Fragmentation effects are frequently a complex combination of predator abundance and behavior and landscape configuration. stelleri y el riesgo de depredación de nidos, es posible mapear este riesgo sobre el paisaje de interés a la escala de la unidad de manejo.ĭeclines in songbird populations resulting from decreased nest success are often linked to changes in configuration of natural land cover and increasing edge ( Paton 1994, Andrén 1995, Robinson et al. Considerando como equivalentes la abundancia relativa de C. stelleri, podría ser útil realizar censos de esta especie y sus alimentos. Para establecer el riesgo de depredación de nidos por parte de C. Estas aves no parecieron emplear una estrategia de búsqueda especializada para encontrar nidos, aunque tuvieron una imagen de búsqueda para nidos y fueron capaces de realizar búsquedas de otros ítems alimenticios (maní) en un área restringida. La depredación de nidos artificiales fue elevada en los sectores del área de hogar con alta frecuencia de uso, lo que sugiere que los córvidos encuentran los nidos incidentalmente mientras forrajean en busca de sus presas principales (insectos).
Esta especie se encontró en una variedad de estadíos sucesionales del bosque, el 95% de las observaciones de forrajeo tuvieron lugar a menos de 50 m de bordes y el área de hogar no pareció estar influenciada por el éxito reproductivo. Usando radiotelemetría y experimentos con nidos artificiales, estudiamos los movimientos y el comportamiento de depredación de nidos por parte del córvido Cyanocitta stelleri en los bosques manejados del oeste de Washington. Sin embargo, nuestro entendimiento actual de la mecánica de la depredación de nidos es limitado.
Los niveles reducidos de éxito de nidificación y los niveles altos de depredación de nidos han sido relacionados con cambios en la configuración del paisaje e incrementos en el área de bordes. ❾s la Depredación de Nidos por Cyanocitta stelleri Incidental o es el Resultado de una Estrategia de Búsqueda Especializada? By equating relative abundance of Steller's Jays with nest predation risk, managers can then map predation risk onto the landscape of concern at the scale of the management unit. To assess the risk of nest predation by Steller's Jays, it may be useful for managers to survey areas of concern for Steller's Jays and their foods. Steller's Jays did not appear to use a specialized search strategy to find nests, though they had a search image for nests and were capable of performing area-restricted searching for other food items (peanuts). Predation on artificial nests was elevated in high-use areas of home ranges, which suggests that Steller's Jays find nests incidentally while foraging for primary prey (insects). Steller's Jays used a variety of forest seral stages, 95% of foraging observations occurred within 50 m of edges, and home range did not appear to be influenced by breeding success. Using radiotelemetry and artificial nest experiments, we studied the ranging and nest-predation behavior of the Steller's Jay ( Cyanocitta stelleri) in the managed forests of western Washington. However, our current understanding of the mechanics of nest predation is limited. The National Institute of Environmental Health Sciences (NIEHS) is now hosting and maintaining the Resources for Alternatives to the Use of Live Vertebrates in Biomedical Research and Testing (ALTBIB).Decreased nest success and elevated levels of nest predation have been linked to changes in landscape configuration and increased edge.
#Specialized search update#
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