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Middle School Science Dr. Kutscher INSTRUCTIONAL POWER POINT ALL LIVING THINGS NEED ENERGY In an ecosystem, an organisms’ role depends on: How it obtains energy & How it interacts with the other living things in the ecosystem Organism’s energy role is: Producer Consumer Decomposer Introducing PRODUCERS It all begins with plants that make their own food….. CONSUMERS CAN BE… •Herbivores eat plants •Carnivores eat animals •Omnivores Eat plants and animals DECOMPOSERS ARE NATURE’S RECYCLERS • BACTERIA • FUNGI • SOME ANIMALS ECOSYSTEMS DEPEND ON THE BALANCE OF THEIR FOOD WEBS •The loss of one organism may tip the delicate balance of survival for many other organisms within that ecosystem. EXPLAIN THE SAMPLE FOOD CHAINS & WEBS THAT FOLLOW: • Which is the PRODUCER? • First level CONSUMERS? • Second level CONSUMERS? • Third level CONSUMERS? • DECOMPOSER? DECIDUOUS FOREST FOOD WEB DECIDUOUS FOREST FOOD WEB The arrows connect the prey (diet) to the predator (consumer). The colored dots on the animals are coded to the colors in the triangular diagram at the upper right. POND FOOD WEB FRESHWATER FOOD WEB