FIGURE 3.

Partitioning of the variation in occupancy of stream fish assemblages in Curuá-Una, Capim and Gurupi River Basins (species abundance), and all river basins together (functional guilds abundance) showing the variance explained by each group of predictor variables (dark grey) when partitioning out the effects of the other groups through redundancy analysis (partitions [a], [b], [c] and [d] according to variance partition analysis) and the fractions shared between the groups (light grey). Unexplained variance is represented in white. Negative values of indicate that the predictor variables explain less variation than random normal variables, and should be interpreted as zeros (Legendre, 2008)