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.
Shoal density as a function of time in the gravel floor condition (solid lines, n = 14 groups) and the white floor condition (dashed lines, n = 15 groups). The thick black lines denote the fit from the linear mixed-effects models, and the grey lines the fits from models for individual groups.
