MigRatoRy connectiVity in the RuSty BlackBiRd: iSotopic eVidence fRoM featheRS of hiStoRical and conteMpoRaRy SpeciMenS
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reprintinfo.asp. doi: 10.1525/cond.2010.100146 Resumen. las poblaciones de Euphagus carolinus han disminuido dramáticamente en toda su distribución en américa del norte al menos desde la década de los sesenta, pero las causas de esta disminución se desconocen. Medimos los cocientes de isótopos estables de hidrógeno (δd) en plumas recolectadas entre 2005 y 2009 en el valle aluvial del Mississippi (n = 255 aves) y en las planicies costeras de carolina del Sur y Virginia (n = 281 aves) para estimar la región de origen de las aves que pasaban el invierno al oeste y al este de las apalaches, respectivamente. también medimos los valores de δd en plumas de todos los especímenes coleccionados en esas dos regiones entre 1879 y 1990 que estaban disponibles (n = 190 aves). los valores isotópicos demuestran conectividad migratoria en esta especie: las poblaciones que se reproducen en el oeste y en bosques boreales centrales migran a lo largo de un corredor central o del Mississippi, mientras que las que se reproducen en los bosques boreales del este migran a un área de invernada al este de los apalaches. Sin embargo, encontramos variabilidad temporal de corto plazo en el origen reproductivo de las aves que pasaron el invierno en las planicies costeras entre 2007 y 2009. la división entre dos rutas migratorias sugiere que los esfuerzos de manejo deben ajustarse al menos para las subpoblaciones del este y del oeste tanto en las áreas de cría como en las de invernada. nuestro enfoque puede aplicarse a un rango amplio de especies migratorias en américa del norte y en otros continentes. MigRatoRy connectiVity in the RuSty BlackBiRd: iSotopic eVidence fRoM featheRS of hiStoRical and conteMpoRaRy SpeciMenS
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Special Section: Rangewide Ecology of the Declining Rusty Blackbird Rusty Blackbird: Mysteries of a Species in Decline
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