1. FOOD
CHAINS
TROPHIC
LEVELS
ECOLOGICAL
PYRAMIDS

2. Keep in mind that the arrow tip always points towards the “eater”.
FOOD CHAINS
Food Chain:
is a sequence of feeding relationships describing ______
___________________.
which
organism eats another and how energy is moving
The ____ is the ______________ for food chains.
Sun
source of energy
eagle
Keep in mind that the arrow tip always points towards the “eater”.
snake
eater
frog
grass-
hopper
grass
food

3. FOOD CHAINS Label and write descriptions on your food chain diagram.
There are different levels of consumers…..
eagle
Since they _______ make their own food,
cannot
they must
eat or “________” other organisms.
snake
consume
frog
They form the _____ of all ________ food chains.
basis
grass-
hopper
terrestrial
They use the energy in
_______ to make their
own food
sunlight
grass
through a process called _____________.
photosynthesis

4. FOOD CHAINS Top carnivore:
any organism that is __________ by any other.
not hunted
It’s at the ___ of its food chain.
top
There are different levels of consumers…..
eagle
quaternary consumer
The ___ consumer in a food chain. It eats ________________.
4th
tertiary consumers
snake
tertiary consumer
The ___ consumer in a food chain. It eats __________________.
3rd
secondary consumers
frog
secondary consumer
The ___ consumer in a food chain. It eats ________________.
2nd
primary consumers
grass-
hopper
primary consumer
The ___ consumer in a food chain. It eats _________.
1st
producers
grass

5. Let’s THINK

6. TROPHIC LEVELS Trophic Level:
It is the _______ an organism occupies in a food chain.
position
Each ___ in the chain represents one trophic level.
link
grass
grass-
hopper
frog
snake
eagle
phytoplankton
zooplankton
small fish
larger fish
shark
On land, the first trophic level begins with ______.
plants
In the water, the first trophic level begins with _____________.
phytoplankton

7. TROPHIC LEVELS Trophic Level:
It is the _______ an organism occupies in a food chain.
position
Each ___ in the chain represents one trophic level.
link
grass
grass-
hopper
frog
snake
eagle
phytoplankton
zooplankton
small fish
larger fish
shark
5th trophic level
4th trophic level
3rd trophic level
2nd trophic level
1st trophic level

8. TROPHIC LEVELS
As organisms eat one another, ______ is transferred up the food chain.
energy
eagle
0.1 kcal
However, as energy is moved from one trophic level to the next, only ___ % of the energy makes it to the next level.
- 0.9 kcal 10
snake
1 kcal
- 9 kcal
This 10 % is used to build _______
biomass
frog
10 kcal
as well as to fuel ______________.
bodily functions
- 90 kcal
This means that ___% of the energy is lost, 90
grass-
hopper
100 kcal
mostly in the form of _______
detritus
heat
- 900 kcal
and as ____ from metabolic processes.
grass
1000 kcal

9. ECOLOGICAL PYRAMIDS Ecological Pyramids:
These are diagrams that represent each
trophic level according to its ______ , _______ or _________.
energy
biomass
population
Total energy
present in
tertiary
consumers.
1) Pyramid of Energy:
This pyramid indicates the amount of ______ that is present in each trophic level.
energy
Total energy
present in
secondary consumers.
The amount of energy always _________ as you move up trophic levels.
Total energy present in primary consumers.
decreases
Total energy present in producers.

10. ECOLOGICAL PYRAMIDS Ecological Pyramids:
These are diagrams that represent each
trophic level according to its ______ , _______ or _________.
energy
biomass
population
1) Pyramid of Energy:
This pyramid indicates the amount of ______ that is present in each trophic level.
energy
The amount of energy always _________ as you move up trophic levels.
decreases

11. ECOLOGICAL PYRAMIDS Ecological Pyramids:
These are diagrams that represent each
trophic level according to its ______ , _______ or _________.
energy
biomass
population
2) Pyramid of Biomass:
Total biomass
present in
tertiary
consumers.
This pyramid indicates the amount of _______ that is present in each trophic level, in a given area.
biomass
Total biomass
present in
secondary consumers.
Biomass is the amount of
_________ (without water) within organisms.
dry matter
Total biomass present in primary consumers.
On land, the amount of biomass _________ as you move up trophic levels.
decreases
Total biomass present in producers.

12. ECOLOGICAL PYRAMIDS Ecological Pyramids:
These are diagrams that represent each
trophic level according to its ______ , _______ or _________.
energy
biomass
population
2) Pyramid of Biomass:
This pyramid indicates the amount of _______ that is present in each trophic level, in a given area.
biomass
Biomass is the amount of
_________ (without water) within organisms.
dry matter
On land, the amount of biomass _________ as you move up trophic levels.
decreases

13. ECOLOGICAL PYRAMIDS Ecological Pyramids:
These are diagrams that represent each
trophic level according to its ______ , _______ or _________.
energy
biomass
population
2) Pyramid of Biomass:
Total biomass present in
tertiary consumers.
In the water, the amount of biomass ________ as you move up trophic levels,
increases
Total biomass present in
secondary consumers.
creating an
_______ pyramid.
inverted
This is only possible because the reproductive rate of the organisms ________ as you go down trophic levels.
Total biomass present in primary consumers.
increases
Total biomass present in phytoplankton.

14. Total population of primary consumers. Total population of producers.
ECOLOGICAL PYRAMIDS
Ecological Pyramids:
These are diagrams that represent each
trophic level according to its ______ , _______ or _________.
energy
biomass
population
3) Pyramid of Numbers:
Total population
of tertiary
consumers.
This pyramid indicates the _________ of individuals
at each trophic level.
population
Total population of
secondary consumers.
The typical pyramid of numbers _________ as you move up trophic levels.
decreases
Total population of primary consumers.
This occurs when many _____ and _________ producers feed a ______ number of consumers.
small
numerous
smaller
Total population of producers.

15. ECOLOGICAL PYRAMIDS Ecological Pyramids:
These are diagrams that represent each
trophic level according to its ______ , _______ or _________.
energy
biomass
population
3) Pyramid of Numbers:
This pyramid indicates the _________ of individuals
at each trophic level.
population
The typical pyramid of numbers _________ as you move up trophic levels.
decreases
This occurs when many _____ and _________ producers feed a ______ number of consumers.
small
numerous
smaller

16. Total population of primary consumers.
ECOLOGICAL PYRAMIDS
Ecological Pyramids:
These are diagrams that represent each
trophic level according to its ______ , _______ or _________.
energy
biomass
population
3) Pyramid of Numbers:
Total population
of tertiary
consumers.
However, when the producers are ____ ,
and are _____ in number than the primary consumers,
large
fewer
Total population of
secondary consumers.
the pyramid looks like this.
Total population of primary consumers.
Give an example of the kind of producers that would result in this type of pyramid.
Total population
of producers.

17. ECOLOGICAL PYRAMIDS Ecological Pyramids:
These are diagrams that represent each
trophic level according to its ______ , _______ or _________.
energy
biomass
population
3) Pyramid of Numbers:
However, when the producers are ____ ,
and are _____ in number than the primary consumers,
large
fewer
the pyramid looks like this.
Give an example of the kind of producers that would result in this type of pyramid.

18. The End!