Zusammenfassung
Während einer Hungerperiode von 70 Stunden wurde von 6 Amseln bei — 10°C Umgebungstemperatur der Sauerstoffverbrauch, die Kohlendioxydproduktion und die Körpertemperatur gemessen.
Mit fortschreitendem Gewichtsverlust trat während der Nächte schwach ausgebildete Hypothermie auf. Gleichzeitig sank auch der Stoffwechsel, was nach 4 Tagen ohne Futter eine Energieersparnis von 102 J bedeutet oder eine um 20 Nachtstunden verlängerte Überlebensdauer.
Ein Absinken des Q10-Wertes für den Stoffwechsel während der Versuchszeit wird durch das ungünstigere Volumen-Oberflächenverhältnis leichterer Amseln und eine damit verbundene Stoffwechselerhöhung erklärt.
Summary
6 blackbirds were kept without food for 70 hours at an ambient temperature of — 10°C; body temperature, oxygen consumption and carbon dioxide production were continously recorded.
With decreasing body weight a minor degree of hypothenmy set in during the night with a simultaneous decrease in the metabolic rate. Under natural conditions this might have resulted in a saving of 102 J, the energetic requirement of a blackbird during a 20 hour night.
A decrease in the Q10-value of the metabolic rate during the study period is explained by a steady decline in the bodyvolume — surface ratio resulting in an increased metabolic rate.
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Biebach, H. Reduktion des Energiestoffwechsels und der Körpertemperatur hungernder Amseln(Turdus merula) . J Ornithol 118, 294–300 (1977). https://doi.org/10.1007/BF01643539
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DOI: https://doi.org/10.1007/BF01643539