A list with a component for every region. The components are vectors of integers indicating neighboring regions. A region without neighbors (e.g., an island) should be assigned a list numeric(0).

numerical between 0 and 1. The probability that a new region is drawn from the non-neighborhood of the previous regions belonging to a species under generation. Note that for a given presence-absence matrix, this parameter can be estimated by autoconst (called pd there).

integer. Number of species.

integer not larger than n.species. Number of species restricted to one of the two groups of regions defined by reg.group (called "clustered species" because this leads to more similar species ranges).

vector of pairwise distinct integers not larger than n. regions. Defines a group of regions to which a part of the clus.specs clustered species is restricted (more or less, see grouppf). The other clustered species are restricted to the complementary regions.

numerical. The probability of the region of a clustered species to belong to the corresponding group of regions is up-weighted by factor grouppf compared to the generation of "non-clustered" species.

integer. Number of regions.

vector of integers. The sizes (i.e., numbers of regions) of the species are generated randomly from the empirical distribution of vector.species.

numerical vector of length n.species. The entries must sum up to 1 and give probabilities for the regions to be drawn during the generation of a species. These probabilities are used conditional on the new region being a neighbor or a non-neighbor of the previous regions of the species, see p.nb, modified by grouppf for the clustered species.

logical. If TRUE, the number of the currently generated species is printed.

logical. If TRUE, the probabilities of the regions are modified according to the number of neighboring regions by dividing them relative to the others by min(1,number of neighbors).