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Table 1.

Characterisation of ventilatory and cardiac activity

Bout
Bout
NNumber (h-1)Mean duration (min)Hourly duration (%)fr (min-1)fh (min-1)Apnea (%)Number (h-1)Mean duration (min)Hourly duration (%)fr (min-1)fh (min-1)Apnea (%)
Myodocopids  21 kPa
 
     4 kPa
 
     
C. mariae 3±1 31±8 88±7 93±3 42±4 3±1 36±9 90±7 72±10 46±2 
P*  0.73* 0.88* 0.88* 0.94* 
Podocopids  21 kPa
 
     3 kPa
 
     
Five species 31 9±2 18±6 61±5 55±10 26 8±4 30±12 69±13 48±11 42 
P  0.03 0.01 0.03 0.02 0.01 0.67 0.10 0.03 
Bout
Bout
NNumber (h-1)Mean duration (min)Hourly duration (%)fr (min-1)fh (min-1)Apnea (%)Number (h-1)Mean duration (min)Hourly duration (%)fr (min-1)fh (min-1)Apnea (%)
Myodocopids  21 kPa
 
     4 kPa
 
     
C. mariae 3±1 31±8 88±7 93±3 42±4 3±1 36±9 90±7 72±10 46±2 
P*  0.73* 0.88* 0.88* 0.94* 
Podocopids  21 kPa
 
     3 kPa
 
     
Five species 31 9±2 18±6 61±5 55±10 26 8±4 30±12 69±13 48±11 42 
P  0.03 0.01 0.03 0.02 0.01 0.67 0.10 0.03 

Characterisation of ventilatory and cardiac activity during a 3 day exposure period at water PO2=21 and 3 or 4 kPa in the myodocopid ostracod Cylindroleberis mariae (upper) and comparison with podocopid ostracods (lower; from Corbari et al., 2004). Note the absence of significant respiratory adaptation under hypoxia in both ostracod groups (see text for other details). Number, number of ventilatory bouts per hour; mean duration, mean bout duration per hour; hourly duration, total duration of active ventilation per hour; fr, respiratory frequency within bouts; fh, cardiac frequency. Apnea,percentage of animals presenting a total absence of ventilatory activity during the 1 h studied period. All data expressed as mean ± 1 s.e.m., N=number of studied animals. P*, P values for comparisons between hypoxia and normoxia in C. mariae; P, P values for comparisons between normoxic- and hypoxic-respiratory activities in podocopid ostracods and C. mariae(myodocopid ostracod).

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