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12 Cards in this Set
- Front
- Back
Modes of Compitition
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1)Interference
2)Intraspecific 3)Interspecific |
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Interference
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Direct aggressive interaction btwn individuals
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Intraspecific
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competition btwn individuals of the same species
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Interspecific
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competition btwn members of different species, reduces fitness of both
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Self-Thinning
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Higher population densities causing mortality among competing plants
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Niche
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summarizes environmental factors that influence growth, survival, and reproduction of a species
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Principle of Competitive Exclusion
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2 species with the same niches cannont coexist indefinitely
-one will ultimately be a better competitor |
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n-dimensional hyper-volume
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-n equates the number of environmental factors important to survival and reproduction of a species
+Fundamental niche- hypervolume +Realized niche- includes interaction that restricts environments where a species can live |
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Lotka Volterra
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Effect of interspecific competition on population growth of each species
-predicts coexistance of 2 species when inter- is less than intraspecific competition |
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Competitions and Niches
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Can restrict species to their realized niches.
-if strong and persuasive enough can cause evolutionary changes. change fundamental niches. |
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Character Displacement
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Interspecific competition has been predicted to lead to directional selectionfor reduced niche overlap
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Character Displacement
(ness criteria) |
-Morph diff btwn sympatric species are greater than allopatric populations
-Diff btwn sympatric and allopatric species have genetic bias -Diff bwtwn both evolved in place, and do not come from diff founder groups already differing in the character -Variation in the character must have a known effect on use of resources -Must be demonstrated competition for the resource and it must be directly correlated with character similarity -Diffs in character cannot be explained by differences in resources available to each of the populations |