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12 Cards in this Set

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1. Ecosystems are influenced by a combination of what two factors? Distinguish btw the two factors.
By a combination of biological and physical factors. Biological influences on organisms w/in an ecosystem called biotic factors. include entire living cast of characters w/ which an organism might interact. Physical, or nonliving factors that shape ecosystems are called abiotic factors.
2. Why did the author use the analogy of a person's address when discussing niche?
if an organism's habitat is its address, its niche is its occupation
3. What is a niche?
the full range of physical & biological conditions in which an organism lives and the way in which the organism uses those conditions.
4. What concept did the example of the warbler and spruce in fig. 4-6 represent?
Each of these warbleer species has a diff. niche in its spruce tree habitat. By feeding in diff. A's of the tree, the birds avoid competing w/ one another for food.
5. What would happen if the two of the warbler species occupied the same niche?
They could compete for food if 2 of the warbler species occupied the same niche.
6. What does the term resource refer to?
any necessity of life, such as water, nutrients, light, food,/space.
7. How can comptetition affect an ecosystem?
community interactions, such as competition, predation, and various forms of symbiosis, can powerfully affect an ecosystem. Direct competition in nature often results in a winner and a loser w losing organism failing to survive.
8. State the competitive exclusion principle?
states that no 2 species can occupy the same niche in the same habitat at the same time.
12. Briefly describe the process of ecological succession.
Ecosystems are constantly changing in response->natural & human disturbances. As an ecosystem changes, older inhabitants gradually dies out and new organisms move in, causing further changes in the community.Ex. clearing a forest
10. List the 3 main classes of symbiosis and describe the relationship of each.
Mutualism-both species benefit from the relationship.
Commensalism-1 member of association benefits and other is neither helped nor harmed.
Parasitism-1 organism lives on /inside another ogramisn and harms it.
11. How does a forestry Technician help to maintain, protect, and develop forests?
By planting trees, fighting insects and diseases that attack trees, controling soil erosion.
9. Give an example of how competition can increase the # of species in a community and an ex. of how it can decrease the #'s.
Competition can increase the # of species in a community because the predators are busy competing in order to eat the others.
Decrease the #'s?