RESULTS
The richness and beta diversity of ichthyofauna had a significant spatial structure with values of Moran’s I higher than 0.1 (Table 2). Richness of omnivores showed the greatest degree of spatial structure (Moran’s I=0.316, p<0.001), and the richness of detritivores the lowest (Moran’s I=0.120, p=0.010). The beta diversity of the detritivores, insectivores and omnivores presented non-significant effects of spatial autocorrelation.
Table 2. Autocorrelation index of Moran (Moran’s I) performed by richness and beta diversity for all community and trophic guild. Moran’s I - Autocorrelation index of Moran; p - Type one error probability; I (max) - The highest value of Moran’s I to the variable; I/I(max) - The Moran’s I corrected by maximum value.