Type III/Type IV secretion systems play a major role in transfer of bacterial Nod factor in plant cell. 

TLS Online TPP Program

#Id: 3724

#Unit 10. Ecological Principles

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

TLS Online TPP Program

#Id: 3725

#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

TLS Online TPP Program

#Id: 3726

#Unit 10. Ecological Principles

More diverse communities have a lower value of D BP than less-diverse communities.

TLS Online TPP Program

#Id: 3727

#Unit 10. Ecological Principles

Berger-Parker complement index is that it is very easy to compute. Values of D_BPC vary from 0 to 1.
D_BPC =1 - D_BP

TLS Online TPP Program

#Id: 3728

#Unit 10. Ecological Principles

Simpson’s diversity index

DS and species diversity are negatively related.

TLS Online TPP Program

#Id: 3729

#Unit 10. Ecological Principles

Gini Simpson index of diversity (DGS) = 1 − DS.

DGS and species diversity are positive related