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Figure 2


Fig. 2. Relationship between PO2 and PCO2 of Periophthalmus modestus egg-chamber air determined for burrows with egg-guarding males (solid circles) and courting males (open circles). Regression equations are PCO2=2.62–0.11PO2 (r=–0.577, N=20, P=0.008) for burrows with guarding males, and PCO2=1.53–0.05PO2 (r=–0.678, N=12, P=0.015) for burrows with courting males. Slopes are not significantly different from each other (ANCOVA, P=0.141).