Predator-prey interactions in the canopy

Area of Science:

• Ecology
• Wildlife Biology
• Forestry

Background:

• Small mammal populations are often regulated by resource availability and predation.
• Predators can impact prey populations through direct mortality and nonlethal effects like nest abandonment.
• Studying predator-prey dynamics in controlled environments, like those with increased resources, offers unique insights.

Purpose of the Study:

• To investigate predator-prey interactions affecting arboreal red tree voles (Arborimus longicaudus) in young forest stands.
• To assess the impact of predation, including lethal and nonlethal effects, on tree vole populations.
• To examine how resource availability influences predator-prey dynamics in this ecosystem.

Main Methods:

• Remote cameras monitored 168 nest platforms in young forest stands over three years.
• Data collected included tree vole and predator activity, nest occupancy, and mortality events.
• Statistical analyses were used to determine predator effectiveness and impact on tree vole activity.

Main Results:

• Tree voles were frequently detected, while flying squirrels were detected more often than they built nests.
• Weasels were identified as highly effective predators of tree voles, causing significant declines in activity post-detection.
• Predator detections were infrequent, but positively correlated with tree vole presence, suggesting predator attraction to prey.

Conclusions:

• Predation pressure, via mortality and nest abandonment, likely contributes to the local instability of tree vole populations in young forests.
• The study suggests that while direct predation may not be the sole limiting factor, its cumulative effects on nest site availability are significant.
• Further monitoring is recommended to fully assess the long-term impacts of predation on tree vole population dynamics.