Julie L. Yee Michael R. Miller Dennis L. Orthmeyer Daniel R. Yparraguirre Robert L. Jarvis Cory T. Overton Michael L. Casazza 2005 <p><span>There is no formal population survey specifically designed to index population abundance of band-tailed pigeons (</span><i>Patagioenas fasciata</i><span>) throughout their range. Data from the Breeding Bird Survey (BBS), Washington and Oregon Mineral-Site (WAORMS) surveys, and Washington Call Count (WACC) survey offer evidence of long-term population decline. We investigated the potential to augment BBS, WACC, and WAORMS surveys to provide more precise population indices for the Pacific Coast band-tailed pigeon (</span><i>P. f. monilis</i><span>) and augment the BBS to index the Interior or “Four Corners” population (</span><i>P. f. fasciata</i><span>). We calculated statistical power, the probability of detecting population change given that a change exists, and analyzed survey data to investigate the effect of route length, survey repetition, and sample size. Sample sizes of 50 sites or routes yielded corresponding powers of 99% for WAORMS, 54% for WACC, and 30% for Pacific BBS, to detect a 10% annual change over a 5-year period (a = 0.10). Route length and repetition of surveys had little impact on power. Mineral-site surveys provide the greatest potential to monitor breeding populations and detect short-term trends in the Pacific Coast population. New survey techniques are needed for the Interior band-tailed pigeon.</span></p> application/pdf 10.2193/0091-7648(2005)33[606:EOCPIF]2.0.CO;2 en The Wildlife Society Evaluation of current population indices for band-tailed pigeons article