about affects of bioaccumulation

1. BIOACCUMULATION
PRESENTED BY:
G.ARJUN (BP211515)
II-M.SC MICROBIOLOGY
SACRED HEART COLLEGE (AUTONOMOUS),
TIRUPATTUR .

2. BIOACCUMULATION
 Bioaccumulation is a process of accumulation of chemicals in an
organism that takes place if the rate of intake exceeds the rate of
excretion. Chemicals are introduced into the organism through exposure
to the abiotic environment (soil, water, air) or as dietary intake (trophic
transfer).
 Bioaccumulation is the gradual accumulation of substances, such as
pesticides or other chemicals, in an organism.

3. CAUSES OF BIOACCUMULATION
 Bioaccumulation occurs when toxins build up - or accumulate - in a food chain. The
animals at the top of the food chain are affected most severely. This is what happens:
Small amounts of toxic substances - often pesticides or pollution from human activity
- are absorbed by plants.
 Bioaccumulation in organisms may enhance the persistence of industrial chemicals in
the ecosystem as a whole, since they can be fixed in the tissues of organisms

4. POLLUTION CAUSE BIOACCUMULATION
 Chemicals such as PCBs, DDT, dioxins, and mercury are all persistent chemicals.
Because they don't break down and go away, these chemicals are a problem when it
comes to fish that we eat. Especially when you consider that these chemicals can also
bioaccumulate, or build up, in fish, wild game, and your body, too.
 Bioaccumulation of pollutants can occur from sea water, from suspended particles, from
sediments and through food chains

5. PREVENTION OF
BIOACCUMULATION
1. Do not put harmful substances (e.g., used motor oil) into the water
system or storm drains. ...
2. Avoid toxic chemical pesticides.
3. Eat certified organic foods when possible. ...
4. Avoid fishing or spending time in contaminated areas.

6. ADVANTAGES OF BIOACCUMULATION
 Bioaccumulation in organisms may enhance the persistence of industrial chemicals in the
ecosystem as a whole, since they can be fixed in the tissues of organisms. Stored chemicals
are not exposed to direct physical, chemical, or biochemical degradation.
DISADVANTAGES OF BIOACCUMULATION
 If bioaccumulators destroy keystone species in an ecosystem, such as predators that control prey
populations, it can lead to the loss or extinction of many species. PCBs, PAHs, heavy metals, some
pesticides and cyanide are all bioaccumulators.

7. ANIMALS AFFECT BIOACCUMULATION
 Synthetic and organic chemicals can affect the nervous, immune, and reproductive
systems of animals. Bioaccumulation of these chemicals can cause birth defects in
offspring or a complete failure to reproduce.
 Bioaccumulation occurs when fish or other organisms take in a substance faster than
their bodies can break it down and eliminate it.
 If a substance can bioaccumulated, even minute and seemingly harmless amounts in
the water can build up to toxic amounts inside the body.

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