Download Tomato hornworm hosting wasp larvae Clown fish

Today:
• Stamp Typed rough draft
• Peer Edit
• Notes: Competition within a community
• Final Draft of lab reports are due Monday
beginning of class with the following items
– Final Draft
– Peer Edit
– Typed/Stamped Rough Draft
• Upload to turnitin.com by Thurs., Nov. 20
by midnight
Section 4.2:
A Look Inside
Communities
Tomato hornworm hosting wasp
larvae
Clown fish gets a home; Sea
anemone has no bugs!
Review Time!!!
Q: What is a community?
A: A collection of populations living
together
Q: What is an ecosystem?
A: Community plus non-living factors
Biotic and Abiotic Factors
• Together, biotic and
abiotic factors
determine the
productivity of
organisms and where
the live (their habitat)
The Niche
• Niche = an organism’s role in an
ecosystem
• Ex: mushrooms are decomposers living on
tree stumps
• Analogy: baseball players
can be pitchers, catchers,
shortstops, etc.
In Your Composition Notebook
on a separate page…
a. What is your niche at Eastlake?
b. What abiotic factors do you encounter?
c. What biotic factors do you share your
community with?
Community Interactions
• No two organisms can have the same
niche; one will always outcompete the
other
• This is the competitive exclusion principle
• Competition = two organisms trying to use
the same resources at the same time
• Resources = food, water, shelter, mates,
etc.
Community Interactions
• Predation = one organism captures and
feeds on another
• Symbiosis = two species live and interact
closely together
Types of Symbiosis
• Mutualism: both species benefit from the
relationship
• Example: bees pollinating flowers
Types of Symbiosis
• Commensalism: one species benefits,
while the other sees no effect
• Example: barnacles on whales
Types of Symbiosis
• Parasitism: one species benefits, while the
other suffers
• Examples: tape worms in your stomach
Your turn- discuss as a group:
• Give an example of the following community
interactions, using examples from here at EHS.
–
–
–
–
–
Predation
Symbiosis
Mutualism
Commensalism
Parasitism
• Write your responses in your composition book, under
where you put down biotic and abiotic factors you
encounter
• Reminder- Final Draft due Monday
• Quiz on Sec. 4.2 on Thursday
• Start Fred Hutch Kit- micropipetting on
Monday, finish Thursday