Species | Season |
H
l
|
H
u
|
H
u/h
l
|
H
min
|
H
max
|
H
max/h
min
|
|---|
Melopsittacus undulatus
| Summer | 2.00 | 8.65 | 4.325 | 1.80 | 7.0 | 3.9 |
Melopsittacus undulatus
| Winter | 1.83 | 8.13 | 4.44 | 1.73 | 7.0 | 4.1 |
Chloris chloris
| Summer | 2.03 | 6.84 | 3.4 | 1.81 | 7.0 | 3.9 |
Chloris chloris
| Winter | 2.15 | 8.03 | 3.7 | 1.80 | 6.8 | 3.8 |
- Abbreviations: h
l thermal conductance at rest (night) at low temperatures (kJ/bird day °C), h
u thermal conductance at rest (night) at upper critical temperature (h
u = BMR/(T
B − T
uc) (kJ/bird day  °C), h
min minimal nonevaporative thermal conductance at rest (night), h
min (SMR − SMR × %H
e1/100) − (BMR − BMR × %H
e2/100)/(T
lc − T
A) (kJ/bird day C), where SMR is standard metabolism at 0 °C, %H
e1 is the percentage of evaporative heat loss at this temperature, BMR is basal metabolism, %H
e2 is the percentage of evaporative heat loss at T
AÂ =Â T
lc, T
lc is the lower critical temperature and T
A is the ambient temperature at which SMR is measured (in this case 0 °C); h
max, maximal nonevaporative thermal conductance at rest (night), h
max = (BMR − BMR × %H
e3/100)/(T
B − T
uc), (kJ/bird day °C), where %H
e3 is the percentage of evaporative heat loss at T
uc, T
uc is the upper critical temperature, T
B is body temperature. Average body mass and number of measured bird as in Table 1
- Differences are not significant (p > 0.05) between the summer and winter values in Chloris chloris and in Melopsittacus undulatus
