Freshwater Life Zones
Chapter 7
Less than _________ salt concentration.
FW systems cover less than __________ of earth’s surface.
_______________ from land provides FW zone with ___________ matter, ___________,
and ________________.
Two Types of Freshwater:
1.
2.
Freshwater Life Zones:
1. Littoral zone:
2. Limnetic zone:
3. Profundal zone:
4. Benthic zone:
How do Plant Nutrients affect Lakes?
Lakes are classified according to _________________ and ______________.
Oligotrophic Lake:
Eutrophic Lake:
Cultural Eutrophication:
Seasonal Changes in Lakes:
Thermal Stratification:
1. Epilimnion:
2. Thermocline:
3. Hypolimnion:
In the Fall, surface water _______________ and ___________________ disappears.
Fall overturn:
In the Winter, temp is colder and water separates into different _________________.
In the Spring, surface water ___________________.
Spring overturn:
Streams and Rivers:
Runoff:
Watershed:
Small streams join to form ______________; rivers flow ___________ to the _________.
(this is part of the _____________ cycle)
Stream and River Life Zones:
1. Source zone: cold, clear water from the mountains rushes over ___________
and rapids; dissolves large amounts of ______________; cold water fish and lots of
algae and mosses on rocks.
2. Transition zone: _________ merge to form ____________ streams; fewer
___________; ____________ water supports more producers.
3. Floodplain zone: streams move across _____________; slow-moving; warmer
temp; less dissolved __________; muddy with lots of silt.
Inland Wetlands:
Includes:
What are they important?
Human Impact on Freshwater Systems:
_____ of the world’s rivers are fragmented by ______ and _______ (destroys
wildlife habitats).
Flood control __________ destroy _________ and eliminate __________ (fish
breeding grounds).
In US, ______ of inland wetlands have been _____________ or ___________ and
covered with ________________ for buildings.
How Sustainable are Ecosystems?
Most ____________ end up in the ocean.
Aquatic life zones are constantly renewed because:
1.
2.
3.
This can happen ONLY if _______________ and ______________ do NOT occur!