Abstract
The effect of acute and chronic temperature change on oxygen uptake (V̇ O 2 ) and the respiratory properties of blood was determined in the newt, Taricha granulosa. Acclimation to 20–24°C for 4 weeks caused a significant increase in hemoglobin concentration (6.5–9.5 g/dl) and O 2 capacity of blood but no change in oxygen affinity compared with animals acclimated to 4–6°C. Cold acclimated animals had a reverse Bohr effect compared with warm acclimated animals ( dlogP 50/dpH = +0.13 and −0.12 , respectively) but the present data offer no mechanism. There was no difference between the two acclimation groups with respect to temperature sensitivity of O 2 binding, cooperativity of binding, buffer capacity, red cell organic phosphate concentration, or red cell dimensions. There was no evidence for thermal acclimation of V̇ O 2 . Over the seasonal range of water temperature experienced by this species (5–25°C), the major adaptation to the ca. 4 fold increase in V̇ O 2 is a 49% increase in blood O 2 capacity.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
