Worked Example

90

We can see the inferred relationship between the species and the different

environmental variables far more clearly using the Rank Plot tab as shown for

moisture below.

The position of the species Potpal, Elepal and Ranfla at the extreme high moisture

content end of the distribution is now quite clear.

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13.3.1 Problems with Species Environment Correlation

The following words of caution are from

Influence of noisy environmental data on canonical correspondence analysis

by Bruce McCune

Ecology, Dec 1997.

As the number of variables in the second matrix increases to near the maximum

possible (one less than the number of sample units), the species environment

correlation always converges on 1.0. At that point, the LC scores (sites scores

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