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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

View larger version (20K): [in a new window]   Fig. 2. (A) A recording of falling [O2] in the closed respirometer. (B) The graph is derived from A and shows the O2 consumption at different levels of ambient [O2]. Variables derived from the measurements of O2 consumption in G. histrio are indicated in A and B. O2 is the normoxic O2 consumption, and [O2]crit is the critical O2 concentration (below which the animal loses the ability to regulate its O2 consumption). (C) The ventilatory frequency at different O2 concentrations measured during respirometry (means ± S.E.M. of 11 individuals of both forms of G. histrio). A and B are from a typical animal, and the variables measured from several animals are given in Table 1. *P<0.05 compared with any of the 70%, 80% and 90% values (Dunn's test).

View larger version (47K): [in a new window]   Fig. 1. Oxygen level (A) outside and (B) between branches of Acropora nasuta colonies from dusk to dawn. Values are means ± S.E.M. from six measurements on three corals. Sunset and sunrise are indicated by broken lines.

View larger version (18K): [in a new window]   Fig. 3. (A) Oxygen consumption and (B) ventilatory frequency in G. histrio during air exposure. Both parameters were measured over 30 min periods, as indicated by the horizontal bars. Values are means ± S.E.M. from five animals.

View larger version (14K): [in a new window]   Fig. 4. Oxygen debt after air exposure in G. histrio. The values are O2 consumption (O2) in water measured during 1 h periods immediately after exposure to air for 2 h. Means ± S.E.M. of six fish. The broken line shows the mean O2 previously measured in 11 individuals not exposed to air (from Table 1). *P<0.001 compared with the 3–4 h, 4–5 h and 5–6 h values.