Selection of Day Roosts by Female Long-Legged Myotis in the Central Oregon Cascade Range

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Abstract
We radiotracked 16 female long-legged myotis (Myotis valans) in the central Oregon Cascade Range that used a total of 41 day roosts. Large Douglas-fir (Pseudotsuga menzlesii) snags averaging 97 +/- 7 (SE) cm diameter at breast height (dbh) and 38 +/- 3 m in height were the most commonly used roost structures (88%). The odds that a snag was used as a day roost increased as snag height increased (P < 0.001); after snag height was accounted for, the odds of use decreased as stand height within 20 nl of the snag increased (P = 0.024). The frequency of occurrence of roosts between young and late seral stands did not differ from that by chance in these 2 stand conditions (P = 0.76). Dw roosts generally occurred in upland habitats associated with streams that contained night roosts. Management of large diameter, tall snags that extend above the canopy will provide 1 component of day-roost habitat for long-legged myotis in managed Landscapes.

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