# Population Dynamics

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 Author: Anonymous ID: 148152 Filename: Population Dynamics Updated: 2012-04-17 11:36:39 Tags: Population Dynamics Biology Folders: Description: Higher Biology - Unit Three - Population Dynamics Show Answers:

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1. What is a population?
A group of individuals of the same species which makes up part of an ecosystem
2. The number of individuals present per unit area (or unit volume) of a habitat is calleed the...?
population density
3. When birth rate is greater than death rate the population...?
increases
4. When death rate is greater than birth rate the population...?
decreases
5. When a population colonises a new environment population numbers will increase until there are _____ ______ ?
limiting factors
6. What is the carrying capacity of a population?
The maximum population that the ecosystem can sustain
7. What are density-independent factors?
Factors which affect the size of a population regardless of the density of that population
8. Give an example of a density-independent factor
• Forest fire
• Drought
• Excessive rainfall
• High / low temperatures
9. What are density-dependent factors?
Factors which only affect the population size once it has grown to a certain size and density
10. Give an example of a density-dependent factor
• Competition / shortage of food
• Toxic wastes
• Parasitism and disease
• Predation
11. In a predator prey relationship prey numbers fluctuate over time. What happens to predator numbers?
They mirror they prey fluctuations but lag behind them
12. Describe what is happening at each labelled point in the graph
• A - increase in prey population perhaps due to increase in food supply
• B - resulting increase in predator population due to more prey
• C - decrease in prey population due to more predators
• D - decrease in predator population due to fewer prey
• E - increase in prey population due to fewer predators
13. _________ is the tendency of a population to decrease in size when it rises above a certain level and increase in size when it falls below that level?
Regulation

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