. | PO2 (kPa) . | . | . | [O2] (mmol l-1) . | . | . | % Hc O2 saturation . | . | . | ||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
. | Pulmonary . | Arterial . | Venous . | Pulmonary . | Arterial . | Venous . | Pulmonary . | Arterial . | Venous . | ||||||
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 . | . | . | ||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
. | Pulmonary . | Arterial . | Venous . | Pulmonary . | Arterial . | Venous . | Pulmonary . | Arterial . | Venous . | ||||||
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 . | . | . | ||||
---|---|---|---|---|---|---|---|---|---|---|
. | Pulmonary . | Arterial . | Venous . | Pulmonary . | Arterial . | Venous . | ||||
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 . | . | . | ||||
---|---|---|---|---|---|---|---|---|---|---|
. | Pulmonary . | Arterial . | Venous . | Pulmonary . | Arterial . | Venous . | ||||
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