Plots each species in a data frame against an environmental gradient using trellis graphics.
Data frame with species data.
Lowest frequency for species selected for plotting
Other parameters to
plotGrad is intended for preliminary inspection of
the data. It plots each species in a data frame against an
environmental gradient using
grad is numeric, it uses scatter plots
xyplot) and if
grad is a factor, it
uses boxplots (
All species are plotted with equal vertical scale, making scarce
species very flat. Users can change this behaviour by transforming or
standardizing species data before analysis (for instance,
decostand) has options
"max" for making all
species to equal scale).
The function uses trellis graphics in package
transfers all parameters to underlying functions
bwplot. Moreover, many graphical parameters can
be changed after producing the graph (see
Function returns a
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