Presentation on theme: "Where did your dinner come from? With a partner sitting next to you: List the types of food you ate for dinner last night Ex. pizza, cheese, pepperoni,"— Presentation transcript:
Where did your dinner come from? With a partner sitting next to you: List the types of food you ate for dinner last night Ex. pizza, cheese, pepperoni, breadsticks, jello Under each item, write the name of the plant, animal, or other organism that was the source for that food (Some foods have more than one source)
Energy Roles Energy Role: determined by how an organism obtains energy and interacts with other organisms Producer, consumer, or decomposer
Producers Producer: an organism that can make its own food Source of all the food in an ecosystem Most ecosystems obtain energy from sunlight Few ecosystems obtain energy from gas
Consumers Consumers: an organism that obtains energy by feeding on other organisms Herbivores: consumers that eat only plants Carnivores: consumers that eat only meat Omnivores: eat both plants and animals
Decomposers Decomposers: break down wastes and dead organisms and return the raw materials to the ecosystem Nature’s own recyclers Ex. Mushrooms and bacteria
Talk to your neighbor!! What do herbivores and carnivores have in common? What is the role of decomposers? What do you know about ecosystems?
Food Chains and Food Webs Food Chain: a series of events in which one organism eats another in order to obtain energy Producer: first organism- plant First level consumer: second organism, feeds on the producer, herbivore or omnivore Second level consumer: an organism that eats the first level consumer, carnivore or omnivore Third level consumer: eats the second level consumer, also a carnivore
Food Chains and Food Webs A food chain only shows one possible path of energy flow through an ecosystem. Food Web: many overlapping food chains in an ecosystem an organism can play more than one role in an ecosystem Food chains and food webs can interconnect ex. a gull might eat a fish at the ocean and a mouse at a landfill (ocean and land food web)
Share with your neighbor! What energy role is filled by the first organism in a food chain? How can an organism be both a first and second level consumer?
Energy Pyramids How do organisms obtain energy? When an organism eats, it obtains energy. Energy Pyramid: a diagram that shows the amount of energy that moves from one feeding level to another in a food web Most energy is available at the producer level Each level has less energy available
Energy Pyramids 10% of energy at one level is transferred to the next level Where does the other 90 percent go? The other 90% is used for the organism’s life processes or is lost to the environment as heat The amount of energy limits the number of consumers an ecosystem can support.
How does the Energy Pyramid Shape demonstrate the energy available at each level of a food web?
Exit Slip 1. Why do organisms need energy? 2. Where does this energy come from? 3. What is the difference between a food web and a food chain? 4. Define: producers, consumers, decomposers, and energy pyramids.