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ENERGY FLOW THROUGH AN ECOSYSTEM
1. Sun
2. Autotrophs
3. Heterotrophs
4. Decomposers
ENERGY IS NOT
RECYCLED!!!!
ALL LIVING THINGS NEED ENERGY The sun is the original source of energy for
most ecosystems.
All organisms in an ecosystem can be divided into one of two groups based on how they get their energy:Autotrophs Heterotrophs
AUTOTROPHSAKA
PRODUCERS
Organisms that make their own food from light or chemical energy.
Include:Plants AlgaeSome bacteria
HETEROTROPHSAKA
CONSUMERS Organisms that eat other organisms to get
the energy they need to survive. Include:
HumansFishMushrooms
DETRITIVORES Organisms that feed on small pieces of dead
plants and animals. Ex: worms and roly polies
DECOMPOSERS Organisms that use digestive chemicals to
break down dead organisms Ex: Fungus (mushrooms and mold), and some
bacteria
In order for an ecosystem to survive, there must be a perfect balance of autotrophs, heterotrophs, and decomposers.
A BALANCED ECOSYSTEM
WHY IS EACH GROUP NECESSARY?
The autotrophs make oxygen and food for the heterotrophs.
The heterotrophs produce carbon dioxide for the autotrophs and waste for the decomposers.
The decomposers break down the animal waste and dead organisms and produces carbon dioxide for the autotrophs.
FOOD WEB A complex diagram that shows all possible paths of energy through an ecosystem.Basically shows how all the food chains in an ecosystem connect to each other.
TROPHIC LEVEL & ENERGY LOSS
Trophic Level = each step in a food chain or food web
Each trophic level depends on the level below it for energyOnly 10% of the energy is passed from one trophic level to the next.
WHAT IS BIOMASS? The total amount of living tissue within a trophic level
A biomass pyramid represents the amount of potential food available for each trophic level