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


Competition = fighting
for limited resources
Intraspecific
Competition = within
a species


Ex: songbirds
competing for nesting
sites
Looks like this one lost
the battle!
More Competition

Interspecific
Competition =
between two or more
species

Ex.: douglas fir,
western hemlock,
cedar and alder all
compete for water and
sunlight
Competitive Exclusion
Principle


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
survive


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
Monday!
It can be hand-written or typed (includes
diagrams)
Next Time
11/19-20: smallish unit test
 Modules 14, 19, 21 and any notes (AP level)
Topics:
 Modules 15, 16, 18, 20 (definitions only)
Topics: