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Ecological Problems Questions
Terms in this set (17)
Explain the causes and effects fo the environmental trends from the LW story. Include: Cause for the increase of algae, why the dissolved oxygen is low, effects on the food chain.
During a time of eutrophication tons of green algae grew. Daphnia obsorbed the algae killing the population. The predator of the Daphnia decreased Possum Shrimp. And as algae in the lake died the oxygen levels lowered affecting the other organisms in the ecosystem
Describe the process of eutrophication.
Increase in nitrates and phosphates cause algae growth. Once algea dies it sinks to the bottom. Algea is decomposed causeing the oxygen levels to drop. The fish and other organisms die.
What was the main cause of eutrophication in LW?
The phosphorus from sewage feuled the growth of algea. As the algea dies the oxygen is consumed by the Daphnia who decompose. The smelt and the trout die because of the oxygen depletion.
What causes bioaccumulation and biomagnification.
Heavy metal toxins and other persistent toxins cannot be broken down easily by the organism. Move up the food chain and get more concentrated (Biomagnification)
Over the organisms lifetime, the toxins accumulate. (Bioaccumulation)
Which organisms are mostly affected due to biomagnification?
The tetairy consumers
Why don't all toxins bioaccumulate?
Some toxins are more easily broken down by the organism.
Why is DDT/DDE still affecting ecosystems even though it was banned in the 1970s?
DDT is made with mercury decomposes exstremely slowly so it still exists in the soil and environment.
Describe thermal polution.
Hydroeletric power plants and other mills create thermal electricity. Molecules in the water gain kinetic energy, causing gasses like oxygen to disolve in the water escape. Sensitive organisms like daphnia die due to hot environments.
What causes ocean acidification? What are the effects?
Release of ammisions from cars reacting with CO2+H2O=carbonic acid. The pH level lowers in the water causing sensitive organisms such as microoorganisms and corral are most affected.
What makes a species "invasive"?
Not native to the ecosystem broughr by human actions
How are invasive species introduced?
Spread by: Ballast water, shoes, airplanes, wood trade, to control other species.
What problems do invasive species pose for ecosystems?
Invasive species attack and compete with native organisms and live unapossed.
What causes acid rain? What are the effects?
Emissions release sulfur and nitrogen dioxide. Reacting in the atmosphere and forms an acid. Comes down in the form of rain with a lower pH level.
What causes global warming?
Emissions of CO2 react to create ozone and creates a thick layer around the earth. As the sun raise hits earth the ozone keeps most of the heat in the atmosphere.
(Carbon dioxide, chlorofluorocarbons) Greenhouse gasses act as a insulator and alow less head to escape the stmosphere when it radiates off the earth's surface
How can you prevent or reduce global warming?
Use energy afficiant cars, electricity. Reduce, reuse, recycle.
What is the difference between global warming and global climate change?
Global warming is the heating of the surface and water. Global climate change is the long term effects of global warming.
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