Thermal equilibrium and temperature differences among body regions in European plethodontid salamanders.
Identifieur interne : 000066 ( Main/Exploration ); précédent : 000065; suivant : 000067Thermal equilibrium and temperature differences among body regions in European plethodontid salamanders.
Auteurs : Enrico Lunghi [Italie] ; Raoul Manenti [Italie] ; Giancarlo Canciani [Italie] ; Giorgio Scarì [Italie] ; Roberta Pennati [Italie] ; Gentile Francesco Ficetola [France]Source :
- Journal of thermal biology [ 0306-4565 ] ; 2016.
Abstract
Information on species thermal physiology is extremely important to understand species responses to environmental heterogeneity and changes. Thermography is an emerging technology that allows high resolution and accurate measurement of body temperature, but until now it has not been used to study thermal physiology of amphibians in the wild. Hydromantes terrestrial salamanders are strongly depending on ambient temperature for their activity and gas exchanges, but information on their body temperature is extremely limited. In this study we tested if Hydromantes salamanders are thermoconform, we assessed whether there are temperature differences among body regions, and evaluated the time required to reach the thermal equilibrium. During summers of 2014 and 2015 we analysed 56 salamanders (Hydromantes ambrosii and Hydromantes italicus) using infrared thermocamera. We photographed salamanders at the moment in which we found them and 1, 2, 3, 4, 5 and 15min after having kept them in the hands. Body temperature was equal to air temperature; salamanders attained the equilibrium with air temperature in about 8min, the time required to reach equilibrium was longer in individuals with large body size. We detected small temperature differences between body parts, the head being slightly warmer than the body and the tail (mean difference: 0.05°C). These salamanders quickly reach the equilibrium with the environment, thus microhabitat measurement allows obtaining accurate information on their tolerance limits.
DOI: 10.1016/j.jtherbio.2016.06.010
PubMed: 27503719
Affiliations:
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Natural Oasis, Via di Galceti 141, 59100 Prato, Italy; Museo di Storia Naturale dell'Università di Firenze, Sezione di Zoologia "La Specola", Via Romana 17, 50125 Firenze, Italy. 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Thermography is an emerging technology that allows high resolution and accurate measurement of body temperature, but until now it has not been used to study thermal physiology of amphibians in the wild. Hydromantes terrestrial salamanders are strongly depending on ambient temperature for their activity and gas exchanges, but information on their body temperature is extremely limited. In this study we tested if Hydromantes salamanders are thermoconform, we assessed whether there are temperature differences among body regions, and evaluated the time required to reach the thermal equilibrium. During summers of 2014 and 2015 we analysed 56 salamanders (Hydromantes ambrosii and Hydromantes italicus) using infrared thermocamera. We photographed salamanders at the moment in which we found them and 1, 2, 3, 4, 5 and 15min after having kept them in the hands. Body temperature was equal to air temperature; salamanders attained the equilibrium with air temperature in about 8min, the time required to reach equilibrium was longer in individuals with large body size. We detected small temperature differences between body parts, the head being slightly warmer than the body and the tail (mean difference: 0.05°C). These salamanders quickly reach the equilibrium with the environment, thus microhabitat measurement allows obtaining accurate information on their tolerance limits.</div></front></TEI><affiliations><list><country><li>France</li><li>Italie</li></country><region><li>Auvergne-Rhône-Alpes</li><li>Rhône-Alpes</li></region><settlement><li>Grenoble</li></settlement><orgName><li>Université Grenoble-Alpes</li></orgName></list><tree><country name="Italie"><noRegion><name sortKey="Lunghi, Enrico" sort="Lunghi, Enrico" uniqKey="Lunghi E" first="Enrico" last="Lunghi">Enrico Lunghi</name></noRegion><name sortKey="Canciani, Giancarlo" sort="Canciani, Giancarlo" uniqKey="Canciani G" first="Giancarlo" last="Canciani">Giancarlo Canciani</name><name sortKey="Manenti, Raoul" sort="Manenti, Raoul" uniqKey="Manenti R" first="Raoul" last="Manenti">Raoul Manenti</name><name sortKey="Pennati, Roberta" sort="Pennati, Roberta" uniqKey="Pennati R" first="Roberta" last="Pennati">Roberta Pennati</name><name sortKey="Scari, Giorgio" sort="Scari, Giorgio" uniqKey="Scari G" first="Giorgio" last="Scarì">Giorgio Scarì</name></country><country name="France"><region name="Auvergne-Rhône-Alpes"><name sortKey="Ficetola, Gentile Francesco" sort="Ficetola, Gentile Francesco" uniqKey="Ficetola G" first="Gentile Francesco" last="Ficetola">Gentile Francesco Ficetola</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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