Vampire blood: respiratory physiology of the vampire squid (Cephalopoda: Vampyromorpha) in relation to the oxygen minimum layer |
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| Authors: | Brad A Seibel Fabienne Chausson Francois H Lallier Franck Zal and James J Childress |
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| Institution: | (1) Marine Science Institute and Department of Ecology, Evolution and Marine Biology, University of California, Santa Barbara, CA 93106, USA;(2) Equipe Ecophysiologie, Observatoire Océanologique de Roscoff, UPMC – CNRS-INSU, Station Biologique, BP 74, Roscoff Cedex, F-29682, France |
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| Abstract: | The functional properties of the haemocyanin ofVampyroteuthis infernalis (Cephalopoda: Vampyromorpha), measured at 5 °C, are reported and discussed in relation to hypoxia. The oxygen affinity of this haemocyanin (P50=0.47−0.55 kPa) is higher than any previously measured for a cephalopod. The high cooperativity (n50=2.20−2.23) and Bohr coefficient (−0.22) suggest a true transport function for this haemocyanin. This high-affinity haemocyanin, in conjunction with moderate gill diffusion capacity, provides a sufficient oxygen gradient from the environment to the blood to support the low routine oxygen consumption rate of V. infernalis |
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| Keywords: | Deep sea Haemocyanin Hypoxia |
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