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OBJECTIVE: Identify
Different Interactions
among species
 The
ecosystem in which an organism lives.
 physical
and biological conditions in which an
organism lives and how it uses those
conditions.
A
Niche Includes:
 Food:
What it eats and how it’s obtained,
where is it on the food web? What eats it?
 Abiotic Conditions: Non-living things
needed to survive (sun, temperature,
water, salt water, fresh water, heat,
protection, etc.)
 Behavior: When and how it reproduces,
mating rituals, hibernation, defense
mechanisms, interactions with others
 How
is a niche
different from a
habitat?
V
S
 Competition: When organisms attempt
to use an ecological resource at the same
time in the same place.
NO
TWO SPECIES CAN HAVE
THE SAME NICHE AT THE
SAME TIME
 Predation: When one organism captures
and eats another organism.
 SYMBIOSIS
is the interaction between 2 different
organisms living together


HOST- usually the LARGER of the 2 organisms
SYMBIONT- usually the SMALLER member
 Is
a relationship where both species
benefit
 Example:
the the bee feeding on the
nectar helps to pollinate other
flowers
 symbiont
benefits and the host is
neither helped nor harmed.
 The
symbiont benefits by receiving
transportation, housing, and/or
nutrition.
 For example, barnacles receive
transportation from the host
whale. The host whale is neither
helped nor harmed by the
barnacles.

Is a relationship where the Symbiont lives in/on
the Host

The Symbiont (or Parasite) BENEFITS

The Host is HARMED

For example, the tick in the picture above is a
parasite. It benefits by extracting blood from
its human host. The human is harmed because

https://www.youtube.com/watch?v=XuKjBIBBA
L8
 Identify



the relationship as
Parasitism,
Mutualism, or
Commensalism
Oxpeckers
eat ticks on
the
rhinoceros’s
back.
This is an example of:
MUTUALISM
Stork cuts up
dead animals
that it eats
with its beak.
Bees lay eggs
on the
carcasses that
provide food
for the eggs.
This is an example of:
COMMENSALISM
Feed next to
each other
and warn
each other
when
predators
come.
This is an example of:
MUTUALISM
Cowbird
follows the
bison and
eats the
insects in the
grass that the
bison stirs up
This is an example of:
COMMENSALISM
Live on deer
and suck their
blood.
This is an example of:
PARASITISM
Wrasse fish
eats parasites
on black sea
bass.
This is an example of:
MUTUALISM
Attaches to
shark and
eats scraps
from the
shark’s meal.
This is an example of:
COMMENSALISM
Yucca moth
pollinates
yucca plant
and lays its
eggs on the
flower.
This is an example of:
MUTUALISM
The cuckoo
lays its egg in
the Warbler’s
nest and
forces
warblers to
raise chick
This is an example of:
PARASITISM
. Bird shows
badger where
beehive is; badger
breaks open hive
and both eat
honey
This is an example of:
MUTUALISM