Table of Contents
ISRN Ecology
Volume 2014, Article ID 198707, 9 pages
Research Article

IBP′: A New Index to Estimate Biogeographical Peculiarity

Università della Calabria, Dipartimento Ecologia, 87036 Rende, Italy

Received 2 October 2013; Accepted 27 October 2013; Published 8 January 2014

Academic Editors: R. Dodd and D. Sánchez-Fernández

Copyright © 2014 Roberto Pizzolotto and Pietro Brandmayr. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The biogeographical peculiarity of a given geographical area is directly linked to the number of its endemic species. This paper aims to formulate an index directly linked to the biogeographical peculiarity of an area. A graphical model and an index of the biogeographical peculiarity are proposed, based on a cumulative sum (i.e., including all the amounts that were added previously). An example of the computations is proposed, based on the number of different types of geographical ranges (i.e., chorotypes) characterizing two different ecosystems; their biogeographical peculiarity of was evaluated on the basis of presence versus absence of carabid species. Both the graphical model and the index mirrored the different faunistic compositions of the ecosystems, because the index reached a higher value where more endemic species have been found. Our investigation has found a new method for evaluating the biogeographical peculiarity of a given area or biota in a simple way. The index could be used for either conservation biogeography (e.g., monitoring of biotic homogenization) or for theoretical studies integrating ecology and biogeography.