Download Interactions Among Living Things

Interactions Among Living
Things
Classifications of animals:
herbivores – animals that eat only plants
carnivores – animals that eat only meat
scavengers – eat dead animals
omnivores – eat plants and animals
Look at the following a/biotic factors…
What do you notice???
ALL OF THESE
lizard
FACTORS INTERACT
hawk
WITH EACH OTHER IN
SOME WAY!!!
bacteria
grasshopper
grass
sun
How would you connect these to show
the interaction?
All organisms need the sun’s
energy to function/live.
So, how does the hawk get
energy from the sun?
It takes it from the lizard.
Where does the lizard get
its energy?
It takes it from the grasshopper.
Where does the grasshopper
get its energy?
It takes it from the grass.
…and the grass gets it energy
from…
THE SUN!!!
How does the bacteria get
energy from the sun?
It gets it from dead plants and animals.
What is a Food Chain?
-the path energy (from the sun)
takes from producer to consumer
to decomposer
-The sun’s energy is passed from
one organism to another.
Do all organisms eat only one
type of food?
NO
Are all organisms eaten by only
one type of animal?
A food chain only shows how
energy passes from one
organism to another.
How do you show how all of the
organisms interact in a
community or an ecosystem?
You must use a FOOD WEB!
A FOOD WEB …
… shows the relationship between all of
the species in a community.
… shows how populations within a
community must compete for food.
… is a map of overlapping food chains.
All food webs start with producers.
Terrestrial Producers
Aquatic Producers
grasses
seaweed
trees
algae
shrubs
They then move to consumers...
The primary consumers
are usually herbivores.
Secondary consumers eat
primary consumers.
Tertiary consumers eat
secondary consumers.
The relationship between predators
and prey is a key part of both
food chains and food webs.
PREY – animals hunted for food
PREDATORS – animals that hunt
other animals
If all food webs begin with
producers, what do all food webs
end with?
DECOMPOSERS
Decomposers break down dead
matter into substances that can be
used by producers.
What do
you notice
about the
arrows in
this aquatic
food web?
How are populations connected?
Let’s say that a farmer uses powerful
insecticides to kills pests that kill their
crops.
What would happen if those same
chemicals killed the harmless ants that
lived in that same habitat?
Look at the diagram below.
What would
happen if the
ants disappeared
from the habitat?
adapt
To adapt to something means to change your
behavior because of your surroundings.
For example, if our school had been hit by the
tornadoes, we would have to adapt to having
classes at another school.
Now that the ants are dying, what can
the lizard do to adapt?
The lizard can
eat other insects.
What will happen to the grasshopper
population then?
The lizards would now be competing
with other animals for the
grasshoppers.
What if the lizards are competing with
birds for the grasshoppers?
You have to understand that when one
animal in a food chain is affected (dies
or multiplies) it will affect not only that
food chain, but it will affect ALL other
organisms in a food web.
So, how do populations adapt
to these changes?
One population might leave its habitat.
The population might begin eating
another organism.