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• W2056485630 abstract "Abstract: The Mexican Spotted Owl (Strix occidentalis lucida) is a threatened subspecies of the southwestern United States and northern Mexico. Although threatened, little is known about its population status. We studied the demography of the Mexican Spotted Owl in one study area in Arizona and one in New Mexico from 1991 to 1997. We estimated annual survival rates (φ), fecundity rates ( b), and abundance ( N) to test the hypothesis that population trends were stationary. Although annual fecundity rates ( for Arizona and 0.380 for New Mexico) and annual juvenile survival rates ( for Arizona and 0.109 for New Mexico) differed in magnitude between the study areas, they exhibited similar temporal patterns. Annual survival for territorial owls varied randomly in Arizona but declined linearly in New Mexico. Mean annual survival for territorial owls was 0.814 in Arizona and 0.832 for owls ≥3 years old and 0.644 for owls 1–2 years old in New Mexico. Based on survival and fecundity estimates, the annual rates of change (λ^) indicated that both populations were declining at ≥10% a year. These estimates were corroborated by observed declines in abundance. Some regional factor may have been affecting fecundity, whereas a combination of factors may have been affecting survival. Two possible reasons for the population declines are declines in habitat quality and regional trends in climate. Resumen: La lechuza moteada mexicana (Strix occidentalis lucida) es una subespecie amenazada del suroeste de los Estados Unidos y norte de México. A pesar de estar amenazada, poco se conoce de la situación de sus poblaciones. Estudiamos la demografía de la lechuza moteada mexicana de 1991 a 1997 en un área de estudio en Arizona y una en Nuevo México. Estimamos las tasas de supervivencia anual (φ), las tasas de fecundidad ( b) y la abundancia ( N) para probar la hipótesis de que las tendencias poblacionales son estacionarias. Aunque las tasas de fecundidad anual ( para Arizona y 0.380 para Nuevo México) y las tasas de supervivencia de juveniles ( para Arizona y 0.109 para Nuevo México) difieren en magnitud entre las áreas de estudio, estas exhibieron patrones temporales similares. La supervivencia anual para lechuzas territoriales varia de manera aleatoria en Arizona, pero declinó linealmente en Nuevo México. La media anual de supervivencia para lechuzas territoriales en Nuevo México fue de 0.832 para lechuzas ≥3 años de edad y 0.644 para lechuzas 1–2 años de edad. En base a las estimaciones de supervivencia y fecundidad, las tasas anuales de cambio ( λ^) indicaron que ambas poblaciones estan declinando un 10% al año. Estas estimaciones fueron corroboradas por disminuciones observadas en abundancia. Algunos factores regionales pueden haber afectado la fecundidad, mientras que la combinación de factores pudo haber afectado la supervivencia. Dos posibles razones que podrían explicar estas disminuciones son la disminución en calidad de hábitat y las tendencias regionales del clima." @default.
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• W2056485630 date "1999-08-01" @default.
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• W2056485630 title "Demography of Two Mexican Spotted Owl Populations" @default.
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• W2056485630 doi "https://doi.org/10.1046/j.1523-1739.1999.98302.x" @default.
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