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• W1994400732 abstract "ABSTRACT The Himalayan Mountains have more specialist river birds than anywhere on earth, but factors permitting their coexistence have not been evaluated. We examined potential ecological segregation of five sympatric insectivores based on diet, morphology, and foraging behavior during the breeding and nonbreeding seasons in central Nepal. Little Forktails (Enicurus scouleri) and Brown Dippers (Cinclus pallasii) were highly aquatic in habitat use and diet (89–96% of prey of aquatic origin), but took prey that differed in size and composition. Spotted Forktails (E. maculatus) foraged primarily along channel margins, and took more aquatic than terrestrial prey (59% vs. 40%). White-capped (Chaimorrornis leucocephalus) and Plumbeous (Rhyacornis fuliginosus) water redstarts took primarily terrestrial or aerial prey by gleaning marginal surfaces and flycatching over channels. Two species were similar morphologically (Little Forktail and Plumbeous Water Redstart), but had different diets. Our results illustrate clear ecological separation among this guild of co-occurring river birds on one or more niche dimensions that we suggest is mediated by the physical complexity of mountain, riverine habitats. Las montañas Himalayas tienen mas aves especializadas en ríos que cualquier otro lugar del planeta, pero los factores que permiten su co-existencia no han sido evaluados. Examinamos la potencial de segregación ecológica de cinco especies insectívoras que viven en simpatria basado en su dieta, morfología y comportamiento de búsqueda de alimento. Enicurus scouleri y Cinclus pallasii usaron un hábitat y dieta altamente acuático (89–96% de las presas fueron de origen acuático), pero las presas capturadas fueron de distintos tamaños y taxa. E. maculatus buscó su alimento principalmente en las orillas de los canales y capturó mas presas acuáticas que terrestres (59 y 40%, respectivamente). Chaimorrornis leucocephalus y Rhyacornis fuliginosus capturaron principalmente presas terrestres o aéreas, mediante búsquedas sobre las superficies en áreas marginales y mediante vuelos cortos sobre los canales. Dos especies tuvieron una morfología similar (E. scouleri y R. fuliginosus), pero presentaron dietas diferentes. Aunque las causas evolutivas no son claras, nuestros resultados presentan una separación ecológica en una o mas dimensiones del nicho. Debido a que existen hábitats específicos de los ríos cuales son importantes en el uso de los recursos dentro y entre especies, nuestros datos proveen evidencia adicional que las modificaciones a lo largo del hábitat ribereño en las Himalayas pueden afectar a la distribución de las aves." @default.
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• W1994400732 date "2008-06-01" @default.
• W1994400732 modified "2023-09-26" @default.
• W1994400732 title "Niche segregation of Himalayan river birds" @default.
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• W1994400732 doi "https://doi.org/10.1111/j.1557-9263.2008.00160.x" @default.
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