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Table 3.

Haemolymph respiratory and acid–base status of Discoplax hirtipes sampled on Christmas Island during June (dry season) or February(wet season)

PO2 (kPa)
[O2] (mmol l-1)
% Hc O2 saturation
PulmonaryArterialVenousPulmonaryArterialVenousPulmonaryArterialVenous
June – FR 12.00±2.79 10.26±2.69 0.89±0.05a,p 0.92±0.09 0.86±0.13 0.36±0.08a,p 100.9±8.6 92.2±11.3 44.9±9.5a,p 
June – exercised 6.51±1.84 5.44±1.83 1.76±0.24,p 1.10±0.13 1.01±0.15 0.33±0.04a,p 99.3±11.5 89.4±7.3 29.7±2.3,a,p 
February – FR 5.75±1.65* 3.93±1.55* 0.73±0.08a,p 1.00±0.15 0.91±0.08 0.36±0.07a,p 105.3±3.0 101.0±7.1 39.4±4.0a,p 
Feb – exercised 5.32±0.80 4.10±0.61 0.96±0.23*,a,p 0.66±0.04*, 0.68±0.03*, 0.26±0.05a,p 95.3±11.5 99.2±10.7 41.2±11.4a,p 
PO2 (kPa)
[O2] (mmol l-1)
% Hc O2 saturation
PulmonaryArterialVenousPulmonaryArterialVenousPulmonaryArterialVenous
June – FR 12.00±2.79 10.26±2.69 0.89±0.05a,p 0.92±0.09 0.86±0.13 0.36±0.08a,p 100.9±8.6 92.2±11.3 44.9±9.5a,p 
June – exercised 6.51±1.84 5.44±1.83 1.76±0.24,p 1.10±0.13 1.01±0.15 0.33±0.04a,p 99.3±11.5 89.4±7.3 29.7±2.3,a,p 
February – FR 5.75±1.65* 3.93±1.55* 0.73±0.08a,p 1.00±0.15 0.91±0.08 0.36±0.07a,p 105.3±3.0 101.0±7.1 39.4±4.0a,p 
Feb – exercised 5.32±0.80 4.10±0.61 0.96±0.23*,a,p 0.66±0.04*, 0.68±0.03*, 0.26±0.05a,p 95.3±11.5 99.2±10.7 41.2±11.4a,p 
[CO2] (mmol l-1)
pH
PulmonaryArterialVenousPulmonaryArterialVenous
June – FR 15.17±1.88 16.26±1.57 16.70±0.90 7.60±0.03 7.62±0.02 7.60±0.03 
June – exercised 14.64±1.21 15.25±1.33 16.60±1.02 7.30±0.07 7.31±0.08 7.26±0.08 
February – FR 17.34±1.82 16.14±1.81 17.28±1.86 7.46±0.02* 7.48±0.03* 7.45±0.03* 
Feb – exercised 11.02±0.66*, 11.18±0.82*, 11.38±0.57*, 7.09±0.07*, 7.11±0.07*, 6.99±0.04*, 
[CO2] (mmol l-1)
pH
PulmonaryArterialVenousPulmonaryArterialVenous
June – FR 15.17±1.88 16.26±1.57 16.70±0.90 7.60±0.03 7.62±0.02 7.60±0.03 
June – exercised 14.64±1.21 15.25±1.33 16.60±1.02 7.30±0.07 7.31±0.08 7.26±0.08 
February – FR 17.34±1.82 16.14±1.81 17.28±1.86 7.46±0.02* 7.48±0.03* 7.45±0.03* 
Feb – exercised 11.02±0.66*, 11.18±0.82*, 11.38±0.57*, 7.09±0.07*, 7.11±0.07*, 6.99±0.04*, 

Pulmonary, arterial and venous haemolymph samples were taken from free-ranging crabs (FR) or crabs exercised for 5 min. There were no differences between pulmonary and arterial haemolymph in any of the parameters measured. Significant differences between venous and arterial samples are indicated by an `a', while differences between venous and pulmonary are indicated by a `p' above the venous sample for each treatment group.

indicates a significant difference between FR and exercised crabs within each season (June or February)

*

indicates a significant difference between seasons (June vsFebruary) for either exercised crabs or for rested crabs. Differences between treatments were assessed by parametric analysis (ANOVA) with post-hoctesting (Tukey's HSD pair-wise comparison), while differences within treatments (i.e. haemolymph type) were assessed using Friedman's two-factor ANOVA for related samples, a non-parametric equivalent to one-factor ANOVA. N=8 for each treatment; total N=64

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