, A. S., McNaught, G. H., Mahon, P. S., Tamayo, B., and Letnic, M. (2001). Population dynamics of three species of dasyurid marsupials in arid central Australia: a 10-year study. Wildlife Research 28, 493–506.
Population dynamics of three species of dasyurid marsupials in arid central Australia: a 10-year study.Crossref | GoogleScholarGoogle Scholar |

Fox, B. J. (1995). Common dunnart. In ‘Australian Museum Complete Book of Australian Mammals’. (Ed. R. Strahan). p. 418. (Angus & Robertson: Sydney.)

Fox, B. J., and Archer, E. (1984). The diets of Sminthopsis murina and Antechinus stuartii (Marsupialia: Dasyuridae) in sympatry. Australian Wildlife Research 11, 235–248.
The diets of Sminthopsis murina and Antechinus stuartii (Marsupialia: Dasyuridae) in sympatry.Crossref | GoogleScholarGoogle Scholar |

Frey, H. (1991). Energetic significance of torpor and other energy-conserving mechanisms in free-living Sminthopsis crassicaudata (Marsupialia: Dasyuridae). Australian Journal of Zoology 39, 689–708.
Energetic significance of torpor and other energy-conserving mechanisms in free-living Sminthopsis crassicaudata (Marsupialia: Dasyuridae).Crossref | GoogleScholarGoogle Scholar |

Geiser, F. (1986). Thermoregulation and torpor in the kultarr, Antechinomys laniger (Marsupialia: Dasyuridae). Journal of Comparative Physiology 156B, 751–757.

Geiser, F., and Baudinette, R. V. (1987). Seasonality of torpor and thermoregulation in three dasyurid marsupials. Journal of Comparative Physiology 157B, 335–344.

Geiser, F., and Baudinette, R. V. (1990). The relationship between body mass and rate of re-warmimg out of torpor in mammals. The Journal of Experimental Biology 151, 349–359.
| 1:STN:280:DyaK3czjvV2gtg%3D%3D&md5=35161f94c64a630121aca8da4c61d97fCAS |

Geiser, F., and Drury, R.L. (2003). Radiant heat affects thermoregulation and energy expenditure during rewarming from torpor. Journal of Comparative Physiology 173B, 55–60.

Geiser, F., and Pavey, C. (2007). Basking and torpor in a rock-dwelling desert marsupial: survival strategies in a resource-poor environment. Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology 177, 885–892.
Basking and torpor in a rock-dwelling desert marsupial: survival strategies in a resource-poor environment.Crossref | GoogleScholarGoogle Scholar |

Geiser, F., and Ruf, T. (1995). Hibernation versus daily torpor in mammals and birds: physiological variables and classification of torpor patterns. Physiological Zoology 68, 935–966.

Geiser, F., Augee, M. L., McCarron, H. C. K., and Raison, J. K. (1984). Correlates of torpor in the insectivorous dasyurid marsupial Sminthopsis murina. Australian Mammalogy 7, 185–191.

Geiser, F., Goodship, N., and Pavey, C. R. (2002). Was basking important in the evolution of mammalian endothermy? Naturwissenschaften 89, 412–414.
Was basking important in the evolution of mammalian endothermy?Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD38Xnt1ymsLc%3D&md5=588cd61fcb27cf9404c9bce6a2e1193dCAS |

Godfrey, G. K. (1968). Body temperature and torpor in Sminthopsis crassicaudata and S. larapinta (Marsupialia: Dasyuridae). Journal of Zoology 156, 499–511.
Body temperature and torpor in Sminthopsis crassicaudata and S. larapinta (Marsupialia: Dasyuridae).Crossref | GoogleScholarGoogle Scholar |

Haythornthwaite, A., and Dickman, C. (2000). Macrohabitat usage of the lesser hairy-footed dunnart Sminthopsis youngsoni in spinifex desert. In ‘Australian Mammal Society Annual Conference, 2000: Alice Springs’.

Holloway, J. C., and Geiser, F. (1995). Influence of torpor on daily energy expenditure of the dasyurid marsupial Sminthopsis crassicaudata. Comparative Biochemistry and Physiology 112A, 59–66.
| 1:CAS:528:DyaK2MXnvVylu7k%3D&md5=f8cd99c1b9a488bd07a157a14473c070CAS |

Holloway, J. C., and Geiser, F. (1996a). Reproductive status and torpor of the marsupial Sminthopsis crassicaudata: effect of photoperiod. Journal of Thermal Biology 21, 373–380.
Reproductive status and torpor of the marsupial Sminthopsis crassicaudata: effect of photoperiod.Crossref | GoogleScholarGoogle Scholar |

Holloway, J. C., and Geiser, F. (1996b). Effect of photoperiod on torpor and activity of Sminthopsis crassicaudata (Marsupialia). In ‘Adaptations to the Cold: Tenth International Hibernation Symposium’. (Eds F. Geiser, A. J. Hulbert and S. C. Nicol.) pp. 95–102. (University of New England Press: Armidale.)

