D.N.AObjective: SWBAT analyze an ecosystem’s energy

flow through food chains and food webs

1. What is the difference between a producer and a consumer?

2. Herbivores are what kind of consumers?

3. Carnivores have to be at least this level of consumers

•Producers are able to produce their own food and energy•Consumers depend on others for food

PRIMARY CONSUMERS

SECONDARY CONSUMERS

What does the prefix

“auto” mean?

As in AUTOPILOT!

SELF Nourishment(feeding)

What are examples of organisms that

make their own food (AUTOTROPHS)?

Autotrophs are also known as Producers

How do autotrophs produce their own food?

Energy fromThe SUN!

Deep sea bacteria live at ocean depths too

great for light to reach, thus

photosynthesis cannot occur. Yet, these

bacteria still make their own food

(sugars). What is this process called?

What if there is no sunlight?

Chemosynthesis

What does the prefix

“Hetero” mean?

Other Nourishment(feeding)

What are examples of organisms that eat other organisms (HETEROTROPHS)?Heterotrophs are also known

as Consumers

Basic Food Chain• Arrows show the

movement of energy

• In this example energy flows from the sun to the plants to the rabbit to the owl.

FOOD WEBS• Multiple Food Chains connected together• Shows how organisms relies upon others

for survival and energy

Energy in Ecosystems

Ecological Pyramids-a model which shows how energy flows through an ecosystem.

Pyramid of EnergyHeat

Heat

Heat

Heat

0.1% Consumers

1% Consumers

10% Consumers

100% Producers

Parasites, scavengers, and

decomposers feed at each

level.

Energy decreases at each trophic level.

Only 10% of the energy is passed up each level!

GUIDED PRACTICE

Eagles

Snakes Rabbits

Grasses

Field Mice

Weasels

1.Identify the…

a. Producer(s)

b. Primary Consumers(s)

c. Secondary Consumers(s)

Trees and Grass (Level A)

Elk, Rabbit, Mouse, Frog, Cricket (Level B)

Lion, Snake, Hawk (Level C)

If the field mice were eliminated due to farming, what organisms would be greatly affected? Why?

•The snake and hawk because they depend on the mouse for food

•Larger population of crickets

If the Elk were to go extinct, would the mountain lion be affected?

 

How might the mountain lion deal with losing this source of energy?

  How might this affect the other organisms in the food web?

Yes, because it needs the Elk for food

The mountain lion will eat more of the rabbits

The hawk is losing a source of food if the mountain lion eats more of the rabbits

Under the Sea! – Marine Food Web Activity

1. Get into a group of 42. Each team is given a game board, trophic

level chart, organisms pictures, one pair of scissors, and a glue stick

3. You have 20 minutes to correctly place the organisms on the game board using the clues on the trophic level chart!

EXIT TICKET!

HOMEWORK – FOOD WEB POSTER!Due October 12

• Must contain at least 8 organisms• Found in the same ecosystem (pond, desert, rainforest, ocean)

– Energy source (sun)– Producers, Primary Consumers, Secondary Consumers,

Tertiary Consumers, one Decomposer• Properly labeled using vocabulary words• Trophic levels are identified• Transfer of energy is shown in the right direction (arrows)

RACE TO THE HSA

RACE TO THE HSA• Each class will start off with 10 points for

the day• Points will be deducted if the class is not

following our classroom norms• The class with the most points at the end of

each month will win!

RACE to the HSA

• What type of prizes will be offered?– Breakfast party– Pizza party– Icecream social– Field Trip– Guest Speakers