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JenaTron - An Experimental Approach to Study the Effects of Plant History and Soil History on Grassland Ecosystem Functioning
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Multifaceted effects of variable biotic interactions on population stability in complex interaction webs.

Koya Hashimoto1,2,3, Daisuke Hayasaka4, Yuji Eguchi5

  • 1Faculty of Agriculture, Kindai University, Nakamachi 3327-204, Nara, Nara, 631-8505, Japan. atrophaneura4@gmail.com.

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Ecological interaction variability impacts population stability against pesticides. Negative density-dependence stabilizes populations, while positive or independent variability destabilizes them, highlighting variability

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Area of Science:

  • Ecology
  • Environmental Science
  • Community Ecology

Background:

  • Biotic interactions in ecological communities change over time.
  • This temporal variability may influence how communities respond to human disturbances like pesticide application.
  • Understanding interaction variability is key to predicting ecological stability.

Purpose of the Study:

  • To investigate the heterogeneity of interaction variability within a natural community.
  • To assess the impact of this variability on population stability under pesticide exposure.
  • To specifically examine the role of density-dependence in interaction effects.

Main Methods:

  • Utilized outdoor mesocosms containing a freshwater community.
  • Analyzed density-dependent and density-independent interaction variability.
  • Quantified the effect of interaction variability on population stability.

Main Results:

  • Significant heterogeneity in density-dependent interaction variability was observed among community links.
  • Negative density-dependent interaction variability stabilized populations.
  • Positive density-dependence and density-independent variability destabilized populations.
  • Mean interaction strength did not significantly affect population stability.

Conclusions:

  • Interaction variability, not just average strength, is crucial for predicting ecological impacts of disturbances.
  • Density-dependence of interaction variability plays a multifaceted role in community stability.
  • Findings underscore the importance of considering dynamic interaction variability in ecological risk assessments for pesticides.