Download Week 2-3 Notes File

New Notes Title:
Community Interactions
Do now 1/20

Name 1 of the 4 types of symbiosis.
DO NOW 1/21

Give an example of Predation in a Desert
Ecosystem.
DO NOW 1/22


Which is the most interest symbiotic relationship and
why?
Parasitism Predation Mutualism or Commensalism
Agenda/ To Do List 1/22

Finish Symbiosis Worksheets 1 & 2

Take Pre-Test # 9-17 and 27-31

Finish Ecosystem (Populations) Research
How do organisms interact with one
another in an Ecosystem?

Symbiosis explains how two organisms interact with
one another, there are many types of symbiotic
relationships or ways organisms interact.
1) Predation
When one species the predator hunts another
species, the prey
EX: Owls prey on mice
2) Parasitism
One species (parasite) obtains energy by living off
of another species.
EX: Tapeworms live in the intestines of a dog,
absorbing nutrients from the food it eats
3) Mutualism
Two species work together, each benefiting from
the relationship
EX: Bees gather nectar (their food) from flowers
and then spread the flowers pollen so that the flower
can reproduce.
4) Commensalism
One organism benefits and the other is neither
helped or harmed
EX: Monarch larva feed on milkweeds which
contain a chemical that is poisonous to birds.
What is Competition in an
Ecosystem?
When two or more species compete for the same
resource (food).
EX: A lot of birds and a squirrel fighting for the
same nuts, and there is only enough to feed one
species
1) Species divide smaller
resources instead of
competing for them.
What is the
impact of
Competition?
2)When two species are
competing for a limited
food source/resources,
eventually one of the
competing species will die
out. This is known as the
Competitive Exclusion
Principal
Competitive
Exclusion
Principal
States that no two
species can occupy the
same niche in the same
habitat at the same
time. Either one species
will become extinct or
the other species will
evolve to fit a new
niche.
Organisms obtain energy from living
(biotic) and non-living (abiotic) things in
their environment.
How an organism obtains its energy nutrients
is important because it tells us how energy is
used.
In an Ecosystem energy is used by
Producers
Describe
relationships in
an Ecosystem.
Consumers
Decomposers