Related Experiment Video
Updated: Aug 12, 2026

07:27
Quantitative Analysis of Random Migration of Cells Using Time-lapse Video Microscopy
Published on: May 13, 2012
Population change and migration in Britain since 1981: evidence for continuing deconcentration
Summary
Britain
Area of Science:
- Demography
- Urban Studies
- Human Geography
Background:
- Examining spatial distribution and internal migration patterns in Britain.
- Utilizing small-area statistics from the 1981 and 1991 censuses.
Purpose of the Study:
- To analyze recent trends in population growth rates between metropolitan and nonmetropolitan areas.
- To investigate the relationship between urban status and population change.
- To identify shifts in migration patterns in mid-1980s Britain.
Main Methods:
- Analysis of small-area statistics from national censuses.
- Comparative study of population growth rates in different regions.
- Review of spatial distribution and internal migration data.
Main Results:
- Narrowing population growth rate differentials between metropolitan and nonmetropolitan Britain in the 1980s.
- Persistent negative relationship between urban status and population change.
- Resurgence of nonmetropolitan growth in mid-1980s Britain, contrasting with other countries.
Conclusions:
- Despite narrowing differentials, urban areas continued to experience slower population growth.
- The resurgence of nonmetropolitan growth in Britain during the 1980s was a significant national trend.
Keywords:
Demographic FactorsDeveloped CountriesEuropeGeographic FactorsMigrationMigration, InternalNorthern EuropePopulationPopulation CharacteristicsPopulation DynamicsPopulation GrowthRural PopulationSpatial Distribution--changesTurnaround MigrationUnited KingdomMore Related Videos
Related Concept Videos
Migration
Migration is long-range, seasonal movement from one region or habitat to another. This common strategy, carried out by many different organisms around the world, is an adaptive response that typically corresponds to changes in an organism’s environment, like resource availability or climate. Migrations can involve huge groups of thousands of animals as well as single individuals traveling alone and can range from thousands of kilometers to just a few hundred meters.
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.However, realistic environmental conditions limit the number of...
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).Mechanisms of Genetic VariationThe original sources of genetic variation are mutations,...
Conservation of Declining Populations
Conservation of declining population focuses on ways of detecting, diagnosing, and halting a population decline. The approach uses methods to prevent populations from going extinct.
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.Life is not fair. A deer grazing contentedly in a field can have her meal cut tragically short by a bolt of lightning. If the doomed doe is one of only three in the population, 1/3 of the population’s gene pool is lost. Random events like this can...
Gene Flow
Gene flow is the transfer of genes among populations, resulting from either the dispersal of gametes or from the migration of individuals.

