DATA:      Van der Aart & Smeek-Enserink (1975)
DIRECTORY: \CANOCO\SAMPLES\UNIMODAL\SPIDER1
PROBLEM:   Determination of the niches of hunting spiders in a dune area
BOOKLET:   pp 54-55
ILLUSTRATION OF:
+ DCA interpretation.
+ How to plot a species response curve against an ordination axis using 
  CanoDraw
+ How to interpret an indirect gradient analysis with CANOCO if there are many
  samples without environmental data.
+ How CANOCO links samples in different files.
+ How to relate the ordination axes of different analyses.

_______________________________________________________________________________
FILE TYPE    |  FILE NAME    |         DESCRIPTION
-------------+---------------+-------------------------------------------------
 SPECIES     | spide100.dta  | counts of 12 hunting spiders in 100 pitfalls in 
             |               | a dune area
ENVIRONMENT  | soilveg.dta   | data 26 variables on soil and vegetation around 
             |               | 28 of the pitfalls
             | soilvgln.dta  | ln-transformed soil and vegetation variables 
             |               | 28 pitfalls
 DERIVED     | dca100.dta    | sample scores on the DCA axes, derived in 
             |               | project spidedca.con from the spider counts
 PROJECTS    | spid_ca.con   | CA of spider counts (100 active samples)
             | spid_dca.con  | DCA of spider counts (100 active samples)
             | indirect.con  | regression of the first axis of the DCA on the 
             |               | soil and vegetation variables(28 active samples)
             | indiforw.con  | as indirect.con but using forward selection
             | dca28.con     | DCA of spider counts with environment data, 
             |               | yielding a DCA of 28 pitfalls only (28 
             |               | active samples)
             | dca28100.con  | DCA of spider counts with environment data, 
             |               | relating the two DCA analyses for the 28 
             |               | pitfalls
             | spid_cca.con  | CCA of spider counts on 6 soil and vegetation 
             |               | variables (28 active pitfalls)
-------------+---------------+-------------------------------------------------

Van der Aart, P.J.M. & Smeenk-Enserink, N.(1975): Correlations between
distribution of hunting spiders (Lycosidae, Ctenidae) and environmental
characteristics in a dune area. Neth. J. Zool., 25: 1-45.