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.
Statistical power to detect 1–10% annual declines in the resident central California marbled murrelet (B. marmoratus) population, with and without a 1.4% annual increase in the proportion of migrants in the population, using estimates of abundance from at-sea surveys collected from 1999 to 2003 (filled black circle, 1.4% annual increase in migration; open circle, no migration).
