Showing papers by "Luis Mauricio Bini published in 2000"
TL;DR: In this article, the authors determined the minimum distance between localities that ensures stochastic independence of diversity estimates across space, using geostatistical analyses and analyzed the relationship between local and regional diversity at three different spatial scales, by increasing region size.
Abstract: The relationship between local and regional diversity in viperid snake assemblages from South America was estimated. However, viperid species richness was spatially patterned across the continent, and this result can bias significance levels of regression analyses. To overcome this problem, we determined the minimum distance between localities that ensures stochastic independence of diversity estimates across space, using geostatistical analyses. We analyzed the relationship between local and regional diversity at three different spatial scales, by increasing region size. For the three scales, there was a significant linear relationship between local and regional diversity, indicating that local viperid assemblages are unsaturated and that their local diversity is constrained by species richness of the regional pool. Overall, this result indicates the importance of regional and historical processes on the determination of viperid species richness at local scales. Neste trabalho, a relacao entre d...
15 citations
01 Jan 2000
TL;DR: In this article, the minimum distance between localities that ensures stochastic independence of diversity estimates across space, using geostatistical analyses, was determined, based on the range obtained by a variogram.
Abstract: *Author for correspondence. ABSTRACT. The relationship between local and regional diversity in Falconiformes assemblages from South America was estimated. However, species richness was spatially patterned across the continent and this result can bias significance levels of regression analyses. To overcome this problem, we determined the minimum distance between localities that ensures stochastic independence of diversity estimates across space, using geostatistical analyses. Based on the range obtained b y a variogram, we analyzed the relationship between local and regional diversity using three regions separated by more than 4800 km. To increase robustness of results, we used 30 different combinations of three regions. Most linear regression slopes between local and regional diversity are significant, but none of the quadratic terms added to test local saturation was significant. This indicates that local assemblages of Falconiformes are unsaturated. Overall, this result indicates the importance of regional and historical processes in the determination of species richness at local scales.