Download - Our endangered waters andee
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OUR ENDANGERED
WATERS
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Any physical, biological, or chemical change in water
quality that makes it unfit for its desired purpose can be
considered water pollution. The amount of oxygen in the water is a good indicator of water quality
as it determines if water can support various life forms.
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There are two ways to monitor water quality:• Biological oxygen
demand (BOD)• Dissolved oxygen content
(DOC)
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Presence of Infectious
Agents
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A serious water pollutant is disease-causing organisms. These pathogens
may bring cholera, typhoid fever, hepatitis, bacterial and amoebic
dysentery, polio, and schistosomiasis.
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Vectors are organisms that carry or transmit disease-
causing organisms. Malaria, yellow fever, and filariasis are examples of
illnesses carried by animal vectors.
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Eutrophication
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The transparency of water is affected by the presence of
sediments, nutrients, chemicals, and population of planktons.
Freshwater environments, that are clear but with low biological
productivity are said to be oligotrophic.
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Waters that are “nutrient-rich” are called eutrophic waters.
Eutrophication may occur in freshwater or even in marine
ecosystems especially near the shore, enclosed bays, and
estuaries.
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Toxic Inorganic Chemicals
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The weathering of rocks may release small amounts of toxic inorganic
materials, which are then carried by runoff to other bodies of water. Heavy
metals, which rank as the highest among the persistent toxic inorganic substances, tend to accumulate in
food chains where humans are at the top. This process of bioaccumulation
is known as biological magnification.
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Organic Chemicals
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There are thousands of different synthetic and natural
chemicals that are used to manufacture pesticides,
plastics, drugs, and a wide array of other everyday materials. Many of these
chemicals re highly toxic and exposure to these substances
may cause birth defects, cancer, and other genetic
disorders.
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Sedimentation and Siltation
Rivers have always carried loads of sediment into
bodies of water. Sometimes, sediments clog the tiny
holes of corals through a process called siltation.
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Thermal Pollution
The increase or drop in “normal” water temperature can affect water
quality and aquatic life. Aquatic organisms need a fairly constant
temperature to survive. They poorly adapt to rapid temperature changes
and may perish when sudden temperature changes happen. A one-
degree decrease in temperature in tropical oceans may even be fatal to
some corals and other reef organisms.