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Related Concept Videos

Life Histories01:29

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Related Experiment Video

Updated: Jun 22, 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

Alternative dynamical states in stage-structured consumer populations.

Christian Guill1

  • 1Institute of Condensed Matter Physics, Darmstadt University of Technology, Hochschulstrasse 6, D-64289 Darmstadt, Germany. guill@fkp.tu-darmstadt.de

Theoretical Population Biology
|June 16, 2009
PubMed
Summary

This study reveals that structured populations can have alternative stable states, with juvenile or adult dominance. Hysteresis occurs only when juveniles have superior resources, impacting population stability.

Related Experiment Videos

Last Updated: Jun 22, 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

Area of Science:

  • Ecology
  • Population Dynamics
  • Mathematical Biology

Background:

  • Consumer populations often exhibit internal structure, with distinct life stages like juveniles and adults.
  • These stages may utilize different resources and interact in complex ways, influencing overall population dynamics.
  • Understanding these structures is crucial for predicting population persistence under varying environmental conditions.

Purpose of the Study:

  • To investigate the population dynamics of a consumer species with a distinct internal structure (juvenile and adult stages).
  • To explore the existence of alternative stable states under varying mortality and resource availability.
  • To analyze the conditions leading to hysteresis and the impact of multiple juvenile stages on population stability.

Main Methods:

  • Mathematical modeling of a consumer population divided into juvenile and adult individuals.
  • Analysis of population dynamics across a range of mortality rates and resource levels.
  • Numerical simulations to examine the effects of multiple juvenile stages and delays in regulatory mechanisms.

Main Results:

  • The model demonstrates alternative stable states, characterized by either juvenile or adult dominance.
  • Hysteresis between these states is contingent on resource levels: it occurs when juveniles have more resources than adults.
  • Introducing multiple juvenile stages can lead to periodic orbits in the adult-dominated state due to regulatory delays.

Conclusions:

  • Population structure significantly influences stability and the potential for alternative stable states.
  • Resource partitioning between life stages is a critical factor determining hysteresis and population resilience.
  • Stage-structured models can approximate continuous size-structured models with a large number of developmental stages.