. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. S. HOLIRDEZ ET AL. 100 A Benthoxynus spiculifer 1/1000T. o 0? B 30°C * 10°C • en E 2 - 2 o IO 1 _ i^fs *' ' — •\ c O 0 • i i i i i i i , i , i i i i . i 0 PH o 10 PO2 (mmHg) Figure 3. (A) Oxygen equilibrium curves of Benthoxynus spiculifer hemoglobin at 10°. 20°, and 30°C, measured as previously described (5), and (inset) arrhenius plot showing calculated values of the apparent oxygenation enthalpy values (AH). (B) Variation of P5n and n,n values with pH and tem
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. S. HOLIRDEZ ET AL. 100 A Benthoxynus spiculifer 1/1000T. o 0? B 30°C * 10°C • en E 2 - 2 o IO 1 _ i^fs *' ' — •\ c O 0 • i i i i i i i , i , i i i i . i 0 PH o 10 PO2 (mmHg) Figure 3. (A) Oxygen equilibrium curves of Benthoxynus spiculifer hemoglobin at 10°. 20°, and 30°C, measured as previously described (5), and (inset) arrhenius plot showing calculated values of the apparent oxygenation enthalpy values (AH). (B) Variation of P5n and n,n values with pH and temperature. apparent, and the very high affinity of the hemoglobin in B. spiculifer probably also reflects the very low oxygen ten- sions this species experiences in its hydrothermal vent mi- crohabitat. In this context it is relevant that hemoglobins or hemocyanins with high oxygen affinity characterize many hydrothermal vent animals (10). Acknowledgments We thank the captains, pilots, and crews of the R/V Atlantis and DSRV Alvin for their assistance at sea; Verena Tunnicliffe and Maia Tsurumi for identifying B. spiculifer. Anny Bang for assistance with the oxygen equilibrium experiments; and Veronique Robigou and the REVEL Project for providing science teachers with research oppor- tunities. This project was supported by NSF OCE 9633105 and the REVEL Program (NSF OCE-9814073 to Delaney, with additional support from the Pennsylvania State University and the American Museum of Natural History). Literature Cited 1. Sarradin, P. M., J. C. Caprais, P. Briand, F. Gaill, B. Shillito, and D. Desbruyeres. 1998. Chemical and thermal description of the environment of the Genesis hydrothermal vent community (13 degrees N. EPR). Cah. Biol. Mar. 39(2): 159-167. 2. Fox, H. M. 1957. Haemoglobin in the Crustacea. Nature 179: 148. 3. Humes. A. G. 1994. How many copepods? Hydrobiologia 293: 1-7. 4 Sarrazin, J., V. Robigou, S. K. Juniper, and J. R. Delaney. 1997. Biological and g
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