Transcript Place the following steps in order.

PLACE THE FOLLOWING STEPS IN ORDER.
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A. phytoplankton (algae) multiply, reach a
maximum population, and begin to die off.
B. hypoxic conditions result with fish and other
aquatic animals dying.
C. nutrients enter a body of water and the aquatic
plants living in the water become fertilized.
D. dead phytoplankton settle to the bottom and
become food for decomposers (mainly bacteria).
E. explosive growth of bacteria consume a lot of
oxygen, causing depletion of oxygen in the water
C. nutrients enter a body of water and the aquatic
plants living in the water become fertilized.
A. phytoplankton (algae) multiply, reach a maximum
population, and begin to die off
D. dead phytoplankton settle to the bottom and
become food for decomposers (mainly bacteria).
E. explosive growth of bacteria consume a lot of
oxygen, causing depletion of oxygen in the water
B. hypoxic conditions result with fish and other aquatic
animals dying.
What is the name of this process you just put in
order?
EUTROPHICATION
Eutrophication
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http://www.hippocampus.org/Earth%20Science;jsessionid=B2523513066DA3680
9E569A4C8FB2D90?uak=ipw
HOW CAN EUTROPHICATION BE CONTROLLED?
Attack the growth of vegetation by putting
herbicides into the water, using aeration,
harvesting aquatic weeds, drawing water
down so rooted plants die
 Stop nutrients from being added to the water
by identifying point or nonpoint source
pollutants and then banning them or
educating people about better practices for
fertilizers and other chemicals
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INDICATOR SPECIES
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Specific organisms that may be monitored due to their
sensitivity to water pollution or a specific abiotic factor
(trout – 9-11 ppm: most fish can survive fine in 4-7
ppm)
Benthic macroinvertebrates – aquatic insects, larvae
and crustaceans that live in the bottom portion of a
waterway for part of their life cycle
EX: sensitive - mayfly, stonefly and caddisfly
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Fresh water mussels need DO, loons need clear
water for diving and trout need high levels of
DO and cold waters.
MACROINVERTEBRATES THAT INDICATE POOR
WATER QUALITY
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Leeches, worms, black fly larvae
REMEMBER… TO TEST WATER QUALITY…
Physical tests (temperature, flow velocity,
turbidity)
 Chemical tests (pH, DO, nitrates, phosphates,
and hardness - determines the presence of
some common metal cations such as Mg 2+ and
Ca2+)
 Biological tests - fecal coliform and biological
assessment
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