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- <meta content="Nicol, Stewart C." name="eprints.creators_name" />
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- <meta content="Echidnas (Tachyglossus aculeatus) are amongst the largest deep hibernators, but it is difficult to get them to hibernate normally under laboratory conditions. We measured body temperature (Tb) in 14 free-ranging echidnas using implanted data-loggers. Cooling during entry into hibernation bouts followed a Newtonian cooling curve, and conductances calculated from cooling curves were identical to those observed in cold exposed euthermic echidnas. Comparison with a reference soil temperature demonstrated that echidnas showed behavioural thermoregulation during hibernation; early in the hibernation season echidnas preferred to hibernate in cool areas, while during the coldest months they moved to warmer hibernacula, giving a preferred Tb in the range 8-10{degrees}C. Thermal buffering against excessive variation in Tb may be as important as maintaining a low Tb." name="eprints.abstract" />
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- <meta content="Bakken, G. S. (1976). An improved method for determining thermal conductance and equilibrium body temperature with cooling curve experiments. J.Therm. Biol. 1, 169-175.
- Bakken, G. S. and Gates, D. M. (1974). Heat loss from a Newtonian animal. J. Theor. Biol. 45, 283-292.
- Buck, C. L. and Barnes, B. M. (2000). Effects of ambient temperature on metabolic rate, respiratory quotient, and torpor in an arctic hibernator. Am. J. Physiol .Regul Integr. Comp. Physiol. 279, R255-262.
- Geiser, F. (2004). Metabolic rate and body temperature reduction during hibernation and daily torpor. Annu. Rev. Physiol. 66, 239-274.
- Green, B., Griffiths, M. and Newgrain, K. (1992). Seasonal patterns in water, sodium and energy turnover in free- living echidnas, Tachyglossus aculeatus (Mammalia, Monotremata). J. Zool. 227, 351-365.
- Grigg, G. and Beard, L. (2000). Hibernation by echidnas in mild climates: Hints about the evolution of endothermy? In Life in the cold: Eleventh international hibernation symposium, eds. G. Heldmaier and M. Klingenspor), pp. 5-19. Berlin: Springer.
- Grigg, G., Beard, L. and Augee, M. (2004). The evolution of endothermy and its diversity in mammals and birds. Physiol. Biochem. Zool. 77, 982-997.
- Grigg, G. C., Augee, M. L. and Beard, L. A. (1992). Thermal relations of free-living echidnas during activity and in hibernation in a cold climate. In Platypus and Echidnas, (ed. M. L. Augee), pp. 160-173. Mosman: Royal Zoological Society of New South Wales.
- Heldmaier, G. and Elvert, R. (2004). How to enter torpor: thermodynamic and physiological mechanisms of metabolic depression. In Life in the Cold: Evolution, Mechanisms, Adaptation and Application, Twelfth International Hibernation Symposium, eds. B. M. Barnes and H. V. Carey), pp. 183-198. Fairbanks, Alaska, USA: Institute of Arctic Biology, University of Alaska.
- Heldmaier, G., Steiger, R. and Ruf, T. (1993). Suppression of metabolic rate in hibernation. In Life in the Cold: Ecological, Physiological, and Molecular Mechanisms, eds. C. Carey G. L. Florant B. A. Wunder and B. Horwitz), pp. 545-548. Boulder, Colorado: Westview Press.
- KÃÂörtner, G. and Geiser, F. (1998). Ecology of natural hibernation in the marsupial mountain pygmy-possum (Burramys parvus). Oecologia 113, 170-178.
- Lasiewski, R. C. and Lasiewski, R., J. (1967). Physiological responses of Blue-throated and Rivoli's hummingbirds. Auk 84, 34-48.
- Lyman, C. P. (1982). Why bother to hibernate? In Hibernation and Torpor in Mammals and Birds, eds. C. P. Lyman J. S. Willis A. Malan and L. C. H. Wang), pp. 1-10. New York: Academic Press.
