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  • 1
    Electronic Resource
    Electronic Resource
    O2-uptake, thermoregulation and heart rate in the springhare (Pedetes capensis) (1979)
    Springer
    Journal of comparative physiology 133 (1979), S. 187-191 
    Details
    ISSN: 1432-136X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary 1. O2-consumption (O2), rectal temperature (T re) and heart rate were measured in two adult springhares (♂,♀; body mass 2.2–2.4 kg) at ambient temperatures (T a) from 6–35 °C. Abdominal temperature in the female and heart rate in both animals were determined by telemetry. 2. AtT a's from 23–28 °C rectal temperature in both animals ranged between 35.5–36.3 °C. This range was well maintained at lowT a's. Exposure to highT a's, however, led to a considerable rise of the rectal temperature (to above 39 °C atT a=35 °C). 3. The lowest oxygen uptake (0.32–0.37 ml O2·g−1·h−1) was found between 23–33 °C. This is only 65–75% of the predicted value in similar sized mammals. Below 23 °C O2-consumption increased rapidly up to approximately 2,5 times (6–7 °C) the value in the thermoneutral zone (23–33 °C). AtT a's above 33 °C the heat dissipating capacities of the springhares proved to be inadequate and consequentlyT re rose steadily. 4. Basal heart rate (75–85 beats·min−1) was about 30% below the standard value for similar sized mammals. During exposure to cold the heart rate sometimes exceeded 200 beats·min−1. 5. The measured parameters are discussed with special regard to the extent of the springhare's adaptation to arid conditions. It is concluded that these rodents are physiologically adapted to fossorial habits rather than to life in desert environments and are thus restricted to semi-arid areas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00691464
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  • 2
    Electronic Resource
    Electronic Resource
    Changes in thyroxine, triiodothyronine and metabolic rate in the dik-dik antelope (Rhynchotragus kirkii): effects of temperature and dehydration (1983)
    Springer
    Journal of comparative physiology 152 (1983), S. 23-26 
    Details
    ISSN: 1432-136X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary 1. Changes in plasma total thyroxine, triiodothyronine (T3) and metabolic rate were investigated in both hydrated and dehydrated dik-diks after prolonged exposure to ambient temperatures (T a) of 25°C, 35°C and 15°C. 2. AtT a of 25°C, metabolic rate, T3 and T4 were 2.58 W·kg−1, 56.3 ng ml−1 and 0.93 ng ml−1 for the hydrated group, and 1.95 W·kg−1, 70.0 ng ml−1 and 0.85 ng ml−1 for the dehydrated group, respectively. 3. Exposure to 15°C increased metabolic rate and total hormonal concentrations in both groups. 4. Following dehydration and exposure toT a of 35°C a significant decrease in metabolic rate occurred in the presence of a significant increase in both T3 and T4 concentrations. 5. Levels of total plasma T3 and T4 alone are unlikely to be responsible for the decrease in metabolic rate observed in the dehydrated dik-dik antelopes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00689723
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