Table 4.

Mean gas-exchange phase durations (min) and CO2 emission volumes (μl) determined with NAN respirometry for Cormocephalus moristans at 15 and 20 °C

C-phaseF-phaseO-phase
Normoxic—anoxic—normoxic (NAN) respirometry at 15 °C     
Normal DGC Phase duration 10.62±5.00 38.06±7.50 11.69±0.54 
 Emission volume 0.553±0.226 4.000±0.653 20.895±3.323 
NAN respirometry Phase duration 8.00±1.10 — 4.76±0.64 
 Emission volume 0.562±0.154 — 12.137±1.358 
Post-NAN DGC Phase duration 6.17±1.07 66.48±6.26 12.38±1.86 
 Emission volume 0.222±0.038 5.647±1.028 22.309±5.229 
NAN respirometry at 20 °C     
Normal DGC Phase duration 3.95±2.88 20.11±3.79 8.35±1.25 
 Emission volume 0.182±0.122 3.159±0.551 18.528±4.066 
NAN respirometry Phase duration 1.79±1.228 — 5.157±0.74 
 Emission volume 0.092±0.040 — 11.748±1.751 
Post-NAN DGC Phase duration 1.76±1.11 20.66±2.55 8.6±1.02 
 Emission volume 0.067±0.030 3.061±0.549 11.366±5.191 
Values are means±S.E.M. (N=3).     
C-phaseF-phaseO-phase
Normoxic—anoxic—normoxic (NAN) respirometry at 15 °C     
Normal DGC Phase duration 10.62±5.00 38.06±7.50 11.69±0.54 
 Emission volume 0.553±0.226 4.000±0.653 20.895±3.323 
NAN respirometry Phase duration 8.00±1.10 — 4.76±0.64 
 Emission volume 0.562±0.154 — 12.137±1.358 
Post-NAN DGC Phase duration 6.17±1.07 66.48±6.26 12.38±1.86 
 Emission volume 0.222±0.038 5.647±1.028 22.309±5.229 
NAN respirometry at 20 °C     
Normal DGC Phase duration 3.95±2.88 20.11±3.79 8.35±1.25 
 Emission volume 0.182±0.122 3.159±0.551 18.528±4.066 
NAN respirometry Phase duration 1.79±1.228 — 5.157±0.74 
 Emission volume 0.092±0.040 — 11.748±1.751 
Post-NAN DGC Phase duration 1.76±1.11 20.66±2.55 8.6±1.02 
 Emission volume 0.067±0.030 3.061±0.549 11.366±5.191 
Values are means±S.E.M. (N=3).     

DGC, discontinuous gas exchange; C, closed phase; F, flutter phase; O, open phase.

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