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

Populations


Demography

Demography


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


Populations

Common Field Grasshopper


Grasshopper development and incomplete metamorphosis

Grasshopper – development and incomplete metamorphosis


Red deer stag hind fawn

Red Deer – Stag, Hind, Fawn


Isle of rhum scotland

Isle of Rhum, Scotland


Populations

Red deer fawn

being tagged

for study


Populations

Arithmetic scale

Logarithmic scale


General types of survivorship curves

General types of survivorship curves


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


Populations

Population

Pyramid

For France

Jan. 1, 1967


Changes in population of japan over time

Changes in population of Japan over time


Changes in population of canada from 1971 2006

Changes in population of Canada from 1971-2006


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