- Martin, C. J. (1902). Thermal adjustment and respiratory exchange in monotremes and marsupials.- A study in the development of homoeothermism. Philos. Trans. Roy. Soc. Lond. B. 195, 1-37.
- McNab, B. K. (1984). Physiological convergence amongst ant-eating and termite-eating mammals. J. Zool. 203, 485-510.
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- Nicol, S. and Andersen, N. A. (2003). Control of breathing in the echidna (Tachyglossus aculeatus) during hibernation. Comp. Biochem. Physiol. A. Mol. Integr. Physiol. 136, 917-925.
- Nicol, S. C. and Andersen, N. A. (1993). The physiology of hibernation in an egg-laying mammal, the echidna. In Life in the Cold III: Ecological, Physiological, and Molecular Mechanisms, eds. C. Carey G. F. Florant B. A. Wunder and B. Horwitz), pp. 55-64: Westview Press.
- Nicol, S. C. and Andersen, N. A. (1996). Hibernation in the echidna: not an adaptation to cold? In Adaptations to the Cold: Tenth International HibernationSymposium, eds. F. Geiser A. J. Hulbert and S. C. Nicol), pp. 7-12. Armidale: University of New England Press.
- Nicol, S. C. and Andersen, N. A. (2000). Patterns of hibernation of echidnas in Tasmania. In Life in the Cold: Eleventh International Hibernation Symposium, eds. G. Heldmaier and M. Klingenspor), pp. 21-29. Berlin: Springer.
- Nicol, S. C. and Andersen, N. A. (2002). The timing of hibernation in Tasmanian echidnas: why do they do it when they do? Comp. Biochem. Physiol. B. Biochem. Mol. Biol. 131, 603-611.
- Nicol, S. C. and Andersen, N. A. (in press). The life history of an egg-laying mammal, the echidna. Ecoscience accepted 10 April 2006 http://www.ecoscience.ulaval.ca/E_default.htm.
- Nicol, S. C. and Andersen, N. A. (in press). Rewarming rates and thermogenesis in hibernating echidnas. Comp. Biochem. Physiol. A. Mol. Integr. Physiol
- Nicol, S. C., Andersen, N. A. and Mesch, U. (1992). Metabolic rate and ventilatory pattern in the echidna during hibernation and arousal. In Platypus and Echidnas, (ed. M. L. Augee), pp. 150-159: Royal Zoological Society of NSW.
- Ortmann, S. and Heldmaier, G. (2000). Regulation of body temperature and energy requirements of hibernating Alpine marmots (Marmota marmota). Am. J. Physiol. Regul. Integr. Comp. Physiol. 278, R698-704.
- Robertson, S. L. and Smith, E. N. (1981). Thermal conductance and its relation to time constants. J.Therm. Biol. 6, 129-143.
- Smith, E. N. (1976). Heating and cooling rates of the American alligator, Alligator mississippiensis. Physiol. Zool. 49.
- Snyder, G. K. and Nestler, J. R. (1990). Relationships between body temperature, thermal conductance, Q10 and energy metabolism during daily torpor and hibernation in rodents. J Comp. Physiol. (B). 159, 667-675.
- Wilz, M. and Heldmaier, G. (2000). Comparison of hibernation, estivation and daily torpor in the edible dormouse, Glis glis. J. Comp. Physiol. (B) 170, 511-21.
