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Related Experiment Video

Updated: Feb 14, 2026

Laboratory Estimation of Net Trophic Transfer Efficiencies of PCB Congeners to Lake Trout Salvelinus namaycush from Its Prey
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Interactions between predation and disturbances shape prey communities.

Canan Karakoç1, Viktoriia Radchuk2, Hauke Harms1,3

  • 1Department of Environmental Microbiology, Helmholtz Centre for Environmental Research - UFZ, Permoserstrasse 15, 04318, Leipzig, Germany.

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Predation significantly impacts microbial communities more than disturbances. Understanding ecological dynamics requires dynamic measurements, not just endpoints, to grasp community recovery and resistance.

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Area of Science:

  • Ecology
  • Microbial Ecology
  • Community Ecology

Background:

  • Ecological disturbances are key drivers of biodiversity.
  • Many studies use endpoint measurements, neglecting community dynamics and multi-trophic interactions.
  • Understanding context dependency requires manipulating multiple biotic and abiotic factors.

Purpose of the Study:

  • To experimentally test the effects of disturbances on microbial communities.
  • To investigate the role of predation in multi-trophic community responses to disturbances.
  • To compare resistance and recovery properties under different disturbance regimes.

Main Methods:

  • Utilized model microbial communities to simulate ecological disturbances (dilution, resource deprivation).
  • Imposed press and pulse disturbances in the presence and absence of a protist predator.
  • Monitored bacterial abundance, diversity, and community structure at multiple time points.

Main Results:

  • Predation had a greater effect on bacterial abundance, diversity, and composition than disturbance type or resource availability.
  • Disturbance type influenced predator abundance, leading to temporary reductions in predation pressure.
  • Bacterial community composition varied significantly across different temporal phases.

Conclusions:

  • Endpoint measurements are insufficient for understanding ecological community recovery.
  • Predation is a critical factor shaping microbial community responses to disturbances.
  • Dynamic monitoring is essential for assessing community resistance and recovery properties.