Fig. 6

Source tracking with ocean samples. Distance decay in the contribution of a “source” ocean to a “sink” ocean when using A species-FEAST and B SNV-FEAST. In each experiment, only stations from one ocean were considered sources for a given sink station. For example, when performing source tracking between the Mediterranean and North Atlantic, for each Mediterranean station, the 10 available North Atlantic stations were considered potential sources. Thus, plotted are 10 points for a given Mediterranean sink, where each point represents the contribution of a source station from the North Atlantic to the Mediterranean sink station in question. Shown in the inset text are the slope and t-test p-value for the slope. C and D are flipped source tracking analysis with the Red Sea and Mediterranean, as well as the South Pacific Ocean and North Atlantic Ocean using species-FEAST and SNV-FEAST, respectively