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.
Box plots of length (mm) at lake-ages 1–3. The corresponding linear rates of phenotypic change (darwin and haldane) are given for each trait (all P < 0.0001). The boxes cover 50% of the observations, the whiskers 90% of the observations and the large black dot symbol mark the median.
