Fig. 3.
Mean number of harbors in which each species was found as per type of species (introduced, native, cryptogenic). Bars are standard errors
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.