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Submitted by william86 on June 10, 2008
Category: Social Issues
Words: 284 | Pages: 2
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Investigation of water pollution; comparison of water entering and
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leaving Newquay zoo.
Many causes of pollution contain nutrients such as nitrates and
phosphates. In excess levels, nutrients over stimulate the growth of
aquatic plants and algae. Excessive growth of these types of organisms
consequently clogs our waterways, use up dissolved oxygen as they
decompose, and block light to deeper waters.
This is harmful to aquatic organisms as it affects the respiration
ability or fish and other invertebrates that reside in water.
Pollution is also caused when silt and other suspended solids, such as
soil, wash off ploughed fields, construction and logging sites, urban
areas, and eroded riverbanks when it rains. Under natural conditions,
lakes, rivers, and other water bodies undergo Eutrophication, an aging
process that slowly fills in the water body with sediment and organic
matter. When these sediments enter various bodies of water, fish
respiration becomes impaired, plant productivity and water depth
become reduced, and aquatic organisms and their environments become
suffocated.
Pollution in the form of organic material enters waterways in many
different forms as sewage, as leaves and grass clippings, or livestock
feedlots and pastures. When natural bacteria and protozoan in the
water break down this organic material, they begin to use up the
oxygen dissolved in the water. Many types of fish and bottom-dwelling
animals cannot survive when levels of dissolved oxygen drop below two
to five parts per million. When this occurs, it kills aquatic
organisms in large numbers, which leads to disruptions in the food
chain.
Water was collected from five different sites around the zoo.
1. The stream above the zoo
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