Fig. 4. Intragel oxygen measurements of unharnessed specimens of Aurelia labiata under different oxygen conditions. Values are means ± S.E.M. White, black and shaded bars represent measurements made in points t, m and g, respectively (see Fig. 1). Hypoxia=30% air saturation. Anoxia1 and Anoxia2, 1 and 2 h in anoxia, respectively. Recovery, 2 h in anoxia followed by 2.5 h in normoxia. All differences in intragel oxygen partial pressures between treatments are significant, except that and are not significantly different from each other. For N and P values, see text.