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.
Estimated fraction of water column cleared (FC) by Dreissena filtration in different depth zones of Lake Michigan and Lake Huron. Bars represent FC calculated from GLNPO data; lines represent FC estimated from more extensive NOAA/CSMI surveys. Dotted line corresponds to nominal average growth phytoplankton rate of 0.06 day−1 (Fahnenstiel et al., 2000). See text for details of calculations.
