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Related Experiment Video

Updated: May 15, 2026

Following the Dynamics of Structural Variants in Experimentally Evolved Populations
04:52

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Published on: February 3, 2023

Evolution of specialization under non-equilibrium population dynamics.

Tuomas Nurmi1, Kalle Parvinen

  • 1Department of Mathematics, University of Turku, Turku, Finland. tuilnu@utu.fi

Journal of Theoretical Biology
|January 12, 2013
PubMed
Summary

Evolutionary specialization in resource use can lead to a stable mix of generalist and specialist consumers. Non-equilibrium population dynamics drive this evolution, even leading to evolutionary suicide without Allee effects.

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Mathematical Biology

Background:

  • Understanding specialization in resource utilization is key to predicting community structure and stability.
  • Consumer-resource interactions often exhibit complex population dynamics that can influence evolutionary trajectories.
  • Adaptive dynamics provides a framework for studying gradual evolutionary change in ecological models.

Purpose of the Study:

  • To investigate the evolutionary dynamics of resource specialization in a consumer-resource model.
  • To explore how non-equilibrium population dynamics affect the evolution of resource consumption.
  • To determine the conditions under which a stable coexistence of generalists and specialists can emerge.

Main Methods:

  • Utilized a mechanistically underpinned discrete-time model incorporating adaptive dynamics.
  • Modeled two nutritionally equivalent resources with sigmoid growth and resource-specific carrying capacities.
  • Assumed consumer resource use follows the law of mass-action with trade-offs in consumption rates.
  • Analyzed the resulting consumer population dynamics, characterized by over-compensation.

Main Results:

  • Demonstrated that asynchronous, non-equilibrium population dynamics of specialists can drive evolution towards trimorphic coexistence (one generalist, two specialists).
  • Identified conditions supporting various forms of cyclic evolutionary dynamics.
  • Showed that evolutionary suicide is a possible outcome, even in the absence of Allee effects and demographic stochasticity.

Conclusions:

  • Non-equilibrium population dynamics play a crucial role in shaping the evolution of resource specialization.
  • The model predicts the potential for stable coexistence of diverse feeding strategies.
  • Evolutionary suicide can arise from ecological dynamics alone, highlighting the fragility of populations in fluctuating environments.