Table 2.
Physiological trait variation by mountain and altitude measured in a common environment
| Mountain | Altitude | RMR n | RMR (ml O 2 g -1 h -1 ) | Tukey’s HSD Diff between means | Tukey’s HSD p value | Freeze n | Survival |
|---|---|---|---|---|---|---|---|
| DUB |
HIGH |
8 |
0.07 ± 0.02 |
|
|
0 |
NA |
| DUB |
LOW |
19 |
0.10 ± 0.02 |
0.03 |
<0.01* |
10 |
0.70 |
| IME |
HIGH |
20 |
0.06 ± 0.02 |
|
|
10 |
0.20 |
| IME |
LOW |
19 |
0.05 ± 0.01 |
-0.01 |
0.49 |
10 |
0.70 |
| LAW |
HIGH |
10 |
0.08 ± 0.02 |
|
|
10 |
0.40 |
| LAW |
LOW |
19 |
0.09 ± 0.02 |
0.01 |
0.94 |
10 |
0.90 |
| LOM |
HIGH |
14 |
0.09 ± 0.03 |
|
|
7 |
0.29 |
| LOM |
LOW |
12 |
0.02 ± 0.01 |
-0.07 |
<0.01* |
10 |
0.90 |
| MNT |
HIGH |
20 |
0.07 ± 0.01 |
|
|
10 |
0.40 |
| MNT | LOW | 20 | 0.09 ± 0.02 | 0.02 | 0.03* | 10 | 0.90 |
Shown are the number of individuals per site measured (n), the mean routine metabolic rate (RMR) and the proportion of survivors following freezing (Survival). Standard deviations are indicated for RMR, whereas freeze survival is shown as a single measurement per site. The results of the Tukey’s HSD test of significant difference between the means of RMR of individuals from low- and high-altitude sites, by mountain are shown (Tukey’s HSD p value). A positive difference between the means (Diff between means) shows that individuals from high-altitude have a lower mean RMR than those from low-altitude, and a negative difference between the means shows that individuals from low-altitude have a lower RMR than those from high-altitude.
*Significant at p < 0.05.
NA: No freeze tolerance results are available for DUBHIGH due to complete tadpole mortality prior to the freeze tolerance experiment.