Revista chilena de historia natural
versión impresa ISSN 0716-078X
CASAGRANDA M , DOLORES; ROIG-JUNENT, SERGIO y SZUMIK, CLAUDIA . Endemism at different spatial scales: an example with Carabidae (Coleóptera: Insecta) of austral South America. Rev. chil. hist. nat. [online]. 2009, vol.82, n.1, pp. 17-42. ISSN 0716-078X. http://dx.doi.org/10.4067/S0716-078X2009000100002.
In this paper we perform an endemicity analysis using ca 4,000 distributional records from 426 carabid species/subspecies distributed along austral South America. We used the program NDM/VNDM which implements a fill function (R. fill) to heuristically assign species' potential occurrence from observed presences. In the present analysis we use different grid sizes, and also we explore different values for the fill function (R. fill). The areas of endemism identified by NDM/VNDM were compared with previous biogeographical hypotheses. Some resulting areas of endemism were recognized through the whole range of grid sizes, while others could only be identified by using a particular grid size. In general, the use of small cells helped identify disjunct areas of endemism, as well as small ones, whereas big cells were convenient for the identification of broad areas that appeared as fragmented if smaller cells were used. In general, as R.fill function increased, the number of recognized areas of endemism and endemic species also increased. Our results show that areas of endemism with diverse traits can be derived from a singular combination of R. fill and grid size, emphasizing the importance of exploring different analytical options during the identification of distributional patterns.
Palabras clave : endemicity analysis; spatial scale; Carabidae; austral South America.