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Economic thermoregulatory response explains mismatch between thermal physiology and behaviour in newts

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    0472998 - ÚBO 2018 RIV GB eng J - Článek v odborném periodiku
    Gvoždík, Lumír - Kristín, Peter
    Economic thermoregulatory response explains mismatch between thermal physiology and behaviour in newts.
    Journal of Experimental Biology. Roč. 220, č. 6 (2017), s. 1106-1111. ISSN 0022-0949. E-ISSN 1477-9145
    Grant CEP: GA ČR(CZ) GA15-07140S
    Institucionální podpora: RVO:68081766
    Klíčová slova: Aerobic scope * Amphibians * Preferred temperature * Specific dynamic action * Thermal niche * Thermoregulatory behaviour
    Obor OECD: Biology (theoretical, mathematical, thermal, cryobiology, biological rhythm), Evolutionary biology
    Impakt faktor: 3.179, rok: 2017

    Temperature is an important factor determining distribution and abundance of organisms. Predicting the impact of warming climate on ectotherm populations requires information about species' thermal requirements, so-called 'thermal niche'. The characterization of thermal niche remains a complicated task. We compared the applicability of two indirect approaches, based on reaction norm (aerobic scope curve) and optimality (preferred body temperature) concepts, for indirect estimation of thermal niche while using newts, Ichthyosaura alpestris, as a study system. If the two approaches are linked, then digesting newts should keep their body temperatures close to values maximizing aerobic scope for digestion. After feeding, newts maintained their body temperatures within a narrower range than did hungry individuals. The range of preferred body temperatures was well below the temperature maximizing aerobic scope for digestion. Optimal temperatures for factorial aerobic scope fell within the preferred body temperature range of digesting individuals. We conclude that digesting newts prefer body temperatures which are optimal for the maximum aerobic performance but relative to the maintenance costs. What might be termed the 'economic' thermoregulatory response explains the mismatch between thermal physiology and behaviour in this system.
    Trvalý link: http://hdl.handle.net/11104/0270175


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