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Poikilothermic traits in Mashona mole-rat (Fukomys darlingi). Reality or myth?

  1. 1.
    0481507 - BC 2018 RIV GB eng J - Článek v odborném periodiku
    Zemanová, Milada - Šumbera, R. - Okrouhlík, J.
    Poikilothermic traits in Mashona mole-rat (Fukomys darlingi). Reality or myth?
    Journal of Thermal Biology. Roč. 37, č. 7 (2012), s. 485-489. ISSN 0306-4565. E-ISSN 1879-0992
    Institucionální podpora: RVO:60077344
    Klíčová slova: subterranean rodent * Bathyergidae * poikilothermy
    Obor OECD: Biology (theoretical, mathematical, thermal, cryobiology, biological rhythm), Evolutionary biology
    Impakt faktor: 1.376, rok: 2012
    http://www.sciencedirect.com/science/article/pii/S0306456512000824

    The African mole-rats (Bathyergidae, Rodentia) is a mammalian family well known for a variety of ecophysiological adaptations for strictly belowground life. The smallest bathyergid, the hairless naked mole-rat from arid areas in Eastern Africa, is even famous as the only truly poikilothermic mammal. Another bathyergid, the Mashona mole-rat (Fukomys darlingi) from Zimbabwe, is supposed to have strong poikilothermic traits, because it is not able to maintain a stable body temperature at ambient temperatures below 20 degrees C. This is surprising because, compared to the naked mole-rat, this species, together with all congenerics, is larger, haired, and living in more seasonal environment. In addition, other Fukomys mole-rats show typical mammalian pattern in resting metabolic rates. In our study, we measured resting metabolic rate and body temperature of Mashona mole-rats from Malawi across a gradient of ambient temperatures to test its poikilothermic traits. We found that the adult mass specific resting metabolic rate was 0.76 +/- 0.20 ml O-2 g(-1) h(-1) body temperature 34.8 +/- 1.1 degrees C in the thermoneutral zone (27-34 degrees C). Body temperature was stable (33.0 +/- 0.5 degrees C) at ambient temperatures from 10 to 25 degrees C. We thus cannot confirm poikilothermic traits in this species, at least for its Malawian population. Factors potentially explaining the observed discrepancy in Mashona mole-rat energetics are discussed. (C) 2012 Elsevier Ltd. All rights reserved.
    Trvalý link: http://hdl.handle.net/11104/0277307

     
     
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