
Is this an alligator or a
crocodile?
3 Oct

Agenda



New Seats
Food Chains and webs
Homework

Have a great weekend!
Do any of these vocab. terms look familiar?
Autotroph
 Heterotroph
 Trophic Level
 Producer
 Consumer
 Decomposer
 Herbivore
 Carnivore
 Omnivore

Organism
 Population
 Community
 Food Chain
 Food Web
 Food Pyramid
 Limiting factor

How well do you
remember the levels
of organization?
Populations
-all organisms of the same species living
within an area
 Community
 populations of different species that live
in the same area
Community
Feeding relationships
Ecosystem- communities + abiotic factors

Living (Biotic) factors


all plants & animals living in an area
Physical (Abiotic) factors

soil, rock, temperature, moisture,
sunlight
Ecosystem inputs (td2)
energy flows
through
nutrients cycle
biosphere
Energy flows through ecosystems (Td1)
sun
secondary
consumers
(carnivores)
primary consumers
(herbivores)
loss of
energy
loss of
energy
producers (plants, alga, some bacteria)
Food
Chains
and
Webs
Food chains

Trophic levels



feeding relationships
start with energy from
the sun captured by
producers
all levels connect to
decomposers
Level 4
Tertiary consumer
top carnivore
Level 3
Secondary consumer
carnivore
Level 2
Primary consumer
heterotrophs
herbivore
Level 1
Producer
autotrophs
Decomposers
Bacteria
Fungi
Food webs

Food chains are linked
together into food webs

Try to follow a food chain
through the web
A better
representation
of a real food
web….
North Atlantic
Ocean food web
6 Oct
Opening:
 Algae


beetle larva
minnow
bluegill
pike
Where does all the energy in this food chain come from?
What would happen if minnows were taken out of the food chain?

Agenda



Ecology notes
Efficiency Activity
Homework

none
In the following food web, which organisms would most likely
be a/an:
 producer
A
 consumer
 herbivore
B
C
H
 carnivore
I
D
 omnivore
F
E
G
Feeding levels

How much energy can you
get from food?
 only the energy that is
stored in the organism
 80%-90% energy lost from
one level to next
 food chain can only have 4
or 5 levels Why?
Inefficiency of energy transfer

Loss of energy between levels of food chain

To where is the energy lost? The cost of living!
15%
growth
only this energy
moves on to the
next level in
the food chain
energy lost to
daily living
35%
cellular
respiration
50%
waste (feces)
But what about nutrients?

Energy flows through but
nutrients cycle

nutrients must be recycled to be
available for the next generation

decomposers return nutrients to
the soil after creatures die

fungi

bacteria
n
u
t
r
i
e
n
t
s
decomposers
Use mathematical representations to support claims for the cycling of matter and flow
of energy among organisms in an ecosystem.
Show that matter cycles in an ecosystem...
C6H12O6 +
O2
CO2 +
H2O + Energy (ATP or Light)
Show that energy flows through an ecosystem…
7 Oct
Opening

Agenda





Participation Quiz
Practice energy
Problem
Biological Control
Begin Population Work
Homework

None- Test on Friday
Participation Quiz
1.
2.
3.
4.
5.
All the organisms of the same
species living in an area
An organism that can make it’s
own food
An organism that eats only plant
material
An organism that breaks down
dead material to return nutrients
to soil
An organism that can eat both
animal and plant material
A.
B.
C.
D.
E.
F.
G.
Decomposer
Omnivore
Population
Community
Producer
Carnivore
Herbivore
Practice Energy Problems

If a mouse eats 200 calories of grain, how much of that energy
will be available to the cat that eats the mouse?



E2 = 200 (.15) 
E2= 30 cal
How much of the original 200 cal. Will be available to the
coyote that eats the cat?


E2=E1 (.15)
E3= E2 (.15)  E3 = 30(.15)  E3 = 4.5 cal
If a cat needs 1200 calories a day to survive, how many
calories worth of grain would it take to sustain 1 cat?

E2 = 1200  1200 = E1(.15)  E1= 8000 cal
Strange Days on Planet Earth – Invaders
Biological control – (Min 19- Lake Victoria)
8 Oct
Opening

Agenda



Populations
Limiting factors
Homework

Unit 3 (mini)Exam on
Friday
What controls
populations?
•Availability of
resources
-food, water,
territory
•Predation
•Disease
Human Population Growth

http://www.youtube.com/watch?v=VcSX4ytEfcE
8 Oct
Opening

Agenda



Population Studies
Review
Homework

Test Tomorrow