Warm-Up Where does a producer receive energy from?

THE SUN!!

Review: Interactions in an Ecosystem Level 1: Producer Level 2: Primary Consumers Level 3: Secondary Consumer Level 4: Tertiary Consumer

10% of energy is transferred to the next trophic level

Make your own Label the levels of the food pyramid If you were given the organisms: snake, grass, hawk and mouse Where would they go? Label the levels of the food pyramid If you were given the organisms: snake, grass, hawk and mouse Where would they go?

This is what you should have

Label each organism as a producer or consumer Label each as an autotroph or heterotroph Ex. Hawk in Level 4 is a…. Consumer/Heterotroph

This is what you should have

If level one starts with 4,000 kcal of energy label the energy transferred to each level Remember only 10% of the energy is transferred If level one starts with 4,000 kcal of energy label the energy transferred to each level Remember only 10% of the energy is transferred

4 kcal 40 kcal 400 kcal 4000 kcal

Food Chain Linear flow of energy Ex). Leaves  Slug  Frog  Heron Linear flow of energy Ex). Leaves  Slug  Frog  Heron

Use the food pyramid above and turn it into a food chain. Food Chains always start with the producer!

You should have Grass  Mouse  Snake  Hawk If level 1 has 16,000 kcal of energy label the energy transferred at each level. Grass  Mouse  Snake  Hawk If level 1 has 16,000 kcal of energy label the energy transferred at each level.

Grass  Mouse  Snake  Hawk (16000)  (1600)  (160)  (16) Label each organism as an autotroph or heterotroph as well as a consumer or a producer. Grass  Mouse  Snake  Hawk (16000)  (1600)  (160)  (16) Label each organism as an autotroph or heterotroph as well as a consumer or a producer.

Let’s Practice Looking at Energy Transfer

Agenda Notes on Evaluating Food Webs, Chains and Pyramids Practice- Interpreting Food Webs, Chains and Pyramids Notes on Evaluating Food Webs, Chains and Pyramids Practice- Interpreting Food Webs, Chains and Pyramids

1. FOOD CHAIN If an organism has an arrow going away from it, it is being eaten (Giving energy to another organism) If an organism has an arrow going towards it, it is eating another organism (Receiving energy from that organism) 1. FOOD CHAIN If an organism has an arrow going away from it, it is being eaten (Giving energy to another organism) If an organism has an arrow going towards it, it is eating another organism (Receiving energy from that organism)

The plant is being eaten by the aphid Giving energy to the aphid The aphid is being eaten by the spider Giving energy to the spider The spider is being eaten by the sparrow Giving energy to the sparrow The plant is being eaten by the aphid Giving energy to the aphid The aphid is being eaten by the spider Giving energy to the spider The spider is being eaten by the sparrow Giving energy to the sparrow

2. Food Pyramid Why is the bottom of the food pyramid bigger than the top? It has more organisms and more energy 2. Food Pyramid Why is the bottom of the food pyramid bigger than the top? It has more organisms and more energy

Label the trophic level with the most energy and the least energy.

Label the trophic level with the most organisms and the least number of organisms. 10% or energy is passed to each trophic level, therefore fewer energy and fewer organisms.

3. FOOD WEB Shows interaction between many organisms in an ecosystem

3. FOOD WEB If an organism has an arrow going away from it, it is being eaten (Giving energy to another organism) If an organism has an arrow going towards it, it is eating another organism (Getting energy from that organism) 3. FOOD WEB If an organism has an arrow going away from it, it is being eaten (Giving energy to another organism) If an organism has an arrow going towards it, it is eating another organism (Getting energy from that organism)

If an organism has both arrows (one going away and one going towards it) it is eating an organism and then is being eaten by another organism Example: the Frog

The organism that ONLY has arrows going away from it means: It does not get energy from other organisms Has to get energy from the sun Is, therefore, a producer

Let’s Practice! Determine if each are receiving energy or giving energy:

Grass Giving energy to Mice and grasshoppers

Mice Receives energy from Grass and Grasshoppers and gives energy to Owls and skunks

Grasshoppers Receives energy from the grass and Gives energy to the mice and skunks

Skunks Receives energy from mice and grasshoppers and Gives energy to owls

Owls Receives energy from mice and skunks and Gives energy to NOTHING They are tertiary consumers Receives energy from mice and skunks and Gives energy to NOTHING They are tertiary consumers

Make your own food chain! Rabbits feed on seeds Snakes eat rabbits Hawks eat snakes Rabbits feed on seeds Snakes eat rabbits Hawks eat snakes

Correct answer. Seeds  Rabbit  Snake  Hawk

What would happen to the following animals if seeds were removed? Rabbit? Snake? Hawk? What would happen to the following animals if seeds were removed? Rabbit? Snake? Hawk?

Rabbits would decrease Snakes would decrease Hawks would decrease Rabbits would decrease Snakes would decrease Hawks would decrease

Make your own pyramid Fish feed on Plankton Plankton feed on Algae Sharks feed on Fish Fish feed on Plankton Plankton feed on Algae Sharks feed on Fish

Food Pyramid

What would happen to the other animals if shark became extinct? Fish? Plankton? Algae? Fish? Plankton? Algae?

Practice The tree is an organism in our ecosystem that is being overused. It is used as firewood, paper, lumber and other various duties. Replanting trees is an effort that will increase tree numbers, yet the time to grow the trees cannot keep up with how quickly trees are being cut and used….

Questions How can this decrease in trees affect our ecosystem? People begin to replant trees in an effort to increase the number of tree in our ecosystem. How would replanting trees affect the rest of the other biotic factors of our ecosystem? How can this decrease in trees affect our ecosystem? People begin to replant trees in an effort to increase the number of tree in our ecosystem. How would replanting trees affect the rest of the other biotic factors of our ecosystem?

Practice – Interpreting Food Chains, Webs & Pyramids