Here is your midterm exam. The exam is due in class on Monday. You may use your notes or any other written sources of information. Please do not discuss the exam questions with any classmate or other people (i.e., you can't call Dr. Tilman to ask him about ZNGIs). Good luck.
1. (20 points)
We used Tilman's model to try to understand the conditions under which it is possible for two competing species to coexist. Define- ZNGI, consumption vector, supply vector, and resource supply point and discuss why a knowledge of all 4 of these components is necessary if we are to understand when coexistence is possible.
2. (30 points)
Many plants and animals are involved in mutualistic relationships with microorganisms. Why are mutualisms between animals/plants and microorganisms likely to be more common than mutualisms between two species of animals, two species of plants, or an animal and a plant?
Be sure to think about both the origin and the maintenance of the mutualism in your answer.
3. (30 Points)
Discuss at least two environmental problems that arise as a result of humans altering nutrient cycles.
4. (20 points)
Discuss why niche partitioning might be easier for animals than for plants.
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