Populations
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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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Populations

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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

Δ N = B – D + I – E

Change in Number = Births – Deaths + Immigration - Emigration

John L. Harper – 1925-2009


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


Common Field Grasshopper


Grasshopper – development and incomplete metamorphosis


Red Deer – Stag, Hind, Fawn


Isle of Rhum, Scotland


Red deer fawn

being tagged

for study


Arithmetic scale

Logarithmic scale


General types of 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


Changes in population of Japan over time


Changes in population of Canada from 1971-2006


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