#' @section Null models:
#' \itemize{
#' \item 0 - Phylogeny shuffle: This null model shuffles species labels across
#' the entire phylogeny. This randomizes phylogenetic relationships among
#' species.
#' \item 1 - Species in each sample become random draws from sample pool:
#' This null model maintains the species richness of each sample, but the
#' identities of the species occurring in each sample are randomized. For
#' each sample, species are drawn without replacement from the list of all
#' species actually occurring in at least one sample. Thus, species in the
#' phylogeny that are not actually observed to occur in a sample will not
#' be included in the null communities
#' \item 2 - Species in each sample become random draws from phylogeny pool:
#' This null model maintains the species richness of each sample, but the
#' identities of the species occurring in each sample are randomized. For
#' each sample, species are drawn without replacement from the list of all
#' species in the phylogeny pool. All species in the phylogeny will have
#' equal probability of being included in the null communities. By changing
#' the phylogeny, different species pools can be simulated. For example, the
#' phylogeny could include the species present in some larger region.
#' \item 3 - Independent swap: The independent swap algorithm (Gotelli and
#' Entsminger, 2003); also known as ‘SIM9’ (Gotelli, 2000) creates swapped
#' versions of the sample/species matrix.
#' }
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