DATA:      Batterink & Wijffels (1983)
DIRECTORY: \CANOCO\SAMPLES\UNIMODAL\DUNEBOOK
PROBLEM:   Explore the relation between vegetation and the environmental 
           conditions and management of dune meadows
BOOKLET:   pp 78-79 (CCA), pp 120 and pp 145-148 (RDA) and text book: 
            Jongman et al (1995)
ILLUSTRATION OF:
+ how to display species as points in an RDA in CanoDraw 3.1
+ how to display environmental variables by centroids in CanoDraw 3.1
+ how to change the scale of the sample scores in CanoDraw 3.1
+ how to interpret the numbers in the file SPEC_ENV.TAB after an RDA
+ how to obtain correlation coefficients between each species and each 
  environmental variable
+ the effect of the scaling options of linear methods on the ordination 
  diagram
_______________________________________________________________________________
FILE TYPE    |  FILE NAME    |         DESCRIPTION
-------------+---------------+-------------------------------------------------
 SPECIES     | table01.dta   | 30 plant species in 20 dune meadows (Table 0.1 
             |               |  in Jongman et al, 1995)
ENVIRONMENT  | table02.dta   | 8 environmental variables (of which four define 
             |               |  the nominal variable management type) in 20 
             |               |  dune meadows (Table 0.2 in Jongman et al, 1995)
 DERIVED     | cov_S_E.dta   | covariances between species and 3 environmental                     |               |  variables (file spec_env.tab after running
             |               |  rda_spe.con)
             | cor_S_E.dta   | correlations between species and 3 environmental
             |               |  variables (file spec_env.tab after running
             |               |  rda-cor.con)
 PROJECTS    | cca_hill.con  | CCA of plant species to 8 environmental 
             |               |  variables (Hillís scaling with focus on 
             |               |  inter-sample distances) (pp 78-79, p 164)
             | cca_bipl.con  | CCA of plant species to 8 environmental 
             |               |  variables (biplot scaling with focus on
             |               |  inter-species distances) (p 164)
             | rda_sam.con   | RDA of plant species to 3 quantitative 
             |               |  variables, focus on inter-sample distances 
             |               |  (pp 120)
             | rda_spe.con   | RDA of plant species to 3 quantitative 
             |               | variables, focus on inter-species correlations
             | rda_cor.con   | RDA of plant species to 3 quantitative 
             |               |  variables, focus on inter-species correlations, 
             |               |  with species centered and standardized
             | rda_eco.con   | RDA of plant species to 8 environmental 
             |               |  variables, with focus on inter-species 
             |               |  correlations, from the Ecoscience paper 
             |               |  (pp 145-148)
-------------+---------------+-------------------------------------------------

Batterink, M. & Wijffels, G.(1983): Een vergelijkend vegetatiekundig
onderzoek naar de typologie en invloeden van het beheer van 1973 tot 1982
in de Duinweilanden op Terschelling. Report Agricultural University, 
Department of Vegetation Science, Plant Ecology and Weed Science. 
Wageningen. 101 pp.