13 4 Food Chains And Food Webs SPONGE

13. 4 Food Chains And Food Webs SPONGE Name a keystone species, and predict what might happen if that species went extinct.

13. 4 Food Chains And Food Webs KEY CONCEPT Food chains and food webs model the flow of energy in an ecosystem.

13. 4 Food Chains And Food Webs • A food chain is a model that shows a sequence of feeding relationships. – A food chain follows the connection between one producer and a single chain of consumers within an ecosystem. GRAMA GRASS DESERT COTTONTAIL HARRIS’S HAWK

13. 4 Food Chains And Food Webs • A food web emphasizes complicated feeding relationships and energy flow in an ecosystem. ENERGY

13. 4 Food Chains And Food Webs At your table please describe these types of consumers: • Herbivores? • Carnivores? • Omnivores? • Decomposers?

13. 4 Food Chains And Food Webs • Consumers are not all alike. – Herbivores eat only plants. Ex: grasshopper – Carnivores eat only animals. Ex: Lion – Omnivores eat both plants and animals. Ex: Bears – Detritivores eat dead organic matter. Ex: Worms, slugs – Decomposers are detritivores that break down organic or dead matter into simpler compounds. Ex: bacteria, Fungi carnivore decomposer

13. 4 Food Chains And Food Webs • Specialists are consumers that primarily eat one specific organism (they only eat one thing) Ex: Bamboo is 99% of a panda’s diet • Generalists are consumers that have a varying diet (they eat a lot of different things) Ex: Gray wolf eats elk, moose, deer, and mice

13. 4 Food Chains And Food Webs • Trophic levels are the nourishment levels in a food chain.

13. 4 Food Chains And Food Webs • Carnivores that eat carnivores Ex: Hawk eating rabbit ENERGY • Carnivores that eat herbivores Ex: Rabbit eating grasshopper • Herbivores that eat producers Ex: grasshopper eating grass

13. 4 Food Chains And Food Webs Omnivores, such as humans that eat both plants and animals, may be listed at different trophic levels in different food chains. • If you are eating a salad you are…. ? • a primary producer (omnivore eating a producer) • If you are eating a hamburger you are…. ? • a secondary producer (omnivore eating a herbivore) • If you are eating shark soup, you are…. ? • a tertiary consumer (omnivore eating a carnivore)