SCI203 Lab5_worksheet_ Phase 5 I P Carl Steen
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In this lab, you will determine how an invasive species—the
zebra and quagga mussel—affects other species in the freshwater lake. Use the
animation to help you come up with an answer to the following: •Why do you see
increases and decreases in the invasive species population? •What are the
implications associated with these alterations to the ecosystem as a whole?
The Effects of Zebra and Quagga Mussels Introduced into a
Freshwater Lake
As you have learned, population dynamics are caused by the
biotic potential of the population and the effects of environmental resistance.
When there is minimal environmental resistance impacting a population, it will
exhibit a population explosion. One reason for minimal resistance could be
factors that no longer regulate a population (e.g., predator decline or
resource increases). Another reason for a population explosion is the
introduction of an invasive species. Invasive species are species foreign to an
ecosystem and are not immediately regulated by the environmental restraints of
the particular ecosystem that they invade. This in turn allows their
populations to grow seemingly uncontrolled and to displace other indigenous
populations. Examples of such an invasive species into North America are
dreissenid mussels, commonly known as zebra and quagga mussels. Their
introduction into the Great Lakes has caused economic hardship and a
reorganization of the ecosystem. This has led, in part, to pollution-causing
effects that can be linked to an alga known as Cladophora.
Ecosystems are webs of intricately balanced interactions, what
happens when a new species is introduced that uses a disproportionate share of
the ecosystem’s resources?
Using the M.U.S.E. link, review the background information and
animation to complete your report.
Use the Lab 5 worksheet for assignment instructions and data
collection.
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