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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.
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Related Experiment Video

Updated: Sep 3, 2025

Quantitative Analysis of Random Migration of Cells Using Time-lapse Video Microscopy
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Trends and Patterns of Global Refugee Migration.

Sonja Fransen, Hein de Haas

    Population and Development Review
    |July 25, 2022
    PubMed
    Summary

    Global refugee migration intensity has not increased long-term, fluctuating with conflict levels. Displacement numbers rose due to expanded data, with refugees moving from fewer origins to more destinations over greater distances.

    Area of Science:

    • Sociology
    • Political Science
    • Demography

    Background:

    • Global refugee migration patterns are complex and have significant geopolitical implications.
    • Understanding long-term trends is crucial for effective policy-making and humanitarian aid.
    • Previous analyses may have been limited by data scope and methodology.

    Purpose of the Study:

    • To analyze long-term trends in the intensity, spread, and distance of global refugee migration from 1951 to 2018.
    • To identify shifts in origin and destination countries for refugee populations.
    • To examine the relationship between conflict levels and refugee displacement.

    Main Methods:

    • Analysis of global, regional, and country-level refugee migration data spanning over six decades (1951-2018).

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  • Quantitative assessment of refugee numbers relative to world population.
  • Examination of geographic shifts, origin-destination country dynamics, and average migration distances.

    • Main Results:

    • No long-term increase detected in global refugee migration intensity; numbers fluctuated between 0.1-0.3% of the world population, primarily linked to conflict.
    • Apparent increases in displaced populations are attributed to the inclusion of previously excluded data.
    • Refugees originate from fewer countries but move to a wider array of destinations, with increased average travel distances.

    Conclusions:

    • Global refugee migration intensity remains stable, driven by conflict dynamics.
    • Geographic patterns show a concentration of origins and diversification of destinations, alongside increased migration distances.
    • Improved data inclusion and potentially easier travel influence observed shifts in refugee movements.