Fig. 4. C. mariae ventilatory and cardiac responses to 2-16 h exposure periods at various oxygenation levels. Upper panels: respiratory frequencies within bouts, fR (min^-1) and cardiac frequencies, fH (min^-1) illustrating inter-individual variability. One symbol per oxygenation level and N=12 animals per studied level. Lower panels, mean fR and fH relationship versus water P_O2 (±1M.E.M.). No significant trend was observed as a function of P_O2. Italics refer to the protocol shown in Fig. 1C.