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12 Cards in this Set
- Front
- Back
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1. Ecosystems are influenced by a combination of what two factors? Distinguish btw the two factors.
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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.
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2. Why did the author use the analogy of a person's address when discussing niche?
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if an organism's habitat is its address, its niche is its occupation
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3. What is a niche?
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the full range of physical & biological conditions in which an organism lives and the way in which the organism uses those conditions.
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4. What concept did the example of the warbler and spruce in fig. 4-6 represent?
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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.
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5. What would happen if the two of the warbler species occupied the same niche?
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They could compete for food if 2 of the warbler species occupied the same niche.
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6. What does the term resource refer to?
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any necessity of life, such as water, nutrients, light, food,/space.
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7. How can comptetition affect an ecosystem?
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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.
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8. State the competitive exclusion principle?
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states that no 2 species can occupy the same niche in the same habitat at the same time.
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12. Briefly describe the process of ecological succession.
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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
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10. List the 3 main classes of symbiosis and describe the relationship of each.
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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. |
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11. How does a forestry Technician help to maintain, protect, and develop forests?
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By planting trees, fighting insects and diseases that attack trees, controling soil erosion.
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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.
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Competition can increase the # of species in a community because the predators are busy competing in order to eat the others.
Decrease the #'s? |
