Intepreting a plot from a "constrained" NMDS

Well, I guess you can have a look at

Data Analysis in Community and Landscape Ecology. Edited by R.H.G. 
Jongman, C.J.F. ter Braak, and O.F.R. van Tongeren, 1995, Cambridge 
University Press, 299 pages.

I sure hope it helps.

Un abrazo,

Salvador

Salvador S?nchez-Col?n,
Consultor?a Ambiental y Estad?stica,
Cerrada de Cort?s 43,
Colonia Campestre Tlacopac,
San ?ngel,
01049 M?xico, DF
tel: (+52-55)5662-4644
mobile: (+52-1-55)3200-8559
e-mail: salvadorsanchezcolon at prodigy.net.mx

Manuel Sp?nola escribi?:

Dear list members,

Is there any reference or document on how to interpret a "constrained" 
non-metrical multidimensional scaling using ecological data?  By 
"constrained" I mean after fitting environmental covariables, using, for 
example, the "envfit" function in the vegan package.  Is it possible to 
interpret the resulting plot in the same way that a constrained 
ordination, for example CCA?
Thank you very much in advance.
Best,

Manuel