89
ECOM II
Sample Score and Species Score tabs. Generally you will be far more interested in
the plot of the results which is viewed from the Ordination Plot tab is shown below.
This is a plot of the 1st and 2nd canonical axes, which we have shown above are the
only statistically significant axes. Thus, there is not much point in examining the
other axes.
The lengths and positions of the arrows provide information about the relationship
between the environmental variables and the derived axes. Arrows that are parallel to
an axis (e.g. moisture and axis 1) indicate a correlation, the length of the arrow tells
us about the strength of that correlation. Thus, pasture is related to axis 1 but not as
strongly as moisture. Neither of these is related to axis 2.
The above plot is rather confusing and cluttered because we have plotted the
environmental vectors or centroids, the site (sample) scores and the species
(dependent variable) scores all on the same graph. Further, all the labels have been
included. The 
graph plotting options
 allow many variations to be plotted to make the
output clearer.
The position of the sites indicates their status with respect to the environmental
variables. Thus site 19 has a negative score on axis 2 and axis 2 has a high manure
component. This indicates that we would predict there has been little manuring on
site 19.
In similar fashion the positions of the species indicates their response to particular
environmental variables. For example Potpal, Elepal and Ranfla are associated with
moist sites.
Copyright 2004  PISCES Conservation Ltd





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