The distribution of species richness can be described at different spatial grain. Here, as an example, the Amazon Basin is divided into 23 major sub-basin units greater than 20 000 km2. At this spatial grain (Level 1), the Negro and Madeira river basins show the highest fish diversity with 1 233 and 1 406 species, respectively.
The map is interactive: click on each sub-basins area to see richness at a finer spatial resolution (Level 2). Click on the dark grey zone to go back to Level 1. Project in progress, given values are temporary.
New website to visualize and download freshwater fish biodiversity data:
Freshwater Fish Distribution & Ecology Website