Fig 2. Temporal patterns of willow ptarmigan population density indices (number of birds observed per km ± 2SE error bars) obtained from 48 survey areas in Hedmark county, SE Norway.
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.