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- W1541143314 abstract "ABSTRACT Greater Roadrunners (Geococcyx californianus) are common, poorly studied birds of arid and semi-arid ecosystems in the southwestern United States. Conservation of this avian predator requires a detailed understanding of their movements and spatial requirements that is currently lacking. From 2006 to 2009, we quantified home-range and core area sizes and overlap, habitat selection, and survival of roadrunners (N= 14 males and 20 females) in north-central Texas using radio-telemetry and fixed kernel estimators. Median home-range and core-area sizes were 90.4 ha and 19.2 ha for males and 80.1 ha and 16.7 ha for females, respectively. The size of home range and core areas did not differ significantly by either sex or season. Our home range estimates were twice as large (x̄= 108.9 ha) as earlier published estimates based on visual observations (x̄= 28–50 ha). Mean percent overlap was 38.4% for home ranges and 13.7% for core areas. Male roadrunners preferred mesquite woodland and mesquite savanna cover types, and avoided the grass-forb cover type. Female roadrunners preferred mesquite savanna and riparian woodland cover types, and avoided grass-forb habitat. Kaplan-Meier annual survival probabilities for females (0.452 ± 0.118[SE]) were twice that estimated for males (0.210 ± 0.108), but this difference was not significant. Mortality rates of male roadrunners were higher than those of females during the spring when males call from elevated perches, court females, and chase competing males. Current land use practices that target woody-shrub removal to enhance livestock forage production could be detrimental to roadrunner populations by reducing availability of mesquite woodland and mesquite savanna habitat required for nesting and roosting and increasing the amount of grass-forb habitat that roadrunners avoid. El Correcaminos Mayor (Geococcyx californianus) es un ave común de ecosistemas áridos y semi-áridos del suroeste de los Estados Unidos, que ha sido poco estudiada. La conservación de un ave depredadora requiere un entendimiento detallado de sus movimientos y requerimientos espaciales, lo que en la actualidad falta. De 2006 al 2009, cuantificamos el ámbito hogareño y el tamaño del área central (corea rea) y solapamiento, selección de hábitat y sobrevivencia de correcaminos (N= 14 machos y 20 hembras) en la parte norte-central de Texas, utilizando radio telemetría y estimados fijos de distribución. La media del ámbito hogareño y del área central, fueron entre 90.4 ha y 19.2 para los machos y 80.1 ha y 16.7 ha para las hembras, respectivamente. El tamaño del ámbito hogareño y del área central no se diferencio significativamente entre sexos o temporadas. Nuestros estimados del ámbito hogareño resultaron ser el doble (108.9 ha) de lo previamente publicado basado en observaciones (28–50 ha). El porcentaje promedio de solapamiento fue de 38.4% para ámbitos hogareños y de 13.7% para áreas centrales. Los correcaminos machos prefirieron matorrales de mezquita y sabanas de mezquita y evitaron las áreas de yerbas y rastreras. Las probabilidades anuales de sobrevivencia (Kaplan-Meier) para hembras (0.452 ± 0.118 DE) resultaron el doble, que lo estimado para los machos (0.210 ± 0.108), aunque estas diferencias no resultaron significativas. La tasa de mortalidad de correcaminos machos fue mayor que la de hembras durante la primavera, cuando los machos llaman desde perchas elevadas, cortejan a las hembras y persiguen a otros machos competidores. Las practicas agrícolas donde se eliminan áreas arbustivas para aumentar áreas de yerbas y rastreras, en aras de mejorar el forrajeo de ganado, pudiera ser detrimental para la población de correcaminos, al reducir la disponibilidad de matorral de mezquita y sabanas de mezquita, que es hábitat requerido para el anidamiento y pernoctación del ave." @default.
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- W1541143314 date "2011-05-24" @default.
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- W1541143314 title "Home range dynamics, habitat selection, and survival of Greater Roadrunners" @default.
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- W1541143314 doi "https://doi.org/10.1111/j.1557-9263.2011.00319.x" @default.
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