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- <h1 class="ep_tm_pagetitle">Cooling rates and body temperature regulation of hibernating echidnas (Tachyglossus aculeatus)</h1>
- <p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Nicol, Stewart C.</span> and <span class="person_name">Andersen, Niels A.</span> (2007) <xhtml:em>Cooling rates and body temperature regulation of hibernating echidnas (Tachyglossus aculeatus).</xhtml:em> Journal of Experimental Biology, 210 (4). pp. 586-592. ISSN 1477-9145</p><p style="margin-bottom: 1em" class="not_ep_block"></p><table style="margin-bottom: 1em" class="not_ep_block"><tr><td valign="top" style="text-align:center"><a href="http://eprints.utas.edu.au/716/1/Nicol_et_al._2007_Cooling_rates_and_body_temperature_regulation_of_hibernating_echidnas_(Tachyglossus_aculeatus)_J_Exp_Biol.pdf"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" border="0" class="ep_doc_icon" /></a></td><td valign="top"><a href="http://eprints.utas.edu.au/716/1/Nicol_et_al._2007_Cooling_rates_and_body_temperature_regulation_of_hibernating_echidnas_(Tachyglossus_aculeatus)_J_Exp_Biol.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />320Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input value="728" name="docid" accept-charset="utf-8" type="hidden" /><div class=""><input value="Request a copy" name="_action_null" class="ep_form_action_button" onclick="return EPJS_button_pushed( '_action_null' )" type="submit" /> </div></form></td></tr></table><p style="margin-bottom: 1em" class="not_ep_block">Official URL: <a href="http://dx.doi.org/10.1242/jeb.02701">http://dx.doi.org/10.1242/jeb.02701</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">Echidnas (Tachyglossus aculeatus) are amongst the largest deep hibernators, but it is difficult to get them to hibernate normally under laboratory conditions. We measured body temperature (Tb) in 14 free-ranging echidnas using implanted data-loggers. Cooling during entry into hibernation bouts followed a Newtonian cooling curve, and conductances calculated from cooling curves were identical to those observed in cold exposed euthermic echidnas. Comparison with a reference soil temperature demonstrated that echidnas showed behavioural thermoregulation during hibernation; early in the hibernation season echidnas preferred to hibernate in cool areas, while during the coldest months they moved to warmer hibernacula, giving a preferred Tb in the range 8-10{degrees}C. Thermal buffering against excessive variation in Tb may be as important as maintaining a low Tb.</p></div><table style="margin-bottom: 1em" border="0" cellpadding="3" class="not_ep_block"><tr><th valign="top" class="ep_row">Item Type:</th><td valign="top" class="ep_row">Article</td></tr><tr><th valign="top" class="ep_row">Additional Information:</th><td valign="top" class="ep_row">Limited downloads available from: http://jeb.biologists.org/cgi/reprint/210/4/586.pdf?ijkey=9BR05ajZ0Xojxba&keytype=finite
- </td></tr><tr><th valign="top" class="ep_row">Keywords:</th><td valign="top" class="ep_row">echidna, monotreme, hibernation, cooling, thermoregulation, conductance</td></tr><tr><th valign="top" class="ep_row">Subjects:</th><td valign="top" class="ep_row"><a href="http://eprints.utas.edu.au/view/subjects/270799.html">270000 Biological Sciences > 270700 Ecology and Evolution > 270799 Ecology and Evolution not elsewhere classified</a><br /><a href="http://eprints.utas.edu.au/view/subjects/270604.html">270000 Biological Sciences > 270600 Physiology > 270604 Comparative Physiology</a><br /><a href="http://eprints.utas.edu.au/view/subjects/270601.html">270000 Biological Sciences > 270600 Physiology > 270601 Animal Physiology - Biophysics</a></td></tr><tr><th valign="top" class="ep_row">Collections:</th><td valign="top" class="ep_row">UNSPECIFIED</td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">716</td></tr><tr><th valign="top" class="ep_row">Deposited By:</th><td valign="top" class="ep_row"><span class="ep_name_citation"><span class="person_name">Associate Professor Stewart C. Nicol</span></span></td></tr><tr><th valign="top" class="ep_row">Deposited On:</th><td valign="top" class="ep_row">08 Feb 2007</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">11 Feb 2008 11:45</td></tr><tr><th valign="top" class="ep_row">ePrint Statistics:</th><td valign="top" class="ep_row"><a target="ePrintStats" href="/es/index.php?action=show_detail_eprint;id=716;">View statistics for this ePrint</a></td></tr></table><p align="right">Repository Staff Only: <a href="http://eprints.utas.edu.au/cgi/users/home?screen=EPrint::View&eprintid=716">item control page</a></p>
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