13.4-Food Chains and Food Webs
Feb 23, 2016
13.4-Food Chains and Food Webs
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
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.
FOOD WEB
• Interconnected food chains
• Organisms usually have multiple feeding relationships
FOOD WEB • More realistic
display of feeding relationships
• Arrows show transfer of ENERGY