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Journal of Comparative Physiology B

, Volume 159, Issue 5, pp 561–567 | Cite as

The effect of ambient temperature on the relationship between ventilation and metabolism in a small parrot (Agapornis roseicollis)

  • Theresa L. Bucher
  • Kenneth R. Morgan
Article

Summary

Values for basal metabolism, standard tidal volume (VT), standard minute volume (\(\dot V_{\text{I}} \)), and mean extraction efficiency (EO2) in the thermal neutral zone (TNZ) inAgapornis roseicollis (1.84 ml·min−1; 0.95 ml·br−1, STPD; and 33.3 ml·min−1, STPD; and 22.5%; respectively) were all very similar to values for these parameters previously measured inBolborhynchus lineola, a similarly sized, closely related species from a distinctly different habitat.

Having both a lower critical temperature (Tlc) below and an upper critical temperature (Tuc) above those ofB. lineola, the TNZ ofA. roseicollis extended from 25° to at least 35°C. The thermal conductance below the TNZ ofA. roseicollis was 14% less than that ofB. lineola. Therefore, at 5°C the standard metabolic rate (SMR) of the former is 17% less than that of the latter, and at 35°C it is 20% less. At 5°CA. roseicollis has a lower EO2 and at 35°C a higher EO2 than that ofB. lineola. The patterns of resting energy metabolism and of ventilation ofA. roseicollis and ofB. lineola are consistent with the former species being better suited to living in a more variable thermal environment than the latter.

MeanVT has a weak positive correlation with the rate of oxygen consumption (\(\dot V{\text{O}}_{\text{2}} \)) at a constant ambient temperature (Ta) but a much stronger correlation when resting\(\dot V{\text{O}}_{\text{2}} \) increases in response to a decrease inTa.Vt is the only ventilatory parameter which is linearly correlated toTa from 35° to −25°C. The data suggest thatTa may have a regulatory effect onVT somewhat independent of\(\dot V{\text{O}}_{\text{2}} \) or\(\dot V_{\text{I}} \).

Key words

Ventilation Metabolism Parrots Respiration 

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Copyright information

© Springer-Verlag 1989

Authors and Affiliations

  • Theresa L. Bucher
    • 1
  • Kenneth R. Morgan
    • 1
  1. 1.Department of BiologyUniversity of California, RiversideRiversideUSA

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