Term
This is also called scramble or exploitative competition and features organisms that utilize the same resources that are in short supply |
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Definition
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Term
This is also called contest competition and features organisms that seek a resource and, by doing so, harm one another in the process |
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Definition
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Term
What is one critical parameter that determines competition amongst plant species? |
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Definition
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Term
What are the Lotka-Volterra equations bringing into account? |
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Definition
They are accounting for the fact that two given species use the same resource to grow and reproduce |
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Term
(alpha)N2 = the equivalent number of species one individuals which means that alpha is the conversion factor for expressing species two in units of species one. What does this all mean? |
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Definition
Alpha is the effect of species 2 on species 1 |
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Term
What does it mean when the alpha value for competition between two species is higher than 1? |
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Definition
The per capita effect of interspecific competition is more important than the per capita effect of intraspecific competition |
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Term
What are the three potential outcomes in the case of competition? |
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Definition
1: Both species coexist 2: Species 1 becomes extinct 3: Species 2 becomes extinct |
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Term
What were the two key conclusions drawn from Tilman's model? |
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Definition
1: You can predict the outcome of competition if you know the limiting nutrient concentration for each species and 2: superior competitors consume limiting resources to low levels, thereby eliminating competitors |
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Term
What was actually found to be the limiting factor in yeast growth between two species from Gause's (1932) experiments? |
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Definition
Ethyl alcohol was preventing new yeast buds from growing |
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Term
What did Hutchinson (1958) define the fundamental niche of a species as? |
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Definition
It is the set of resources of a species that can be utilized in the absence of competition and other biotic factors |
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Term
What two key problems has the fundamental niche idea run into? |
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Definition
1: Given the potentially infinite number of dimensions, we will have trouble defining or measuring the niche of any organism and 2: this model refers to a singular point in time whereas competition is a dynamic process |
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Term
What is a realized niche? |
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Definition
It is the observed resource use of a species in the presence of competition |
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