# BIOL 215 Lecture Notes - Lecture 16: Intraspecific Competition, Interspecific Competition, Logistic Function

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**preview**shows page 1. to view the full**4 pages of the document.**BIOL215 Lecture 16 Notes

In general, Lotka and Volerra predicts coexistence of two species when, for both species, interspecific

competition is weaker than intraspecific competition

Lotka-Voltera provided a mathematical model based on the logistic equation:

Logistic equations for species 1 and 2:

Intraspecific (within species) competition is represented by K-N/K

The assumption is that resources diminish as N increases because of intraspecific competition

Obviously resources will also decrease with interspecific (between species) competition. Lotka-Voltera

proposed:

Where a (alpha) and b (beta) are competition coefficients

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