Presence/absence data of 47 South African species of weevils over a squared
grid of 2 x 2 degrees.
Usage
data(sciobius2x2)
Format
A data frame with 49 observations on 25 columns. Columns are the grid cells in the
study area (South Africa). The first pair of rows correspond to the coordinates of cells
in the grid system (i.e. numeric indices of the cells in the rectangular layout of the grid).
The rest of rows are the species. Presence is indicated with 1 and absence with 0.
Details
Morrone (1994) provides the original matrix for this classical example, but ulterior
corrections are introduced by Mast and Nyffeler (2003). The corrected version of
the data are here represented. Species names are coded through two letters following the
nomclature of Mast and Nyffeler (2003).
Source
Schoeman, A. S. 1983. Revision of the Genus Sciobius Schonherr (Coleoptera: Curculionidae).
Entomol. Mem. Dep. Agric. Repub. S. Afr. 59:1-50.
References
Morrone, J. J. 1994. On the Identification of Areas of Endemism. Syst. Biol. 43:438-441.
Mast, A. R., and R. Nyffeler. 2003. Using a Null Model to Recognize Significant Co-
occurrence Prior to Identifying Candidate Areas of Endemism. Syst. Biol. 52:271-280.