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c.73 Levels of Organization in an Ecosystem

Organism

Ecosystem

Population

Community

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c.74 Exploring a Food Web

Producers

First-levelconsumers

Third-levelconsumers

Second-levelconsumers

Decomposers

Red fox

Woodpecker

Garter snakeShrew

Cottontail rabbitField mouse Grasshopper

Termite

Fungi and bacteriaFungi and bacteria

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78 Primary and Secondary Succession

Primary succession

Secondary succession

Bare rock Pioneer speciesappear

Grassy weedstake root

Tree seedlingsand shrubs appear

Weeds andwildflowersgrow

Pine seedlingsand otherplants take over

Pine forest grows Pine-oak-hickoryforest is developing

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Cold waterpumped down

Magma

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Steam risesto plant

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