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The Future of Energy: Guiding Decisions with Evidence

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Submitted By xray2005
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* In the Lake Michigan food web, is it possible to identify the most important producer? Why or why not?
It is not possible to identify the most important producer. There are multiple consumers which are consumed by several different primary consumers. The image was blurry so it was difficult to determine what everything was in the food web. * What would happen if there was a change in the population size for any one of the producers (either an increase or a decrease)? How could these changes impact other producers and organisms on other trophic levels?
If there were an increase in population in any one of the producers, they would begin to dominate the other producers and therefore would increase the number of consumers which feed on the producer. If there were a decrease in one of the producers then there may be a decrease in consumers that are reliant on the producer for food or the consumer could choose a different producer. If the consumer chose a different producer for food, the result would be a depletion of this producer. It could end up like a snowball effect by one affecting the other. * Provide at least two types of impacts that humans could have on this food web.
Burning of coal can cause air pollution which can cause acid rain and change the ecosystem of the lake. http://www.ucsusa.org/clean_energy/coalvswind/c02b.html
Dumping of toxins into the lake which could disrupt producers and have an effect on producers. * Read the description of the sea lamprey on page 2 of the food web. This species is described as non-native. * Propose a mechanism for how this fish was introduced to Lake Michigan. http://www.miseagrant.umich.edu/downloads/ais/97-500-five-lampreys.pdf * What challenges could occur within a food web when a new predator like this is introduced into an ecosystem?

* What natural population controls are missing for this species within this food web? * Do you think steps should be taken to eradicate this species from the food web? Explain why or why not? If so, what steps can be implemented? http://www.actionbioscience.org/biodiversity/simberloff.html DB Intro Species

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