bio 2010 eutrophication sustain
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EutrophicationMans impact on the environment
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Objectives
All organisms cause changes in their environments, and these
changes can be beneficial or detrimental. Especially, Humans are
some of the most powerful change agents to an environment and
that can upset the delicate balance of an ecosystem.
Changes in the environment can have different effects on different organisms..
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Definition
Eutrophication is an increase in the concentration of chemical nutrients in anecosystem to an extent that increases in the primary productivity of the
ecosystem. Depending on the degree of eutrophication, subsequent negative
environmental effects such as anoxia and severe reductions in water quality,
fish, and other animal populations may occur.
Eutrophication is a process whereby water bodies, such as lakes, estuaries, orslow-moving streams receive excess nutrients that stimulate excessive plant
growth (algae, periphyton attached algae, and nuisance plants weeds). This
enhanced plant growth, often called an algal bloom, reduces dissolved oxygen
in the water when dead plant material decomposes and can cause other
organisms to die. Nutrients can come from many sources, such as fertilizers
applied to agricultural fields, golf courses, and suburban lawns; deposition of
nitrogen from the atmosphere; erosion of soil containing nutrients; and sewage
treatment plant discharges. Water with a low concentration of dissolved oxygen
is called hypoxic.
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Sustainability
• Sustainable development is a process of developing land, cities,
business, communities, and so on that "meets the needs of the present
without compromising the ability of future generations to meet their own
needs”
• (UN report 1987)
• Providing for today without effecting the provison
of the resource in the future
• Using a resource at a slower rate than its
creation
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Objectives
• All organisms cause changes in their environments, andthese changes can be beneficial or detrimental.
Especially, Humans are some of the most powerfulchange agents to an environment and that can upset thedelicate balance of an ecosystem
Knowledge and Skills • Discuss the importance of sustainable development
• Discuss the moral obligations of man in conservationand environmental protection
• Develop an awareness of personal lifestyle impact onthe environment
• Adopt a stand towards sustainability and conservationand be able to hold discussions using specific examplesto justify their claims
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Sustainability: Consumption of resource must be
equal or less than nature’s ability to replenish itself
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Grand Banks, Canada, North Atlantic
•50 years ago, cod abundant•Early 20th century, factory trawlers used.
•These vessels can net, fillet and freeze
enormous amounts of fish.
•Cod disappeared after a few decades of
such fishing.
•In 1992, Canadian Government imposed a
ban on cod fishing. However, cod
population did not recover for the past 11
years.
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further readings
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Time required for nature to form 1 inch of topsoil
= 200 to 1000 years.
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50 acres of rain forest
is destroyed every minute.
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Earth lit up at night, as seen from space
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possible solutions
• set quotas
• limit use of harmful technology
• aquaculture• education - switching consumer’s diet
• impose minimum size/age caught (ensure
young mature into adults for continuedreproduction)
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• New water
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