Population Density and Distribution

Geographic Distribution

Three main Types of Population Dispersion

Multiple Choice

Elephants show this type of population dispersion

• clumped

• Uniform

• Random

Multiple Choice

Territorial bird species protecting their own space show this type of population dispersion

• clumped

• uniform

• random

Multiple Choice

Wind blows dandelion seeds and therefore they have this type of population dispersion

• random

• uniform

• clumped

Reproductive Strategy of a Species

Population Density

Multiple Choice

There are 20 goldfish in my 5 gallon fish tank. What is the population density of goldfish in my tank?

• 10 goldfish per gallon

• 100 goldfish per 100 gallons

• 4 goldfish per gallon

• 5 goldfish per 100 galons

Population Growth Rate

Exponential growth: as a population increases it increases at a faster rate!

Open Ended

List as many reasons as you can remember for the exponential growth of the human population.

Logistic Growth

Multiple Choice

What do you think the carrying capacity of a population is?

• How much weight the population can carry

• How many individuals can be supported by the available resources in the area

• How many individuals can stack on top of one another

• How much food and water can be stored within the organisms in the population

Logistic Growth: Population growth starts slowly, then increases exponential, but then starts to slow as resources become limited

Factors that limit the population, but have nothing to do with the density

• Unusual weather

• Natural disasters

• Human Activities

​Density Independent factors

The density of the population itself creates the limiting factors

• increased competition

• increased predation

• Parasitism and Diseases spread more easily

Density Dependent Factors

Factors that limit the growth of a population

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Predator- Prey Relationships maintain healthy populations of both predator and prey