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• W1520267730 abstract "Population declines among birds are often linked to habitat change and associated increases in nest pr?dation rates. In species of conservation concern identifying nest predators is an important first step in developing management strategies to mitigate low nesting success caused by depredation. Because predator composition varies geographically and with landscape factors habitat restoration may need to be tailored to reduce locally important predators. We used miniature video cameras to identify nest predators in a population of Florida Scrub-Jays (Aphelocoma coerulescens) significant to conservation. At 22 nests we observed 25 pr?dation events; 22 (88%) of these events were nocturnal. Yellow rat snakes (Elaphe obsoleta) had the highest daily pr?dation rate and accounted for 76% of egg and nestling losses. Florida Scrub-Jays are vulnerable to nocturnal nest pr?dation because their vigilance behavior is ineffective against nocturnal predators, breeders cannot defend against nocturnal predators, and brooding females are at risk of being killed by nocturnal predators. If current habitat restoration efforts do not reduce numbers of yellow rat snakes and improve scrub-jay nesting success, management actions to reduce populations of nocturnal snakes may need to be considered. SINOPSIS. Depredaci?n nocturna de nidos: un obst?culo potencial para la recuperaci?n de las poblaciones de Aphelocoma coerulescens La reducci?n en n?meros poblacionales de aves muchas veces ha sido ligada a cambios en el habitat y aumentos en las tasas de depredaci?n. En especies en donde hay preocupaci?n por su conservaci?n, el identificar los depredadores de nidos es un paso importante en el desarrollo de estrategias de manejo para mitigar el bajo ?xito de anidamiento causado por los depredadores. Dado el caso de que la composici?n de depredadores var?a geogr?ficamente y con factores asociados al paisaje, la restauraci?n del habitat tiene que ser ajustada a modo de reducir depredadores locales que causen gran impacto negativo. Utilizamos c?maras de video en miniatura para identificar los depredadores de nidos en una poblaci?n de Aphelocoma coerulescens. Observamos 25 episodios de depredaci?n (22 de ellos nocturnos) en 22 nidos estudiados. La culebra Elaphe obsoleta tuvo la tasa m?s afta de depredaci?n y fue la responsable del 76% de la p?rdida de huevos y pichones. Las aves estudiadas resultaron ser muy vulnerables a depredaci?n nocturna, dado el caso de que su vigilancia es inefectiva contra los depredadores nocturnos. Inclusive las hembras que calientan los pichones entran en riesgo de ser depredadas. Si la restauraci?n de habitat no reduce el n?mero de culebras y mejora el ?xito de anidamiento del ave estudiada, se deben considerar acciones de manejo dirigidas a reducir la poblaci?n de estas culebras." @default.
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• W1520267730 date "2007-12-07" @default.
• W1520267730 modified "2023-10-18" @default.
• W1520267730 title "Nocturnal nest predation: a potential obstacle to recovery of a Florida Scrub-Jay population" @default.
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• W1520267730 doi "https://doi.org/10.1111/j.1557-9263.2007.00127.x" @default.
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