Table 2.

Seasonal changes in the metabolic profile of Rana catesbeiana at 15°C

Treatment
ParameterTissueSeasonRESTPEREC 4
pHBloodSummer7.99±0.057.62±0.068.00±0.05
Winter8.10±0.027.66±0.077.95±0.02
[Lactate] (mmol l-1)BloodSummer2.72±0.1217.01±2.1313.69±1.10
Winter4.76±2.5020.51±4.3515.82±1.18
MuscleSummer9.17±3.4539.69±1.959.71±1.78
Winter3.67±0.6929.97±2.437.70±1.00
LiverSummer4.22±1.60 10.24±1.29 8.41±2.31
Winter3.44±0.983.00±1.055.36±1.63
[Glucose] (mmol l-1)BloodSummer0.75±0.411.01±0.451.36±0.34
Winter0.75±0.290.89±0.311.11±0.42
MuscleSummer0.18±0.041.82±0.101.43±0.26
Winter 1.35±0.16 2.91±0.26 2.51±0.28
LiverSummer0.27±0.101.12±0.390.30±0.08
Winter 1.16±0.07 2.11±0.28 1.14±0.07
O2 (ml g-1 h-1)Summer0.04±0.00N/A0.06±0.00
Winter0.04±0.00N/A 0.08±0.00
CO2 (ml g-1 h-1)Summer0.04±0.00N/A 0.15±0.00
Winter0.04±0.00N/A0.12±0.00
[14C]lactate
    d.p.m. recovered from tissue/breath*MuscleSummer87.5%N/A75.8%
Winter86.3%N/A61.5%
LiverSummer3.5%N/A4.7%
Winter1.8%N/A9.8%
OxidisedSummer9.0%N/A19.5%
Winter11.9%N/A28.7%
  • Values are means ± s.e.m.

  • * % of total d.p.m. recovered.

  • The average (in bold) is significantly greater than the other season (P<0.05, one-way ANOVA, Fisher's PLSD, N=5-8).