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Figure 4


Fig. 4. Temporal profile of water PO2 of O. lacepedii burrows (filled circles). Each filled circle corresponds to an individual burrow. Data for burrow-water PO2 were fitted to the exponential decrease equation (y=2.48+4.87e–2.02x; r2=0.73, P<0.0001). The PO2 of free water over the mudflat during high tide is represented by the open circle with vertical line (mean ± s.d.; N=6). The arrow indicates the onset (1.3 h) of air breathing.