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.
Observed gizzard masses (mean±s.e.) for each subspecies at its wintering site (closed symbol) and stopover site (open symbol, where data are available). Boxes in the background give range in expected gizzard mass (± s.e.), where each box spans the expected gizzard mass of satisficing (bottom) and net rate-maximizing birds (top).
