env.part: Partitions environmental gradient for analysis

Description Usage Arguments Value Author(s) References

Description

This function compares the number of records in the environmental vector and the umber of rows in the taxa matrix to ensure they are compatible. It then uses the rank order of environmental values at each sampling location to determine group membership of all sampling sites at each level of partitioning.

Usage

1
env.part(env, taxa, minSplt = minSplt)

Arguments

env

A vector of values for each sampling location along the environmental gradient.

taxa

A site by taxon matrix containing observed counts at each sampling location.

minSplt

The minimum split size used in binary partitioning. The default is to use the argument from the original TITAN function call.

Value

A list of seven objects:

  • envan environmental vector

  • numUnitthe number of sample units in env

  • numTxathe number of distinct taxonomic units in taxa

  • numClassthe number of candidate partitions (numUnit-2*minSplt)

  • srtEnva sorted version of the environmental vector

  • envclsa vector of environmental values used to distinguish partitions

  • eclassa matrix of group membership relative to each partition in envcls

Author(s)

M. Baker and R. King

References

Baker, ME and RS King. 2010. A new method for detecting and interpreting biodiversity and ecological community thresholds. Methods in Ecology and Evolution 1(1): 25:37.



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