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What makes up an ecosystem? Biotic factors
Plants Animals Bacteria Etc.
Abiotic factors Water Light Temperature Soil
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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)
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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
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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)
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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