Chapter 8 Populations

Word Cloud

What defines a population?

​3 Population Properties

1) Size – The number of individuals.

2) Density – How many individuals exist per unit area.

3) Dispersion – The spatial distribution (clumped, uniform, random).

Open Ended

What makes a population get bigger?

Population growth simulation

Rule: If you are sitting you are quiet
(you don't exist)

I will call on two people to stand up

You are "initial population"

Each of you choose to bring someone in the population tell them to stand up

What's the total now?

Each of you choose to bring someone in the population tell them to stand up

What's the total now?

Each of you choose to bring someone in the population tell them to stand up

What's the total now?

Uh oh!! Disease hits. I choose 10 people to sit down (they died)

Those standing bring someone into he population

Uh oh!! Food shortage. I choose 3 people to sit down (they died to starvation)

Those standing bring someone into the population

Uh oh!! predation. I choose 3 people to sit down (they were eaten)

Those standing bring someone into the population

Multiple Choice

Which of the following factors influence population size?

• a. Birth rate and death rate
  

• b. Immigration and emigration
  

• c. Availability of resources
  

• d. All of the above

Multiple Choice

How is population density calculated?

• a. Population Size × Area
  

• b. Area ÷ Population Size
  

• c. Population Size ÷ Area
  

• d. Birth Rate ÷ Death Rate

Multiple Choice

What type of dispersion occurs when individuals are evenly spaced due to territorial behavior?

• a. Random
  

• b. Uniform
  

• c. Clumped
  

• d. Scattered

Multiple Choice

What is the most common dispersion pattern in nature?

• a. Clumped
  

• b. Uniform
  

• c. Random
  

• d. Evenly distributed

Multiple Choice

Under what conditions does exponential growth occur?

• a. When resources are limited
  

• b. When resources are unlimited

• 
  c. When predators are abundant
  

• d. When carrying capacity is exceeded

Multiple Choice

Which graph shape represents exponential growth?

• a. S-shaped curve
  

• b. Straight line
  

• c. J-shaped curve
  

• d. U-shaped curve

Multiple Choice

Why can’t exponential growth continue indefinitely?

• a. Populations grow too slowly
  

• b. Limiting factors prevent it
  

• c. Resources become infinite
  

• d. Carrying capacity increases exponentiall

Multiple Choice

which of these can be considered a "limiting factor"

• disease

• predator prey relationships

• food availability

• all the above

Multiple Choice

Which of the following is a density-dependent limiting factor?

• a. Floods
  

• b. Disease
  

• c. Climate change
  

• d. Drought

Multiple Choice

Which of the following is a density-independent limiting factor?

• a. Predation
  

• b. Competition
  

• c. Hurricane
  

• d. Disease

Draw

sketch a graph shape for population size (y axis) and time (x axis) where there are no limiting factors.

Draw

sketch a graph shape for population size (y axis) and time (x axis) where limiting factors are included

Hand in lab handout and begin reading chapter 8.1. (Active Reading Questions on Canvas)