Thermogenic Capacity of Greenfinches and Siskins in Winter and Summer

  • Seppo Saarela
  • Bernt Klapper
  • Gerhard Heldmaier
Part of the NATO ASI Series book series (ASIAS, volume 173)


The maintenance of thermal balance and high body temperature (Tb) during cold exposure of birds requires the improvement of thermal insulation and the increase of heat production (HP). Strategies for responding to low ambient temperature (Ta) are dependent on the body size. Large birds like the black grouse (Lyrurus tetrix, body mass about 1 kg) and the capercaillie (Tetrao urogallus, body mass 2–5 kg) compensate for increased cold load mainly by improvement of thermal insulation (Rintamäki et al., 1983; Hissa et al., 1983). The small body size of finches minimizes the significance of thermal insulation. The maintenance of high Tb in the ccld is thus mainly dependent on the efficiency of HP.


Thermal Insulation Cold Tolerance Basal Metabolic Rate House Sparrow Black Grouse 


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Copyright information

© Springer Science+Business Media New York 1989

Authors and Affiliations

  • Seppo Saarela
    • 1
  • Bernt Klapper
    • 2
  • Gerhard Heldmaier
    • 2
  1. 1.Department of ZoologyUniversity of OuluOuluFinland
  2. 2.Fachbereich BiologiePhilipps-UniversitätMarburgFederal Republic of Germany

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