Figure 1.
Map of sampling locations. Four basins were sampled. Sampling stations are shown as white circles in the zoomed-in regions. Scale bars in the zoomed-in basin maps correspond to 100 km.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.