Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

    We have a manual that explains all the features 

Record number 321002
Title Scale dependency and fractal dimension of rarity
Author(s) Witte, J.P.M.; Torfs, P.J.J.F.
Source Ecography 26 (2003). - ISSN 0906-7590 - p. 60 - 68.
Department(s) Soil Physics, Ecohydrology and Groundwater Management
Hydrology and Quantitative Water Management
Publication type Refereed Article in a scientific journal
Publication year 2003
Keyword(s) species abundance - vegetation
Abstract The rarity of species in a country is usually determined by counting the number of grid cells occupied by those species on a geographical observation grid. In this paper, we present a measure of rarity that is less sensitive to the shape and size of a country. We demonstrate that the distribution of species on a national grid is not monofractal. Consequently, rarity figures cannot be scaled down to a finer grid merely using scale-area plots. We propose a downscaling method that takes into account the non-monofractal distribution of species. Rarity figures have often been published on a scale comprising a limited number of rarity classes. This article finally provides an insight into the degree of accuracy of such classes.
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