What makes up an ecosystem? Biotic factors

Plants Animals Bacteria Etc.

Abiotic factors Water Light Temperature Soil

What factors can determine population size? Limiting factors are things that can limit

the growth of a population Ex/ amount of space, food and water,

predators, competition (See picture on page 319)

Energy flow in an ecosystem

All energy comes from the SUN!!

Producers – carry out photosynthesis, trapping the sun’s energy to make food

Consumers – feed on other organisms

Food Chains and Food Webs.. Food chains show

a series of events where energy flows through an ecosystem

Food webs show all of the possible ways energy can flow through an ecosystem (links all the food chains)

Energy Pyramids.. Show the amount of energy that moves

from one feeding level to another in a food web

The most energy is available at the producer level As you move up the pyramid, each level has less energy available