Instructions:

Choose a population type and examine its Age Structure and Survivorship graphs.
Click on the +/-/= symbol to increase/decrease/keep the environmental factors the same.
Set how long you want to age the population and see how it affects the two graphs.
Once you are familiar with how the simulation works, follow the instructions in the question area below.

Type of population

Climate hostility
Outbreak of disease
Predation on offspring
Parental food gathering
Chance of natural disasters
Habitat destruction
Immigration
Emigration
Age Population By
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Age Structure

Population Size:

Survivorship

Introduction

An age structure diagram is influenced by many environmental factors: climate, disease, predation, habitat, and migration. Click on Question 1 to explore one of these influences.

Question 1

Choose Developing Nation from the drop down menu, increase the climate hostility, and age the population by 10 years. Which members of the population suffer most?

Question 2

What immediately happens to a population when you increase the number of environmental challenges? After 50 years?

Question 3

What do you notice about the age structure diagram when you have immigration or emigration?

Show Answer

The youngest members of the population are affected the most.

The number of offspring decreases, and after 50 years, when the older generation dies out, you are left with a much smaller population size.

Those in their peak reproductive years are the ones that generally immigrate or emigrate. If you increase immigration, you will see an increase in the number of individuals in their peak reproductive years.