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TERMINOLOGY
Producer – an organism that makes its own food.
Consumer – an organism that eats another organism for food.
FOOD CHAINS A food chain is a sequence
linking organisms that feed on each other.
Ex. Grass grasshopper frog
snake
TROPHIC LEVELS
Each organism in a food chain occupies a different feeding level, or trophic level.
The 1st trophic level is ALWAYS a producer. It feeds itself by making its own food through photosynthesis.
TROPHIC LEVELS
The 1st consumer or primary consumer is the organism that eats the producer. It is a herbivore.
The 2nd consumer or secondary consumer eats the herbivore. It is the 1st carnivore.
TROPHIC LEVELS
The 3rd consumer or tertiary consumer eats the primary carnivore (secondary consumer).
This trend can continue for multiple trophic levels.
TROPHIC LEVELS
Which trophic level would you occupy if you ate:
o a bowl of cornflakes?o a salmon that just ate a
herbivorous fish?o a steak?
FOOD CHAINSIn our original food chain, each
organism has a specific role(s):- The grass is the producer (1st
trophic level)- The grasshopper is the primary
consumer (2nd trophic level)- The frog is the secondary
consumer AND the primary carnivore (3rd trophic level)
- The snake is the tertiary consumer AND the secondary carnivore (4th trophic level)
FOOD WEBS
A food web is a series of interconnected food chains all drawn in one picture. It shows all possible food chains given a number of organisms.