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Populations. Demography. Demography. 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. The Fundamental Equation of Ecology – Harper 1977.

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Demography1
Demography

  • 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


The fundamental equation of ecology harper 1977
The Fundamental Equation of Ecology – Harper 1977

Δ N = B – D + I – E

Change in Number = Births – Deaths + Immigration - Emigration

John L. Harper – 1925-2009


Rearrange fundamental equation
Rearrange Fundamental Equation

Δ N = B – D + I – E

Nfuture = Nnow + B – D + I – E

Often we assume that I = E,

so no net dispersal






Red deer fawn

being tagged

for study


Arithmetic scale

Logarithmic scale



Human management of species may change survivorship curves
Human management of species may change survivorship curves

A – fish mortality in

typical

population

B – fish taken

by fishing


Population

Pyramid

For France

Jan. 1, 1967




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