Chapter 4- Ecology

Kahoot: WHat does NPP measure?

plant growth

Kahoot: On a global scale, what type of population distribution do humans show?
A) Clumped
B) Random
C) Uniform
D) Homogeneous

A) Clumped

Kahoot: Growth rate = _____________________

Birth rate- Death rate= Growth rate

Kahoot: Which of the following is a density independent factor?
A) Drought
B) Increased risk of infectious diseases
C) Limited food supplies
D) Increase in toxic waste levels

A) Drought

How many people has the UN estimated as of 2022?

8 billion

How many people did the UN estimate lived on Earth in 2012?

7.2 billion people (Double the population from 1965)

How many people are estimated to live on Earth in 2100?

11 billion people (possibly)

Define population dispersion.

How organisms are distributed in space.
Ex: Clumped distribution, uniform distribution, and random distribution

OE: What is the growth rate formula?

Birth rate - Death rate = Growth rate

Remember, B comes before D in the alphabet.

What is the current growth rate?

~1.2% per year

What is the current population of people on earth?

7.7 billion (on slides)
UN estimates 8 billion as of 11/15/22 though

How many people are added to the population each year?

86 million people each year

How many people are added to the population every day?

250,000

How many people are added to the population each second?

3

Can a population grow to unlimited numbers?

no, studies show that no population can grow to unlimited numbers

Define "Carrying capacity"

The maximum population that can be supported indefinitely in a given environment

Populations grow ___________

exponentially

Provide examples of things limited by environmental resources

Food, water, shelter, space

What are density dependent factors?

Population limiting factors that increase with population size

Provide examples of density dependent factors

Limited food supply, increased risk of disease, increase in waste levels

What is caused due to density dependent factors?

Decrease in birth rates, increase in death rates

Define density independent factors

Influence population growth rates regardless of population

Provide examples of density independent factors

Droughts, temperature extremes, natural disasters

What was the population growth rate in the 1960s

2.1%

Kahoot: Which cause of extinction poses the most serious threat to biodiversity today?
A) Degradation of habitat
B) Introduction of non-native species
C) Overharvesting
D) Effects of pollution

A) Degradation of habitat

Kahoot: At present rate of global habitat destruction, what % of species nay disappear in 50 years?
A)5
B)25
C)50
D)100

B) 25

Kahoot: Which trophic level would include a dairy cow?
A) Producer
B) Secondary consumer
C) Primary consumer
D) Decomposer

C) Primary consumer

kahoot: which cause of extinction poses the most serious threat to biodiversity today?
A) Degradation of habitat
B) introduction of non-native species
C) Overharvesting
D) effects of pollution

A) Degradation of habitat

Kahoot: At present rate of global habitat destruction, what % of species may disappear in 50 years?

5, 25, 50, 100

25%

Kahoot: which tropic level would include a dairy cow?

A) Producer
B) secondary consumer
C) primary consumer
D) Decomposer

C) Primary consumer

Kahoot: To preserve resources, it is better to eat a....
Lower level or higher level?

Lower

Kahoot: In "hot spots" we find this % of all species
0,100, 10, or 50?

50%

Kahoot: Winter weather is colder because Earth is moving further from the sun. True or false?

False

Kahoot: True or false... the higher the altitude, the higher the temperature.

False

Kahoot: What percent of humans are urbanized?

50