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Related Concept Videos

Genetic Drift

Genetic Drift

Natural selection—probably the most well-known evolutionary mechanism—increases the prevalence of traits that enhance survival and reproduction. However, evolution does not merely propagate favorable traits, nor does it always benefit populations.

Mutation, Gene Flow, and Genetic Drift

Mutation, Gene Flow, and Genetic Drift

In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).

Population Growth

Population Growth

Population size is dynamic, increasing with birth rates and immigration, and decreasing with death rates and emigration. In ideal conditions with unlimited resources, populations can increase exponentially, which plots as a J-shaped growth rate curve of population size against time. This type of curve is characteristic of newly-introduced invasive species, or populations that have suffered catastrophic declines and are rebounding.

Gene Flow

Gene Flow

Gene flow is the transfer of genes among populations, resulting from either the dispersal of gametes or from the migration of individuals.

Frequency-dependent Selection

Frequency-dependent Selection

When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.

Speciation Rates

Speciation Rates

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Related Experiment Video

Updated: Jan 14, 2026

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Published on: February 3, 2023

Feedback-driven coevolution in finite structured populations.

Chang Sun¹, Haiyan Tian¹, Yafei Zhang¹

¹School of Mathematical Sciences, Hebei Normal University, Shijiazhuang 050024, People's Republic of China.

Chaos (Woodbury, N.Y.)

|October 17, 2025

Summary

This summary is machine-generated.

Finite population structure significantly impacts cooperation evolution. Environmental feedback and population dynamics jointly modulate cooperation, revealing complex evolutionary outcomes like oscillations and bistability.

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Area of Science:

Evolutionary game theory
Population dynamics
Social evolution

Background:

Cooperation evolution is influenced by population structure.
The interplay of population size, topology, and environmental feedback on cooperation remains unclear.

Purpose of the Study:

Investigate the coevolution of strategies and environmental feedback in finite structured populations.
Analyze how population structure and environmental feedback jointly affect cooperation dynamics.

Main Methods:

Utilized an evolutionary game dynamics model.
Incorporated environmental feedback mechanisms and pairwise comparison update rules.
Performed theoretical analysis and numerical simulations.

Main Results:

Observed diverse evolutionary outcomes: periodic oscillations, coexistence of cooperation and defection, and bistability.
Confirmed theoretical predictions through numerical simulations.
Identified synergistic effects of neighbor number and environmental feedback rates on cooperation evolution and basin stability.

Conclusions:

Population structure significantly impacts the evolution of cooperation.
Understanding these dynamics is crucial for advancing cooperation research.
Environmental feedback and population structure are key modulators of cooperative behaviors.