Biology Chapter 53 Objectives

Biology Chapter 53 Objectives - Chapter 53 Objectives 2....

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Chapter 53 Objectives 2. The competitive exclusion principle states that two species competing for the same limiting resources cannot coexist in the same place. One species will use the resources more efficiently and thus reproduce more rapidly than the other. Even a slight reproductive advantage will eventually lead to local elimination of the inferior competitor. 3. A niche is the sum total of a species' use of the biotic and abiotic resources in its environment. In relation to the competitive exclusion principle, two species cannot coexist in a community if their niches are identical. However, ecologically similar species can coexist in a community if there are one or more significant differences in their niches. 4. A species' fundamental niche, the niche potentially occupied by that species may be different from its realized niche, the niche it actually occupies in a particular environment. 5. Evolution by natural selection can result in a change of one of two identical niches, then allowing its respective species to survive by using a different set of resources. The differentiation of niches that enables similar species to coexist in a community is called resource partitioning. 6. Predation refers to a +/- interaction between species in which one species, the predator, kills and eats the other, the prey (i.e. the lion and the gazelle). Herbivory is another +/- interaction in which an herbivore eats parts of a plant or alga (i.e. cattle, grasshoppers,
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This note was uploaded on 08/29/2009 for the course BIOL 101 taught by Professor Sakji during the Fall '08 term at Linn Tech.

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Biology Chapter 53 Objectives - Chapter 53 Objectives 2....

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