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Similarity in amphibian species composition amongst the 52 Amazonian drainage sub-basins. A - Clustering based on species similarity amongst sub-basins (Jaccard Index); B - Location of the drainage sub-basins in the Amazon Region. Light grey shades represent sub-basins with similarity less than 40%. Shades of blue, green and red represent similarity greater than 40%. Names of the sub-basins are detailed in Suppl. material 1.
