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Figure 2


Fig. 2. (A) Ventilatory rate measured as the beats per minute of respiratory appendages and (B) ventilatory amplitude measured as the mean maximal distance between the 4th and 5th appendages during five consecutive ventilatory strokes. Tadpole shrimp reared under normoxic (19–21 kPa O2; open circles), moderately hypoxic (10–13 kPa O2; gray circles) or severe hypoxic (1–3 kPa O2; black circles) conditions were exposed to four environmental PO2s (20, 13.3, 10 and 1 kPa O2). Values are means ± s.e.m. (N≥13). *Significant difference from control animals at same PO2 (P<0.05).