STABLE ISOTOPE EVIDENCE LINKS BREEDING GEOGRAPHY AND MIGRATION TIMING IN WOOD WARBLERS (PARULIDAE).

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Bibliographic Details
Title:	STABLE ISOTOPE EVIDENCE LINKS BREEDING GEOGRAPHY AND MIGRATION TIMING IN WOOD WARBLERS (PARULIDAE).
Alternate Title:	Evidencia de Isótopos Estables Conecta la Geografía de Nidficación con el Momento de la Migración en Especies de Parulidae.
Authors:	Kelly, Jeffrey F.
Source:	Auk (American Ornithologists Union). Apr2006, Vol. 123 Issue 2, p431-437. 7p.
Subjects:	Hydrogen isotopes, Feathers, Wood warblers, Bird migration, Songbirds, Animal migration, Animal behavior
Abstract (English):	Tracking seasonal movements of songbirds is a key step in understanding the annual cycle of migrants. To better understand autumn migration of wood warblers, I analyzed stable-hydrogen isotope ratios of feathers collected from three species captured during stopover at the Bosque del Apache National Wildlife Refuge, New Mexico. To assess the form and strength of the relationship between timing of migration and breeding origins, I regressed stable-hydrogen isotope ratios of feathers against date of capture. These analyses indicated that Orange-crowned Warblers (Vermivora celata) and Common Yellowthroats (Geothlypis trichas) breeding in the southern portion of these species' ranges precede their northern conspecifics in autumn migration. By contrast, Yellow Warblers (Dendroica petechia) from northern breeding sites arrived before more southerly breeding conspecifics. This pattern is similar to that reported previously in Wilson's Warbler (Wilsonia pusilla). These findings suggest that, among wood warblers, (1) timing of autumn migration is often strongly related to breeding location and (2) interspecific variation in the direction of this relationship is large. The direction and strength of these patterns have implications for our understanding of inter- and intraspecific geographic variation in the life histories of migrants. [ABSTRACT FROM AUTHOR]
Abstract (Spanish):	Realizar seguimientos de los movimientos estacionales de las aves canoras es un paso clave para entender el ciclo anual de las aves migratorias. Para entender mejor la migración de otoñ;o de las reinitas (Parulidae), analicé las proporciones de isótopos estables de hidrógeno en plumas de tres especies que fueron obtenidas de aves capturadas en Bosque del Apache National Wildlife Refuge, New Mexico. Para establecer la forma y la fuerza de la relación entre el momento en que las aves migran y sus áreas reproductivas de origen, realicé una regresión entre las proporciones de isótopos estables de hidrógeno presentes en las plumas y la fecha de captura. Estos análisis indicaron que los individuos de las especies Vermivora celata y Geothlypis trichas que se reproducen en la parte sur de las distribuciones de estas especies migran antes que los individuos coespecíficos de la parte norte. En contraste, los individuos de la especie Dendroica petechia provenientes de sitios de cría ubicados al norte arribaron antes que los individuos provenientes de sitios de cría ubicados al sur. Este patrón es similar al documentado previamente para Wilsonia pusilla. Estos hallazgos sugieren que, en las reinitas, el momento en que las aves migran está frecuentemente asociado fuertemente con las áreas de cría y que la variación interespecífica en la dirección de esta relación es amplia. La dirección y la fuerza de estos patrones tienen implicaciones para nuestro entendimiento de los patrones de variación geográfica inter- e intraespecífica en las historias de vida de las aves migratorias. [ABSTRACT FROM AUTHOR]
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Database:	Psychology and Behavioral Sciences Collection

Description
Abstract:	Tracking seasonal movements of songbirds is a key step in understanding the annual cycle of migrants. To better understand autumn migration of wood warblers, I analyzed stable-hydrogen isotope ratios of feathers collected from three species captured during stopover at the Bosque del Apache National Wildlife Refuge, New Mexico. To assess the form and strength of the relationship between timing of migration and breeding origins, I regressed stable-hydrogen isotope ratios of feathers against date of capture. These analyses indicated that Orange-crowned Warblers (Vermivora celata) and Common Yellowthroats (Geothlypis trichas) breeding in the southern portion of these species' ranges precede their northern conspecifics in autumn migration. By contrast, Yellow Warblers (Dendroica petechia) from northern breeding sites arrived before more southerly breeding conspecifics. This pattern is similar to that reported previously in Wilson's Warbler (Wilsonia pusilla). These findings suggest that, among wood warblers, (1) timing of autumn migration is often strongly related to breeding location and (2) interspecific variation in the direction of this relationship is large. The direction and strength of these patterns have implications for our understanding of inter- and intraspecific geographic variation in the life histories of migrants. [ABSTRACT FROM AUTHOR]
ISSN:	00048038
DOI:	10.1642/0004-8038(2006)123[431:SIELBG]2.0.CO;2