Table 2.

Relationship between group size and minimal ambient temperature (T _a)

Spearman rank correlation	Only adult females	With juveniles
Pre-lactation period	r s = 0.053, N = 61, P = 0.688
Lactation period	r s = 0.092, N = 134, P = 0.290	r s = 0.088, N = 134, P = 0.313
Post-lactation period	r s = 0.257, N = 74, P = 0.027	r s = 0.248, N = 74, P = 0.033
Mean group size—torpor	Mean: 7.6 ± 5.9, N = 80	Mean: 12.1 ± 8.3, N = 80
Pre-lactation period	5.3 ± 4.4 (N = 6)
Lactation period	9.4 ± 5.5 (N = 29)	15.2 ± 9.0 (N = 29)
Post-lactation period	6.7 ± 4.4 (N = 45)	10.9 ± 7.5 (N = 45)
Mean group size—normothermia	12.3 ± 4.9, N = 144	18.3 ± 7.7, N = 144
Pre-lactation period	12.3 ± 1.2 (N = 21)
Lactation period	11.9 ± 4.5 (N = 105)	19.1 ± 7.9 (N = 105)
Post-lactation period	13.1 ± 4.9 (N = 18)	20.9 ± 7.6 (N = 18)

Mean group sizes for Bechstein’s bats (Myotis bechsteinii) that entered torpor and that remained normothermic are shown. Results for only adult females are given in comparison to results considering the presence of juveniles (N number of roosting groups). During the pre-lactation period, offspring was not born yet, and therefore, only one value is given