Fig. 8. Allochthonous versus autochthonous origin of DOC in African lakes depends on type (humic versus nonhumic).

DOC versus Chl-a (A) concentration and versus cyanobacteria abundance (B) in surface waters of several African tropical lakes. Solid line is a fit to the data (table S3). For lakes where multiple measurements were made, the symbol shows the median (n indicates the number of measurements).