Ecology: Chapter 2, Section 1 Energy Flow in Ecosystem
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EACH OF THE ORGANISMS IN AN ECOSYSTEM FILLS ONE OF 3 ENERY ROLES. THE 3 ENERGY ROLES ARE __________, _____________, and ____________
- 1. Producer
- 2. Consumer
- 3. Decomposer
- (Peter can dance)
An organism that can make its own food
Example: Oak Tree
An organism that obtains energy by feeding on other organisms
Example: Bird, fox, owl
Consumers that eat only plants
Example: Rabbit, grasshopper
Consumers that eat only animals
Example: Lion, spider
Consumers that eat both plants and animals
Example: Humans, crows, bears
A carnivore that feeds on the bodies of dead organisms
Example: Catfish, vultures
Break down wastes and dead organisms and return the raw materials to the ecosystem
Example: Mushrooms, bacteria
WHAT ARE TWO WAYS IN WHICH MOVEMENT OF ENERGY THROUGH AN ECOSYSTEM CAN BE SHOWN?
1. Food Chain
2. Food Web
(Frank can find water)
Series of events in which one organism eats another and obtains energy
Consists of many overlapping food chains in an ecosystem
- Example: Grass---Grasshopper---Shrew---Fox
- Combined with the food chain
A diagram that shows the amount of energy that moves from one feeding level to another food web
WHERE IS THE MOST ENERGY AVAILABLE IN THE ENERGY PYRAMID?
AS YOU MOVE UP IN THE ENERGY PYRAMID, EACH LEVEL HAS _____ ENERGY AVAILABLE THAN THE LEVEL BELOW
HOW DOES AN ENERGY PYRAMID GET ITS NAME?
From the shape of the diagram--- wider at the base, narrower at the top
IN GENERAL, ONLY ABOUT ___% OF THE ENERGY AT ONE LEVEL OF A FOOD WEB IS TRANSFERRED TO THE NEXT HIGHEST LEVEL
WHY IS A FOOD WEB A MORE REALISTIC WAY OF PORTRAYING AN ECOSYSTEM THAN A FOOD CHAIN?
The amount of energy available on one level of the energy pyramid is 10 times greater than that available at the next level up
WHY ARE THERE USUALLY FEW ORGANISMS AT THE TOP OF THE ENERGY PYRAMID?
Because so much energy is lost from one level to the next level up, the energy available at the top level can support few organisms
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