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.
Box plot indicating observed number of A domain OBUs across all locations at a rarefaction depth of 3,487; each point represents the number of A domain OBUs at that location. The number of A domain OBUs that appears in each location ranges from 491 to 1,042.
