Number of spotted owls detected, number of territories surveyed, and new territories added by year, Cle Elum Study Area, Wenatchee National Forest, Washington, 1989-2008

Notes:

Empirical estimates (not corrected for recapture probability).

Note that the number of territories monitored peaked about 1992 and has remained relatively consistent since.

Note the number of new territories added per year peaked about 1992, though we have added a few territories to the sample, e.g. 2003.