Point sampling of fish community
This data set gives informations between a faunistic array, the total number of sampling points made at each sampling occasion and the year of the sampling occasion.
data(ichtyo)
ichtyo is a list of 3 components.
is a faunistic array with 9 columns and 32 rows.
is a vector of the 32 sampling effort.
is a factor where the levels are the 10 years of the sampling occasion.
The value n(i,j) at the ith row and the jth column in tab corresponds
to the number of sampling points of the ith sampling occasion (in eff) that contains the jth species.
Dolédec, S., Chessel, D. and Olivier, J. M. (1995) L'analyse des correspondances décentrée: application aux peuplements ichtyologiques du haut-Rhône. Bulletin Français de la Pêche et de la Pisciculture, 336, 29–40.
data(ichtyo) dudi1 <- dudi.dec(ichtyo$tab, ichtyo$eff, scannf = FALSE) s.class(dudi1$li, ichtyo$dat, wt = ichtyo$eff / sum(ichtyo$eff))
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