Non-Parametric Test Definition, The non-parametric test does not require any population distribution, which is meant by distinct parameters. It is also a kind of hypothesis test, which is not based on the underlying hypothesis.

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#Unit 10. Ecological Principles

Clement’s organismic model- Competition causes sharp boundaries between groups of species; certain species group together.

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#Unit 10. Ecological Principles

Gleason’s individualistic model- Competition does not cause sharp boundaries; different species do not group together due to physical variables.

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#Unit 10. Ecological Principles

Principle of species individuality

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#Unit 10. Ecological Principles

Species richness- which is a count of the number of species.

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#Unit 10. Ecological Principles

One major problem is that this approach does not take species frequency of occurrence or relative abundance into account.

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#Unit 10. Ecological Principles

Berger-Parker index- Dominance indices are weighted toward the abundance of the commonest or dominant species

D_BP= N_max/N