Figure 3.
Temporal variation in DD0 at arrival, and in arrival date. Frequency distribution of DD0Yr for (a) phenological time series or (b) within-species means. (c) Frequency distribution of the mean species-specific MADYr.
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.