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Tree diversity increases robustness of multi-trophic interactions.

Felix Fornoff1, Alexandra-Maria Klein1, Nico Blüthgen2

  • 11 Chair of Nature Conservation and Landscape Ecology, Faculty of Environment and Natural Resources, University of Freiburg , Tennenbacherstraße 4, 79196 Freiburg , Germany.

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Summary

Increased tree diversity enhances forest ecosystem functions by boosting biodiversity at higher trophic levels. This strengthens multi-trophic interactions, promoting overall ecosystem stability and resilience.

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Area of Science:

  • Ecology
  • Forest Ecology
  • Community Ecology

Background:

  • Global biodiversity decline threatens ecosystem functions.
  • Understanding how trophic interactions respond to biodiversity change is critical.
  • Multi-trophic interactions are essential for ecosystem stability.

Purpose of the Study:

  • To investigate the impact of tree diversity on plant-Hemiptera (antagonism) and Hemiptera-ant (mutualism) interaction networks.
  • To determine how biodiversity changes at one trophic level affect interactions at higher levels.
  • To assess the robustness of multi-trophic interactions under varying tree diversity.

Main Methods:

  • Experimental manipulation of tree diversity in forest ecosystems.
  • Analysis of plant-Hemiptera and Hemiptera-ant interaction networks.
  • Network analyses to quantify species diversity, interaction robustness, and specialization.

Main Results:

  • Increased tree diversity led to higher diversity of Hemiptera and ants.
  • Higher tree diversity enhanced the robustness of multi-trophic interactions through species redundancy.
  • Tree diversity increased the number of interacting species and decreased specialization within interaction networks.

Conclusions:

  • Bottom-up effects of tree diversity cascade through trophic levels, influencing both antagonist and mutualist interactions.
  • Local tree diversity is a significant driver of multi-trophic community diversity and interaction robustness in forests.
  • Maintaining forest tree diversity is crucial for ecosystem functioning and resilience.