Bio 2010 Eutrophication Sustain

8/11/2019 Bio 2010 Eutrophication Sustain

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EutrophicationMans impact on the environment



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..







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.



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



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



Sustainability: Consumption of resource must be

equal or less than nature’s ability to replenish itself



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.



50 acres of rain forest

is destroyed every minute.





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



Documents

Bio 2010 Eutrophication Sustain