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.
The shaded area represents the standard error of the rarefaction calculated after [102]. The horizontal scale is reduced to 3000 for greater detail.
