Biology eutrophication

4. …..EUTROPHICATION

7. Compare these 2 ponds, the bottom
one experiencing eutrophication.

8. When lakes, streams
and estuaries are
over
fertilized, excessive
production of
aquatic
organic matter can
become a water
quality
problem and as a
result the
Eutrophication
process can be
enhanced!

9. However, humans in their everyday activities
can exacerbate the process:
Point sources (can locate the cause)
 Sewage treatment plant discharges
 Storm sewer discharges
 Industrial discharges
Non-point sources (can’t locate the cause,
it’s everywhere)
 Atmospheric deposition
 Agricultural runoff (fertilizer, soil erosion)
 Septic systems

12. 1. Fertilizer flows into water
causing….
2. Increased plant growth on the surface
of
water, causing…..
3. Decreased light in lower levels of water,
causing…
4. Plants in lower levels of water
to die, causing….
5. Decay using up O2 and increasing
CO2,causing…...
6. Death of fish and other animals.
STEPS OF
EUTROPHICATION

14. LACK OF OXYGEN
GROWTH OF BACTERIA
DEATH OF PLANTS
SUFFOCATION
GROWTH OF PLANTS
ADDITION OF NITRATES
Eutrophication process in 6 stages

15. Before increases in nutrients:Before increases in nutrients:

16. Acceleration of Eutrophication :

17. Results of Eutrophication :

18. These fish died due to Eutrophication
removing the oxygen.

20. Photo 1: Algal bloom in a lake.
Algal bloom in a lake.

21. Fish
mortality
due to lack
of oxygen in
an
Indonesian
lake.
Algal
blooms,
otherwise called
"nuisance algae"
or "harmful algal
blooms",
are toxic to
plants and
animals

23. Blue Baby Syndrome - An illness that begins when
large amounts of nitrates in water are ingested by
an infant and converted to nitrite by the digestive
system. He nitrite then reacts with ox hemoglobin
(the oxygen-carrying blood protein) to form
metheglobin, which cannot carry oxygen. If a large
enough amount of metheglobin is formed in the
blood, body tissues may be deprived of oxygen,
causing the infant to develop a blue coloration of
their mucous membranes and possibly digestive
and respiratory problems. This condition is also
known as methemoglobinemia.

24. : Overgrowth of floating aquatic plants.

25. Eutrophication can be avoided by using
minimal required amounts of chemical
fertilizers or better still do away with them and
use natural ones instead. Be sure not to have
the fields close to the water bodies. Take
extra care while using fertilizers during
monsoons as due to run - off, they get
transmitted to the water bodies. Then , they
can cause blockage of water ways, death of
marine life n breakage of food chain.

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