Hudson, J.W., and Scott, I.M. (1979). Daily torpor in the laboratory mouse Mus musculus var. albino. Physiological Zoology 52, 205–218.

Körtner, G., Song, X., and Geiser, F. (1998). Rhythmicity of torpor in a marsupial hibernator, the mountain pygmy-possum (Burramys parvus) under natural and laboratory conditions. Journal of Comparative Physiology B 168, 631–638.
Rhythmicity of torpor in a marsupial hibernator, the mountain pygmy-possum (Burramys parvus) under natural and laboratory conditions.Crossref | GoogleScholarGoogle Scholar |

Körtner, G., and Geiser, F. (2000). Torpor and activity patterns in free-ranging sugar gliders Petaurus breviceps (Marsupialia). Oecologica 123, 350–357.
Torpor and activity patterns in free-ranging sugar gliders Petaurus breviceps (Marsupialia).Crossref | GoogleScholarGoogle Scholar |

Körtner, G., and Geiser, F. (2009). The key to winter survival: daily torpor in a small arid zone marsupial. Naturwissenschaften 96, 525–530.
The key to winter survival: daily torpor in a small arid zone marsupial.Crossref | GoogleScholarGoogle Scholar |

Körtner, G., Pavey, C. R., and Geiser, F. (2008). Thermal biology, torpor, and activity in free-living mulgaras in arid zone Australia during the winter reproductive season. Physiological and Biochemical Zoology 81, 442–451.
Thermal biology, torpor, and activity in free-living mulgaras in arid zone Australia during the winter reproductive season.Crossref | GoogleScholarGoogle Scholar |

Morton, S. R. (1978). Torpor and nest-sharing in free-living Sminthopsis crassicaudata (Marsupialia) and Mus musculus (Rodentia). Journal of Mammalogy 59, 569–575.
Torpor and nest-sharing in free-living Sminthopsis crassicaudata (Marsupialia) and Mus musculus (Rodentia).Crossref | GoogleScholarGoogle Scholar |

Paull, D.C. (2006). “The biology and ecophysiology of the Pilliga Mouse Pseudomys pilligaensis and the Common Dunnart Sminthopsis murina in Pilliga East State Forest.” Master of Resource Science Thesis, University of New England, Australia.

Pavey, C.R., Goodship, N., and Geiser, F. (2003). Home range and spatial organization of the rock-dwelling carnivorous marsupial Pseudantechinus macdonnellensis. Wildlife Research 30, 135–142.

Pavey, C. R., Burwell, C. J., Körtner, G., and Geiser, F. (2009). Vertebrate diet decreases winter torpor use in a desert marsupial. Naturwissenschaften 96, 679–683.
Vertebrate diet decreases winter torpor use in a desert marsupial.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD1MXlvV2lsrc%3D&md5=af9ca9c00c91485b1530df82fbe0c20fCAS |

Wang, L. C. H. (1989). Ecological, physiological, and biochemical aspects of torpor in mammals and birds. In ‘Advances in Comparative and Environmental Physiology’. (Ed. C. S. H. Wang.) pp. 361–401. (Springer: Berlin.)

Warnecke, L., and Geiser, F. (2009). Basking behaviour and torpor use in free-ranging Planigale gilesi. Australian Journal of Zoology 57, 373–375.
Basking behaviour and torpor use in free-ranging Planigale gilesi.Crossref | GoogleScholarGoogle Scholar |

Warnecke, L., and Geiser, F. (2010). The energetics of basking behaviour and torpor in a small marsupial exposed to simulated natural conditions. Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology 180, 437–445.
The energetics of basking behaviour and torpor in a small marsupial exposed to simulated natural conditions.Crossref | GoogleScholarGoogle Scholar |

Warnecke, L., Turner, J. M., and Geiser, F. (2008). Torpor and basking in a small arid zone marsupial. Naturwissenschaften 95, 73–78.
Torpor and basking in a small arid zone marsupial.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD1cXitFaisrs%3D&md5=933ff69499ba9db4aa32475a56f7c3e1CAS |

Warnecke, L., Cooper, C. E., Geiser, F., and Withers, P. C. (2010). Environmental physiology of a small marsupial inhabiting arid floodplains. Comparative Biochemistry and Physiology 157, 73–78.
Environmental physiology of a small marsupial inhabiting arid floodplains.Crossref | GoogleScholarGoogle Scholar | 1:STN:280:DC%2BC3cnot1Sjtg%3D%3D&md5=76b219919b86a8ce3808e7763dd7acf4CAS |