Population Ecology

Tuesday 10.15.2013

DO NOW:• Define

population. Give one example and explain why this is a population. (Why is this not a community?)

Objectives:SWBAT: Compare and

Contrast density-independent factors and density-dependent factors in a Venn Diagram.

SWBAT: Identify how the birth rate and death rate effect the rate at which a population changes.

Topic: Population ecology and human population

Population Characteristics

1.Population Density

1.The number of organisms per unit area.ex. Downtown Chicago has a very high population density.

Population Characteristics

2. Dispersion

3 Types:1. Uniform

ex. All individuals within the population are spaced out evenly in the habitat

2. Clumpedex. Individuals live in packs or herds (4-5 wolves live together); school of fish3. Randomex. Individuals live randomly throughout appropriate habitats

Dispersion

Think, Pair, ShareSpecies of small fish often

clump together and form schools of fish, but large fish usually do not form schools.

What advantage do smaller fish gain by forming clumped groups or schools?

Population Limiting Factors

Density- Independent Factors

Any factor in the environment that does not depend on the number of members in a population.

- Usually abiotic- Weather Events (hurricanes, tornadoes)

Population Limiting Factors

Density-Dependent Factor

Any factor in the environment that depends on the number of members in a population-Often Biotic

-Predation-Disease-Parasites-Competition

Venn Diagram- Group Practice (4min)

•Draw a Venn Diagram that compares and contrasts density-independent factors and density-dependent factors.

Population Growth

Emigration:

Immigration:

The number of individuals who move AWAY fromthe populationex. If you & your family move to china!

The number of individuals who move into a Population ex. My parents immagrated to the USA from Mexico

Population Growth: Draw Graph on

either side!Exponential Growth Model

Shows how a population would grow if therewere no limits placed on it by the environment. NOT common

-Graph forms the shape of a “J”

Population Growth: Draw Graph on

either side!Logistic Growth Model

Occurs when the population’s growth slowsor stops, following exponential growth, and stops at the carrying capacity

-Forms an “S” shape

Population Growth

Carrying Capacity The maximum number of individuals in a speciesthat an environment can support long term.

Limited by:-water-food

-physical space-nutrients/ food

What do you think is the carrying Capacity of YOUR house?

Check For Understanding

• Unrestricted populations of organisms experience _____.

1.linear growth

2. biotic growth

3. exponential growth

Human Population Growth

• Demography

• Current population

• The study of human population size, density, distribution, movement, and birth/death rates.

• Today ~7.2 Billion

• By 2050 it is estimated that 9 BILLION humans will be living

THINK-PAIR- SHARE! (3min)

Write down 2 reasons answering the question…..

You may talk to your table group

What are two ways YOU THINK humans have increased the carrying capacity

1. …..

2. …..

Technological Advances

• What are some advances in technology that have helped us increase the carrying capacity?

• Agriculture and domestication of animals has increased food supply

• Technological advances in medicine has reduced the number of deaths

• Improvements in shelter have made humans less vulnerable to climate and natural disasters.

Human population growth rate

What type of growth pattern do we see from 1000 AD to 2025? (exponential or logistical)

Infer…

• What year does the population “dip”?

• How does “modern” population compare to early population?

Exponential; J-shaped

Shift Happens Video

• Write down TWO interesting facts from the video while you are watching it.

http://www.youtube.com/watch?v=YmwwrGV_aiE

Human Population Growth Rate

• How fast is the human population growing now?

• What caused the big dip in 1960

• Even though we are still growing, we are not growing as fast as we used to.

Famine/ starving in china!!!!!

Trends in Population Growth

• Current population trends show that industrial countries have a decreased birth rate.

• These same industrial countries also have a decreased death rate.

• Non-industrialized countries (Africa) show an increase in birth rate.

China and Carrying Capacity

• In fear of their population reaching carrying capacity, China limits the amount of children you are allowed to have.

• Is this ethical?

• Should we implement that here?

Tuesday 5.14.2013 Pick-up: Guided Notes from Front

Bell Ringer:• Compare and

contrast emmigration and immigration. (Draw a Venn Diagram)

Objective:SWBAT: Explain why

biodiversity is important. Explain the various threats to the loss of biodiversity.

1. Vocabulary

a. Biodiversity- is the variety of life in an area that is determined by the number of different species in that area.

2. Types of Biodiversity

High Biodiversity

An ecosystem that has a large variety of plants and animals.

The ocean

Low Biodiversity

An ecosystem that has very little variety of plants and animals.

The Tundra

3. We Practice!

a.Rainforest

b.Desert

c.Wetlands

You Practice

•Take four minutes to work on Practice #6- Biodiversity

•Whatever you do not finish is for homework

The Loss of Biodiversity

• Take three minutes to read and do Cornell Notes on the first section on the back of your notes.

• Stop at Biodiversity at Risk.

• Be prepared to share out loud!

Biodiversity at Risk

• Take three minutes to read and take Cornell Notes on Biodiversity at Risk.

• Stop at Does Biodiversity really matter?

• Be prepared to share out loud

Does Biodiversity Really Matter?

• Take three minutes to read and take Cornell Notes on Does Biodiversity Really Matter?

• Stop at The Value of Biodiversity.

• Be prepared to share out loud

The Value of Biodiversity

• Take three minutes to read and take Cornell Notes on The Value of Biodiversity.

• Stop at Unanswered Question.

• Be prepared to share out loud.

Reflection

• The Unanswered Questions (1 paragraph 4-5 sentences)