Energy Flow All energy in an ecosystem originates

Energy Flow • All energy in an ecosystem originates from the Sun • Producers obtain energy through the process of photosynthesis • Consumers obtain energy by eating other organisms • Only 10% of available energy gets passed from one organism to another 100% 1% 0. 01%

Food Chains • Energy is obtained by producers from the Sun through the process of photosynthesis • Shows the path of energy from organism to organism • The arrows show the direction of energy flow Direction of Energy Flow

Food Chains Fill in the food chain on your notes page. Grasshopper Mouse Snake Producer 1 st Level Consumer (Primary) 2 nd Level Consumer (Secondary) 3 rd Level Consumer (Tertiary)

Food Chains Create your own realistic food chain using the organisms listed below. Choose 1 producer and 3 consumers. Label each organism. • • Frog Caterpillar Flower Fly • • Owl Leaves Rabbit Fox • • Ant Mouse Lizard Hawk _____ _ _________ _ _________ _

Food Webs • Many overlapping food chains linked together • More realistic diagram of the relationships that occur within an ecosystem • Contains many more organisms than a food chain • A predator from one food chain may be linked to the prey of another food chain

Food Webs Identify 3 food chains that are contained in this food web.

Food Webs 1. Grass Mouse Snake Hawk 2. Grass Rabbit Snake Hawk 3. Grass Mouse Hawk

Food Webs Create your own realistic food web using some of the names of the organisms listed below. Be sure to draw arrows. • Frog • Caterpillar • Flower • Owl • Leaves • Rabbit • Lady bug • Mouse • Lizard • Snake • Fox • Hawk Fox Frog Snake Caterpillar Rabbit Mouse Flower Lady bug Leaves

Energy Pyramids • Shows the amount of energy moving from one feeding level to another • Producers are located at the bottom; top-level consumers are located at the top • The amount of energy available decreases as you move up the pyramid Owls Snakes Mice Grass

Energy Pyramids Fill in the energy available at each level of the energy pyramid. Start with 10, 000 kcal at the producer level. Remember only 10% of available energy gets passed to the next level. 10 Kcal 100 Kcal 1, 000 Kcal 10, 000 Kcal Owls Snakes Mice Grass Kcal = kilocalorie

Checkpoint • 6 checkpoint questions • Discuss each question with a partner • Write a complete answer to each question on your notes page

Question 1 What would happen if the population of snakes decreased rapidly?

Question 2 Is it possible for a food chain to have an infinite number of links? Explain.

Question 3 Examine the food chain below. Is the food chain accurate? Explain.

Question 4 According to the food web below, which organism feeds on the largest variety of organisms? Hawk Fox Frog Snake Caterpillar Rabbit Mouse Flower Lady bug Leaves

Question 5 Identify the organisms that would be considered primary consumers. Hawk Fox Frog Snake Caterpillar Rabbit Mouse Flower Lady bug Leaves

Question 6 Convert the food chain below into an energy pyramid.