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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).