Distribution and habitat of flammulated owls (Otus flammeolus) in west-central Idaho

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We conducted 40 flammulated owl (Otus flammeolus) surveys in Hells Canyon National Recreation Area and Payette National Forest lands from 22 May to 11 July, 1991. Sixty singing male flammulated owls were heard throughout the survey area (18 in Hells Canyon National Recreation Area and 42 in Payette National Forest). Crude density estimates ranged from O to 0.84 singing males per 40 ha (x = 0.17, SD = 0.23). Highest survey route densities were at Boulder Creek in the West Mountains, Dukes Creek in the Cuddy Mountains, and Lightning Ridge in the wilderness portion of Hells Canyon National Recreation Area. Regional densities were highest in the wilderness portion of Hells Canyon National Recreation Area and in the West Mountains. Habitat characteristics at 12 owl locations were consistent with previous studies. Flammulated owls were found in areas with mature Ponderosa pine and Douglas—fir, low tree density, moderate canopy closure, and on upper slopes or ridgelines. Old and mature forests dominated 50. 3--ha macrohabitat analysis areas. Natural openings were also found consistently, but in smaller quantities. Clear cuts, partial cuts with less than 50% canopy closure, and immature forests were only minor components. Studies of flammulated owl habitat use and nesting success in relationship to forest fragmentation are needed to assess potential threats to populations. studies of owl dispersion patterns are also needed. Managers need to map potential flammulated owl habitat, monitor flammulated owl populations, and develop plans to retain suitable flammulated owl habitat to maintain viable populations .

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Shelf Note: Electronic Files - Zoology: BIRDS