Factors governing outbreak dynamics in a forest intensively managed for mountain pine beetle

Area of Science:

• Forestry
• Ecology
• Entomology

Background:

• Mountain pine beetle (MPB) outbreaks cause significant economic and ecological damage to North American pine forests.
• Ecological and environmental factors influence MPB life-history and forest susceptibility, aiding in early detection and control.
• Understanding these factors is crucial for managing MPB populations and mitigating outbreak impacts.

Purpose of the Study:

• To quantitatively analyze the ecological and environmental factors driving MPB infestations across different outbreak phases.
• To investigate how these factors shift during the onset, peak, and collapse of an MPB outbreak in a managed forest.
• To provide data-driven insights for targeted forest management strategies.

Main Methods:

• Utilized logistic regression analysis on a detailed, georeferenced dataset.
• Examined factors influencing MPB infestations in Cypress Hills during an isolated outbreak.
• Compared findings with literature on uncontrolled MPB outbreaks.

Main Results:

• MPB presence is strongly correlated with nearby beetle pressure, especially during the outbreak peak.
• Ecological and environmental factor roles align with findings from uncontrolled forests, but exhibit phase-specific shifts.
• Predictive accuracy for MPB outbreak locations requires integrating weather and host variables alongside beetle pressure.

Conclusions:

• Intensive forest management does not fundamentally alter the influence of ecological factors on MPB outbreaks.
• Identifying phase-specific drivers allows for more effective and focused management interventions.
• The study provides actionable insights for optimizing resource allocation in MPB control efforts.