13.4-Food Chains and Food Webs
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13.4-Food Chains and Food Webs
description
13.4-Food Chains and Food Webs. FOOD CHAIN. Single sequence that links species by their feeding relationships. T races the transfer of energy Simplest way to look at energy flow in an ecosystem. Trophic Levels. level in a food chain 1. Producers always first level - PowerPoint PPT Presentation
Transcript of 13.4-Food Chains and Food Webs
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13.4-Food Chains and Food Webs
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FOOD CHAIN • Single sequence that links species
by their feeding relationships.• Traces the transfer of energy• Simplest way to look at energy flow
in an ecosystem
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Trophic Levelslevel in a food chain1. Producers always first level
2. Primary consumers next level (herbivore)
3. Secondary consumer- eat herbivores (small carnivore or omnivore)
4. Tertiary consumer-carnivores that eat secondary consumers.
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FOOD WEB
• Interconnected food chains
• Organisms usually have multiple feeding relationships
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FOOD WEB • More realistic
display of feeding relationships
• Arrows show transfer of ENERGY