[R] discerning species by color in cca biplot

[Gavin Simpson]

If you only have seven species, why not draw the label for the species
(the names() component of your data) at the species score, rather than a
colour?

plot(OBJ, display = c("sites","species"), scaling = 3, type = "n")
points(OBJ, display = "sites", scaling = 3, type = "p")
points(OBJ, display = "species", scaling = 3, type = "t")

Not tested, am away at the moment but heading home. If you are still
having trouble (and I see now why you wanted matplot) then email back and
I'll given a longer example illustrating who to build up plots by hand.

Gavin

> Dear List,
>
> I am running constrained correspondence analysis for abundance data of 7
> birds.
>
> However, I would like to check which bird prefers which environment
> gradient
> by showing the species with different colors of the dots in cca plot
> (package vegan).
>
> Please kindly help and thank you
>
> Elaine
>
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>
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