APES 10/8 and 10/9
Please take out your Mono Lake
assignment for stamping
 Get a laptop
 I won’t be returning your quizzes today
as I still have 8 students who need to
take it….I’ll update Skyward in the next
2 days with your score 

Mono Lake FRQ
Read the provided answer key
 In a different color, add the key points
that you’re missing
 This is an example of FRQ #3 or #4 on
the APES test

Learning Targets
I can analyze the ecological effects of
reduced (and then increased!) water
flow into a terminal lake.
 I can take baseline measurements of the
abiotic components of my ecosystem.
 I can correct apply aquatic biome
definitions to my ecocolumn.

EcoColumns, Day 2
Goal = get through step 14
 Step 10 says to let water drain overnight. You
can still collect and test a water sample today
as it drains.
 Baseline Measurements

 Dissolved oxygen, pH, nitrite, phosphate levels of
the bottom water level
 Temperature of water
 Adjustments to ecocolumn (record what is initially
in there)
EcoColumns, Day 2
No need to tape your ecocolumn unless
it is unstable.
 Place it on the grow cart (labeled!)
 Clean Up!

 Wipe up spills (water, soil, etc.)
 Return all items neatly to the cart
 Throw away paper towels, etc.
 Clean off lab stations with Clorox Wipes
Freshwater
Communities
Let’s learn more about
what we are trying to make
a heavily-linked terrestrial
and freshwater ecosystem!
Biomes: Aquatic Communities
Freshwater Communities:

Freshwater habitats; lakes,
ponds, streams and rivers, are
very limited in area.

Lakes cover only about 1.8
percent of the earth’s surface and
rivers only .3 percent.

All freshwater habitats are
strongly interconnected to
terrestrial (land) habitats.
Biomes: Aquatic Communities
Freshwater Communities
 Many kinds of organisms are restricted to freshwater
habitats; including plants, fish, and a variety of arthropods,
mollusks, and other invertebrates too small to be seen by
the naked eye.
Food web showing overlap
of aquatic and
terrestrial communities
Biomes: Aquatic Communities
Freshwater Communities:

Ponds and lakes have three
zones in which organisms live.

The littoral zone is a shallow zone
near the shore.

Here aquatic plants live along
with various predatory insects,
amphibians and small fish.
Biomes: Aquatic Communities
Limnetic Zone:

The limnetic zone refers to the
area that is farther away from
shore but close to the surface of
the water.

It is inhabited by floating algae,
zooplankton, and fish.
Biomes: Aquatic Communities
Profundal Zone:
 The profundal zone is a deep
water zone that is below the limits
of light penetration.
 Not all freshwater systems are
deep enough to have a profundal
zone.
Biomes: Aquatic Communities
The Benthic Zone
 The Benthic Zone is the “soil” of a
freshwater or ocean ecosystem
 It contains billions of benthosinsects and decomposers that
break down nutrients and recycle
them
Biomes: Wetlands



Swamps, marshes, bogs and
other communities that are
covered with a layer of water are
called wetlands.
Typically covered with a layer of
water-tolerant plants called
hydrophytes (ex: marsh grasses,
cattails)
Wetlands are diverse
environments that support a
variety of invertebrates, birds,
and other animals.
Biomes: Wetlands

Wetlands are among the most
productive ecosystems on Earth,
exceeded only by coral reefs in
their diversity and concentration
of species.

Wetlands also provide a key
ecological service: water storage
basins that moderate flooding,
allowing a safe zone that can
hold waters when periods of
heavy precipitation occurs.
Biomes: Wetlands
Wetlands:
 Many wetlands are
being disrupted by
human development as
urban communities
expand.
 New developments are
required to avoid
wetlands, and build their
own water storage
systems
Check for Understanding
Which of these terms apply to your
ecocolumn?
Sketch your ecocolumn in the Lab section of
your lab book. Label it with the appropriate
terms:

littoral zone
limnetic zone
benthic zone
benthos
freshwater
marsh/bog
profundal zone
terrestrial
wetlands
Upcoming Homework
Chapter 3 Reading AssignmentTake notes on chapter 3, plus answer all
end of module and end of chapter multiple
choice.
Define any terms not already included in
your notes
Due date: Wed., 10/14 (blue); Thurs.,
10/15