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First published online November 24, 2003
Journal of Experimental Biology 207, 33-39 (2004)
Published by The Company of Biologists 2004
doi: 10.1242/jeb.00713

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Coward or braveheart: extreme habitat fidelity through hypoxia tolerance in a coral-dwelling goby

Göran E. Nilsson^1,*, Jean-Paul Hobbs², Philip L. Munday² and Sara Östlund-Nilsson¹

¹ Department of Biology, University of Oslo, PO Box 1051 Oslo, Norway
² School of Marine Biology and Aquaculture, James Cook University, Townsville, Australia

^* Author for correspondence (e-mail: g.e.nilsson{at}bio.uio.no)

Accepted 9 September 2003

Coral reef fishes are not known for their hypoxia tolerance. The coral-dwelling goby, Gobiodon histrio, rarely leaves the shelter of its host coral colony. However, our measurements indicate that this habitat could become hypoxic on calm nights ([O₂] minima=2–30% of air saturation) due to respiration by the coral and associated organisms. Moreover, at very low tides, the whole coral colony can be completely air exposed. Using closed respirometry in water, we found that G. histrio maintains O₂ uptake down to 18% of air saturation, and that it can tolerate at least 2 h at even lower O₂ levels. Furthermore, during air exposure, which was tolerated for more than 3 h, it upheld a rate of O₂ consumption that was 60% of that in water. The hypoxia tolerance and air breathing abilities enables this fish to stay in the safety of its coral home even when exposed to severe hypoxia or air. To our knowledge, this is the first report of hypoxia tolerance in a teleost fish intimately associated with coral reefs.

Key words: hypoxia, Gobiidae, air breathing, Great Barrier Reef, Gobiodon histrio

This article has been cited by other articles:

				G. E. Nilsson, J.-P. A. Hobbs, and S. Ostlund-Nilsson Tribute to P. L. Lutz: respiratory ecophysiology of coral-reef teleosts J. Exp. Biol., May 15, 2007; 210(10): 1673 - 1686. [Abstract] [Full Text] [PDF]