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Related Concept Videos

Migration00:53

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.
Cell Migration01:19

Cell Migration

Cell migration is a process by which the cells move from one location to another, playing an essential role in embryological development, repair and regeneration, immune response, and metastasis. Cells migrate in response to chemical or mechanical signals generated by specific organs or tissues. The overall mechanism includes three steps - polarization, protrusion, and release. Polarization involves the formation of a distinct cell front and rear, which determines the direction of movement.
Cell Migration01:09

Cell Migration

Cell migration, the process by which cells move from one location to another, is essential for the proper development and viability of organisms throughout their life. When cells are not able to migrate properly to their ordained locations, various disorders may occur. For example, disruption in cell migration causes chronic inflammatory diseases such as arthritis.
Cytoskeletal Coordination in Cell Migration01:32

Cytoskeletal Coordination in Cell Migration

A migrating cell changes its shape during the cyclic events of attachment and detachment from the substratum and repositions the cell organelles correspondingly. These complex events are orchestrated by the dynamic cytoskeletal network comprising actin filaments, intermediate filaments, and microtubules. Cytoskeletal crosstalk — the direct and indirect communication between the different components — is crucial for this coordination. Direct communication involves various linker proteins that...
Gene Flow02:39

Gene Flow

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

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Trajectory Data Analyses for Pedestrian Space-time Activity Study
16:14

Trajectory Data Analyses for Pedestrian Space-time Activity Study

Published on: February 25, 2013

Global spatio-temporal patterns in human migration: a complex network perspective.

Kyle F Davis1, Paolo D'Odorico, Francesco Laio

  • 1Department of Environmental Sciences, University of Virginia, Charlottesville, Virginia, United States of America. kfd5zs@virginia.edu

Plos One
|February 2, 2013
PubMed
Summary
This summary is machine-generated.

International migration, a key driver of globalization, forms a complex network. This study reveals the global migration network became more interconnected from 1960-2000, driven by historical, cultural, and economic ties.

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Area of Science:

  • Sociology
  • Network Science
  • Globalization Studies

Background:

  • International migration is a fundamental human adaptive strategy and a significant driver of globalization.
  • The structure and evolution of the global migration network remain poorly understood.
  • Understanding migration networks is crucial for comprehending global interconnectedness.

Purpose of the Study:

  • To analyze the topology and temporal evolution of the global human migration network.
  • To identify factors influencing migrant destination choices.
  • To understand the formation of migration communities.

Main Methods:

  • Analysis of global migration data from 1960 to 2000.
  • Network analysis techniques to quantify network properties (e.g., transitivity, path length, degree distribution).
  • Statistical modeling to assess the influence of historical, cultural, and economic factors on migration patterns.

Main Results:

  • The global human migration network exhibited increased interconnectedness between 1960 and 2000.
  • Network metrics indicated strengthening 'small-world' characteristics, with decreased average path length and increased transitivity.
  • Migrant destination choices were significantly influenced by colonial/postcolonial histories, language, religion, and geographic distance.
  • Distinct migration communities formed based on shared historical, cultural, and economic factors.

Conclusions:

  • The global migration network has evolved towards greater connectivity and 'small-world' properties over the late 20th century.
  • Historical, cultural, and economic factors play a crucial role in shaping migration patterns and community formation.
  • The study provides novel insights into the complex dynamics of international migration networks and their underlying drivers.