INFLUENCE OF VEHICULAR TRAFFIC ON TIME BUDGETS OF NESTING BURROWING OWLS

Adult burrowing owls (Speotyto cunicularia) commonly nest near roads o n the Rocky Mountain Arsenal (RMA), Colorado, and had the potential to be disturbed during environmental clean-up operations. Thus, we chara cterized time-budgets of adults during 1990-91 to determine potential impacts of environmental cleanup traffic on their nesting behavior. Ma les and females differed in time spent resting (P less-than-or-equal-t o 0.01), alert (P = 0.002), and out-of-sight (P = 0.004) in the pre-ha tch season. From pre- to post-hatch seasons, male alert behavior decre ased, while time spent out-of-sight increased (P = 0.0001). Female ale rt behavior increased, while out-of-sight behaviors decreased (P = 0.0 001). Vehicular disturbance observed in this study (0-16 vehicles/15 m in) was only weakly correlated to two of 8 behaviors (locomotion and a lert). Vehicular traffic, our index of cleanup disturbance, therefore had little impact on nesting burrowing owl behavior, and it had no imp act on productivity even though nesting locations placed them in close proximity.