Eliminates species from the community data frame that occur fewer than or equal to a threshold number of occurrences.
dropspc(comm,minocc=0,minabu=0)Produces a new community data frame
a community data frame
the threshold number of occurrences to be dropped
the threshold minimum abundance to be dropped
David W. Roberts droberts@montana.edu
The function is useful for eliminating species (columns) from community data frames which never occur, which often happens if you eliminate plots, and those plots are the only ones that contain that species. In addition, many species are rare in data frames, and some algorithms (especially dissimilarity functions and table sorting routines) benefit from smaller, simpler data frames.
data(bryceveg) # returns a data frame called bryceveg
newveg <- dropspc(bryceveg,5) # deletes species which
# occur 5 or fewer times
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