Table 3.
Mean differences and variance ratios (95% CI) for winter (December–February) microclimate measures of ambient conditions and in the Milieu Souterrain Superficiel (MSS) used by little brown bats for hibernation in Juneau, Alaska. Differences are MSS–ambient and variance ratios are the variance of the ambient measure divided by the variance of the MSS measure; values > 1 indicate ambient measures are more variable than MSS measures. Values were summarized separately for cold (2013–2014 and 2016–2017) and warm (2014–2015 and 2015–2016) winters.
| Variable | Winter | n | Mean difference (MSS−ambient) | Variance ratio (ambient/MSS) |
|---|---|---|---|---|
| Temperature (Tdiff, Tvr) | Cold | 9 | 1.9 (0.7, 3.0) | 26.6 (10.4, 42.7)a |
| Warm | 14 | 0.3 (−0.1, 0.7) | 13.1 (0.7, 25.5) | |
| Mean RH (RHdiff, RHvr) | Cold | 7 | 5.3 (4.0, 6.5)) | 131.6 (96.5, 166.8) |
| Warm | 5 | 4.3 (1.7, 7.0) | 97.3 (0, 207.3) | |
| 10th percentile RH (RHdiff10) | Cold | 7 | 23.9 (18.2, 29.7) | |
| Warm | 5 | 19.5 (9.5, 29.4) |
a One outlier data point removed from this analysis.