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Behavioral and morphological evidence of an Allen's × Rufous hummingbird (Selasphorus sasin × S. rufus) hybrid zone in southern Oregon and northern California
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Behavioral and morphological evidence of an Allen's × Rufous hummingbird (Selasphorus sasin × S. rufus) hybrid zone in southern Oregon and northern California
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Behavioral and morphological evidence of an Allen's × Rufous hummingbird (Selasphorus sasin × S. rufus) hybrid zone in southern Oregon and northern California
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Journal Article
Behavioral and morphological evidence of an Allen's × Rufous hummingbird (Selasphorus sasin × S. rufus) hybrid zone in southern Oregon and northern California
2019
Overview
Allen's (Selasphorus sasin) and Rufous (S. rufus) hummingbird have long been suspected to hybridize, and potentially form a hybrid zone where their ranges overlap in southern Oregon. Migratory Allen's Hummingbird (S. s. sasin) breeds along a narrow strip of the California coast up to the Oregon border, while Rufous Hummingbird breeds from southern Oregon to Alaska. Analysis of behavioral and morphological data for 183 males and morphological data from 138 females showed that Allen's and Rufous hummingbird form a hybrid zone in southern Oregon and northern California. Linear discriminant function analysis and cline analysis of 20 phenotypic characters for males and 9 phenotypic characters for females suggested the center of the coastal transect of this north–south hybrid zone spanned from Bandon, Oregon (Coos County), to Port Orford, Oregon (Curry County). The contact zone extended north into the breeding range of Rufous (into Florence, Lane County, Oregon) and south into the range of Allen's (into Arcata, Humboldt County, California). Sporadic inland sampling suggested the hybrid zone extended at least 94 km inland from the coast. Behavioral data included courtship displays, which were composed of discrete, modular, behavioral elements. Sexual selection acted on these courtship displays, as behavioral clines related to courtship behaviors were more narrow than morphological clines. Some of the courtship behaviors analyzed included previously undescribed diagnostic behavioral characters for Allen's and Rufous hummingbird. Durante mucho tiempo se ha sospechado que Selasphorus sasin y S. rufus se hibridan y que forman potencialmente una zona híbrida en el sur de Oregón donde sus rangos se superponen. La subespecie migratoria S. s. sasin cría a lo largo de una estrecha franja de la costa de California hasta el límite con Oregón, mientras que S. rufus cría desde el sur de Oregón hasta Alaska. El análisis de datos de comportamiento y morfológicos de 183 machos y datos morfológicos de 138 hembras muestran que S. sasin y S. rufus forman una zona híbrida en el sur de Oregón y el norte de California. Un análisis de función discriminante lineal y un análisis de clina de 20 caracteres fenotípicos para los machos y nueve caracteres fenotípicos para las hembras sugirieron que el centro de la transecta costera de esta zona híbrida norte-sur abarcó desde Bandon, Oregón (Condado de Coos), hasta Port Orford, Oregón (Condado de Curry). La zona de contacto se extendió al norte hacia el rango reproductivo de S. rufus (en Florence, Condado de Lane, Oregón), y al sur hacia el rango de S. sasin (en Arcata, Condado de Humboldt, CA). El muestreo esporádico tierra adentro sugirió que la zona híbrida se extendió al menos 94 km tierra adentro desde la costa. Los datos de comportamiento incluyeron despliegues de cortejo que estuvieron compuestos por elementos conductuales discretos y modulares. La selección sexual actuó en estos despliegues de cortejo, ya que las clinas de comportamiento relacionadas a las conductas de cortejo fueron más estrechas que las clinas morfológicas. Algunas de las conductas de cortejo analizadas incluyeron caracteres diagnósticos de comportamiento anteriormente no descriptos para S. sasin y S. rufus.
Publisher
University of California Press,Oxford University Press,American Ornithological Society
