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Related Concept Videos

Population Growth00:57

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.
Modeling with Differential Equations01:25

Modeling with Differential Equations

Population dynamics can be described mathematically by considering the population size P(t) as a function of time. The rate of change of the population is then represented by the derivative of P(t). A simple assumption is that the rate of growth is proportional to the size of the population itself. This leads to an exponential growth model, where the population increases rapidly without bound. While this is a useful first approximation, it does not reflect realistic long-term...
Mechanistic Models: Compartment Models in Individual and Population Analysis01:23

Mechanistic Models: Compartment Models in Individual and Population Analysis

Mechanistic models are utilized in individual analysis using single-source data, but imperfections arise due to data collection errors, preventing perfect prediction of observed data. The mathematical equation involves known values (Xi), observed concentrations (Ci), measurement errors (εi), model parameters (ϕj), and the related function (ƒi) for i number of values. Different least-squares metrics quantify differences between predicted and observed values. The ordinary least squares (OLS)...
What are Populations and Communities?00:30

What are Populations and Communities?

Overview
Mutation, Gene Flow, and Genetic Drift01:09

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).
Hardy-Weinberg Principle01:49

Hardy-Weinberg Principle

Diploid organisms have two alleles of each gene, one from each parent, in their somatic cells. Therefore, each individual contributes two alleles to the gene pool of the population. The gene pool of a population is the sum of every allele of all genes within that population and has some degree of variation. Genetic variation is typically expressed as a relative frequency, which is the percentage of the total population that has a given allele, genotype or phenotype.

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Related Experiment Video

Updated: May 27, 2026

Analysis of Cell Migration within a Three-dimensional Collagen Matrix
08:02

Analysis of Cell Migration within a Three-dimensional Collagen Matrix

Published on: October 5, 2014

Individual mobility in a stationary population.

N Keyfitz

    Population Studies
    |November 17, 2011
    PubMed
    Summary

    Population growth currently enhances personal mobility. However, as populations inevitably stabilize, this trend will reverse, making mobility increasingly challenging.

    Area of Science:

    • Demography
    • Urban Planning
    • Sociology

    Background:

    • Rising global populations have historically correlated with increased individual mobility.
    • Technological advancements and economic development have further facilitated movement.

    Purpose of the Study:

    • To analyze the relationship between population dynamics and individual mobility.
    • To forecast the impact of population stabilization on future mobility patterns.

    Main Methods:

    • Analysis of demographic trends and historical mobility data.
    • Predictive modeling based on population projections.

    Main Results:

    • Current population increases are a primary driver of enhanced mobility.
    • Projected population stabilization indicates a future decline in mobility.

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    Age-dependent Dynamics of Locomotion in Caenorhabditis elegans: A Lyapunov Exponent Analysis

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    Last Updated: May 27, 2026

    Analysis of Cell Migration within a Three-dimensional Collagen Matrix
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    Analysis of Cell Migration within a Three-dimensional Collagen Matrix

    Published on: October 5, 2014

    Monitoring Spatial Segregation in Surface Colonizing Microbial Populations
    07:40

    Monitoring Spatial Segregation in Surface Colonizing Microbial Populations

    Published on: October 29, 2016

    Age-dependent Dynamics of Locomotion in Caenorhabditis elegans: A Lyapunov Exponent Analysis
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    Conclusions:

    • The demographic transition towards stationary populations presents a significant challenge to maintaining current levels of individual mobility.
    • Future urban and transportation planning must account for reduced mobility in stable population scenarios.