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1 June 2014 Factors Associated with Flammulated Owl and Northern Saw-Whet Owl Occupancy in Southern Idaho
Micah N. Scholer
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Abstract

Spatially explicit models depicting species occupancy offer a useful conservation tool for land managers. Using occurrence data collected in 2009 and 2010 from the Boise National Forest, Idaho, we developed distribution models for Flammulated Owls (Psiloscops flammeolus) and Northern Saw-whet Owls (Aegolius acadicus) to explore associations between habitat factors and owl occupancy. We then spatially applied these models in a Geographic Information System. We considered land cover and topographic variables at three spatial scales: 0.4-km, 1-km, or 3-km-radius plots centered on point-count locations (n  =  150) with resolution of land covers at 30 m. Flammulated Owls occupied 27 (18%) point-count locations and occurred in areas with a higher proportion of Douglas-fir (Pseudotsuga menziesii) at the 0.4-km scale, less diverse land cover composition at the 1-km scale, and in south-facing aspects at the 3-km scale. Northern Saw-whet Owls occupied 45 (30%) point-count locations and were associated with relatively flat terrain at the 0.4-km scale that had larger proportions of non-forest land cover. At the 1-km and 3-km scales, Northern Saw-whet Owls occurred in areas with south-facing aspects having a higher proportion of ponderosa pine (Pinus ponderosa), respectively. Biologists and land managers interested in the conservation of Flammulated Owls and Northern Saw-whet Owls can use our approach to delineate habitats important for these owls or to help identify locations suitable for restoration.

Los modelos espacialmente explícitos utilizados para describir la ocupación representan una herramienta útil de conservación para los encargados del manejo territorial. Desarrollamos modelos de distribución para Psiloscops flammeolus y Aegolius acadicus utilizando datos de ocurrencia registrados en 2009 y 2010 en el Parque Nacional Boise, Idaho, para explorar asociaciones entre las características del hábitat y la ocupación de las lechuzas. Luego aplicamos espacialmente estos modelos en un Sistema de Información Geográfica. Consideramos la cobertura del suelo y las variables topográficas a tres escalas espaciales: parcelas de radio de 0.4 km, 1 km o 3 km centradas en sitios de puntos de conteo (n  =  150) con resolución de cobertura del suelo de 30 m. P. flammeolus ocupó 27 (18%) puntos de conteo y estuvo presente en áreas con una mayor proporción de Pseudotsuga menziesii a la escala de 0.4 km. A. acadicus ocupó 45 (30%) puntos de conteo y estuvo asociada a un terreno relativamente plano a la escala de 0.4 km con una mayor proporción de cobertura del suelo no boscosa. A las escalas de 1 y 3 km, A. acadicus estuvo presente en áreas con laderas de exposición sur con una mayor proporción de Pinus ponderosa. Los biólogos y encargados del manejo territorial interesados en la conservación de P. flammeolus y A. acadicus pueden utilizar nuestro enfoque para determinar hábitats importantes para estas lechuzas o para ayudar a identificar áreas apropiadas para ser restauradas.

The Raptor Research Foundation, Inc.
Micah N. Scholer "Factors Associated with Flammulated Owl and Northern Saw-Whet Owl Occupancy in Southern Idaho," Journal of Raptor Research 48(2), 128-141, (1 June 2014). https://doi.org/10.3356/JRR-13-00049.1
Received: 17 July 2013; Accepted: 1 January 2014; Published: 1 June 2014
KEYWORDS
Aegolius acadicus
Flammulated Owl
Idaho
Northern Saw-whet Owl
occupancy
Psiloscops flammeolus
spatially explicit model
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