Don´t know how to solve the problem with the default plots... but you 
may want to consider plotting arrows manually using either arrows() in 
package graphics or Arrows() in package shape. The latter one has a 
couple of aestethically appealing options :-)

cheers, gabriel


On 07/05/2010 00:09, Devoto Mariano wrote:
> Dear all,
> can enyone please tell me how to change the colour of the arrows of the
> environmental variables when plotting a contrained ordination done in rda?
> They are in blue, but i want black.
> I've tried any possible combination I can think of in plot(), arrows(),
> ordiplot() and plot.cca() and none of them would work.
> Thanks in advance for your reply,
> M.
>
>    
>
>
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