Population Ecology

Tuesday 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. Clumped ex. Individuals live in packs or herds (4-5 wolves live together); school of fish 3. Random ex. Individuals live randomly throughout appropriate habitats

Dispersion

Think, Pair, Share Sp ecies 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 from the population ex. 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 there were 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 slows or 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 species that 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

Bell Ringer: Predict the size of Earth’s (human) population in 100 years. (Why do you think this?) 2 sentences for credit Objective: SWBAT: Identify how the birth rate and death rate effect the rate at which a population changes. Topic: Human Population

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.

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 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)