DATA:      Higler et Repko (1981), ter Braak et Verdonschot (1995)
DIRECTORY: \CANOCO\SAMPLES\UNIMODAL\STREAMS
PROBLEM:   Effect of intensive agricultural land-use on macro-invertebrates 
           in streams
BOOKLET:   pp 156-175
ILLUSTRATION OF:
+ standard CCA with both quantitative and qualitative explanatory variables
+ forward selection in CCA.
_______________________________________________________________________________
FILE TYPE    |  FILE NAME    |         DESCRIPTION
-------------+---------------+-------------------------------------------------
 SPECIES     | species.dta   | 197 macro-invertebrate taxa in 40 samples from 
             |               |  the Leuvenum (L) and Uddel stream (U)
ENVIRONMENT  | environm.dta  | 29 environmental variables from all 40 samples, 
             |               |  among which is the month of sampling
 DERIVED     | forward.txt   | result of the project forward.con, as produced 
             |               | with Canoco for Windows (via the clipboard copy)
 PROJECTS    | p_cca.con     | partial CCA of taxa on Source Distance, EC, 
             |               | Discharge and the factor indicating Shrubs along 
             |               | the stream, adjusted for sampling month, 
             |               | yielding Fig. 3 of the paper 
             |               | (p. 165 in Unimodal Models)
             | forward.con   | automatic forward selection yielding Table 3 
             |               |  (except all "-" entries)
             |               |  (p. 174 in Unimodal Models)
-------------+---------------+-------------------------------------------------

Higler, L.W.G. & Repko, F.(1981): The effects of pollution in the drainage
area of a Dutch lowland stream on fish and macro-invertebrates. 
Verh. Int. Verein. Limnol., 21: 1077-1082.

Ter Braak, C.J.F. & Verdonschot, P.F.M.(1995): Canonical correspondence 
analysis and related multivariate methods in aquatic ecology. 
Aquatic Sciences, 57: 255-289.