APES Unit 11

Food Web

Shows how matter and energy flow through an ecosystem, from organism to organism

When one organism preys on another, the matter (C/N/H2O/P) and energy (glucose, muscle tissue, etc.) are…

Passed on to the predator

Arrows in food webs indicate…

Direction of energy flow (point other organism taking in the energy)

Food chains

Just show one,linear path of energy and motion.

Food webs have at least 2 different…

Interconnected food chains

Webs show that organisms can exist at…

Different trophic levels

Food webs show how increase or decreases in population size of a given species can…

Impact the rest of the food web

Trophic Cascade

Removal or addition of a top predator has a ripple effect down through lower trophic levels

Decline in wolf population means an increass in deer population which leads to overgrazing and decline in trees

Trophic Cascade