Ecosystem Dynamics: The Food Web Explained
Warm Up: 2/23/2016
What is a community?
Organisms living together in an
ecosystem
Energy Flow
Food Chains
Every living thing needs energy in order to live.
A representation of the feeding of one organism
upon another in a sequence.
In other words…
A food chain shows how each living thing gets
food, and how nutrients and energy are passed
from creature to creature.
Grass
Grasshopper
Frog
Snake
Hawk
Food Web
The representation of many connected food
chains
Each food chain within the web represents one
possible path that energy and nutrients may
take
It shows the relationships within a community
Trophic Levels
What is a trophic level?
The feeding position in a food chain or food web
1
st
level – Producer
Makes its own food
Example: plants
2
nd
level – Primary Consumer
Consumes producers
Ex: mice eat plant seeds
Trophic Levels
3rd level – Secondary Consumer
Consumes primary consumers
Ex: snakes eat mice
4
th
level – Tertiary Consumer
Consumes secondary consumers
Ex: hawks eat snakes
Food Pyramid
A diagram in which each trophic level is represented by a
block, and the blocks are stacked on top of one another, with
the lowest trophic level on the bottom.
A representation of the energy flow as it moves from one
level to another
The energy stored by the organisms at each trophic level is
about 1/10 the energy stored by the organisms in the level
below.
This is why it takes the shape of a pyramid
.
Activity
I need 4 volunteers
Each volunteer will pick
one organism to represent
Organize the organisms
into the correct order to
create a food chain.
( Arrange yourselves in the
correct order )
Time to Practice
http://www.sheppardsoftware.com/content/animals/kidscorn
er/games/foodchaingame.htm
Activity
Complete the worksheet
Make sure your name is on your paper
Be prepared to share and discuss
An ecosystem comprises various organisms living together in a community. Energy flow through food chains depicts how organisms obtain energy and nutrients from one another. Food chains show the sequence of feeding relationships, while a food web illustrates interconnected chains within a community. Trophic levels categorize organisms based on their feeding positions, from producers to tertiary consumers. A food pyramid represents energy flow efficiency across trophic levels, with each level storing about 1/10 of the energy from the level below. Engage in an interactive activity to understand the organization of organisms in the context of a food chain.
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Presentation Transcript
Warm Up: 2/23/2016 What is a community? Organisms living together in an ecosystem
Food Chains Every living thing needs energy in order to live. A representation of the feeding of one organism upon another in a sequence. In other words A food chain shows how each living thing gets food, and how nutrients and energy are passed from creature to creature. Grass Grasshopper Frog Snake Hawk
Food Web The representation of many connected food chains Each food chain within the web represents one possible path that energy and nutrients may take It shows the relationships within a community
Trophic Levels What is a trophic level? The feeding position in a food chain or food web 1stlevel Producer Makes its own food Example: plants 2ndlevel Primary Consumer Consumes producers Ex: mice eat plant seeds
Trophic Levels 3rd level Secondary Consumer Consumes primary consumers Ex: snakes eat mice 4thlevel Tertiary Consumer Consumes secondary consumers Ex: hawks eat snakes
Food Pyramid A diagram in which each trophic level is represented by a block, and the blocks are stacked on top of one another, with the lowest trophic level on the bottom. A representation of the energy flow as it moves from one level to another The energy stored by the organisms at each trophic level is about 1/10 the energy stored by the organisms in the level below. This is why it takes the shape of a pyramid.
Activity I need 4 volunteers Each volunteer will pick one organism to represent Organize the organisms into the correct order to create a food chain. ( Arrange yourselves in the correct order )
Time to Practice http://www.sheppardsoftware.com/content/animals/kidscorn er/games/foodchaingame.htm
Activity Complete the worksheet Make sure your name is on your paper Be prepared to share and discuss
