Eutrophic

Alex Wright and Rachel Minkles


 * Eutrophic Lakes**

- Pond Snail - Northern Pike - Yellow Perch - Beaver
 * 1.** Eutrophic lakes can be found in Michigan, mostly in the lower two-thirds of the Lower Peninsula. In fact, eutrophic lakes can be found nearly anywhere.
 * 2.** Eutrophic lakes are rich in plant nutrients and produce a high number of phytoplankton or suspended algae, giving the water a cloudy characteristic. There is a large amount of organic matter produced and much of that organic matter drifts to the bottom of the lake and forms a layer of organic sediment. This organic sediment then becomes food for large number of creatures, which leads to a high population of species. They tend to be shallower than oligotrophic lakes.
 * 3a**. Native Species - Tufted Duck
 * 3b**. Nonative Species - Zebra Mussels. These mussels were found in a lake in Oklahoma and competes with native fish for food and they also damage boats and underwater pipelines.
 * 3c**. Indicator Species - Yellow Perch. The Yellow Perch is one of the mmost common and abundent species in eutrophic lake and can tolerate a wide range of temperatures and can produce many offspring so if there are no or little perch, the lake is in danger.
 * 3d**. Keystone Species - Beaver. The Beaver will dam up streams leading to a lake and this affects the amount of water that is being introduced into the lake, either raising or lowering the water level.
 * 3e**.[[image:http://www.dundeesportsmansclub.com/dundee%20pic/Northern_pike_pic.jpg width="215" height="73" align="right"]] Interspecific Competition Avoidance - Norther Pike and the Muskie. When the Muskie's habitat is invaded by the Northern Pike, they compete for the same weedy wetlands in which they use to breed and lay their eggs. The Pike's offspring would usually hatch before the Muskie, and when the Muskie would hatch, the now larger Pike would eat the younger Muskies. So Muskie has adapted to use different breeding grounds to reduce competition for the wetlands, they can now lay their eggs in the offshore water, usually 3-6 feet deep while the Pike still uses the wetlands closer to shore.
 * 3f**. Predator-Prey Relationship - Northern Pike and the Yellow Perch. The PIke eats mostly any fish species that it can fit in its mouth even the Perch. It will eat the Perch if it must but it avoids having to do so due to the Perch's spiny body but does not mind it.
 * 3g**. Symbiotic Relationship (parasitism) - cercariae. This species is a type of parasitic worm that inhabits fresh water snails. They feed off of the snail's internal organs, then when mature, it is released into the water in search for a new host. [[image:http://www.cdc.gov/parasites/images/shistosomiasis/home_page_image_shistosomiasis.jpg width="233" height="63" align="right"]]
 * 4.**


 * CURRENT EVENT:**

=Delicate balancing act ahead for minister = By Nick Smith  In New Zealand, 64% of lakes are eutrophic. This means that nutrient levels are high and the water is subject to algal blooms and waterways are becoming highly polluted. However, it's hard to set or manage limits on water pollution these days. Big money is potentially involved, but many nay-sayers claim that these eutrophic lakes are a way of life to New Zealanders. And with a tough economy, improving water quality and its allocation is difficult. The New Zealand Government has a tough job in front of it.
 * 5:30 AM Monday Nov 29, 2010 **

http://www.nzherald.co.nz/economy/news/article.cfm?c_id=34&objectid=10690037


 * SOURCES**
 * http://plants.ifas.ufl.edu/guide/eutrop2.html **
 * http://www.mlswa.org/lkclassif1.htm **
 * http://www.microbiologyprocedure.com/aquatic-environment-microbiology/eutrophic-lakes.htm **
 * http://plants.ifas.ufl.edu/guide/trophstate.html **
 * http://earthobservatory.nasa.gov/Newsroom/view.php?id=27010 **
 * http://en.wikipedia.org/wiki/Trophic_state_index **
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 * Living in the Environment: Principles, Connections, and Solutions 14th edition by G. Tyler Miller **