Energy in ecosystems Chapter 1 Section 3 Energy

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Energy in ecosystems Chapter 1 Section 3

Energy in ecosystems Chapter 1 Section 3

 • Energy is vital to all living things • Most energy comes directly

• Energy is vital to all living things • Most energy comes directly or indirectly from the sun • Because energy is continuously used by living things, it must be continuously replaced in the ecosystem • Energy flows through an ecosystem, getting used up as it flows • This is different than the water cycle, where water is recycled and not used up

Producers • Producer – an organism that captures energy and stores it in food

Producers • Producer – an organism that captures energy and stores it in food • Most energy enters an ecosystem through photosynthesis • Plants and other photosynthetic organisms take water and carbon dioxide from their environment and use energy from the Sun to produce sugar.

Producers

Producers

Consumers • Consumer – organisms that get their energy by eating other organisms •

Consumers • Consumer – organisms that get their energy by eating other organisms • Consumers cannot produce their own food, they consume food • Consumers are classified by their position in the feeding relationship • Primary Consumer – eat plants • Secondary Consumer – eat plant eaters • Tertiary Consumer – eat larger plant eaters

Consumers

Consumers

Decomposers • Decomposer – organisms that break down dead plant and animal matter •

Decomposers • Decomposer – organisms that break down dead plant and animal matter • Decomposers are the clean up crew of an ecosystem

Decomposers

Decomposers

Review • Under each word write the following: 1. The definition 2. 3 examples

Review • Under each word write the following: 1. The definition 2. 3 examples 3. Explain where they get their energy from Producer, Consumer, Decomposer

Feeding relationships • Scientists use two different models to show the feeding relationships that

Feeding relationships • Scientists use two different models to show the feeding relationships that transfer energy from organism to organism in an ecosystem • The models are food chains and food webs

Food Chain • Food Chain – describes the feeding relationship between a producer and

Food Chain • Food Chain – describes the feeding relationship between a producer and a single chain of consumers in an ecosystem • This is model for simple feeding relationships

Food Web • Food Web – is a model of the feeding relationships between

Food Web • Food Web – is a model of the feeding relationships between many different consumers and producers in an ecosystem • A food web shows many overlapping and interconnected food chains • It is a better model for the complex feeding relationships in an ecosystem

Food Web

Food Web

Food Web

Food Web

Energy Pyramid • Energy Pyramid – a model that shows the amount of energy

Energy Pyramid • Energy Pyramid – a model that shows the amount of energy available at each feeding level of an ecosystem • The available energy decreases • as it moves through an ecosystem

Energy Pyramid • Usable energy decreases as it moves from producers to consumers making

Energy Pyramid • Usable energy decreases as it moves from producers to consumers making the bottom level the largest • The available energy gets smaller and smaller the farther up the pyramid you go

Energy Pyramid

Energy Pyramid

Review • Answer the 1. 3 review questions on page 28 • Use complete

Review • Answer the 1. 3 review questions on page 28 • Use complete sentences • Questions 1 -3