Energetics, thermoregulation and torpor in the Chilean mouse-opossum Thylamys elegans (Didelphidae)

In this paper we studied the energetic expenditure and thermoregulation of the Chilean mouse-opossum Thylamys elegans (Dielphidae) a nocturnal small marsupial, endemic of southern South America. We studied their standard energetic and determined whether they exhibit shallow daily torpor or deep prol...

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Autores principales:	Bozinovic,Francisco, RuÍz,Gricelda, CortÉs,Arturo, Rosenmann,Mario
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2005
Materias:	Chile marsupials energetic thermoregulation facultative torpor
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2005000200003
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spelling	oai:scielo:S0716-078X20050002000032014-08-12Energetics, thermoregulation and torpor in the Chilean mouse-opossum Thylamys elegans (Didelphidae)Bozinovic,FranciscoRuÍz,GriceldaCortÉs,ArturoRosenmann,Mario Chile marsupials energetic thermoregulation facultative torpor In this paper we studied the energetic expenditure and thermoregulation of the Chilean mouse-opossum Thylamys elegans (Dielphidae) a nocturnal small marsupial, endemic of southern South America. We studied their standard energetic and determined whether they exhibit shallow daily torpor or deep prolonged torpor as a function of ambient temperature and food availability. Thylamys elegans partially supports the hypothesis that Neotropical marsupials have somewhat a higher basal metabolic rate (BMR) and thermal conductance (Cm) than Australian ones. In fact, BMR was higher but Cm was lower than expected for their body mass. The higher mass-independent BMR of the Chilean mouse-opossum may be explained by its insectivorous food habits and its low Cm by its temperate habitats. Euthermic Chilean mouse-opossum showed daily fluctuations in body temperature being significantly higher during night time. In addition T. elegans entered in daily torpor and aroused spontaneously only was food was absent. That is, this species display a facultative type of daily torpor because propensity to enter in torpor was dependent of the combination of food absence and low ambient temperature. No torpor was observed when food was available. During torpor ambient temperature was slightly above ambient temperature between 0.3 to 0.5 °C. Torpor in this species as well as in marsupials in general, appears to be a flexible and an opportunistic response to unpredictable environmental conditionsinfo:eu-repo/semantics/openAccessSociedad de Biología de ChileRevista chilena de historia natural v.78 n.2 20052005-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2005000200003en10.4067/S0716-078X2005000200003
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Chile marsupials energetic thermoregulation facultative torpor
spellingShingle	Chile marsupials energetic thermoregulation facultative torpor Bozinovic,Francisco RuÍz,Gricelda CortÉs,Arturo Rosenmann,Mario Energetics, thermoregulation and torpor in the Chilean mouse-opossum Thylamys elegans (Didelphidae)
description	In this paper we studied the energetic expenditure and thermoregulation of the Chilean mouse-opossum Thylamys elegans (Dielphidae) a nocturnal small marsupial, endemic of southern South America. We studied their standard energetic and determined whether they exhibit shallow daily torpor or deep prolonged torpor as a function of ambient temperature and food availability. Thylamys elegans partially supports the hypothesis that Neotropical marsupials have somewhat a higher basal metabolic rate (BMR) and thermal conductance (Cm) than Australian ones. In fact, BMR was higher but Cm was lower than expected for their body mass. The higher mass-independent BMR of the Chilean mouse-opossum may be explained by its insectivorous food habits and its low Cm by its temperate habitats. Euthermic Chilean mouse-opossum showed daily fluctuations in body temperature being significantly higher during night time. In addition T. elegans entered in daily torpor and aroused spontaneously only was food was absent. That is, this species display a facultative type of daily torpor because propensity to enter in torpor was dependent of the combination of food absence and low ambient temperature. No torpor was observed when food was available. During torpor ambient temperature was slightly above ambient temperature between 0.3 to 0.5 °C. Torpor in this species as well as in marsupials in general, appears to be a flexible and an opportunistic response to unpredictable environmental conditions
author	Bozinovic,Francisco RuÍz,Gricelda CortÉs,Arturo Rosenmann,Mario
author_facet	Bozinovic,Francisco RuÍz,Gricelda CortÉs,Arturo Rosenmann,Mario
author_sort	Bozinovic,Francisco
title	Energetics, thermoregulation and torpor in the Chilean mouse-opossum Thylamys elegans (Didelphidae)
title_short	Energetics, thermoregulation and torpor in the Chilean mouse-opossum Thylamys elegans (Didelphidae)
title_full	Energetics, thermoregulation and torpor in the Chilean mouse-opossum Thylamys elegans (Didelphidae)
title_fullStr	Energetics, thermoregulation and torpor in the Chilean mouse-opossum Thylamys elegans (Didelphidae)
title_full_unstemmed	Energetics, thermoregulation and torpor in the Chilean mouse-opossum Thylamys elegans (Didelphidae)
title_sort	energetics, thermoregulation and torpor in the chilean mouse-opossum thylamys elegans (didelphidae)
publisher	Sociedad de Biología de Chile
publishDate	2005
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2005000200003
work_keys_str_mv	AT bozinovicfrancisco energeticsthermoregulationandtorporinthechileanmouseopossumthylamyselegansdidelphidae AT ruizgricelda energeticsthermoregulationandtorporinthechileanmouseopossumthylamyselegansdidelphidae AT cortesarturo energeticsthermoregulationandtorporinthechileanmouseopossumthylamyselegansdidelphidae AT rosenmannmario energeticsthermoregulationandtorporinthechileanmouseopossumthylamyselegansdidelphidae
_version_	1718439572568801280

Energetics, thermoregulation and torpor in the Chilean mouse-opossum Thylamys elegans (Didelphidae)

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