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Heat tolerance of monotremes

Authors
Journal
Journal of Thermal Biology
0306-4565
Publisher
Elsevier
Publication Date
Volume
1
Issue
3
Identifiers
DOI: 10.1016/0306-4565(76)90011-5
Keywords
  • Echidna
  • Metabolic Rate
  • Monotreme
  • Oxygen Consumption
  • Platypus
  • Respiration
  • Sweat
  • Temperature Regulation

Abstract

Abstract 1. 1.|Echidnas do not sweat, pant, or lick in response to high ambient temperature ( T a ) Platypus produce copious sweat, presumably under adrenergic control. 2. 2.|At a thermoneutral T a (25°C) echidna body temperature ( T b ) is 32.2 C. When T a rises above this level, T b invariably rises, and T b levels above 38°C are generally lethal. 3. 3.|At normal T b 32°C the oxygen consumption of echidnas is about 33% of that predicted for eutherian mammals. When echidna T b is experimentally raised to eutherian level (38°C), the oxygen consumption is 70% of that predicted for eutherian mammals.

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