Brainstorm What do you NEED to survive Brainstorm

Brainstorm • What do you NEED to survive? • Brainstorm as many as possible. • Are they the same for all animals?

4 components of HABITAT 1. WATER 2. FOOD 3. SHELTER 4. SPACE

Draw a picture of each in your notes 1. Water 2. Food 3. Shelter 4. Space

LIMITING FACTORS • Something that limits the growth of a population in an ecosystem. • Limiting factors limit the size that a population can reach in a given habitat Examples: availability of water, sunlight, food, grass

Human Population Graph What are the limiting factors for the human population? Can we keep running out of control? What has to happen to limit our population?

CAUSES AND EFFECTS FOREST ECOSYSTEM Causes: There is a drought Effects: Grasses and trees die Deer populations decrease

CAUSES and EFFECTS Ocean Ecosystem Causes: Overfishing by fishermen Effects: Bigger fish populations decline Increase in plankton

CAUSE and EFFECT challenge! 1. WITH A PARTNER, put the cause and effect chains in the correct order (there is 1 cause and 2 effects per scenario). 2. Identify the limiting factors in each scenario (availability of water, food…)

Temperate Forest • increase in herbivore population • lots of plants grow • There were heavy rains *fish population decreases *Company pollutes a lake with runoff from factory *eagle population decreases

African Savannah • grasses die • There is a drought • antelope population decreases *decrease in zebra population *Increase in lion population

Check for Understanding • What is a limiting factor? Provide 2 examples for human population _______________ • What are the 4 essential components of a habitat? ___________

CATALYST 1. What are the 4 essential components of habitat? 2. Identify the limiting factor in the following cause and effect relationship: (*Hint: What did the crows not have? ) -There is a tornado -Corn fields are destroyed -Crow populations decrease

COMPETITION The struggle between individuals for limited resources

Human Population Graph

CARRYING CAPACITY The maximum number of organisms that an ecosystem can support *It is determined by the amount of available resources.

Human Population Graph

What kinds of things can limit our population? 1. What does this graph represent? 2. Is it possible for the human population to keep increasing? 3. If not, why? What things do we need to have enough of for everyone to survive?

PREDICT… • What do you think our human population carrying capacity is on Earth? • There are currently 6 billion

I interpret a population graph

We interpret one together

You interpret one alone • Worksheet

Work time 1. When you are finished, raise your hand to have your work checked.

Let’s create our own graphs….