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Fig. 3. Ventilatory response of Cyprideis torosa to consecutive 3-day
exposure periods at reference water PO2=21 kPa,
hypoxia, PO2=3 kPa, and recovery
PO2=21 kPa. See text for details. (A,B) Typical
ventilatory pattern (fR, ventilatory frequency) in two
specimens of Cyprideis during 1 h observation periods at
PO2=21 kPa. Both activities are contrasted and
characterized by alternations of ventilatory bursts and pauses. (C–E)
Ventilatory activity per hour (C; min h–1), burst number per
hour (D; h–1), mean ventilatory frequency within burst per
minute (E; fR, min–1) at
PO2=21 and 3 kPa (grey-shaded). Each data point
(mean ± 1 S.D.) was obtained from a single podocopids,
randomly chosen and analysed during the 1 h period. The ventilatory frequency
within burst was also analysed during a 3-day recovery period (days 7 and 9)
at PO2=21 kPa (E). One symbol per individual,
N=10 animals. No significant change was observed as a function of
water PO2 and time.
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