Competition

Intra-specific Competition

Inter-specific Competition

Lotka-Volterra

Basic Logistic Model

Extension - to add a second species

Competition Coefficient

Zero-Sum Game

Two Symmetrical Equations

Phase-plane Analysis

Step 1

Step 2

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mechanisms that have been documented in the literature include:

direct competition for a common resource - habitat feature or food

indirect competition - competitive effects resulting from trophic linkages

pre-emptive competition - occupancy of space, based on presence, that excludes another

over growth - simply one species growing over another

allelopathy - biochemical effect of organism A on B

territoriality - when it is between species it is also termed interference competition

strength will influence population growth

intense and unavoidable

Between conspecifics, for niche space

results in natural selection

between species

usually less intense than intra-specific competition

can have dramatic consequences for competing populations, leading to local extinction

also results in natural selection

2) as population size increase, however, the presence of one population (1) begins to interfere with the growth of the other population (2) with 1 using resources required by population 2

1) when population numbers are low, resources are not limiting and both populations experience rapid (exponential) growth