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NEU Ecology Fall 2013 Lec set 8
Lec set 8 flashcards
12
Environmental Studies
Undergraduate 2
11/07/2013

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Cards

Term

This is also called scramble or exploitative competition and features organisms that utilize the same resources that are in short supply

Definition

Resource competition

Term

This is also called contest competition and features organisms that seek a resource and, by doing so, harm one another in the process

Definition

Interference competition

Term

What is one critical parameter that determines competition amongst plant species?

Definition

Spacing of individuals

Term

What are the Lotka-Volterra equations bringing into account?

Definition

They are accounting for the fact that two given species use the same resource to grow and reproduce

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?

Definition

Alpha is the effect of species 2 on species 1

Term

What does it mean when the alpha value for competition between two species is higher than 1?

Definition

The per capita effect of interspecific competition is more important than the per capita effect of intraspecific competition

Term

What are the three potential outcomes in the case of competition?

Definition

1: Both species coexist 2: Species 1 becomes extinct 3: Species 2 becomes extinct

Term

What were the two key conclusions drawn from Tilman's model?

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

Term

What was actually found to be the limiting factor in yeast growth between two species from Gause's (1932) experiments?

Definition

Ethyl alcohol was preventing new yeast buds from growing

Term

What did Hutchinson (1958) define the fundamental niche of a species as?

Definition

It is the set of resources of a species that can be utilized in the absence of competition and other biotic factors

Term

What two key problems has the fundamental niche idea run into?

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

Term

What is a realized niche?

Definition

It is the observed resource use of a species in the presence of competition

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