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Fire mitigates bark beetle outbreaks in serotinous forests.

Peter C Jentsch1,2, Chris T Bauch1, Madhur Anand2

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Theoretical Ecology
|January 7, 2022
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Forest fires can mitigate bark beetle outbreaks by removing trees and altering forest structure. A simple stand thinning strategy can significantly reduce tree mortality from these combined disturbances.

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Area of Science:

  • Forest Ecology
  • Mathematical Modeling
  • Disturbance Ecology

Background:

  • Bark beetle outbreaks and forest fires cause significant ecological and economic damage.
  • Combined disturbances are projected to intensify due to climate change.
  • Understanding these compound impacts on forest ecosystems is crucial.

Purpose of the Study:

  • To investigate the impact of multiple disturbances (bark beetles and forest fires) on a demographically heterogeneous tree population.
  • To develop a mathematical model to simulate these combined disturbances.
  • To identify potential mitigation strategies.

Main Methods:

  • Developed an age-structured difference equation model.
  • Simulated bark beetle outbreaks and forest fires.
  • Analyzed the model to identify dynamical regimes and effects of interventions.

Main Results:

  • Identified two distinct dynamical regimes for bark beetle and fire interactions.
  • Found that forest fires can dampen bark beetle outbreaks by removing host trees and altering forest demographics.
  • A stand thinning protocol targeting juvenile tree classes significantly reduced bark beetle-induced mortality.

Conclusions:

  • Forest fires can act as a natural regulator of bark beetle populations.
  • Targeted silvicultural practices, like stand thinning, can mitigate the impact of compound disturbances.
  • Mathematical modeling provides a valuable approach for studying complex ecological interactions and management strategies.