Homework:•Read pages 81B-88B, answer questions 6-13 p 109 B•Finish Unit 4 of EOG packet•Ecosystem interactions & energy resources test 5/1, 4•Review sessions Thursday 4/30 am/pm

Date Session Activity page

4/17, 20 3 Ecosystem Roles and Relationships 5

Relationship StoriesVideo Ecosystems

6

Park Analysis 7

4/21-22 4 Food WebsEcological Pyramids

8

Classwork Quiz 9

Park Analysishttp://www.bbc.com/future/story/20140128-how-wolves-saved-a-famous-park

CHOOSE ONE, PART A:

• Describe the habitat and niche of the Yellowstone Park wolves.

• Describe the habitat and niche of the Yellowstone Park elk.

CHOOSE ONE, PART B:

• Explain how the re-introduction of wolves into Yellowstone Park changed the niche of the Elk.

• Compare and contrast the niche of two populations in Yellowstone park that occupy the same habitat.

8.L.3 Understand how organisms interact with and respond to the biotic and abiotic components of their environment8.L.3.2 Summarize the relationships between producers, consumers and decomposers including the positive and negative consequences of such interactions including •Coexistence and cooperation•Competition (predator/prey)•Parasitism•mutualism8.3.3 Explain how the flow of energy within food webs is interconnected with the cycling of matter (including water, nitrogen, carbon dioxide, and oxygen)

TLW take notes & analyze food webs, ecology pyramids, and the process of biomagnification then complete a class quiz to explain how matter and energy move within an ecosystem.

• http://www.youtube.com/watch?v=cWh-XKhh8xo&feature=fvwp&NR=1

How is “circle of life” a correct description of an ecosystem?

How is “circle of life” an incorrect description of interactions in an ecosystem?

Food Chains show one way that energy and matter move through an ecosystem

Label the trophic levels

Predator?Herbivore?Prey?

Answer discussion questions on page 8

What common elements (matter) are moved from organism to organism?

Do they just move through organisms through consumption?

Source of energy in an ecosystem is the sun

Follow the energy path, then follow the matter path…..what is the difference between them?

http://www.teachertube.com/viewVideo.php?video_id=264005

Page 8

•Create 2 food chains

•ID trophic levels

Page 8

•Create 2 food chains

•ID trophic levels

Another way to show movement of matter or energy………

Pyramid of Energyrepresents the energy available at each trophic level

Rule of 10%...only 10% of energy on lower level is available to the Rule of 10%...only 10% of energy on lower level is available to the consumer above. 90% is used by the organism or released as heatconsumer above. 90% is used by the organism or released as heat..

Show where the other 10% of the energy goes.

Build this foodchain.

Advantages•Most accurate system shows the actual energy transferred and allows for rate of production. Can compare different ecosystems based on relative energy flows.Disadvantages•It is very difficult and complex to collect energy data.

Pyramid of Numberspay attention, we are out of order!!

represents the number of individual organisms available for energy at each trophic level

Advantages•This is a simple easy method of giving an overview and is good at comparing changes in population numbers with time or season.Disadvantages•All organisms are included regardless of their size. So an ecosystem system based on an oak tree would be inverted (have a small bottom and be larger as it goes up trophic levels). Also they do not allow for juvenilles or immature forms. Numbers can be too great to represent accurately.

Pyramid of Biomassrepresents the total mass of living organism matter at each

tropic level

Advantages•Overcomes the problems of pyramids of number re juveniles and immature organismsDisadvantages•Only uses samples from populations, so it is impossible to measure biomass exactly. •Also, the time of the year that biomass is measured affects the result. •Organisms of the same size (mass) do not necessarily have the same energy content.

Pyramid of Biomassrepresents the total mass of living organism matter at each

tropic level

How would the season affect this pyramid’sshape? (think of each level)

Yellowstone Food Web:

Create 3 food chains from this food web

Yellowstone Food Web:

Describe two places you see competition

Yellowstone Food Web:

20,000 kcal energy in algae, how much available to the wolf?

Yellowstone Food Web:

How are terrestrial organisms connected to aquatic organisms?

• Bioaccumulation: Process where plants/animals take up a chemical from the environment and do not excrete it. The chemical builds up in the organisms over time to a potentially lethal level.

• Biomagnification: Higher concentrations of a chemical in organisms at higher levels in the food chain (at higher trophic levels.) As a result the chemical’s concentration is magnified from trophic level to trophic level.

• Available energy decreases as one moves up a food chain, concentration of toxins increases