Journal of comparative physiology

, Volume 129, Issue 2, pp 97–103 | Cite as

Reversed bohr and root shifts in hemocyanin of the marine prosobranch,Buccinum undatum: Adaptations to a periodically hypoxic habitat

  • Ole Brix
  • Gunnar Lykkeboe
  • Kjell Johansen
Article

Summary

Oxygen binding properties of the hemocyanin-containing blood ofBuccinum undatum were examined in vitro and in vivo under normoxic (\(P_{W,O_2 } \)≈150 mmHg) and hypoxic (\(P_{W,O_2 } \)≦50 mmHg) conditions at 10°C. Blood pH and\(P_{O_2 } \) showed a decrease in vivo under hypoxic conditions. Oxygen uptake at high water\(P_{O_2 } \), was about 18 ml O2/kg·h (wet weight) and the critical oxygen tension between 25 and 50 mm Hg. In vitro the O2 binding to hemocyanin showedn-values independent of pH, while both O2 affinity and oxygen carrying capacity were strongly pH dependent. Oxygen affinity increased below pH=8.1 and thus showed a pronounced reversed Bohr shift in the physiological pH range (7.5<pH<8.1). The oxygen carrying capacity similarly increased markedly with falling pH in the physiological pH range (reversed Root shift). Astrup titration curves showed a metabolic and respiratory acidosis under hypoxic conditions (\(P_{W,O_2 } \)≦50 mm Hg). The role of hemocyanin in the transport of oxygen in relation to ambient O2 availability is discussed.

Keywords

Oxygen Titration Oxygen Uptake Hypoxic Condition Oxygen Tension 

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Copyright information

© Springer-Verlag 1979

Authors and Affiliations

  • Ole Brix
    • 1
  • Gunnar Lykkeboe
    • 1
  • Kjell Johansen
    • 1
  1. 1.Department of ZoophysiologyUniversity of AarhusAarhus CDenmark

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