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Related Experiment Videos

Moose-tree interactions: rebrowsing is common across tree species.

Karen Marie Mathisen1, Jos M Milner2, Christina Skarpe3

  • 1Department of Forestry and Wildlife Management, Faculty of Applied Ecology and Agricultural Sciences, Inland Norway University of Applied Sciences, Pb 400, 2418, Elverum, Norway. karen.mathisen@inn.no.

BMC Ecology
|April 6, 2017
PubMed
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Plant regrowth after browsing by moose (Alces alces) increases attractiveness to herbivores, creating a positive feedback loop. This repeated browsing can negatively impact tree populations, especially at high cervid densities.

Area of Science:

  • Ecology
  • Plant-herbivore interactions
  • Forestry

Background:

  • Plants employ tolerance and avoidance strategies against herbivory.
  • Tolerance, like rapid regrowth, can paradoxically increase herbivore attraction.
  • Moose browsing in boreal forests exemplifies this positive feedback loop.

Purpose of the Study:

  • Quantify accumulated browsing effects on tree morphology.
  • Assess if accumulated browsing predicts current browsing probability and extent.
  • Relate browsing index to tree height, shoot availability, and size.

Main Methods:

  • Developed an index of accumulated browsing over time.
  • Evaluated browsing probability and extent across woody species in a Norwegian boreal forest.
Keywords:
Accumulated browsingAlces alcesBroomingCompensatory growthHeightPalatabilityRegrowthTolerance

Related Experiment Videos

  • Correlated the index with changes in tree height, shoot availability, and shoot size.

    • Main Results:

    • Browsing probability and extent increased with accumulated browsing across all tree species.
    • Previously browsed trees remained highly attractive, showing no decreased preference.
    • Increased shoot availability and palatability likely drive this sustained preference.

    Conclusions:

    • Rapid regrowth adaptations do not reduce, but rather increase, future herbivory.
    • This response can lead to increased tree mortality at high cervid densities.
    • Findings have implications for plant population dynamics and forestry management.