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.
Grazer removal = −G; Grazers present = +G; Procedural control = PC. Values are averages across habitats and regions (n = 40).
