Isotopic and geologic makeup of major watersheds of the Amazon River basin.

* Outlier dropped from regression analysis
° Values are prediction intervals of the regression from Eq 1.
Strontium ratios were taken from water samples reported in the literature for locations throughout the Amazon Basin and used as baselines to determine the likely location of fish movement. These samples were classified to three statistically distinguishable river group classifications using quadratic discriminant function analysis. Unsampled locations were predicted using geologic regression (Eq 1).
Isotopic and geologic makeup of major watersheds of the Amazon River basin.