APES 11.17 and 18
Choose a new seat not next to your Ecocolumn group members
Please take out your Current Event and
Bubble Lab
No Warm-Up Today
Bubble Lab Recap- 5 minutes
Please compare graphs and analysis
answers with your new group
Turn it in!
Current Events
Take turns sharing your current event
Key points
Local, national, global?
Why care?
How does it relate to APES?
Be prepare to share in a large group as well.
Learning Targets
Ecosystem Roles
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.
Niche VIPs
Indicator species = provide an early warning
that damage to an ecosystem is occurring
Very sensitive to abiotic factors
i.e. amphibians (dependent on water and landexposure to pesticides, etc.)
Keystone species = have a disproportionate
negative effect when they go extinct
i.e. pollinators like bees, predators like alligators
that keep lower level consumer pops in check
Competition = fighting
for limited resources
Competition = within
a species
Ex: songbirds
competing for nesting
Looks like this one lost
the battle!
More Competition
Competition =
between two or more
Ex.: douglas fir,
western hemlock,
cedar and alder all
compete for water and
Competitive Exclusion
Competitive Exclusion Principle = no two
species can occupy the same niche in the
same place
One species will out-compete the other,
leading to evolution or extinction
Natural E. coli out-competes foreign bacteria
in your stomach, keeping you
healthy…unless the foreign bacteria wins!
Then you get food poisoning 
Range of Tolerance
A range of tolerance is an optimal range of
abiotic conditions where a species can
Conditions = temperature, salinity, pressure, light,
Decides which organisms survive where
Range of Tolerance
Ex.: salmon can only live in cool, fast-running water.
When dams are built, water becomes stagnant and
warm, killing salmon
Final EcoColumn Measurements
Measure pH, temp, nitrate, phosphate,
dissolved oxygen
Record if they are at healthy levels
Make final measurements of plants
Deconstruct OUTSIDE
Dump off water
Return plants/slugs to foresty area
Throw in dumpster
Got a fish? See me.
Eco-column Analysis
Find the document called “Eco-column
Analysis” on my website (labs page)
Your INDIVIDUAL final analysis is due
It can be hand-written or typed (includes
Next Time
11/19-20: smallish unit test
 Modules 14, 19, 21 and any notes (AP level)
 Modules 15, 16, 18, 20 (definitions only)