Science 10
2.1
ENERGY FLOW IN ECOSYSTEMS
Learning Targets
I can
Define primary, secondary, and tertiary consumer
Define herbivore, carnivore, omnivore, and detrivore
Use a food web to explain how the energy is transferred throughout an ecosystem
Use a food pyramid to explain how consumed energy is used
Where do we get energy?
Energy does not stay in one place in an ecosystem – it move through the ecosystem due to
the interactions of different organisms with each other
Each organism
Obtains food energy from the ecosystem
Called energy flow
Contributes energy back to the ecosystem
Levels
1. Producers
Produce __________ using sunlight and _____________
a. Usually Plants
2. Consumers
Consume ____________ to gain energy. There are 3 types of consumers:
I. Primary Consumers
a. Feed on _________________ (___________)
I.e. Grasshoppers, deer, zooplankton
II.
Secondary Consumers
a. Feed on _________________ (___________)
I.e Frogs, song bird, some fish
III.
Tertiary Consumers
a. Feed on _________________ (___________)
b. Top of the food chain
I.e. Hawks, people, bears
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Food Webs
Many animals belong to
more than one _________
________
A food web indicates feeding
relationships within an
ecosystem:
Food Pyramids
When a snake eats a mouse, not all of
the energy from the mouse is stored
and passed on to the hawk that eats the
snake
Most is used for the chemical
reactions that sustain life
Some is lost as undigested
matter
Only a small amount (10%) is
converted into biomass
(__________ _________) that is
transferred to the next trophic
level
Food pyramids show the loss of
energy between trophic levels
Also called ecological pyramids
https://www.youtube.com/watch?v=wGfOoRrICto
Homework:
Energy Flow Worksheet (BC Science 10 SWB pg. 16)
Food Chains Worksheet (BC Science 10 SWB pg. 17)