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Local Population Changes

Local Population Changes

Geographers are more often concerned with local change, and are interested in interpreting the complex patterns of population growth and decline and e relive significance of the two components migration and natural change.
As explained earlier how this is at affected by the scale of the area analyzed, migration being relatively more important in small areal units than in large ones.
Webb devised a useful Cartesian co-ordinate graph to plot natural and emigrational components of population change, from which it is possible to derive eight types of changes as it is clear from the above diagram:

A. Increase: natural gain exceeds net out-migration
B. increase: natural gain exceeds net in-migration
C. increase net in migration , exceeds natural gain
D. Increase: net in-migration exceeds natural loss
E. Decrease: natural loss exceeds net in-migration
F. Decrease: natural loss exceeds net out-migration,
G. Decrease: net out-migration, exceeds natural loss
H: Decrease net out-migration exceeds natural gain

Modernization of a society leads to increased human mobility and greater areal variations in population numbers and characteristics. Age-structures vary more, and the range of natural increase/decrease is greater, as places with high fertility tend to have few deaths and places with high mortality tend to have few births. Old age-structures in advanced countries, especially in rural areas, are primarily responsible for the spread of natural decrease. Modernization of a society leads to increased human mobility and greater areal variations in population numbers and characteristics. Age-structures vary more, and the range of natural increase/decrease is greater, as places with high fertility tend to have few deaths and places with high mortality tend to have few births. Old age-structures in advanced countries, especially in rural areas, are primarily responsible for the spread of natural decrease.