Apparent survival of tree voles
Mean daily apparent survival rate (DSR) for female tree voles was 0.995
(SE = 0.00176; n = 34) and 0.983 for male tree voles
(SE = 0.00849; n = 7) using a 63-days sampling period.
Estimated annual apparent survival was 0.099 (95% CI : -0.027,
0.226) for females and 0.005 (95% CI : -0.023, 0.033) for males,
and although 95% confidence intervals overlapped substantially was
overall higher for females. Daily survival was sensitive to the length
of the monitoring period with a gradual decline in estimated survival in
periods longer than 56-days (Fig 6a). Presence of a weasel at a nest
platform decreased daily survival of tree voles throughout the marking
period (Fig. 6b). We observed two mortalities of marked tree voles, at
25 and 47 days after capture; both were attributed to a short-tailed
weasel. Nine of 34 females (26%) and four of seven (57%) males were
observed at two nest platform with mean distances moved of 138.2 ± 68.7
m and 84.5 ± 36.4 m from initial to subsequent nest platform,
respectively; none were observed at >2 nest platforms.