1. Chapter 5 How Ecosystems Work

2. Section 1 Energy Flow in Ecosystems

3. Energy Flows in Ecosystems
Most organisms depend on the sun for energy.
Producers get their energy from the sun through photosynthesis and then consumers eat those producers.
Photosynthesis:
6 CO H2O (+ sunlight)  C6H12O O2 (+ energy)

4. An autotroph can make its own food.
Producers are also called autotrophs.
Consumers are also called heterotrophs.
An autotroph can make its own food.
Most autotrophs use photosynthesis to get their energy.
Some autotrophs use chemosynthesis to get their energy like the ones that live in deep-ocean ecosystems.
A heterotroph gets its energy by eating others.
A heterotroph breaks down the food it eats and turns it into energy through cellular respiration.

5. What eats what Herbivores eat only plants.
Carnivores eat other consumers.
Omnivores eat both.
Decomposers break down dead organisms.

6. Each step in a food chain is called a trophic level.
FOOD CHAINS
FOOD WEBS
Are a linear sequence showing how energy is transferred from one organism to another
Show the many feeding relationships that are possible in an ecosystem
Each step in a food chain is called a trophic level.

7. Energy Pyramids Producers form the base of the pyramid.
Energy is lost as you move up the pyramid.
Only 10% of the energy goes to the primary consumers, secondary consumers, and tertiary consumers.

8. 1000 kcal

9. That is all for 5.1
Time for quiz 1.

10. Feeding Relationships
Food webs:
Are a model that show the complex network of feeding relationships and the flow of energy within and sometimes beyond an ecosystem.
More realistic path through an ecosystem made of many food chains!

11. Food Web

12. How Ecosystems Work
How Ecosystems Work

13. BrainPop Food Fight Game
Ticket out the Door
Need a scrap piece of paper. Follow the website hints and record the organisms in their appropriate sequence on the food web.
Label producers on the bottom; then primary consumers (herbivores), secondary consumers (carnivores), tertiary consumers, quaternary consumers (4th level).
BrainPop Food Fight Game

14. Section 2 The Cycling of Materials

15. Matter cycles through an ecosystem.
Carbon cycles between the atmosphere, land, water, and organisms. Carbon is the essential component of life.

16. Humans affect the carbon cycle
By burning fossil fuels and cutting down trees.
This could lead to climate change.

17. Summarize HOW does burning fossil fuels affect the carbon cycle?
Adds more carbon into the cycle
HOW does cutting down trees affect the carbon cycle?
Removes carbon sinks from the cycle which leads to an increase in carbon

18. The Nitrogen Cycle
Nitrogen is cycled between the atmosphere, bacteria, and other organisms.
Bacteria plays a very important role in nitrogen fixation and denitrification.

19. Nitrogen cycle could not happen without bacteria!
NITROGEN FIXATION
DENITRIFICATION
When bacteria converts nitrogen gas into ammonia or some nitrate.
When bacteria converts ammonia or nitrate back into nitrogen gas.
Nitrogen cycle could not happen without bacteria!

20. The Phosphorus Cycle
Is the process of moving phosphorus from the environment to organisms then back to the environment.
It happens when rocks erode or ocean sediment makes it back to land.

21. Human affect the phosphorus cycle
Excess use of fertilizers leads to accelerated eutrophication
Burning coal leads to acid precipitation

22. That’s all for 5.2
Time for quiz 2

23. Section 3 How Ecosystems Change

24. Ecological Succession
Is the gradual process of change and replacement of some or all the species in a community.
The hardwood trees show the climax community when all factors are in balance.

25. There are two types of succession
Primary succession happens when there is no life or soil intact.
Examples: Glacier retreats or volcano erupts.
Secondary succession happens when there is some life or soil intact. Examples: Old-field succession that occurs after farmland is abandoned, floods and forest fires.

26. Pioneer Species
Are the first organisms to colonize an area and begin the process of ecological succession
Lichens are an example of pioneer species.
They break down the rock and begin the formation of soil.

27. That is all for 5.3
Time for quiz 3.