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Populations

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- Demography is the study of processes that influence population size - it is the way we study changes brought about by births, deaths and dispersal

For Northwest Montana, Greater Yellowstone, Central Idaho

Δ N = B – D + I – E

Change in Number = Births – Deaths + Immigration - Emigration

John L. Harper – 1925-2009

Δ N = B – D + I – E

Nfuture = Nnow + B – D + I – E

Often we assume that I = E,

so no net dispersal

Common Field Grasshopper

Red deer fawn

being tagged

for study

Arithmetic scale

Logarithmic scale

A – fish mortality in

typical

population

B – fish taken

by fishing

Population

Pyramid

For France

Jan. 1, 1967