Permutated species accumulation curves (=sample-based rarefaction curve; red line: mean, blue lines: 95% confidence intervalls) of amphibian species richness in a the Krahn-Bassa Proposed Protected Area in eastern Liberia and b the Foya Proposed Protected Area in western Liberia during the March/April 2018 survey. Y-axis: estimated amphibian species richness, x-axis: sample units (each comprising six to 16 man/hour surveys in different localities within the respective areas).