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.
Swim endurance (U crit) differences between all four guppy populations (ancestral high‐predation GH, natural low‐predation GL, and introduced low‐predation LOL and UPL) showing separate pregnancy stages: nonpregnant fish (AP), mid‐pregnancy (MP), and latter‐stage pregnant fish (VP). Bars indicate standard errors.
